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    1,602 Products

    Nylon-Insert Locknuts

    Versatile yet economical, these are the most commonly used locknuts. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.
    High-Strength Steel
    Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.
    Rated Grade 8, Grade C, or Class 10, these locknuts are about 25% stronger than medium-strength steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.
    Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.
    Black-Corrosion-Resistant-Coated Steel—These nuts combine a finished appearance with the rust resistance of stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.
    Steel—Best for dry environments since moisture will cause these nuts to rust.
    Thread Size
    Wd.
    Ht.
    Fastener Strength
    Grade/Class
    Insert Max.
    Temp., ° F
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    1/4"-20
    7/16"5/16"SAE Grade 8
    1852597135A21000000
    1/4"-28
    7/16"5/16"SAE Grade 8
    1852597135A2150000
    5/16"-18
    1/2"11/32"SAE Grade 8
    1852097135A2200000
    5/16"-24
    1/2"11/32"SAE Grade 8
    1852097135A2250000
    3/8"-16
    9/16"29/64"SAE Grade 8
    1852097135A2300000
    3/8"-24
    9/16"29/64"SAE Grade 8
    1852097135A2350000
    7/16"-14
    5/8"29/64"SAE Grade 8
    1851097135A2400000
    7/16"-20
    5/8"29/64"SAE Grade 8
    1851097135A2450000
    1/2"-13
    3/4"19/32"SAE Grade 8
    1851097135A2500000
    1/2"-20
    3/4"19/32"SAE Grade 8
    1851097135A2550000
    9/16"-12
    7/8"41/64"SAE Grade 8
    185597135A2600000
    9/16"-18
    7/8"41/64"SAE Grade 8
    185597135A2650000
    5/8"-11
    15/16"3/4"SAE Grade 8
    185597135A2700000
    5/8"-18
    15/16"3/4"SAE Grade 8
    185597135A2750000
    3/4"-10
    1 1/16"7/8"SAE Grade 8
    185597135A2800000
    3/4"-16
    1 1/16"7/8"SAE Grade 8
    185597135A2850000
    7/8"-9
    1 1/4"63/64"SAE Grade 8
    185197135A2900000
    7/8"-14
    1 1/4"63/64"SAE Grade 8
    185197135A2950000
    1"-8
    1 7/16"1 3/64"SAE Grade 8
    185197135A0380000
    1"-12
    1 7/16"1 3/64"SAE Grade 8
    185597135A40100000
    1"-14
    1 7/16"1 3/64"SAE Grade 8
    185197135A0590000
    1 1/8"-7
    1 5/8"1 11/64"SAE Grade 8
    185197135A35000000
    1 1/8"-12
    1 5/8"1 11/64"SAE Grade 8
    185197135A11200000
    1 1/4"-7
    1 13/16"1 25/64"SAE Grade 8
    185197135A35500000
    1 1/4"-8
    2 1/64"1 41/64"SAE Grade 8
    185197135A40400000
    1 1/4"-12
    1 13/16"1 25/64"SAE Grade 8
    185197135A11300000
    1 1/2"-6
    2 13/64"1 39/64"SAE Grade 8
    185197135A36000000
    1 1/2"-8
    2 25/64"1 59/64"SAE Grade 8
    185197135A40700000
    1 1/2"-12
    2 13/64"1 39/64"SAE Grade 8
    185197135A11400000
    1 3/4"-5
    2 49/64"2 5/16"SAE Grade 8
    185197135A40800000
    1 3/4"-8
    2 49/64"2 5/16"SAE Grade 8
    185197135A41100000
    1 3/4"-12
    2 49/64"2 5/16"SAE Grade 8
    185197135A40900000
    2"-4 1/2
    3 9/64"2 13/32"SAE Grade 8
    185197135A11500000
    2"-12
    3 9/64"2 13/32"SAE Grade 8
    185197135A11600000
    2 1/4"-8
    3 33/64"2 13/16"SAE Grade 8
    185197135A41300000
     
