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D31957 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

D31957: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN, hole_diameter: 0.646 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN, overall_diameter: 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN, surface_treatment: CADMIUM OR ZINC OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-440-3029, 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
D31957
NSN: 5310-00-440-3029
FSC: 5310 — Nuts and Washers
CAGE: 10988 — CNH INDUSTRIAL AMERICA LLC DBA CNH AMERICA (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
hole_diameter0.646 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN
overall_diameter1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
surface_treatmentCADMIUM OR ZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-440-3029
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: D31957 · 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
•
OVERALL DIAMETER: 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.646 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN
•
THICKNESS: 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.646 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN
THICKNESS0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 2
B1733Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
X144-3Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is D31957?
D31957 is a WASHER,FLAT.
What parts can replace D31957?
There are 2 known substitutes for D31957: B1733, X144-3. Substitute compatibility should be verified for your specific system.
What is the NSN for D31957?
D31957 is cataloged in the U.S. Government catalog under NSN 5310-00-440-3029. 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.