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System of Measurement
Inch
Metric
Thread Size
2-56
4-40
5-40
6-32
8-32
10-24
10-32
1/4"
-20
1/4"
-28
5/16"
-18
5/16"
-24
3/8"
-16
3/8"
-24
7/16"
-14
7/16"
-20
1/2"
-13
5/8"
-11
3/4"
-10
Nut Type
Cap
Sealing
Square
Tamper Resistant
Material
Aluminum Bronze
Brass
Buna-N
Carbon Fiber
Fiberglass
Stainless Steel
Steel
Width
3/16"
1/4"
5/16"
11/32"
3/8"
7/16"
1/2"
9/16"
5/8"
3/4"
13/16"
7/8"
1"
1
3/64"
1
1/8"
1
1/4"
1
5/16"
1
1/2"
1
11/16"
1
7/8"
2
1/4"
4 mm
5 mm
5.5 mm
7 mm
8 mm
10 mm
13 mm
17 mm
19 mm
24 mm
30 mm
Height
1/16"
3/32"
7/64"
1/8"
3/16"
7/32"
15/64"
1/4"
17/64"
21/64"
3/8"
13/32"
7/16"
1/2"
17/32"
35/64"
41/64"
21/32"
49/64"
51/64"
7/8"
57/64"
1"
1
3/32"
1
9/64"
1
5/16"
4
5/32"
1.2 mm
1.6 mm
1.8 mm
2.2 mm
2.7 mm
3 mm
3.2 mm
4 mm
5 mm
6.5 mm
8 mm
10 mm
13 mm
16 mm
Finish
Black Oxide
Black Zinc Plated
Chrome Plated
Hot-Dipped Galvanized
Painted
Zinc Plated
Zinc Yellow-Chromate Plated
Thread Pitch
0.4 mm
0.45 mm
0.5 mm
0.7 mm
0.8 mm
1 mm
1.25 mm
1.5 mm
1.75 mm
2 mm
2.5 mm
Thread Type
Metric
UNC
UNF
Thread Spacing
Coarse
Fine
Thread Direction
Right Hand
Fastener Strength Grade/Class
Class 04
Class 5
SAE Grade 5
Length
7/8"
1"
1
1/16"
1
1/8"
1
1/4"
1
5/16"
1
1/2"
1
5/8"
1
3/4"
1
13/16"
1
7/8"
1
15/16"
2"
2
1/16"
2
1/8"
2
3/16"
2
1/4"
2
3/8"
2
1/2"
2
3/4"
3
1/4"
3
1/2"
5"
6"
6
7/8"
7"
7
1/2"
7
3/4"
7
7/8"
8
1/4"
8
5/8"
9
1/8"
9
1/2"
9
5/8"
10"
10
3/8"
10
5/8"
11
1/8"
11
1/4"
27
1/2"
Fastener Strength Rating
Low
Medium
Drive Style
Hide
Drilled Spanner
External 8-Point
External 12-Point
External Hex
External Octagon
External Pentagon
External Square
External Torx
External Torx Plus
Hex
No Drive
One Way
Phillips
Serrated Edge
Slotted
Square
Tamper-Resistant Torx
Torx
Tri-Groove
Wing
Specifications Met
DIN 557
DIN 562
Thread Fit
Metric Class 6H
Metric Class 7H
Unified Standard Class 2B
DFARS Specialty Metals
Exempt
Not Compliant
RoHS
Compliant
Compliant with Exemptions
Not Compliant
Export Control Classification Number (ECCN)
EAR99
REACH
Compliant
Not Compliant
Performance
Corrosion Resistant
Metal Detectable
Nonsparking
X-Ray Detectable
Color
Gray
Cap Nut Profile
High
Tensile Strength
10,000 psi to 19,999 psi
OD
15/32"
9/16"
5/8"
21/32"
11/16"
3/4"
13/16"
7/8"
29/32"
15/16"
31/32"
1"
1
1/32"
1
1/16"
1
1/8"
1
9/64"
1
3/16"
1
13/64"
1
9/32"
1
19/64"
1
5/16"
1
11/32"
1
3/8"
1
7/16"
1
1/2"
1
39/64"
1
5/8"
1
11/16"
1
3/4"
1
13/16"
1
27/32"
2"
2
1/8"
2
1/4"
2
5/16"
2
11/32"
2
3/8"
2
1/2"
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281 Products
Square Nuts
Low-Strength Steel Square Nuts
About half the strength of medium-strength steel for light duty fastening
64 products
18-8 Stainless Steel Square Nuts
Resist corrosion where moisture and chemicals are present
24 products
18-8 Stainless Steel Thin-Profile Square Nuts
Use in low-clearance areas where moisture and chemicals are present
10 products
Medium-Strength Steel Square Nuts
Suitable for fastening most machinery and equipment
22 products
Medium-Strength Steel Thin-Profile Square Nuts
Two-thirds the height of standard nuts for low-clearance areas
8 products
Highly Corrosion-Resistant 316 Stainless Steel Square Nuts
Withstand harsh chemicals better than 18-8 stainless steel
12 products
Ultra-High-Temperature Carbon Fiber Square Nuts
Won't warp in extreme-heat applications such as furnace fixtures
6 products
Brass Square Nuts
Conductive and nonmagnetic for securing electrical equipment
9 products
Fiberglass Square Nuts
Chemical resistant, nonconductive, and lightweight
5 products
Other Products
Cap Nuts
Cover and protect threads while adding a finished look; also known as acorn nuts
2 products
Tamper-Resistant Nuts
Hard to detach without special tools to prevent unwanted removal
6 products
Sockets
Turn fasteners with an external drive style without slipping and damaging the drive
88 products
Socket Wrenches
Apply torque to turn nuts, bolts, and other fasteners without rounding the heads
20 products
The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)