    Zinc-Plated Steel
    M4 × 0.7 mm7 mm5 mmClass 10
    185DIN 98510094645A10100000
    M5 × 0.8 mm8 mm5 mmClass 10
    185DIN 98510094645A10200000
    M6 × 1 mm10 mm6 mmClass 10
    185DIN 98510094645A20500000
    M8 × 1 mm13 mm8 mmClass 10
    185DIN 985, ISO 105111094645A11100000
    M8 × 1.25 mm13 mm8 mmClass 10
    185DIN 9855094645A21000000
    M10 × 1 mm17 mm10 mmClass 10
    185DIN 985, ISO 105112594645A2130000
    M10 × 1.25 mm17 mm10 mmClass 10
    185DIN 985, ISO 105111094645A11200000
    M10 × 1.5 mm17 mm10 mmClass 10
    185DIN 9852594645A22000000
    M12 × 1.25 mm19 mm12 mmClass 10
    185DIN 985, ISO 105111094645A11300000
    M12 × 1.5 mm19 mm12 mmClass 10
    185DIN 985, ISO 105111094645A2290000
    M12 × 1.75 mm19 mm12 mmClass 10
    185DIN 9851094645A23000000
    M14 × 1.5 mm22 mm14 mmClass 10
    185DIN 985, ISO 10511594645A11500000
    M14 × 2 mm22 mm14 mmClass 10
    185DIN 9851094645A24000000
    M16 × 1.5 mm24 mm16 mmClass 10
    185DIN 985, ISO 10511194645A1160000
    M16 × 2 mm24 mm16 mmClass 10
    185DIN 9851094645A25000000
    M18 × 1.5 mm27 mm18 mmClass 10
    185DIN 985, ISO 10511194645A1170000
    M18 × 2.5 mm27 mm18.5 mmClass 10
    185DIN 985594645A26000000
    M20 × 1.5 mm30 mm20 mmClass 10
    185DIN 985, ISO 10511194645A1180000
    M20 × 2 mm30 mm20 mmClass 10
    185DIN 985, ISO 10511194645A11900000
    M20 × 2.5 mm30 mm20 mmClass 10
    185DIN 985594645A27000000
    M22 × 1.5 mm32 mm22 mmClass 10
    185DIN 985, ISO 10511194645A12100000
    M22 × 2.5 mm32 mm22 mmClass 10
    185DIN 985194645A3100000
    M24 × 1.5 mm36 mm24 mmClass 10
    185DIN 985, ISO 10511194645A12200000
    M24 × 2 mm36 mm24 mmClass 10
    185DIN 985, ISO 10511194645A12300000
    M24 × 3 mm36 mm24 mmClass 10
    185DIN 985194645A2800000
    M27 × 3 mm41 mm27 mmClass 10
    185DIN 985194645A32000000
    M30 × 2 mm46 mm30 mmClass 10
    185DIN 985, ISO 10511194645A12400000
    M30 × 3.5 mm46 mm30 mmClass 10
    185DIN 985194645A33000000
    M33 × 3.5 mm50 mm33 mmClass 10
    185DIN 985194645A34000000
    M36 × 3 mm55 mm36 mmClass 10
    185DIN 985, ISO 10511194645A12500000
    M36 × 4 mm55 mm36 mmClass 10
    185DIN 985194645A35000000
    M39 × 4 mm60 mm39 mmClass 10
    185DIN 985194645A36000000
    M42 × 4.5 mm65 mm42 mmClass 10
    185DIN 985194645A37000000
     
    Black-Oxide Steel
    1/4"-20
    7/16"5/16"SAE Grade 8
    1852597135A4140000
    1/4"-28
    7/16"5/16"SAE Grade 8
    1852597135A4150000
    5/16"-18
    1/2"11/32"SAE Grade 8
    1852097135A4160000
    5/16"-24
    1/2"11/32"SAE Grade 8
    1852097135A4170000
    3/8"-16
    9/16"29/64"SAE Grade 8
    1852097135A4180000
    3/8"-24
    9/16"29/64"SAE Grade 8
    1852097135A4190000
    7/16"-14
    5/8"29/64"SAE Grade 8
    1851097135A4210000
    7/16"-20
    5/8"29/64"SAE Grade 8
    1851097135A4220000
    1/2"-13
    3/4"19/32"SAE Grade 8
    1851097135A4230000
    1/2"-20
    3/4"19/32"SAE Grade 8
    1851097135A4240000
    9/16"-12
    7/8"41/64"SAE Grade 8
    185597135A4250000
    9/16"-18
    7/8"41/64"SAE Grade 8
    185597135A4260000
    5/8"-11
    15/16"3/4"SAE Grade 8
    185597135A4270000
    5/8"-18
    15/16"3/4"SAE Grade 8
    185597135A4280000
    3/4"-10
    1 1/16"7/8"SAE Grade 8
    185597135A4290000
    3/4"-16
    1 1/16"7/8"SAE Grade 8
    185597135A4310000
    7/8"-9
    1 1/4"63/64"SAE Grade 8
    185197135A4320000
    7/8"-14
    1 1/4"63/64"SAE Grade 8
    185197135A4330000
    1"-8
    1 7/16"1 3/64"SAE Grade 8
    185197135A4340000
    1"-14
    1 7/16"1 3/64"SAE Grade 8
    185197135A4350000
    1 1/8"-7
    1 5/8"1 11/64"SAE Grade 8
    185197135A43600000
    1 1/8"-12
    1 5/8"1 11/64"SAE Grade 8
    185197135A43700000
    1 1/4"-7
    1 13/16"1 25/64"SAE Grade 8
    185197135A43800000
    1 1/4"-12
    1 13/16"1 25/64"SAE Grade 8
    185197135A43900000
    1 1/2"-6
    2 13/64"1 39/64"SAE Grade 8
    185197135A44100000
    1 1/2"-8
    2 25/64"1 59/64"SAE Grade 8
    185197135A44800000
    1 1/2"-12
    2 13/64"1 39/64"SAE Grade 8
    185197135A44200000
    1 3/4"-5
    2 49/64"2 5/16"SAE Grade 8
    185197135A44900000
    1 3/4"-12
    2 49/64"2 5/16"SAE Grade 8
    185197135A45100000
    2"-8
    3 9/64"2 13/32"SAE Grade 8
    185197135A45400000
    2"-12
    3 9/64"2 13/32"SAE Grade 8
    185197135A45300000
     
    Black-Corrosion-Resistant-Coated Steel
    M4 × 0.7 mm7 mm5 mmClass 10
    185DIN 985590237A11000000
    M5 × 0.8 mm8 mm5 mmClass 10
    185DIN 985590237A12000000
    M6 × 1 mm10 mm6 mmClass 10
    185DIN 985590237A13000000
    M8 × 1.25 mm13 mm8 mmClass 10
    185DIN 985590237A14000000
    M10 × 1.5 mm17 mm10 mmClass 10
    185DIN 985590237A15000000
    M12 × 1.75 mm19 mm12 mmClass 10
    185DIN 985190237A1600000
    M14 × 2 mm22 mm14 mmClass 10
    185DIN 985190237A1700000
     
