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951A4 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: LEATHER OVERALL, thickness: 0.125 INCHES NOMINAL IN, hole_diameter: 0.625 INCHES NOMINAL IN, overall_diameter: 1.188 INCHES NOMINAL IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-753-8631, 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
951A4
NSN: 5310-00-753-8631
FSC: 5310
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialLEATHER OVERALL
thickness0.125 INCHES NOMINAL IN
hole_diameter0.625 INCHES NOMINAL IN
overall_diameter1.188 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-753-8631
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 951A4 · 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
•
PERIPHERAL SHAPE STYLE: ROUND
•
THICKNESS: 0.125 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.625 INCHES NOMINAL IN
•
MATERIAL: LEATHER OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OVERALL DIAMETER: 1.188 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
PERIPHERAL SHAPE STYLEROUND
THICKNESS0.125 INCHES NOMINAL IN
HOLE DIAMETER0.625 INCHES NOMINAL IN
MATERIALLEATHER OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OVERALL DIAMETER1.188 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
91-3585Interchangeable
interchangeable cross-reference
interchangeable
S9531-DW-MMC-010 7-16 INDEX 12Interchangeable
interchangeable cross-reference
interchangeable
S9531-DW-MMC-010Interchangeable
interchangeable cross-reference
interchangeable
7538631Interchangeable
Same NIIN cross-reference
interchangeable
RC873A4Interchangeable
Same NIIN cross-reference
interchangeable
873A4Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 951A4?
951A4 is a WASHER,FLAT.
What parts can replace 951A4?
There are 6 known substitutes for 951A4: 91-3585, S9531-DW-MMC-010 7-16 INDEX 12, S9531-DW-MMC-010 and 3 more. Substitute compatibility should be verified for your specific system.
Is 951A4 still available?
951A4 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026