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Screw Weights
Screw Dimensions
Socket Dimensions
Key Dimensions

 

 

 

 

 

 

 

 

Weights of Machine Screws and Tapping Screws
(Approximate weight of 100 steel screws, in pounds)

Screw Size	2-56	3-48	4-40	5-40	6-32	8-32	10-24	10-32	12-24	1/4-20	5/16-18	3/8-16
Length (inches)
3/16	.05	.07	.09	.12	.15	.25	.38	.39	-	-	-	-
1/4	.06	.08	.10	.14	.17	.28	.41	.43	.56	.85	-	-
5/16	.06	.09	.12	.15	.19	.31	.44	.46	.61	.91	1.67	-
3/8	.07	.09	.13	.17	.21	.34	.48	.50	.65	.98	1.77	2.92
7/16	.08	.10	.15	.19	.22	.36	.51	.54	.69	1.04	1.88	3.07
1/2	.08	.11	.16	.20	.24	.39	.54	.58	.74	1.11	1.98	3.22
9/16	.09	.12	.17	.22	.26	.42	.58	.62	.78	1.17	2.09	3.36
5/8	.10	.13	.18	.23	.28	.45	.62	.66	.83	1.24	2.19	3.51
3/4	.11	.15	.21	.26	.32	.50	.69	.73	.92	1.36	2.40	3.80
7/8	.13	.17	.23	.30	.35	.56	.76	.81	1.01	1.49	2.61	4.10
1	.14	.19	.25	.34	.39	.62	.83	.89	1.10	1.61	2.82	4.40
1 1/8	-	-	.28	.38	.43	.67	.90	.96	1.19	1.74	3.02	4.70
1 1/4	-	-	.30	.41	.46	.73	.97	1.04	1.28	1.87	3.23	4.98
1 1/2	-	-	.35	.47	.53	.83	1.11	1.19	1.47	2.12	3.65	5.58
1 3/4	-	-	-	.53	.61	.94	1.25	1.35	1.65	2.37	4.07	6.17
2	-	-	-	.60	.68	1.06	1.38	1.50	1.83	2.62	4.48	6.76
2 1/4	-	-	-	-	.76	1.18	1.52	1.66	2.01	2.88	4.90	7.35
2 1/2	-	-	-	-	.83	1.29	1.66	1.81	2.15	3.01	5.15	7.75
2 3/4	-	-	-	-	.91	1.39	1.80	1.97	2.38	3.39	5.73	8.53
3	-	-	-	-	.98	1.50	1.94	2.12	2.56	3.64	6.15	9.13
3 1/4	-	-	-	-	-	1.62	2.08	2.27	2.74	3.90	6.57	9.70
3 1/2	-	-	-	-	-	1.74	2.22	2.42	2.92	4.15	7.00	10.30
3 3/4	-	-	-	-	-	-	2.36	2.58	3.10	4.40	7.40	10.90
4	-	-	-	-	-	-	2.50	2.73	3.28	4.66	7.82	11.50
4 1/2	-	-	-	-	-	-	2.77	3.04	3.66	5.16	8.65	12.70
5	-	-	-	-	-	-	3.05	3.35	4.02	5.67	9.50	13.90
5 1/2	-	-	-	-	-	-	3.33	3.66	4.38	6.18	10.33	15.10
6	-	-	-	-	-	-	3.60	3.96	4.75	6.70	11.17	16.30

 

 

 

 

 

Dimensions of Spanners and Screws

Pan Head Drilled Spanners	Nominal Size or Basic Screw Diameter A H Head Diameter Head Height Max Min Min Max 4 0.1120 0.219 0.205 0.068 0.058 6 0.1380 0.270 0.256 0.082 0.072 8 0.1640 0.322 0.306 0.096 0.085 10 0.1900 0.373 0.357 0.110 0.099 1/4 0.2500 0.492 0.473 0.144 0.130
Flat Head Drilled Spanners	Nominal Size or Basic Screw Diameter A H Head Diameter Head Height Theoretical Sharp Max Absolute Min Reference 4 0.1120 0.225 0.195 0.067 6 0.1380 0.279 0.244 0.083 8 0.1640 0.332 0.292 0.100 10 0.1900 0.385 0.340 0.116 1/4 0.2500 0.507 0.452 0.153
One-Way Round Head Screws	Nominal Size or Basic Screw Diameter Head Diameter Head Height 4 0.1120 0.211 0.193 0.086 0.075 6 0.1380 0.260 0.240 0.103 0.091 8 0.1640 0.309 0.287 0.120 0.107 10 0.1900 0.359 0.334 0.137 0.123 12 0.2160 0.408 0.382 0.153 0.139 1/4 0.2500 0.472 0.443 0.175 0.160
One-Way Oval Head Screws	Nominal Size or Basic Screw Diameter Head Diameter Total Head Height Head Side Height 6 0.1380 0.138 0.244 0.128 0.105 0.083 8 0.1640 0.164 0.292 0.152 0.126 0.100 10 0.1900 0.190 0.340 0.176 0.148 0.116 1/4 0.2500 0.250 0.452 0.232 0.197 0.153

 

 

 

 

 

 

Dimensions of Button Head Sockets (Dimensions for Hex and Torx Screws) with exception to the Drive Size Nominal size or Basic Screw Diameter A H J P Head Diameter Head Height Hex Size Pin Diameter Max Min Min Max Max Min 4 0.1120 0.213 0.201 0.059 0.051 3/32 0.035 0.032 6 0.1380 0.262 0.250 0.073 0.063 1/8 0.050 0.048 8 0.1640 0.312 0.298 0.087 0.077 5/32 0.065 0.062 10 0.1900 0.361 0.347 0.101 0.091 5/32 0.065 0.062 1/4 0.2500 0.437 0.419 0.132 0.122 5/32 0.065 0.062 5/16 0.3125 0.547 0.527 0.166 0.152 3/16 0.087 0.085 3/8 0.3750 0.656 0.636 0.199 0.185 7/32 0.095 0.090

 

 

 

 

 

 

 

Dimensions of Flat Head Sockets (Dimensions for Hex and Torx Screws) with exception to the Drive Size Nominal size or Basic Screw Diameter A H J P Head Diameter Head Height Hex Size Pin Diameter Theoretical Sharp Max Absolute Min Reference Flushness Tolerance Max Min 4 0.1120 0.255 0.218 0.083 0.011 3/32 0.035 0.032 6 0.1380 0.307 0.263 0.097 0.013 1/8 0.050 0.048 8 0.1640 0.359 0.311 0.112 0.014 5/32 0.065 0.062 10 0.1900 0.411 0.359 0.127 0.015 5/32 0.065 0.062 1/4 0.2500 0.531 0.480 0.161 0.016 5/32 0.065 0.062 5/16 0.3125 0.656 0.600 0.198 0.017 3/16 0.087 0.085 3/8 0.3750 0.781 0.720 0.234 0.018 7/32 0.095 0.090