    Steel
    1/4"-20
    7/16"5/16"SAE Grade 8
    1852590630A1100000
    1/4"-28
    7/16"5/16"SAE Grade 8
    1852590630A1450000
    5/16"-18
    1/2"11/32"SAE Grade 8
    1852090630A1150000
    5/16"-24
    1/2"11/32"SAE Grade 8
    1852090630A1500000
    3/8"-16
    9/16"29/64"SAE Grade 8
    1852090630A1210000
    3/8"-24
    9/16"29/64"SAE Grade 8
    1852090630A1550000
    7/16"-14
    5/8"29/64"SAE Grade 8
    1852590630A11200000
    7/16"-20
    5/8"29/64"SAE Grade 8
    1852590630A11300000
    1/2"-13
    3/4"19/32"SAE Grade 8
    1851090630A1250000
    1/2"-20
    3/4"19/32"SAE Grade 8
    1851090630A1600000
    9/16"-12
    7/8"41/64"SAE Grade 8
    185590630A2010000
    9/16"-18
    7/8"41/64"SAE Grade 8
    185590630A2020000
    5/8"-11
    15/16"3/4"SAE Grade 8
    185590630A1300000
    5/8"-18
    15/16"3/4"SAE Grade 8
    185590630A1650000
    3/4"-10
    1 1/16"7/8"SAE Grade 8
    185590630A1350000
    3/4"-16
    1 1/16"7/8"SAE Grade 8
    185590630A1700000
    7/8"-9
    1 1/4"63/64"SAE Grade 8
    185190630A1140000
    7/8"-14
    1 1/4"63/64"SAE Grade 8
    185190630A1160000
    1"-8
    1 7/16"1 3/64"SAE Grade 8
    185190630A1400000
    1"-14
    1 7/16"1 3/64"SAE Grade 8
    185190630A1750000
    1 1/8"-7
    1 5/8"1 11/64"SAE Grade 8
    185190630A20300000
    1 1/8"-12
    1 5/8"1 11/64"SAE Grade 8
    185190630A20400000
    1 1/4"-7
    2 1/64"1 41/64"SAE Grade 8
    185190630A20900000
    1 1/4"-8
    2 1/64"1 41/64"SAE Grade 8
    185190630A21100000
    1 1/4"-12
    1 13/16"1 25/64"SAE Grade 8
    185190630A20500000
    1 3/8"-8
    2 3/16"1 51/64"SAE Grade 8
    185190630A21200000
    1 1/2"-6
    2 3/16"1 39/64"SAE Grade 8
    185190630A20600000
    1 1/2"-8
    2 25/64"1 59/64"SAE Grade 8
    185190630A21400000
    1 1/2"-12
    2 13/64"1 39/64"SAE Grade 8
    185190630A20700000
    1 3/4"-5
    2 49/64"2 5/16"SAE Grade 8
    185190630A21500000
    1 3/4"-8
    2 49/64"2 5/16"SAE Grade 8
    185190630A21700000
    1 3/4"-12
    2 49/64"2 5/16"SAE Grade 8
    185190630A21600000
    2"-8
    3 9/64"2 13/32"SAE Grade 8
    185190630A21900000
    2"-12
    3 9/64"2 13/32"SAE Grade 8
    185190630A21800000
    2 1/4"-8
    3 33/64"2 13/16"SAE Grade 8
    185190630A22100000
     
    Medium-Strength Steel
    Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.
    These Grade 5 or Class 8 nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't hold up to the harsh chemicals that stainless steel can.
    Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.
    Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.
    Black-Corrosion-Resistant-Coated Steel—These nuts combine a finished appearance with the rust resistance of stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.
    Thread Size
    Wd.
    Ht.
    Fastener Strength
    Grade/Class
    Insert Max.
    Temp., ° F
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Zinc-Yellow-Chromate-Plated Steel
    M3 × 0.5 mm5.5 mm4 mmClass 8
    185DIN 985, ISO 1051110090576A811000000
    M4 × 0.7 mm7 mm5 mmClass 8
    185DIN 985, ISO 1051110090576A81200000
    M5 × 0.8 mm8 mm5 mmClass 8
    185DIN 985, ISO 1051110090576A81300000
    M6 × 1 mm10 mm6 mmClass 8
    185DIN 985, ISO 1051110090576A81400000
    M8 × 1.25 mm13 mm8 mmClass 8
    185DIN 985, ISO 1051110090576A81500000
    M10 × 1.5 mm17 mm10 mmClass 8
    185DIN 985, ISO 105115090576A81600000
    M12 × 1.75 mm19 mm12 mmClass 8
    185DIN 985, ISO 105112590576A81700000
    M14 × 2 mm22 mm14 mmClass 8
    185DIN 985, ISO 105112590576A81800000
    M16 × 2 mm24 mm16 mmClass 8
    185DIN 985, ISO 105111090576A8190000
    M18 × 2.5 mm27 mm18.5 mmClass 8
    185DIN 985, ISO 10511590576A8210000
    M20 × 2.5 mm30 mm20 mmClass 8
    185DIN 985, ISO 10511590576A8220000
    M22 × 2.5 mm32 mm22 mmClass 8
    185DIN 985, ISO 10511590576A82300000
    M24 × 3 mm36 mm24 mmClass 8
    185DIN 985, ISO 10511590576A82400000
     
