Suggested Hole Sizes for Die Casting

The minimum length of thread engagement should be equal to twice the diameter of the screw. The hole diameter, to ensure optimum performance, should provide for 65% to 75% thread engagement.
Screw Size	Hole Diameter as Cast Std. Taper				F Hole Dia. as Drilled	L Length of Thread Engage- ment	H Boss Dia. Max.	J Distance to Edge for no Measurable Distortion - Min.
	A - Top		B - Bottom
	Max.	Min.	Max.	Min.
M2 x 0.40	1.91	1.83	1.81	1.73	1.81	4.00	3.32	1.04
2-56	.081	.078	.077	.074	.077	.172	.197	.046
M2.5x0.45	2.39	2.31	2.28	2.20	2.28	5.00	4.15	0.55
3-48	.093	.090	.088	.085	.088	.198	.208	.054
M3x0.5	2.90	2.82	2.76	2.68	2.76	6.00	4.98	0.61
5-40	.118	.115	.112	.109	.112	.250	.232	.065
M3.5x0.6	3.31	3.23	3.21	3.13	3.21	7.00	5.81	0.74
6-32	.128	.125	.122	.119	.122	.276	.242	.081
M4x0.7	3.82	3.74	3.64	3.56	3.64	8.0	6.64	0.86
8-32	.155	.152	.148	.145	.148	.328	.272	.081
M4.5x0.75	4.31	4.23	4.11	4.03	4.11	9.00	7.47	0.92
10-24	.177	.174	.168	.165	.168	.380	.315	.108
10-32	.182	.179	.174	.171	.174	.380	.315	.081
M5x0.8	4.8	4.72	4.58	4.50	4.58	10.00	8.30	.098
12-24	.203	.200	.194	.191	.194	.432	.359	.108
M6x1.0	5.75	5.66	5.48	5.40	5.48	12.00	9.96	1.23
M6.3x1.0	6.05	5.97	5.78	5.70	5.78	13.00	10.46	1.23
1/4-20	.235	.232	.224	.221	.224	.500	.415	.130
M7x1.0	6.78	6.70	6.48	6.40	6.48	14.00	11.62	1.23
5/16-18	.267	.294	.284	.281	.284	.625	.519	.144
M8x1.25	7.69	7.61	7.32	7.27	7.35	16.00	13.28	1.53
3/8-16	.359	.356	.343	.340	.343	.750	.623	.162
M10x1.5	9.64	9.56	9.22	9.14	9.22	20.00	16.60	1.84
7/16-14	.419	.416	.400	.397	.400	.875	.726	.186
M12x1.75	11.59	11.51	11.09	11.01	11.09	24.00	19.92	2.15
1/2-13	.481	.478	.460	.457	.460	1.00	.830	.200

• Torque Tensioning
• Screw Point Types
• Pilot Hole Sizes
• Bolt & Screw Head Types
• Weights per Thousand
• Unified External Screw Threads
• Rod & Bolt Diameters
• Metric Conversions
• Hole Sizes for Die Casting
• Material Strength
• Drive Tool Sizes
• Hardness Conversion

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