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12NC4248-1-40 — NUT,SELF-LOCKING,SPLINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12NC4248-1-40: NUT,SELF-LOCKING,SPLINE.

The NUT,SELF-LOCKING,SPLINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL EXCEPT INSERT, nut_style: SPLINE (FLOATING), nut_height: 0.175 INCHES MAXIMUM IN, nut_length: 0.446 INCHES MAXIMUM IN, pilot_length: 0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM IN, thread_class: 3B. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-206-5183, 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
12NC4248-1-40
NSN: 5310-01-206-5183
FSC: 5310 — Nuts and Washers
CAGE: 72962 — HARVARD INDUSTRIES INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL EXCEPT INSERT
nut_styleSPLINE (FLOATING)
nut_height0.175 INCHES MAXIMUM IN
nut_length0.446 INCHES MAXIMUM IN
pilot_length0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
pilot_diameter0.222 INCHES MINIMUM AND 0.227 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
features_providedFLOATING NUT
surface_treatmentCADMIUM OVERALL EXCEPT INSERT
NSN5310-01-206-5183
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12NC4248-1-40 · 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: 0.300 INCHES NOMINAL IN
•
NUT LENGTH: 0.446 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NUT COUNTERBORE DEPTH: 0.062 INCHES NOMINAL FIRST END IN
•
FEATURES PROVIDED: FLOATING NUT
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.112 INCHES IN
•
COUNTERBORE DIAMETER: 0.175 INCHES MINIMUM AND 0.185 INCHES MAXIMUM FIRST END IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.300 INCHES NOMINAL IN
NUT LENGTH0.446 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NUT COUNTERBORE DEPTH0.062 INCHES NOMINAL FIRST END IN
FEATURES PROVIDEDFLOATING NUT
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.112 INCHES IN
COUNTERBORE DIAMETER0.175 INCHES MINIMUM AND 0.185 INCHES MAXIMUM FIRST END IN
PILOT DIAMETER0.222 INCHES MINIMUM AND 0.227 INCHES MAXIMUM IN
PILOT LENGTH0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM 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 1
588616-3Reference 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 12NC4248-1-40?
12NC4248-1-40 is a NUT,SELF-LOCKING,SPLINE.
What parts can replace 12NC4248-1-40?
There is 1 known substitute for 12NC4248-1-40: 588616-3. Substitute compatibility should be verified for your specific system.
What is the NSN for 12NC4248-1-40?
12NC4248-1-40 is cataloged in the U.S. Government catalog under NSN 5310-01-206-5183. 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.