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AN3DD21 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY OVERALL, head_style: HEXAGON, grip_length: 1.734 INCHES MINIMUM AND 1.766 INCHES MAXIMUM IN, head_height: 0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.374 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-150-9854, 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
AN3DD21
NSN: 5306-00-150-9854
FSC: 5306
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
head_styleHEXAGON
grip_length1.734 INCHES MINIMUM AND 1.766 INCHES MAXIMUM IN
head_height0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
thread_class3A A
thread_length0.374 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
fastener_length2.141 INCHES MINIMUM AND 2.188 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentOXIDE FILM AND ANODIZE OVERALL
width_between_flats0.365 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
nominal_thread_diameter0.190 INCHES IN
NSN5306-00-150-9854
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN3DD21 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
HEAD HEIGHT: 0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.141 INCHES MINIMUM AND 2.188 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.374 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-200 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-225 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-430 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
HEAD STYLE: HEXAGON
•
SURFACE TREATMENT: OXIDE FILM AND ANODIZE OVERALL
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
HEAD HEIGHT0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
FASTENER LENGTH2.141 INCHES MINIMUM AND 2.188 INCHES MAXIMUM IN
THREAD LENGTH0.374 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-200 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-225 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-430 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
HEAD STYLEHEXAGON
SURFACE TREATMENTOXIDE FILM AND ANODIZE OVERALL
THREAD SERIES DESIGNATORUNF
GRIP LENGTH1.734 INCHES MINIMUM AND 1.766 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.190 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
AN173-21AUpgraded Successor
successor cross-reference
successor
B6812Upgraded Successor
successor cross-reference
successor
AN173H21AUpgraded Successor
successor cross-reference
successor
AN174-40Upgraded Successor
successor cross-reference
successor
AN174H40Upgraded Successor
successor cross-reference
successor
AN174H37Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN3DD21?
AN3DD21 is a BOLT,MACHINE.
What parts can replace AN3DD21?
There are 21 known substitutes for AN3DD21: AN173-21A, B6812, AN173H21A and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN3DD21?
AN3DD21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-150-9854. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026