C7521-3-7 — BOLT,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

C7521-3-7: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP H11 OVERALL, head_style: SPLINE DRIVE SHEAR HEAD, grip_length: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN, head_height: 0.140 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.1885 INCHES MINIMUM AND 0.1894 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-233-8674, 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

C7521-3-7

NSN: 5306-01-233-8674
FSC: 5306 — Bolts
CAGE: 06725 — SPS TECHNOLOGIES, LLC DBA AIR INDUSTRIES COMPANY DIV AIR INDUSTRIES COMPANY (USA)

SPECIFICATIONS

material	STEEL COMP H11 OVERALL
head_style	SPLINE DRIVE SHEAR HEAD
grip_length	0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
head_height	0.140 INCHES NOMINAL IN
thread_class	3A A
grip_diameter	0.1885 INCHES MINIMUM AND 0.1894 INCHES MAXIMUM IN
thread_length	0.298 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
surface_finish	32.0 MICROINCHES THREADS
fastener_length	0.746 INCHES MINIMUM AND 0.776 INCHES MAXIMUM IN
hardness_rating	46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
thread_direction	RIGHT-HAND
features_provided	FINISHED HEAD
NSN	5306-01-233-8674

COMPONENT DIAGRAM

KEY FEATURES

•

SURFACE FINISH: 32.0 MICROINCHES THREADS

•

HEAD HEIGHT: 0.140 INCHES NOMINAL IN

•

FASTENER LENGTH: 0.746 INCHES MINIMUM AND 0.776 INCHES MAXIMUM IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL

•

THREAD LENGTH: 0.298 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN

•

HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL

TECHNICAL CHARACTERISTICS

SURFACE FINISH	32.0 MICROINCHES THREADS
SURFACE FINISH	32.0 MICROINCHES GRIP
SURFACE FINISH	32.0 MICROINCHES BEARING SURFACE OF HEAD
HEAD HEIGHT	0.140 INCHES NOMINAL IN
FASTENER LENGTH	0.746 INCHES MINIMUM AND 0.776 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH	0.298 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
HARDNESS RATING	46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER	0.190 INCHES IN

OTHER ITEMS IN FSC 5306 — Bolts

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017

SUBSTITUTES & CROSS-REFERENCES 8

PBF7521-3-7Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

H411-3-7Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

120978-3-7Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

5306PL1802975Reference document

Same NSN cross-reference

Reference document — Informative reference only

VCG0009-3-7Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

VS3133-3-7Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is C7521-3-7?

C7521-3-7 is a BOLT,CLOSE TOLERANCE.

What parts can replace C7521-3-7?

There are 8 known substitutes for C7521-3-7: PBF7521-3-7, H411-3-7, 120978-3-7 and 5 more. Substitute compatibility should be verified for your specific system.

What is the NSN for C7521-3-7?

C7521-3-7 is cataloged in the U.S. Government catalog under NSN 5306-01-233-8674. This indicates validated use in U.S. government and defense supply chains.

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