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PartsTable / COMPONENT / NASM21 THRU NASM37
NASM21 THRU NASM37 ✓ 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: 0.188 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.688 INCHES NOMINAL IN, thread_length: 0.359 INCHES NOMINAL IN, fastener_length: 1.234 INCHES NOMINAL 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 5306-00-151-0531, 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
NASM21 THRU NASM37
NSN: 5306-00-151-0531
FSC: 5306
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 8630 OR STEEL COMP 4037 OVERALL
head_styleBUTTON
head_height0.188 INCHES NOMINAL IN
thread_class3A A
head_diameter0.688 INCHES NOMINAL IN
thread_length0.359 INCHES NOMINAL IN
fastener_length1.234 INCHES NOMINAL IN
groove_diameter0.062 INCHES NOMINAL 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
NSN5306-00-151-0531
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: NASM21 THRU NASM37 · 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
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
•
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER: 1.672 INCHES MINIMUM AND 1.703 INCHES MAXIMUM FIRST HOLE IN
•
INTERNAL DRIVE STYLE: SLOT
•
MINIMUM TENSILE STRENGTH: 125000 POUNDS PER SQUARE INCH LBS
•
THREAD LENGTH: 0.636 INCHES MINIMUM AND 0.676 INCHES MAXIMUM IN
•
THREAD SERIES DESIGNATOR: UNF
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6050 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)
NOMINAL THREAD DIAMETER0.250 INCHES IN
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER1.672 INCHES MINIMUM AND 1.703 INCHES MAXIMUM FIRST HOLE IN
INTERNAL DRIVE STYLESLOT
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH LBS
THREAD LENGTH0.636 INCHES MINIMUM AND 0.676 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNF
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6050 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
MATERIALSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
NASM6812Interchangeable
interchangeable cross-reference
interchangeable
NASM21 THRU NASM37Interchangeable
interchangeable cross-reference
interchangeable
AN24-40AInterchangeable
interchangeable cross-reference
interchangeable
AN24-62AInterchangeable
interchangeable cross-reference
interchangeable
B107.39 TY2CL1Interchangeable
interchangeable cross-reference
interchangeable
DA22Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NASM21 THRU NASM37?
NASM21 THRU NASM37 is a BOLT,CLEVIS.
What parts can replace NASM21 THRU NASM37?
There are 12 known substitutes for NASM21 THRU NASM37: NASM6812, NASM21 THRU NASM37, AN24-40A and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NASM21 THRU NASM37?
NASM21 THRU NASM37 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-151-0531. 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