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AIC261M5D21 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

AIC261M5D21: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: DOUBLE HEXAGON, grip_length: 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN, head_height: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.467 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-487-2514, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
AIC261M5D21
NSN: 5306-00-487-2514
FSC: 5306 — Bolts
CAGE: 06725 — SPS TECHNOLOGIES, LLC DBA AIR INDUSTRIES COMPANY DIV AIR INDUSTRIES COMPANY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleDOUBLE HEXAGON
grip_length1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN
head_height0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
thread_class3A A
thread_length0.467 INCHES NOMINAL IN
fastener_length1.783 INCHES MINIMUM AND 1.810 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
features_providedUNFINISHED HEAD
surface_treatmentCADMIUM OVERALL
width_between_flats0.561 INCHES MINIMUM IN
nominal_thread_diameter0.312 INCHES IN
NSN5306-00-487-2514
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AIC261M5D21 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
HEAD HEIGHT: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.783 INCHES MINIMUM AND 1.810 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MAC PS13145,MCDONNELL DOUGLAS CORP MFR REF SINGLE TREATMENT RESPONSE OVERALL
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THREAD LENGTH: 0.467 INCHES NOMINAL IN
•
SHANK UNTHREADED HOLE DIAMETER: 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: 76301-23-105,TYPE 1 A MFR REF SINGLE MATERIAL RESPONSE OVERALL A
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
FEATURES PROVIDED: UNFINISHED HEAD
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
FASTENER LENGTH1.783 INCHES MINIMUM AND 1.810 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMAC PS13145,MCDONNELL DOUGLAS CORP MFR REF SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.467 INCHES NOMINAL IN
SHANK UNTHREADED HOLE DIAMETER0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATION76301-23-105,TYPE 1 A MFR REF SINGLE MATERIAL RESPONSE OVERALL A
NOMINAL THREAD DIAMETER0.312 INCHES IN
FEATURES PROVIDEDUNFINISHED HEAD
HEAD STYLEDOUBLE HEXAGON
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-004-7044 5306-00-007-6129 5306-00-008-7899 5306-00-009-4739 5306-00-118-7332 5306-00-151-1777 5306-00-255-4507 5306-01-101-2459
SUBSTITUTES & CROSS-REFERENCES 1
3M261-5D21Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AIC261M5D21?
AIC261M5D21 is a BOLT,MACHINE.
What parts can replace AIC261M5D21?
There is 1 known substitute for AIC261M5D21: 3M261-5D21. Substitute compatibility should be verified for your specific system.
What is the NSN for AIC261M5D21?
AIC261M5D21 is cataloged in the U.S. Government catalog under NSN 5306-00-487-2514. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.