McMaster-Carr logo
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    82 Products

    Rotating Flange Nuts

    The head of these nuts rotates while the flange remains stationary, so you won't scratch the surface of finished parts as you tighten. They distribute pressure evenly across the mounting surface without the need for a separate washer. Also known as collar nuts.
    Steel
    Image of Product. Front orientation. Contains Annotated. Flange Nuts. Rotating Flange Nuts.
    Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.
    Flange
    Thread Size
    Wd.
    Ht.
    Dia.
    Thk.
    Material
    Each
    Black-Oxide Steel
    1/4"-20
    1/2"3/8"5/8"0.13"Steel90477A02900000
    1/4"-28
    1/2"3/8"5/8"0.13"Steel90477A1110000
    5/16"-18
    9/16"7/16"3/4"0.14"Steel90477A0300000
    5/16"-24
    9/16"7/16"3/4"0.14"Steel90477A1120000
    3/8"-16
    11/16"17/32"7/8"0.16"Steel90477A0310000
    3/8"-24
    11/16"17/32"7/8"0.16"Steel90477A1130000
    1/2"-13
    7/8"23/32"1 1/8"0.22"Steel90477A0330000
    1/2"-20
    7/8"23/32"1 1/8"0.22"Steel90477A1140000
    5/8"-11
    1 1/16"29/32"1 3/8"0.25"Steel90477A0350000
    5/8"-18
    1 1/16"29/32"1 3/8"0.25"Steel90477A1150000
    3/4"-10
    1 1/4"1 1/64"1 5/8"0.28"Steel90477A03600000
    3/4"-16
    1 1/4"1 1/64"1 5/8"0.28"Steel90477A11600000
    7/8"-9
    1 7/16"1 1/8"1 3/4"0.44"Steel90477A03700000
    7/8"-14
    1 7/16"1 1/8"1 3/4"0.44"Steel90477A11700000
    1"-8
    1 5/8"1 15/64"2"0.47"Steel90477A03800000
    1"-12
    1 5/8"1 15/64"2"0.47"Steel90477A11800000
    M6 × 1 mm13 mm9.5 mm15.9 mm3.2 mmSteel90477A1190000
    M8 × 1.25 mm14 mm11.1 mm19 mm3.6 mmSteel90477A1210000
    M10 × 1.5 mm17 mm13.5 mm22.2 mm5.6 mmSteel90477A1220000
    M12 × 1.75 mm22 mm18.3 mm28.6 mm5.6 mmSteel90477A1230000
    M16 × 2 mm27 mm23 mm34.9 mm6.4 mmSteel90477A1240000
    M20 × 2.5 mm37 mm28.6 mm44.5 mm11.1 mmSteel90477A12500000
    M24 × 3 mm41 mm31.3 mm50.8 mm11.9 mmSteel90477A12600000
     

    Locknuts with External-Tooth Lock Washer

    Image of Product. Front orientation. ZoomedIn view. Locknuts. Locknuts with External-Tooth Lock Washer.
    To save on assembly time, these locknuts combine a hex nut with a free-spinning lock washer, so you can twist them into place by hand. Once the nut is against your material surface, tighten it down with a wrench or socket to get the teeth to bite. Although these nuts install more quickly than nylon-insert locknuts, they don't hold up as well against vibration and can mar your material. As long as the washer stays intact, you can reuse them. Also known as Keps and K-lock nuts.
    Medium-Strength Steel
    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-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.
    Black-Zinc-Plated Steel—The dark zinc plating withstands occasional exposure to moisture while creating a finished look.
    Thread Size
    Wd.,
    mm
    Ht.,
    mm
    Fastener Strength
    Grade/Class
    Washer
    OD, mm
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    M3 × 0.5 mm5.53.3ISO Class 8
    7.110093825A110000000
    M4 × 0.7 mm74.1ISO Class 8
    8.510093825A12000000
    M5 × 0.8 mm85.2ISO Class 8
    9.510093825A13000000
    M6 × 1 mm106.2ISO Class 8
    1210093825A14000000
    M8 × 1.25 mm138.5ISO Class 8
    15.52593825A1600000
    M10 × 1.5 mm179.7ISO Class 8
    20.11093825A17000000
     
    Black-Zinc-Plated Steel
    M3 × 0.5 mm5.53ISO Class 8
    7.110093825A21000000
    M4 × 0.7 mm74.1ISO Class 8
    8.510093825A22000000
    M5 × 0.8 mm85.2ISO Class 8
    9.510093825A23000000
    M6 × 1 mm106.2ISO Class 8
    125093825A24000000
    M8 × 1.25 mm138.5ISO Class 8
    15.52593825A25000000
    M10 × 1.5 mm179.7ISO Class 8
    20.11093825A26000000
     
