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A4K81 — NUT,PLAIN,BLIND RIVET

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

A4K81: NUT,PLAIN,BLIND RIVET.

The NUT,PLAIN,BLIND RIVET is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY OVERALL, nut_style: BLIND RIVET W/SMOOTH ROUND SHANK, head_style: FLAT COUNTERSUNK, nut_length: 0.355 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, nut_diameter: 0.151 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN, thread_class: 3B. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-984-1630, 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
A4K81
NSN: 5310-00-984-1630
FSC: 5310 — Nuts and Washers
CAGE: 03481 — BFGOODRICH CO THE AEROSPACE DIV ENGINEERED POLYMER PRODUCTS (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
nut_styleBLIND RIVET W/SMOOTH ROUND SHANK
head_styleFLAT COUNTERSUNK
nut_length0.355 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
nut_diameter0.151 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN
thread_class3B
head_diameter0.258 INCHES MINIMUM AND 0.268 INCHES MAXIMUM IN
thread_seriesUNIFIED NATIONAL COARSE (UNC)
shank_end_typeOPEN
thread_directionRIGHT-HAND
surface_treatmentANODIZE OVERALL
nominal_thread_size0.112 INCHES IN
NSN5310-00-984-1630
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A4K81 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
NUT LENGTH: 0.355 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
HEAD COUNTERSINK ANGLE: 100.00 DEGREES NOMINAL
•
SHANK END TYPE: OPEN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.112 INCHES IN
TECHNICAL CHARACTERISTICS
NUT LENGTH0.355 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
HEAD COUNTERSINK ANGLE100.00 DEGREES NOMINAL
SHANK END TYPEOPEN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.112 INCHES IN
NUT DIAMETER0.151 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN
SURFACE TREATMENTANODIZE OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
4AK81Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A4K81?
A4K81 is a NUT,PLAIN,BLIND RIVET.
What parts can replace A4K81?
There is 1 known substitute for A4K81: 4AK81. Substitute compatibility should be verified for your specific system.
What is the NSN for A4K81?
A4K81 is cataloged in the U.S. Government catalog under NSN 5310-00-984-1630. 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.