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VS2521F4-8 — BOLT,SHEAR

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

VS2521F4-8: BOLT,SHEAR.

The BOLT,SHEAR is a the manufacturer industrial component. Key specifications include material: STEEL OR STEEL COMP H11 OVERALL, head_style: DOUBLE HEXAGON, grip_length: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN, head_height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-876-1391, 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
VS2521F4-8
NSN: 5306-00-876-1391
FSC: 5306 — Bolts
CAGE: 06950 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
materialSTEEL OR STEEL COMP H11 OVERALL
head_styleDOUBLE HEXAGON
grip_length0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
head_height0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN
thread_length0.273 INCHES MINIMUM AND 0.334 INCHES MAXIMUM IN
fastener_length0.783 INCHES MINIMUM AND 0.824 INCHES MAXIMUM IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_between_flats0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
NSN5306-00-876-1391
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: VS2521F4-8 · 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: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.783 INCHES MINIMUM AND 0.824 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: NAS672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.273 INCHES MINIMUM AND 0.334 INCHES MAXIMUM IN
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SPS-M-107 FSCM 56878 MFR REF 1ST MATERIAL RESPONSE OR AMS6485 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: DOUBLE HEXAGON
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN
FASTENER LENGTH0.783 INCHES MINIMUM AND 0.824 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONNAS672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.273 INCHES MINIMUM AND 0.334 INCHES MAXIMUM IN
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSPS-M-107 FSCM 56878 MFR REF 1ST MATERIAL RESPONSE OR AMS6485 ASSN STD 2ND MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEDOUBLE HEXAGON
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 6
EWSB22-4A8Reference document
Same NSN cross-reference
Reference document — Secondary reference
AIC220-4A8Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
C081-4-8Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
202-15520-4-8Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
BM55132-4-8AReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
GB511B4-8Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is VS2521F4-8?
VS2521F4-8 is a BOLT,SHEAR.
What parts can replace VS2521F4-8?
There are 6 known substitutes for VS2521F4-8: EWSB22-4A8, AIC220-4A8, C081-4-8 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for VS2521F4-8?
VS2521F4-8 is cataloged in the U.S. Government catalog under NSN 5306-00-876-1391. 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.