    Zinc-Plated Steel
    1/4"-20
    7/16"5/16"SAE Grade 5
    18510095615A1200000
    1/4"-28
    7/16"5/16"SAE Grade 5
    18510095615A1300000
    5/16"-18
    1/2"11/32"SAE Grade 5
    18510095615A16000000
    5/16"-24
    1/2"11/32"SAE Grade 5
    18510095615A17000000
    3/8"-16
    9/16"29/64"SAE Grade 5
    18510095615A14000000
    3/8"-24
    9/16"29/64"SAE Grade 5
    18510095615A15000000
    7/16"-14
    5/8"29/64"SAE Grade 5
    18510095615A18000000
    7/16"-20
    5/8"29/64"SAE Grade 5
    18510095615A19000000
    1/2"-13
    3/4"19/32"SAE Grade 5
    1855095615A21000000
    1/2"-20
    3/4"19/32"SAE Grade 5
    1855095615A22000000
    9/16"-12
    7/8"41/64"SAE Grade 5
    1852595615A23000000
    9/16"-18
    7/8"41/64"SAE Grade 5
    1852595615A24000000
    5/8"-11
    15/16"3/4"SAE Grade 5
    1852595615A25000000
    5/8"-18
    15/16"3/4"SAE Grade 5
    1852595615A26000000
    3/4"-10
    1 1/16"7/8"SAE Grade 5
    1851095615A2700000
    3/4"-16
    1 1/16"7/8"SAE Grade 5
    1851095615A2800000
    7/8"-9
    1 1/4"63/64"SAE Grade 5
    185595615A2900000
    7/8"-14
    1 1/4"63/64"SAE Grade 5
    185595615A31000000
    1"-8
    1 7/16"1 3/64"SAE Grade 5
    185595615A32000000
    1"-14
    1 7/16"1 3/64"SAE Grade 5
    185595615A33000000
    1 1/8"-7
    1 5/8"1 11/64"SAE Grade 5
    185595615A34100000
    1 1/4"-7
    1 13/16"1 25/64"SAE Grade 5
    185195615A35000000
    1 1/2"-6
    2 13/64"1 39/64"SAE Grade 5
    185190640A42000000
    M2 × 0.4 mm4 mm2.8 mmClass 8
    185DIN 9851090576A2110000
    M2.5 × 0.45 mm5 mm3.8 mmClass 8
    185DIN 9855090576A1610000
    M3 × 0.5 mm5.5 mm4 mmClass 8
    185DIN 985, ISO 1051110090576A1020000
    M4 × 0.7 mm7 mm5 mmClass 8
    185DIN 985, ISO 1051110090576A1030000
    M5 × 0.8 mm8 mm5 mmClass 8
    185DIN 985, ISO 1051110090576A1040000
    M6 × 1 mm10 mm6 mmClass 8
    185DIN 985, ISO 1051110090576A1150000
    M7 × 1 mm11 mm7.5 mmClass 8
    185DIN 985, ISO 105112590576A2120000
    M8 × 1 mm13 mm8 mmClass 8
    185DIN 985, ISO 105112590576A1160000
    M8 × 1.25 mm13 mm8 mmClass 8
    185DIN 985, ISO 1051110090576A11700000
    M10 × 1 mm17 mm10 mmClass 8
    185DIN 985, ISO 105112590576A1310000
    M10 × 1.25 mm17 mm10 mmClass 8
    185DIN 985, ISO 105112590576A13200000
    M10 × 1.5 mm17 mm10 mmClass 8
    185DIN 985, ISO 105115090576A1180000
    M12 × 1 mm19 mm12 mmClass 8
    185DIN 985, ISO 105111090576A1370000
    M12 × 1.25 mm19 mm12 mmClass 8
    185DIN 985, ISO 105112590576A14100000
    M12 × 1.5 mm19 mm12 mmClass 8
    185DIN 985, ISO 105112090576A14400000
    M12 × 1.75 mm19 mm12 mmClass 8
    185DIN 9855090576A11900000
    M14 × 1.5 mm22 mm14 mmClass 8
    185DIN 985, ISO 105111090576A1470000
    M14 × 2 mm22 mm14 mmClass 8
    185DIN 985, ISO 105112590576A12000000
    M16 × 1.5 mm24 mm16 mmClass 8
    185DIN 985, ISO 105111090576A15200000
    M16 × 2 mm24 mm16 mmClass 8
    185DIN 9852590576A12200000
    M18 × 1.5 mm27 mm18.5 mmClass 8
    185DIN 985, ISO 105111090576A10600000
    M18 × 2.5 mm27 mm18.5 mmClass 8
    185DIN 985, ISO 105111090576A12300000
    M20 × 1.5 mm30 mm20 mmClass 8
    185DIN 985, ISO 10511590576A17200000
    M20 × 2 mm30 mm20 mmClass 8
    185DIN 985, ISO 10511190576A1550000
    M20 × 2.5 mm30 mm20 mmClass 8
    185DIN 985, ISO 105111090576A12500000
    M22 × 1.5 mm32 mm22 mmClass 8
    185DIN 985, ISO 10511590576A29900000
    M22 × 2.5 mm32 mm22 mmClass 8
    185DIN 985, ISO 10511590576A16200000
    M24 × 1.5 mm36 mm24 mmClass 8
    185DIN 985, ISO 10511190576A3260000
    M24 × 2 mm36 mm24 mmClass 8
    185DIN 985, ISO 10511190576A3040000
    M24 × 3 mm36 mm24 mmClass 8
    185DIN 985, ISO 10511590576A12900000
    M27 × 1.5 mm41 mm27 mmClass 8
    185DIN 985, ISO 10511190576A3520000
    M27 × 2 mm41 mm27 mmClass 8
    185DIN 985, ISO 10511190576A3420000
    M27 × 3 mm41 mm27 mmClass 8
    185DIN 985, ISO 10511190576A1400000
    M30 × 2 mm46 mm30 mmClass 8
    185DIN 985, ISO 10511190576A36600000
    M30 × 3.5 mm46 mm30 mmClass 8
    185DIN 985, ISO 10511190576A1500000
    M33 × 2 mm50 mm33 mmClass 8
    185DIN 985, ISO 10511190576A38400000
    M33 × 3.5 mm50 mm33 mmClass 8
    185DIN 985, ISO 10511190576A16300000
    M36 × 3 mm55 mm36 mmClass 8
    185DIN 985, ISO 10511190576A45200000
    M36 × 4 mm55 mm36 mmClass 8
    185DIN 985, ISO 10511190576A16400000
    M39 × 3 mm60 mm39 mmClass 8
    185DIN 985, ISO 10511190576A52300000
    M42 × 3 mm65 mm42 mmClass 8
    185DIN 985, ISO 10511190576A53100000
    M45 × 3 mm70 mm45 mmClass 8
    185DIN 985, ISO 10511190576A54400000
    M48 × 3 mm75 mm48 mmClass 8
    185DIN 985, ISO 10511190576A72600000
    M48 × 5 mm75 mm48 mmClass 8
    185DIN 985, ISO 10511190576A16600000
     
