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MKC-140 — NUT,PLAIN,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

MKC-140: NUT,PLAIN,HEXAGON.

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, nut_height: 0.340 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN, width_across_flats: 0.328 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN, bearing_surface_type: CHAMFERED OR WASHER FACED. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-416-5252, 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
MKC-140
NSN: 5310-01-416-5252
FSC: 5310 — Nuts and Washers
CAGE: 30634 — BESWICK ENGINEERING CO INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_height0.340 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN
width_across_flats0.328 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
bearing_surface_typeCHAMFERED OR WASHER FACED
NSN5310-01-416-5252
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MKC-140 · 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
•
WIDTH ACROSS FLATS: 0.328 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
•
NUT HEIGHT: 0.340 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY OVERALL
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.328 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
NUT HEIGHT0.340 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY OVERALL
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
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 1
3307366-1Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
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 MKC-140?
MKC-140 is a NUT,PLAIN,HEXAGON.
What parts can replace MKC-140?
There is 1 known substitute for MKC-140: 3307366-1. Substitute compatibility should be verified for your specific system.
What is the NSN for MKC-140?
MKC-140 is cataloged in the U.S. Government catalog under NSN 5310-01-416-5252. 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.