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PBF7521-8DN25 — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

PBF7521-8DN25: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: SPLINE DRIVE SHEAR HEAD, grip_length: 1.552 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN, head_height: 0.281 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.4982 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-060-6843, 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
PBF7521-8DN25
NSN: 5306-01-060-6843
FSC: 5306 — Bolts
CAGE: 27624 — SPS TECHNOLOGIES LLC DBA PB FASTENERS DIV PB FASTENERS (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleSPLINE DRIVE SHEAR HEAD
grip_length1.552 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN
head_height0.281 INCHES NOMINAL IN
thread_class3A A
grip_diameter0.4982 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM IN
thread_length0.528 INCHES NOMINAL IN
fastener_length2.080 INCHES MINIMUM AND 2.100 INCHES MAXIMUM IN
special_featuresDRY FILM LUBE PER MIL-L-8937B ON BEARING SURFACE OF HEAD AND GRIP
thread_directionRIGHT-HAND
surface_treatmentCADMIUM THREADS
width_between_flats0.901 INCHES MAXIMUM IN
NSN5306-01-060-6843
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: PBF7521-8DN25 · 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: 0.281 INCHES NOMINAL IN
•
FASTENER LENGTH: 2.080 INCHES MINIMUM AND 2.100 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: NAS672 NATIONAL SPEC SINGLE TREATMENT RESPONSE THREADS
•
THREAD LENGTH: 0.528 INCHES NOMINAL IN
•
SHANK UNTHREADED HOLE DIAMETER: 0.106 INCHES NOMINAL FIRST HOLE IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.281 INCHES NOMINAL IN
FASTENER LENGTH2.080 INCHES MINIMUM AND 2.100 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONNAS672 NATIONAL SPEC SINGLE TREATMENT RESPONSE THREADS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONNAS672 NATIONAL SPEC SINGLE TREATMENT RESPONSE TOP OF HEAD
THREAD LENGTH0.528 INCHES NOMINAL IN
SHANK UNTHREADED HOLE DIAMETER0.106 INCHES NOMINAL FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.500 INCHES IN
HEAD STYLESPLINE DRIVE SHEAR HEAD
THREAD DIRECTIONRIGHT-HAND
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 6
VS3133-8DN25Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
H411-8DN25Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
C7521-8DN25Reference document
Same NSN cross-reference
Reference document — Secondary reference
SF118-8DN25Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
120978-8D25NSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
AIC596-8DN25Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is PBF7521-8DN25?
PBF7521-8DN25 is a BOLT,CLOSE TOLERANCE.
What parts can replace PBF7521-8DN25?
There are 6 known substitutes for PBF7521-8DN25: VS3133-8DN25, H411-8DN25, C7521-8DN25 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for PBF7521-8DN25?
PBF7521-8DN25 is cataloged in the U.S. Government catalog under NSN 5306-01-060-6843. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.