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System of Measurement
Inch
Metric
Thread Size
0-80
1-64
1-72
2-56
2-64
3-48
3-56
4-40
4-48
5-40
5-44
6-32
6-40
8-32
8-36
10-24
10-32
12-24
Length
1/8"
5/32"
3/16"
1/4"
5/16"
3/8"
7/16"
1/2"
9/16"
5/8"
3/4"
7/8"
1"
1
1/8"
1
1/4"
1
3/8"
1
1/2"
1
5/8"
Finish
Black Oxide
Cadmium Plated
Dyed
Zinc Plated
Drive Style
Hex
Tamper-Resistant Torx
Tamper-Resistant Torx Plus
Torx
Torx Plus
Flat Head Profile
Standard
Undercut
Material
Alloy Steel
Steel
Countersink Angle
60°
82°
90°
Threading
Fully Threaded
Partially Threaded
Head Diameter
0.138"
0.168"
0.187"
0.197"
0.212"
0.226"
0.255"
0.262"
0.281"
0.307"
0.312"
0.359"
0.362"
0.411"
0.422"
0.438"
0.477"
0.507"
Fastener Strength Grade/Class
Class 8.8
Class 10.9
Class 12.9
Head Height
0.031"
0.042"
0.044"
0.047"
0.053"
0.054"
0.059"
0.064"
0.067"
0.07"
0.073"
0.078"
0.081"
0.083"
0.09"
0.097"
0.099"
0.1"
Drive Size
0.035"
0.050"
1/16"
5/64"
3/32"
1/8"
5/32"
3/16"
7/32"
1/4"
5/16"
3/8"
1/2"
9/16"
5/8"
3/4"
7/8"
1"
Tensile Strength
60,000 psi
120,000 psi
130,000 psi
140,000 psi
160,000 psi
170,000 psi
Thread Type
Metric
UNC
UNF
UNS
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
3 mm
3.5 mm
Specifications Met
ASME Standard
ASTM F835
DIN 7991
ISO Standard
Thread Spacing
Coarse
Fine
Performance
High Strength
Tamper Resistant
Vibration Resistant
DFARS Specialty Metals
Compliant
Exempt
Not Compliant
RoHS
Compliant
Not Compliant
REACH
Compliant
Not Compliant
U.S.–Mexico–Canada Agreement (USMCA) Qualifying
Yes
No
Export Control Classification Number (ECCN)
EAR99
Thread Fit
Metric Class 4g6g
Metric Class 5g6g
Metric Class 6g
Metric Class 6h
Unified Standard Class 2A
Unified Standard Class 3A
Hardness
Rockwell B70
Rockwell C22
Rockwell C32
Rockwell C37
Rockwell C38
Rockwell C39
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