Hex Socket Head Cap Screw Specifications
This document provides detailed dimensional specifications for hex socket head cap screws, measured in inches.
Dimensional Overview
The following diagrams illustrate the key dimensions of a hex socket head cap screw:
[Diagram showing a screw with labels: t (head height), k (head height), L (length), b (grip length), d (major diameter), s (socket size), dk (head diameter). The unit of measurement is indicated as inches.]
Size Specifications
The table below details the nominal diameter and various measurements for different screw sizes.
| Nominal Diameter | ds | dk | k | s | t | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| max | min | max | min | max | min | max | min | min | ||
| #0 | 0.0600 | 0.0568 | 0.096 | 0.091 | 0.060 | 0.057 | 0.050 | 0.025 | ||
| #1 | 0.0730 | 0.0695 | 0.118 | 0.112 | 0.073 | 0.070 | 0.062 | 0.031 | ||
| #2 | 0.0860 | 0.0822 | 0.140 | 0.134 | 0.086 | 0.083 | 0.078 | 0.038 | ||
| #3 | 0.0990 | 0.0949 | 0.161 | 0.154 | 0.099 | 0.095 | 0.078 | 0.044 | ||
| #4 | 0.1120 | 0.1075 | 0.183 | 0.176 | 0.112 | 0.108 | 0.094 | 0.051 | ||
| #5 | 0.1250 | 0.1202 | 0.205 | 0.198 | 0.125 | 0.121 | 0.094 | 0.057 | ||
| #6 | 0.1380 | 0.1329 | 0.226 | 0.218 | 0.138 | 0.134 | 0.109 | 0.064 | ||
| #8 | 0.1640 | 0.1585 | 0.270 | 0.262 | 0.164 | 0.159 | 0.141 | 0.077 | ||
| #10 | 0.1900 | 0.1840 | 0.312 | 0.303 | 0.190 | 0.185 | 0.156 | 0.090 | ||
| 1/4 | 0.2500 | 0.2435 | 0.375 | 0.365 | 0.250 | 0.244 | 0.188 | 0.120 | ||
Length and Diameter Specifications
The following table provides specifications for various lengths and diameters, including fractional inch sizes.
| Length (L) | Diameter (d) | ds max | ds min | dk max | dk min | k max | k min | s max | s min | t min |
|---|---|---|---|---|---|---|---|---|---|---|
| 5/16 | 0.3125 | 0.3053 | 0.469 | 0.457 | 0.312 | 0.306 | 0.250 | 0.151 | ||
| 3/8 | 0.3750 | 0.3678 | 0.562 | 0.550 | 0.375 | 0.368 | 0.312 | 0.182 | ||
| 7/16 | 0.4375 | 0.4294 | 0.656 | 0.642 | 0.438 | 0.430 | 0.375 | 0.213 | ||
| 1/2 | 0.5000 | 0.4919 | 0.750 | 0.735 | 0.500 | 0.492 | 0.375 | 0.245 | ||
| 5/8 | 0.6250 | 0.6163 | 0.938 | 0.921 | 0.625 | 0.616 | 0.500 | 0.307 | ||
| 3/4 | 0.7500 | 0.7406 | 1.125 | 1.107 | 0.750 | 0.740 | 0.625 | 0.370 | ||
| 7/8 | 0.8750 | 0.8647 | 1.312 | 1.293 | 0.875 | 0.864 | 0.750 | 0.432 | ||
| 1 | 1.0000 | 0.9886 | 1.500 | 1.479 | 1.000 | 0.988 | 0.750 | 0.495 | ||
| 1-1/8 | 1.1250 | 1.1086 | 1.688 | 1.665 | 1.125 | 1.111 | 0.875 | 0.557 | ||
| 1-1/4 | 1.2500 | 1.2336 | 1.875 | 1.852 | 1.250 | 1.236 | 0.875 | 0.620 | ||
| 1-3/8 | 1.3750 | 1.3568 | 2.062 | 2.038 | 1.375 | 0.360 | 1.000 | 0.682 | ||
| 1-1/2 | 1.5000 | 1.4818 | 2.250 | 2.224 | 1.500 | 1.485 | 1.000 | 0.745 | ||
| 1-3/4 | 1.7500 | 1.7295 | 2.625 | 2.597 | 1.750 | 1.734 | 1.250 | 0.870 | ||
| 2 | 2.0000 | 1.9780 | 3.000 | 2.970 | 2.000 | 1.983 | 1.500 | 0.995 | ||
| 2-1/4 | 2.2500 | 2.2280 | 3.375 | 3.344 | 2.250 | 2.232 | 1.750 | 1.120 | ||
| 2-1/2 | 2.5000 | 2.4762 | 3.750 | 3.717 | 2.500 | 2.481 | 1.750 | 1.245 | ||
| 2-3/4 | 2.7500 | 2.7262 | 4.125 | 4.090 | 2.750 | 2.730 | 2.000 | 1.370 | ||
| 3 | 3.0000 | 2.9762 | 4.500 | 4.464 | 3.000 | 2.979 | 2.250 | 1.495 | ||
| 3-1/4 | 3.2500 | 3.2262 | 4.875 | 4.837 | 3.250 | 3.228 | 2.250 | 1.620 | ||
| 3-1/2 | 3.5000 | 3.4762 | 5.250 | 5.211 | 3.500 | 3.478 | 2.750 | 1.745 | ||
| 3-3/4 | 3.7500 | 3.7262 | 5.625 | 5.584 | 3.750 | 3.727 | 2.750 | 1.870 | ||
| 4 | 4.0000 | 3.9762 | 6.000 | 5.958 | 4.000 | 3.976 | 3.000 | 1.995 |
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