    Black-Oxide Steel
    1/4"-20
    7/16"5/16"SAE Grade 5
    18510095615A1010000
    1/4"-28
    7/16"5/16"SAE Grade 5
    18510095615A10200000
    5/16"-18
    1/2"11/32"SAE Grade 5
    18510095615A10300000
    5/16"-24
    1/2"11/32"SAE Grade 5
    18510095615A10400000
    3/8"-16
    9/16"29/64"SAE Grade 5
    18510095615A10500000
    3/8"-24
    9/16"29/64"SAE Grade 5
    18510095615A10600000
    7/16"-14
    5/8"29/64"SAE Grade 5
    18510095615A10700000
    7/16"-20
    5/8"29/64"SAE Grade 5
    18510095615A10800000
    1/2"-13
    3/4"19/32"SAE Grade 5
    1855095615A10900000
    1/2"-20
    3/4"19/32"SAE Grade 5
    1855095615A11100000
    9/16"-12
    7/8"41/64"SAE Grade 5
    1852595615A11600000
    5/8"-11
    15/16"3/4"SAE Grade 5
    1852595615A11200000
    5/8"-18
    15/16"3/4"SAE Grade 5
    1852595615A11300000
    3/4"-10
    1 1/16"7/8"SAE Grade 5
    1851095615A11400000
    3/4"-16
    1 1/16"7/8"SAE Grade 5
    1851095615A11500000
    7/8"-9
    1 1/4"63/64"SAE Grade 5
    185595615A11700000
    1"-8
    1 7/16"1 3/64"SAE Grade 5
    185595615A11800000
     
    Black-Corrosion-Resistant-Coated Steel
    M4 × 0.7 mm7 mm5 mmClass 8
    185DIN 985, ISO 10511590819A11100000
    M5 × 0.8 mm8 mm5 mmClass 8
    185DIN 985, ISO 10511590819A11200000
    M6 × 1 mm10 mm6 mmClass 8
    185DIN 985, ISO 10511590819A11300000
    M8 × 1.25 mm13 mm8 mmClass 8
    185DIN 985, ISO 10511590819A11400000
    M10 × 1.5 mm17 mm10 mmClass 8
    185DIN 985, ISO 10511590819A11500000
    M12 × 1.75 mm19 mm12 mmClass 8
    185DIN 985, ISO 10511190819A1160000
    M14 × 2 mm22 mm14 mmClass 8
    185DIN 985, ISO 10511190819A1170000
     
