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KFN631-3 — NUT,SELF-LOCKING

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

KFN631-3: NUT,SELF-LOCKING.

The NUT,SELF-LOCKING is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5310-01-065-6971, 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
KFN631-3
NSN: 5310-01-065-6971
FSC: 5310 — Nuts and Washers
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
Part NumberKFN631-3
NSN5310-01-065-6971
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: KFN631-3 · 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
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: 0.190-32 UNJF-3B RH THREAD,NUT ALUMINUM ALLOY 7075 TEMPER T73,SEAL PLASTIC MIL-P-19468,NUT ANODIZED MIL-A-8625 TYPE 2 CLASS 2,SOLUBLE LUBRICANT,0.348 IN. MAX WASHER OUTSIDE DIA,0.260 IN.MAX HEIGHT OF NUT,0.102 IN. MIN AND 0.112 IN. MAX COUNTERBORE DEPTH,0.203 IN. MAX COUNTERBORE DIA,PREVAILING TORQUE ALL METAL LOCKING FEATURE,SPLINE TYPE WRENCHING FEATURE,250 DEG F TEMP RATING IN
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTION0.190-32 UNJF-3B RH THREAD,NUT ALUMINUM ALLOY 7075 TEMPER T73,SEAL PLASTIC MIL-P-19468,NUT ANODIZED MIL-A-8625 TYPE 2 CLASS 2,SOLUBLE LUBRICANT,0.348 IN. MAX WASHER OUTSIDE DIA,0.260 IN.MAX HEIGHT OF NUT,0.102 IN. MIN AND 0.112 IN. MAX COUNTERBORE DEPTH,0.203 IN. MAX COUNTERBORE DIA,PREVAILING TORQUE ALL METAL LOCKING FEATURE,SPLINE TYPE WRENCHING FEATURE,250 DEG F TEMP RATING IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is KFN631-3?
KFN631-3 is a NUT,SELF-LOCKING.
What is the NSN for KFN631-3?
KFN631-3 is cataloged in the U.S. Government catalog under NSN 5310-01-065-6971. 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.