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Technical Data Sheet
PartsTable / COMPONENT / 7521949
7521949 ✓ 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,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8635 OR STEEL COMP 8637 OR STEEL COMP 8640 OR STEEL COMP 3135 OVERALL, head_style: ROUND W/WRENCH FLATS, head_height: 0.250 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.688 INCHES NOMINAL IN, thread_length: 0.750 INCHES MINIMUM 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 5306-00-752-1949, 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
7521949
NSN: 5306-00-752-1949
FSC: 5306
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL COMP 8635 OR STEEL COMP 8637 OR STEEL COMP 8640 OR STEEL COMP 3135 OVERALL
head_styleROUND W/WRENCH FLATS
head_height0.250 INCHES NOMINAL IN
thread_class3A A
head_diameter0.688 INCHES NOMINAL IN
thread_length0.750 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length2.938 INCHES NOMINAL IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length1.156 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.4450 INCHES MINIMUM AND 0.4460 INCHES MAXIMUM FIRST SHOULDER IN
NSN5306-00-752-1949
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 7521949 · 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
•
WIDTH BETWEEN FLATS: 0.460 INCHES MINIMUM AND 0.480 INCHES MAXIMUM IN
•
THREAD SERIES DESIGNATOR: UNF
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
HEAD HEIGHT: 0.250 INCHES NOMINAL IN
•
FASTENER LENGTH: 2.938 INCHES NOMINAL IN
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD LENGTH: 0.750 INCHES MINIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH BETWEEN FLATS0.460 INCHES MINIMUM AND 0.480 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNF
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC ALL MATERIAL RESPONSES OVERALL
HEAD HEIGHT0.250 INCHES NOMINAL IN
FASTENER LENGTH2.938 INCHES NOMINAL IN
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM OVERALL
THREAD LENGTH0.750 INCHES MINIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
NOMINAL THREAD DIAMETER0.438 INCHES IN
MATERIALSTEEL COMP 8635 OR STEEL COMP 8637 OR STEEL COMP 8640 OR STEEL COMP 3135 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
913-357Interchangeable
interchangeable cross-reference
interchangeable
913-0357Interchangeable
interchangeable cross-reference
interchangeable
997A3Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 7521949?
7521949 is a BOLT,SHOULDER.
What parts can replace 7521949?
There are 3 known substitutes for 7521949: 913-357, 913-0357, 997A3. Substitute compatibility should be verified for your specific system.
What is the NSN for 7521949?
7521949 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-752-1949. 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