    Low-Strength Steel
    Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.
    Rated Grade 2, Class 6, or lower, these locknuts are about half as strong as medium-strength steel nuts. Use them with screws that have a similar strength rating to avoid stripping threads during installation.
    Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.
    Black-Corrosion-Resistant-Coated Steel—These nuts combine a finished appearance with the rust resistance of stainless steel. The coating has been tested to extreme standards, including 1,000 hours of salt spray resistance, to hold up in wet and outdoor environments. Also known as black luster.
    Thread Size
    Wd.
    Ht.
    Insert Max.
    Temp., ° F
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    2-56
    1/4"9/64"18510090631A00300000
    3-48
    1/4"9/64"18510090631A0040000
    4-40
    1/4"9/64"18510090631A0050000
    5-40
    1/4"9/64"18510090631A0060000
    6-32
    5/16"11/64"18510090631A0070000
    8-32
    11/32"15/64"18510090631A0090000
    10-24
    3/8"15/64"18510090631A0110000
    10-32
    3/8"15/64"18510090631A4110000
    12-24
    7/16"5/16"18510090631A1200000
    1/4"-20
    7/16"5/16"18510090640A1290000
    1/4"-28
    7/16"5/16"18510090640A1400000
    5/16"-18
    1/2"11/32"18510090640A1300000
    5/16"-24
    1/2"11/32"18510090640A1450000
    3/8"-16
    9/16"29/64"18510090640A13100000
    3/8"-24
    9/16"29/64"18510090640A15000000
    7/16"-14
    5/8"29/64"18510090640A13200000
    7/16"-20
    5/8"29/64"18510090640A15500000
    1/2"-13
    3/4"19/32"1855090640A13300000
    1/2"-20
    3/4"19/32"1855090640A16000000
    9/16"-12
    7/8"41/64"1852590640A1340000
    9/16"-18
    7/8"41/64"1852590640A16500000
    5/8"-11
    15/16"3/4"1852590640A13500000
    5/8"-18
    15/16"3/4"1852590640A17000000
    3/4"-10
    1 1/16"7/8"1851090640A3200000
    3/4"-16
    1 1/16"7/8"1851090640A3300000
    7/8"-9
    1 1/4"63/64"185590640A3400000
    7/8"-14
    1 1/4"63/64"185590640A3500000
    1"-8
    1 7/16"1 3/64"185590640A36000000
    1"-14
    1 7/16"1 3/64"185590640A37000000
    1 1/8"-7
    1 5/8"1 11/64"185190640A4000000
    1 1/4"-7
    1 13/16"1 25/64"185190640A4100000
    M4 × 0.7 mm7 mm5 mm18510090631A1120000
    M5 × 0.8 mm8 mm5 mm18510090631A1130000
    M6 × 1 mm10 mm6 mm18510090631A1140000
    M8 × 1.25 mm13 mm8 mm18510090631A11500000
    M10 × 1.5 mm17 mm10 mm1855090631A11600000
    M12 × 1.75 mm19 mm12 mm1855090631A11700000
    M14 × 2 mm22 mm14 mm1852590631A11800000
    M16 × 2 mm24 mm16 mm1852590631A11900000
    M18 × 2.5 mm27 mm18.5 mm1851090631A12100000
    M20 × 2.5 mm30 mm22 mm1851090631A12200000
    M22 × 2.5 mm32 mm22 mm1851090631A12300000
    M24 × 3 mm36 mm24 mm185590631A12400000
    M27 × 3 mm41 mm27 mm185190631A1250000
    M30 × 3.5 mm46 mm30 mm185190631A1260000
     
    Black-Corrosion-Resistant-Coated Steel
    6-32
    5/16"11/64"185591333A1100000
    8-32
    11/32"15/64"185591333A1200000
    10-24
    3/8"15/64"185591333A1300000
    10-32
    3/8"15/64"185591333A1400000
    1/4"-20
    7/16"5/16"185591333A1500000
    5/16"-18
    1/2"11/32"185591333A1600000
    3/8"-16
    9/16"29/64"185591333A1700000
    1/2"-13
    3/4"19/32"185591333A18000000
     
    Corrosion-Resistant Stainless Steel
    Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.
    Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but won't hold up to the harsh chemicals that 316 stainless steel can.
    316 Stainless Steel—Our most corrosion-resistant nuts, these hold up in just about any environment. They won't degrade from exposure to weather, salt water, and most chemicals.
    Thread Size
    Wd.
    Ht.
    Insert Max.
    Temp., ° F
    Specs.
    Met
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    0-80
    7/64"1/16"1851091831A171000000
    2-56
    1/4"9/64"1855091831A0020000
    3-48
    1/4"9/64"1852591831A0040000
    3-56
    1/4"9/64"1852591831A1720000
    4-40
    1/4"9/64"18510091831A0050000
    4-48
    1/4"9/64"1852591831A1730000
    5-40
    1/4"9/64"18510091831A0060000
    6-32
    5/16"11/64"18510091831A0070000
    6-40
    5/16"11/64"18510091831A1220000
    8-32
    11/32"15/64"18510091831A0090000
    8-36
    11/32"15/64"18510091831A12300000
    10-24
    3/8"15/64"18510091831A0110000
    10-32
    3/8"15/64"18510091831A4110000
    12-24
    7/16"5/16"1855091831A0250000
    12-28
    7/16"5/16"1855091831A12400000
    1/4"-20
    7/16"5/16"1855091831A0290000
    1/4"-28
    7/16"5/16"1855091831A1200000
    5/16"-18
    1/2"11/32"1855091831A03000000
    5/16"-24
    1/2"11/32"1855091831A1250000
    3/8"-16
    9/16"29/64"1852591831A1270000
    3/8"-24
    9/16"29/64"1852591831A1300000
    7/16"-14
    5/8"29/64"1852591831A1330000
    7/16"-20
    5/8"29/64"1852591831A13500000
    1/2"-13
    3/4"19/32"1851091831A1370000
    1/2"-20
    3/4"19/32"1851091831A1400000
    9/16"-12
    7/8"41/64"185191831A0340000
    9/16"-18
    7/8"41/64"185191831A1430000
    5/8"-11
    15/16"3/4"185591831A1440000
    5/8"-18
    15/16"3/4"185591831A1450000
    3/4"-10
    1 1/16"7/8"185591831A14700000
    3/4"-16
    1 1/16"7/8"185191831A1500000
    7/8"-9
    1 1/4"63/64"185191831A0370000
    7/8"-14
    1 1/4"63/64"185191831A1550000
    1"-8
    1 7/16"1 3/64"185191831A0380000
    1"-12
    1 7/16"1 3/64"185191831A12100000
    1"-14
    1 7/16"1 3/64"185191831A1600000
    1 1/8"-7
    1 5/8"1 11/64"185191831A03900000
    1 1/4"-7
    1 13/16"1 25/64"185191831A04000000
    1 3/8"-6
    2"1 37/64"185191831A17400000
    1 1/2"-6
    2 13/64"1 39/64"185191831A04100000
    M2 × 0.4 mm4 mm2.8 mm185DIN 9851093625A10100000
    M2.5 × 0.45 mm5 mm3.8 mm185DIN 9852593625A1030000
    M3 × 0.5 mm5.5 mm4 mm185DIN 98510093625A1000000
    M4 × 0.7 mm7 mm5 mm185DIN 98510093625A1500000
    M5 × 0.8 mm8 mm5 mm185DIN 98510093625A2000000
    M6 × 1 mm10 mm6 mm185DIN 98510093625A25000000
    M8 × 1 mm13 mm8 mm185DIN 985593625A11000000
    M8 × 1.25 mm13 mm8 mm185DIN 9855093625A30000000
    M10 × 1 mm17 mm10 mm185DIN 985593625A12000000
    M10 × 1.5 mm17 mm10 mm185DIN 9851093625A3500000
    M12 × 1.5 mm19 mm12 mm185DIN 985193625A1300000
    M12 × 1.75 mm19 mm12 mm185DIN 9851093625A4000000
    M14 × 1.5 mm22 mm14 mm185DIN 985193625A1400000
    M14 × 2 mm22 mm14 mm185DIN 985593625A4500000
    M16 × 1.5 mm24 mm16 mm185DIN 985193625A16000000
    M16 × 2 mm24 mm16 mm185DIN 985593625A5000000
    M18 × 1.5 mm27 mm18 mm185DIN 985193625A17000000
    M18 × 2.5 mm27 mm18.5 mm185DIN 985193625A5100000
    M20 × 1.5 mm30 mm20 mm185DIN 985193625A18000000
    M20 × 2.5 mm30 mm20 mm185DIN 985193625A5500000
    M22 × 2.5 mm32 mm22 mm185DIN 985193625A7600000
    M24 × 3 mm36 mm24 mm185DIN 985193625A6000000
    M27 × 3 mm41 mm27 mm185DIN 985193625A70000000
    M30 × 3.5 mm46 mm30 mm185DIN 985193625A75000000
     
