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EMANON PART NO.
AN4-21A
AN4-21A is a bolt in steel, cadmium and chromate finish, 0.250 INCHES diameter and 2.156 inches length.
Bolt
SPECIFICATIONS
KEY DIMENSIONS
DIAMETER0.250 in
LENGTH2.156 in
THREAD LENGTHMinimum 0.468 in
GRIP1.688 in
THREAD
THREAD1/4-28
HEAD & DRIVE
HEADHexagon
HEAD HEIGHTMinimum 0.140 in; maximum 0.172 in
WIDTH ACROSS FLATS0.428–0.440 in
MATERIAL & FINISH
MATERIALSteel
MATERIAL SPECMIL-B-6812 — MIL SPEC
FINISHCadmium and chromate
FINISH SPECQQ-P-416,TYPE 2,CLASS 3 ALL TREATMENT RESPONSES
MECHANICAL
TENSILE STRENGTH125,000 psi
HARDNESS26–32 HRC
STANDARDS & TRACEABILITY
NSN5306-00-151-1415
GOVERNING STANDARDAN4-21A
FLIS · NSN 5306-00-151-1415 · retrieved 2026-08-07
DOCUMENTS
✓Certificate of Conformance & test reports available for most products (standard cert fees apply)
No drawing on file — request it
length: 2-5/32", grip: 1-11/16", thread: 1/4-28, cadmium plated steel, undrilled shank
Emanon is a stocking distributor — quality-system certifications are held by the certified manufacturers we source from, not by Emanon. Every shipment carries manufacturer certifications and full lot traceability.