    Low-Strength Steel
    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-Zinc-Plated Steel—The dark zinc plating withstands occasional exposure to moisture while creating a finished look.
    Thread
    Size
    Wd.
    Ht.
    Washer
    OD
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    4-40
    1/4"7/64"0.281"10090675A00500000
    5-40
    5/16"9/64"0.344"10090675A2450000
    6-32
    5/16"9/64"0.344"10090675A0070000
    8-32
    11/32"5/32"0.375"10090675A0090000
    10-24
    3/8"5/32"0.406"10090675A0110000
    10-32
    3/8"5/32"0.406"10090675A1950000
    12-24
    7/16"3/16"0.5"5090675A2550000
    1/4"-20
    7/16"15/64"0.5"10090675A0290000
    1/4"-28
    7/16"15/64"0.5"10090675A2150000
    5/16"-18
    1/2"21/64"0.578"10090675A03000000
    5/16"-24
    1/2"5/16"0.592"5090675A22500000
    3/8"-16
    9/16"25/64"0.656"10090675A03100000
    3/8"-24
    9/16"25/64"0.656"10090675A23500000
    1/2"-13
    3/4"31/64"0.891"1090675A26500000
     
    Black-Zinc-Plated Steel
    4-40
    1/4"1/8"0.281"10090328A1010000
    6-32
    5/16"9/64"0.344"10090328A1020000
    8-32
    11/32"5/32"0.375"10090328A1030000
    10-24
    3/8"5/32"0.406"10090328A10400000
    10-32
    3/8"5/32"0.406"10090328A10500000
    1/4"-20
    7/16"7/32"0.5"10090328A10600000
     
    Corrosion-Resistant Stainless Steel
    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.
    Thread Size
    Wd.
    Ht.
    Washer
    OD
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    4-40
    1/4"1/8"0.281"10096278A00500000
    4-48
    1/4"1/8"0.281"10096278A10100000
    6-32
    5/16"9/64"0.344"10096278A0070000
    8-32
    11/32"11/64"0.375"10096278A00900000
    10-24
    3/8"11/64"0.406"10096278A01100000
    10-32
    3/8"11/64"0.406"10096278A41100000
    12-24
    7/16"11/64"0.5"5096278A11100000
    1/4"-20
    7/16"15/64"0.5"5096278A51100000
    1/4"-28
    7/16"15/64"0.5"5096278A5150000
    5/16"-18
    1/2"21/64"0.578"2596278A5190000
    5/16"-24
    1/2"21/64"0.578"2596278A52300000
    3/8"-16
    9/16"25/64"0.656"2596278A52700000
    3/8"-24
    9/16"25/64"0.656"1096278A5310000
    1/2"-13
    3/4"7/16"0.871"1096278A1120000
    M3 × 0.5 mm5.5 mm3.3 mm6.5 mm5090923A21600000
    M4 × 0.7 mm7 mm4.1 mm8.2 mm5090923A21900000
    M5 × 0.8 mm8 mm5.2 mm9.5 mm2590923A2220000
    M6 × 1 mm10 mm6.2 mm11.5 mm2590923A2270000
    M8 × 1.25 mm13 mm8.5 mm15.1 mm590923A2410000
    M10 × 1.5 mm17 mm9.7 mm19.2 mm590923A28200000
     
    Black-Oxide 18-8 Stainless Steel
    M3 × 0.5 mm5.5 mm3.3 mm6.5 mm2590923A2310000
    M4 × 0.7 mm7 mm4.1 mm8.2 mm2590923A23200000
    M5 × 0.8 mm8 mm5.2 mm9.5 mm2590923A23300000
    M6 × 1 mm10 mm6.2 mm11.5 mm2590923A23400000
     

    Narrow-Profile Locknuts with External-Tooth Lock Washer

    Image of Product. Front orientation. Locknuts. Narrow-Profile Locknuts with External-Tooth Lock Washer.
    Since they're about 20% narrower, these locknuts fit in tight spaces where standard-profile nuts won't fit. They combine a hex nut with a free-spinning lock washer, so you can twist them into place by hand and save on assembly time. Once the nut is against your material surface, tighten it down with a wrench or socket to get the teeth to bite. Although these nuts install more quickly than nylon-insert locknuts, they don't hold up as well against vibration and can mar your material. As long as the washer stays intact, you can reuse them. Also known as Keps and K-lock nuts.
    Low-Strength Steel
    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.
    Thread
    Size
    Wd.
    Ht.
    Washer
    OD
    Pkg.
    Qty.
    Pkg.
    Zinc-Plated Steel
    6-32
    1/4"1/8"0.281"10090413A101000000
    8-32
    5/16"9/64"0.344"10090413A10200000
     
    Corrosion-Resistant Stainless Steel
    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.
    Thread
    Size
    Wd.
    Ht.
    Washer
    OD
    Pkg.
    Qty.
    Pkg.
    18-8 Stainless Steel
    6-32
    1/4"3/32"0.344"10096278A113000000
     
    back to top