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14037991 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

14037991: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL COMP 1035 OR STEEL COMP 1038 OR STEEL COMP 1045 OVERALL, nut_style: HEXAGON, thread_class: 2B, thread_series: UNEF, overall_height: 0.627 INCHES MINIMUM AND 0.675 INCHES MAXIMUM IN, hardness_rating: 26.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-148-0245, 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
14037991
NSN: 5310-01-148-0245
FSC: 5310 — Nuts and Washers
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 1035 OR STEEL COMP 1038 OR STEEL COMP 1045 OVERALL
nut_styleHEXAGON
thread_class2B
thread_seriesUNEF
overall_height0.627 INCHES MINIMUM AND 0.675 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
countersink_angle90.0 DEGREES NOMINAL WASHER
surface_treatmentCADMIUM OVERALL
width_across_flats1.088 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
NSN5310-01-148-0245
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 14037991 · 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
•
WASHER OUTSIDE DIAMETER: 1.450 INCHES MINIMUM AND 1.585 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 1.088 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: P.S.-132,CODE 50,PS.-1207 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNEF
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
•
WASHER THICKNESS: 0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD ALL MATERIAL RESPONSES OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.627 INCHES MINIMUM AND 0.675 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER1.450 INCHES MINIMUM AND 1.585 INCHES MAXIMUM IN
WIDTH ACROSS FLATS1.088 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONP.S.-132,CODE 50,PS.-1207 MFR REF SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNEF
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
WASHER THICKNESS0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD ALL MATERIAL RESPONSES OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.875 INCHES 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 14037991?
14037991 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What is the NSN for 14037991?
14037991 is cataloged in the U.S. Government catalog under NSN 5310-01-148-0245. 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.