Apex Fasteners

English Part Number	Thread Size	Minor Dia.	A	B ±.005	C	D	Knurl TPI
B256-10	2-56	.070	.156	.290	.141	.030	40
B440-10	4-40	.089	.188	.406	.171	.030*	40
B632-10	6-32	.110	.218	.484	.201	.062*	30
B832-10	8-32	.136	.250	.484	.225	.062*	30
B1024-10	10-24	.149	.281	.625	.259	.062*	30
B1032-10	10-32	.159	.281	.531	.259	.062*	30
B25020-10	1/4”-20	.201	.344	.688	.320	.094	20
B25028-10	1/4”-28	.214	.344	.625	.320	.094	20
B31218-10	5/16”-18	.257	.437	.830	.403	.094	20
B31224-10	5/16”-24	.272	.437	.719	.403	.094	20
B37516-10	3/8”-16	.312	.500	.938	.465	.094	20
B37524-10	3/8”-24	.333	.500	.812	.465	.094	20

B256-12	2-56	.070	.156	.330	.141	.030	40
B440-12	4-40	.089	.188	.468	.171	.030*	40
B632-12	6-32	.110	.218	.531	.201	.062*	30
B832-12	8-32	.136	.250	.531	.225	.062*	30
B1024-12	10-24	.149	.281	.656	.259	.062*	30
B1032-12	10-32	.159	.281	.531	.259	.062*	30
B25020-12	1/4”-20	.201	.344	.750	.320	.094	20
B25028-12	1/4”-28	.214	.344	.625	.320	.094	20
B31218-12	5/16”-18	.257	.437	1.000	.403	.094	20
B31224-12	5/16”-24	.272	.437	.719	.403	.094	20
B37516-12	3/8”-16	.312	.500	1.125	.465	.094	20
B37524-12	3/8”-24	.333	.500	.812	.465	.094	20
*Non standard “D” dimension available in both .030 and .062 (BB832-10 .030 or BBM4-10 .030) Material Designation: Insert the letter “B” Brass or “C” Stainless as the first digit of part.

Metric Part Number	Metric Thread Size	Metric Minor Dia.	A	B ±.005	C	D	Knurl TPI
BM2-10	M2x0.4	.063	.156	.290	.141	.030	40
BM3-10	M3x0.5	.099	.188	.406	.171	.030*	40
BM3.5-10	M3.5x0.6	.115	.218	.484	.201	.062*	30
BM4-10	M4x0.7	.131	.250	.484	.225	.062*	30
BM5-10	M5x0.8	.166	.281	.531	.259	.062*	30
BM6-10	M6x1.0	.199	.344	.688	.320	.094	20
BM8-10	M6x1.0	.266	.437	.830	.403	.094	20
BM10-10	M6x1.0	.337	.500	.938	.465	.094	20

BM2-12	M2x0.4	.063	.156	.330	.141	.030	40
BM3-12	M3x0.5	.099	.188	.468	.171	.030*	40
BM3.5-12	M3.5x0.6	.115	.218	.531	.201	.062*	30
BM4-12	M4x0.7	.131	.250	.531	.225	.062*	30
BM5-12	M5x0.8	.166	.281	.531	.259	.062*	30
BM6-12	M6x1.0	.199	.344	.750	.320	.094	20
BM8-12	M6x1.0	.266	.437	1.000	.403	.094	20
BM10-12	M6x1.0	.337	.500	1.125	.465	.094	20
*Non standard “D” dimension available in both .030 and .062 (BB832-10 .030 or BM4-10 .030) Material Designation: Insert the letter “B” Brass or “C” Stainless as the first digit of part.

Part Number Example

Brass: BB1032-10

Stainless: CB1032-12

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