• Item:Hex Socket Head Cap Screw, Alloy Steel Hex Socket Cap Screw, Stainless Steel Hex Socket Cap Screw, Allen Bolt
  • According To:ASME B18.3-2002
  • Material:Alloy Steel SCM435、Stainless Steel 304
  • Hardness:HRC 39~45
  • Surface Treatment:Black Oxide, Black phosphate plated, Bright Zinc plated, CR3+ plated, Black Zinc plated, Nickel plated, Nylon or ND patch
  • Screw Threads:ANSI B1.1 UNC, UNF
  • Class of Thread:#6 Through 1"-3A Over 1" - -2A

Unit:inch

Nominal
Size or Basic
Screw
Diameter
D A H J T F LT
Body
Diameter
Head
Diameter
Head
Height
Hexagon Socket
Size
Key
Engagement
Fillet Transition
Diameter
Thread
Length
Basic.
Max. Min. Max. Min. Max. Min. Nom. Min. Max. Min.
#6
0.1380
0.1380 0.1329 0.226 0.218 0.138 0.134 7/64
0.109
0.064 0.158 0.144 0.75
#8
0.1640
0.1640 0.1585 0.270 0.262 0.164 0.159 9/64
0.141
0.077 0.188 0.172 0.88
#10
0.1900
0.1900 0.1840 0.312 0.303 0.190 0.185 5/32
0.156
0.090 0.218 0.202 0.88
1/4
0.2500
0.2500 0.2435 0.375 0.365 0.250 0.244 3/16
0.188
0.120 0.278 0.261 1.00
5/16
0.3125
0.3125 0.3053 0.469 0.457 0.312 0.306 1/4
0.250
0.151 0.347 0.329 1.12
3/8
0.3750
0.3750 0.3678 0.562 0.550 0.375 0.368 5/16
0.312
0.182 0.415 0.397 1.25
7/16
0.4375
0.4375 0.4294 0.656 0.642 0.438 0.430 3/8
0.375
0.213 0.484 0.465 1.38
1/2
0.5000
0.5000 0.4919 0.75 0.735 0.500 0.492 3/8
0.375
0.245 0.552 0.531 1.50
5/8
0.6250
0.6250 0.6163 0.938 0.921 0.625 0.616 1/2
0.500
0.307 0.689 0.664 1.75
3/4
0.7500
0.7500 0.7406 1.125 1.107 0.750 0.740 5/8
0.625
0.370 0.828 0.800 2.00
7/8
0.8750
0.8750 0.8647 1.312 1.293 0.875 0.864 3/4
0.750
0.432 0.963 0.932 2.25
1
1.0000
1.0000 0.9886 1.500 1.479 1.000 0.988 3/4
0.750
0.495 1.100 1.068 2.50