    Black-Oxide 18-8 Stainless Steel
    2-56
    1/4"9/64"1855094407A10800000
    3-48
    1/4"9/64"1852594407A10900000
    4-40
    1/4"9/64"18510094407A10000000
    5-40
    1/4"9/64"1852594407A1100000
    6-32
    5/16"11/64"18510094407A10100000
    6-40
    5/16"11/64"1852594407A11100000
    8-32
    11/32"15/64"18510094407A10200000
    8-36
    11/32"15/64"1852594407A11200000
    10-24
    3/8"15/64"18510094407A10300000
    10-32
    3/8"15/64"1852594407A1130000
    12-24
    7/16"5/16"1852594407A11400000
    1/4"-20
    7/16"5/16"1855094407A10400000
    1/4"-28
    7/16"5/16"1851094407A1160000
    5/16"-18
    1/2"11/32"1855094407A10500000
    5/16"-24
    1/2"11/32"1851094407A11700000
    3/8"-16
    9/16"29/64"1852594407A10600000
    3/8"-24
    9/16"29/64"1851094407A11800000
    7/16"-14
    5/8"29/64"1851094407A11900000
    7/16"-20
    5/8"29/64"185594407A12000000
    1/2"-13
    3/4"19/32"1851094407A10700000
    1/2"-20
    3/4"19/32"185594407A12100000
    5/8"-11
    15/16"3/4"185194407A1240000
    3/4"-10
    1 1/16"7/8"185194407A1250000
    M2 × 0.4 mm4 mm3 mm185DIN 985593625A2210000
    M2.5 × 0.45 mm5 mm3.8 mm185DIN 9851093625A2220000
    M3 × 0.5 mm5.5 mm4 mm185DIN 9851093625A2230000
    M4 × 0.7 mm7 mm5 mm185DIN 9851093625A2240000
    M5 × 0.8 mm8 mm5 mm185DIN 9851093625A2250000
    M6 × 1 mm10 mm6 mm185DIN 9851093625A2260000
    M8 × 1.25 mm13 mm8 mm185DIN 9851093625A2270000
    M10 × 1.5 mm17 mm10 mm185DIN 9851093625A22800000
    M12 × 1.75 mm19 mm12 mm185DIN 985593625A2290000
     
