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PartsTable / COMPONENT / SS2-31
SS2-31 ✓ 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: STEEL COMP 303 OVERALL, thickness: 0.029 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN, hole_diameter: 0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN, overall_diameter: 0.375 INCHES NOMINAL IN, surface_treatment: PASSIVATE OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-584-7151, 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
SS2-31
NSN: 5310-00-584-7151
FSC: 5310
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
thickness0.029 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
hole_diameter0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
overall_diameter0.375 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-584-7151
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SS2-31 · 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
•
MATERIAL: STEEL COMP 302 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
OVERALL DIAMETER: 0.375 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
THICKNESS: 0.031 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 302 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
OVERALL DIAMETER0.375 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
THICKNESS0.031 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
HOLE DIAMETER0.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
B88Interchangeable
interchangeable cross-reference
interchangeable
1F4622Interchangeable
interchangeable cross-reference
interchangeable
354080Interchangeable
interchangeable cross-reference
interchangeable
942532Interchangeable
interchangeable cross-reference
interchangeable
111PC2-20Interchangeable
interchangeable cross-reference
interchangeable
7036787Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SS2-31?
SS2-31 is a WASHER,FLAT.
What parts can replace SS2-31?
There are 20 known substitutes for SS2-31: B88, 1F4622, 354080 and 17 more. Substitute compatibility should be verified for your specific system.
Is SS2-31 still available?
SS2-31 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