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3970540 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

3970540: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL OVERALL, nut_style: INTERNAL OR EXTERNAL WRENCHING HEXAGON, locking_feature: PREVAILING TORQUE, thread_direction: RIGHT-HAND, nominal_thread_size: 0.44 INCHES IN, bearing_surface_type: FLAT. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-601-7397, 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
3970540
NSN: 5310-01-601-7397
NIINs: 016017397, 016087676, 016087713, 016093935, 016093954, 016109729, 016685304
FSC: 5310 — Nuts and Washers
CAGE: 45152 — OSHKOSH CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleINTERNAL OR EXTERNAL WRENCHING HEXAGON
locking_featurePREVAILING TORQUE
thread_directionRIGHT-HAND
nominal_thread_size0.44 INCHES IN
bearing_surface_typeFLAT
end_item_identification4219-01-622-0440
thread_quantity_per_inch14
part_name_assigned_by_controlling_agencyNUT, FLG, LKSP, TAB, G8
NSN5310-01-601-7397
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3970540 · 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
SUBSTITUTES & CROSS-REFERENCES 1
3970540002Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 3970540?
3970540 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 3970540?
There is 1 known substitute for 3970540: 3970540002. Substitute compatibility should be verified for your specific system.
What is the NSN for 3970540?
3970540 is cataloged in the U.S. Government catalog under NSN 5310-01-601-7397. 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.