4 Threads


Basic Part Number Thread Size Minor Dia. A B
±.005
C D Knurl
TPI
B256-4 2-56 .070 .156 .156 .141 .030 40
B440-4 4-40 .089 .188 .188 .171 .030* 40
B632-4 6-32 .110 .218 .219 .201 .062* 30
B832-4 8-32 .136 .250 .250 .225 .062* 30
B1024-4 10-24 .149 .281 .312 .259 .062* 30
B1032-4 10-32 .159 .281 .281 .259 .062* 30
B25020-4 1/4"-20 .201 .344 .375 .320 .094 20
B25028-4 1/4"-28 .214 .344 .375 .320 .094 20
B31218-4 5/16"-18 .257 .437 .469 .403 .094 20
B31224-4 5/16"-24 .272 .437 .469 .403 .094 20
B37516-4 3/8"-16 .312 .500 .562 .465 .094 20
B37524-4 3/8"-24 .333 .500 .562 .465 .094 20
*Non standard "D" dimension available in both .030 and .062 (BB832-4 .030)
Material Designation: Insert the letter "B" Brass or "C" Stainless as the first digit of part.

Notes:
Thread Spec. Per MIL-S-7742
Brass per ASTM-B-16
300 Series Stainless Steel per MIL-S-7720 ASTM A581/A582
Dimensional Limits plus or minus .003 unless specified.
Minor Thread Diameter Tolerance +.002/-.001
Part Number Example
Brass: BB632-4
Stainless: CB632-4

Molded Type Thread Blind Inserts 4 Thread




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.
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