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Types of Heads

Slotted Screw Sizes

Types of Heads

Note: When ordering slotted bits, please remember that head sizes and slot widths of hardened, self tapping, and sheet metal screws do not conform to the same specifications as standard wood or machine screws described in the chart below. Also, because of variations in these dimensions among screws from different manufacturers, bits should be ordered to head and slot size rather than screw size.

Screw Sizes	Flat Head Oval Head		Round Head		Truss Head	Binding Head	Fillister		Pan Head	Width of Slot
Screw Sizes	Wood	Mach.	Wood	Mach.	Truss Head	Binding Head	Cap	Mach.	Pan Head	Width of Slot
1	.146	.146	.138	.138				.118		.026
1	.130	.130	.122	.122				.104		.019
2	.172	.172	.162	.162	.194	.181		.140	.167	.031
2	.156	.156	.146	.146	.180	.171		.124	.155	.023
3	.199	.199	.187	.187	.226	.208		.161	.193	.035
3	.181	.181	.169	.169	.211	.197		.145	.180	.027
4	.225	.225	.211	.211	.257	.235		.183	.219	.039
4	.207	.207	.193	.193	.241	.223		.166	.205	.031
5	.252	.252	.236	.236	.289	.263		.205	.245	.043
5	.232	.232	.217	.217	.272	.249		.187	.231	.035
6	.279	.279	.260	.260	.321	.290		.226	.270	.048
6	.257	.257	.240	.240	.303	.275		.208	.256	.039
7	.305		.285		.352				.296	.048
7	.283		.264		.333				.281	.039
8	.332	.332	.309	.309	.384	.344		.270	.322	.054
8	.308	.308	.287	.287	.364	.326		.250	.306	.045
9	.358		.334							.054
9	.334		.311							.045
10	.385	.385	.359	.359	.448	.339		.313	.373	.060
10		.359	.334	.334	.425	.378		.292	.357	.050
12	.438	.438	.408	.408	.511	.454		.357	.425	.067
12	.410	.410	.382	.382	.487	.430		.334	.407	.056
14	.491		.457							.075
14	.461		.424							.064
1/4"		.507		.472	.573	.513	.375	.414	.492	.075
1/4"		.477		.443	.546	.488	.363	.389	.473	.064
16	.544		.506							.075
16	.512		.476							.064
18	.597		.555							.084
18	.563		.523							.072
5/16"		.635		.590	.698	.641	.437	.518	.615	.084
5/16"		.600		.557	.666	.609	.424	.490	.594	.072
20	.650		.604							.084
20	.614		.570							.072
24	.756		.702							.094
24	.716		.664							.081
3/8"		.762		.708	.823	.769	.562	.622	.740	.094
3/8"		.722		.670	.787	.731	.547	.590	.716	.081

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APEX FASTENERS, Inc - 15858 Business Center Drive - Irwindale, CA 91706 USA
APEX Fasteners supplies standard and custom screws, nut retainers, shoulder screws, plastites and taptites, all types of rivets, spring steel fasteners and special stampings, sems screws in standard, fractional or metric to electronics, aviation and other OEM industries worldwide. ApexFasteners.com custom manufactures screw machine components for electronic enclosure hardware as well as cold forming and cold headed specials for assembly and production requirements.
Tel: (626) 962-2219 - info@apexfasteners.com