    316 Stainless Steel
    4-40
    1/4"9/64"18510090715A0050000
    5-40
    1/4"9/64"1855090715A0060000
    6-32
    5/16"11/64"18510090715A0070000
    8-32
    11/32"15/64"18510090715A00900000
    10-24
    3/8"15/64"18510090715A01100000
    10-32
    3/8"15/64"1855090715A1150000
    12-24
    7/16"5/16"1855090715A22200000
    1/4"-20
    7/16"5/16"1855090715A1250000
    1/4"-28
    7/16"5/16"1855090715A1300000
    5/16"-18
    1/2"11/32"1855090715A13500000
    5/16"-24
    1/2"11/32"1852590715A1400000
    3/8"-16
    9/16"29/64"1852590715A1450000
    3/8"-24
    9/16"29/64"1852590715A14800000
    7/16"-14
    5/8"29/64"1851090715A0320000
    7/16"-20
    5/8"29/64"1851090715A0340000
    1/2"-13
    3/4"19/32"1851090715A1650000
    1/2"-20
    3/4"19/32"1851090715A17000000
    9/16"-12
    7/8"41/64"185190715A1730000
    9/16"-18
    7/8"41/64"185190715A2230000
    5/8"-11
    15/16"3/4"185590715A1850000
    5/8"-18
    15/16"3/4"185190715A1870000
    3/4"-10
    1 1/16"7/8"185190715A0360000
    3/4"-16
    1 1/16"7/8"185190715A0380000
    7/8"-9
    1 1/4"63/64"185190715A0450000
    7/8"-14
    1 1/4"63/64"185190715A12200000
    1"-8
    1 7/16"1 3/64"185190715A0550000
    1"-12
    1 7/16"1 3/64"185190715A22400000
    1"-14
    1 7/16"1 3/64"185190715A12300000
    1 1/8"-7
    1 5/8"1 11/64"185190715A21000000
    1 1/4"-7
    1 13/16"1 25/64"185190715A21500000
    1 1/2"-6
    2 13/64"1 39/64"185190715A22000000
    M2.5 × 0.45 mm5 mm3.8 mm185DIN 9855094205A10100000
    M3 × 0.5 mm5.5 mm4 mm185DIN 9855094205A2200000
    M4 × 0.7 mm7 mm5 mm185DIN 9855094205A2300000
    M5 × 0.8 mm8 mm5 mm185DIN 9855094205A2400000
    M6 × 1 mm10 mm6 mm185DIN 9855094205A25000000
    M8 × 1.25 mm13 mm8 mm185DIN 9852594205A2600000
    M10 × 1.5 mm17 mm10 mm185DIN 9851094205A27000000
    M12 × 1.75 mm19 mm12 mm185DIN 9851094205A28000000
    M14 × 2 mm22 mm14 mm185DIN 985194205A2900000
    M16 × 2 mm24 mm16 mm185DIN 985594205A31000000
    M18 × 2.5 mm27 mm18.5 mm185DIN 985194205A31500000
    M20 × 2.5 mm30 mm20 mm185DIN 985194205A3200000
    M22 × 2.5 mm32 mm22 mm185DIN 985194205A1110000
    M24 × 3 mm36 mm24 mm185DIN 985194205A33000000
    M27 × 3 mm41 mm27 mm185DIN 985194205A35000000
    M30 × 3.5 mm46 mm30 mm185DIN 985194205A38000000
     
    High-Strength Lightweight Titanium
    Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.
    Grade 5 Titanium—The best of both worlds, these locknuts are lightweight like aluminum and as corrosion-resistant as 316 stainless steel. They're ideal for use in chemical-processing and water-treatment facilities since they stand up to strong acids and other harsh chemicals. Grade 5 is the strongest of all the titanium alloys due to its higher aluminum and vanadium content.
    Thread
    Size
    Wd.
    Ht.
    Insert Max.
    Temp.
    Pkg.
    Qty.
    Pkg.
    Grade 5 Titanium
    4-40
    1/4"9/64"Not Rated194528A11200000
    6-32
    5/16"11/64"Not Rated194528A1130000
    8-32
    11/32"15/64"Not Rated194528A1140000
    10-24
    3/8"15/64"Not Rated194528A11500000
    10-32
    3/8"15/64"Not Rated194528A11600000
    1/4"-20
    7/16"5/16"Not Rated194528A1170000
    5/16"-18
    1/2"11/32"Not Rated194528A1180000
    3/8"-16
    9/16"29/64"Not Rated194528A11900000
    1/2"-13
    3/4"19/32"Not Rated194528A12100000
     
    Lightweight Aluminum
    Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.
    6061 Aluminum—One-third the weight of steel, these nuts are commonly used in robotics, automation, and other applications that have weight limitations. They're an alternative to stainless steel for rust resistance but are not as strong.
    Thread
    Size
    Wd.
    Ht.
    Insert Max.
    Temp., ° F
    Pkg.
    Qty.
    Pkg.
    6061 Aluminum
    8-32
    11/32"15/64"1852595856A21500000
    10-24
    3/8"15/64"1852595856A2250000
    10-32
    3/8"15/64"1852595856A2350000
    1/4"-20
    7/16"5/16"1852595856A2450000
    Aluminum Nylon-Insert Locknut, 1/4"-20 Thread Size
    Pack of 25In stock
    Compatible Products for This Locknut
    5/16"-18
    1/2"11/32"1852595856A2550000
    3/8"-16
    9/16"29/64"1851095856A2650000
    1/2"-13
    3/4"19/32"185595856A2750000
     
    Brass
    Image of Product. Front orientation. Locknuts. Nylon-Insert Locknuts.
    Brass—Conductive and nonmagnetic, brass locknuts are typically used to secure electrical equipment, such as circuit board assemblies and mounting brackets inside enclosures. They're also softer than most metals, so they won't damage other fastening components.
    Thread
    Size
    Wd.
    Ht.
    Insert Max.
    Temp., ° F
    Pkg.
    Qty.
    Pkg.
    Brass
    4-40
    1/4"9/64"1855092092A101000000
    6-32
    5/16"11/64"1852592092A0210000
    8-32
    11/32"15/64"1852592092A0230000
    10-24
    3/8"15/64"1852592092A0250000
    10-32
    3/8"15/64"1852592092A0270000
    1/4"-20
    7/16"5/16"1851092092A0290000
    5/16"-18
    1/2"11/32"1851092092A03000000
    3/8"-16
    9/16"29/64"185592092A0310000
    1/2"-13
    3/4"19/32"185192092A0330000
    5/8"-11
    15/16"3/4"185192092A03500000
    3/4"-10
    1 1/16"7/8"185192092A03600000
     
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