PartsTable
Technical Data Sheet
PartsTable / COMPONENT / AN21-24
AN21-24 ✓ 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,CLEVIS is a the manufacturer industrial component. Key specifications include head_style: BUTTON, head_height: 0.078 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.312 INCHES NOMINAL IN, thread_length: 0.231 INCHES NOMINAL IN, fastener_length: 1.531 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-151-0511, 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
AN21-24
NSN: 5306-00-151-0511
FSC: 5306
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
head_styleBUTTON
head_height0.078 INCHES NOMINAL IN
thread_class3A A
head_diameter0.312 INCHES NOMINAL IN
thread_length0.231 INCHES NOMINAL IN
fastener_length1.531 INCHES NOMINAL IN
groove_diameter0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
internal_drive_styleSLOT
NSN5306-00-151-0511
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN21-24 · 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: 0.078 INCHES NOMINAL IN
•
THREAD LENGTH: 0.231 INCHES NOMINAL IN
•
GROOVE DIAMETER: 0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
MINIMUM TENSILE STRENGTH: 125000 POUNDS PER SQUARE INCH LBS
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-650 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 5TH MATERIAL RESPONSE OR AMS 6300 ASSN STD 6TH MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.078 INCHES NOMINAL IN
THREAD LENGTH0.231 INCHES NOMINAL IN
GROOVE DIAMETER0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN
MATERIALSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH LBS
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-650 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 5TH MATERIAL RESPONSE OR AMS 6300 ASSN STD 6TH MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD DIAMETER0.138 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
AN182-26Upgraded Successor
successor cross-reference
successor
B6812Upgraded Successor
successor cross-reference
successor
AN182H26Upgraded Successor
successor cross-reference
successor
AN173-10Upgraded Successor
successor cross-reference
successor
83-10Upgraded Successor
successor cross-reference
successor
NASM6812Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN21-24?
AN21-24 is a BOLT,CLEVIS.
What parts can replace AN21-24?
There are 11 known substitutes for AN21-24: AN182-26, B6812, AN182H26 and 8 more. Substitute compatibility should be verified for your specific system.
Is AN21-24 still available?
AN21-24 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026