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PartsTable / COMPONENT / 98025A133
98025A133 ✓ 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 OVERALL, thickness: 0.153 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN, hole_diameter: 0.526 INCHES NOMINAL IN, hardness_rating: 43.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM, overall_diameter: 1.092 INCHES NOMINAL IN, surface_treatment: ZINC OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-435-8312, 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
98025A133
NSN: 5310-01-435-8312
FSC: 5310
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.153 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN
hole_diameter0.526 INCHES NOMINAL IN
hardness_rating43.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM
overall_diameter1.092 INCHES NOMINAL IN
surface_treatmentZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-01-435-8312
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 98025A133 · 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
•
CENTER HOLE SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: ZINC OVERALL
•
HOLE DIAMETER: 0.526 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OVERALL DIAMETER: 1.092 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
HARDNESS RATING: 43.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE SHAPE STYLEROUND
MATERIALSTEEL OVERALL
SURFACE TREATMENTZINC OVERALL
HOLE DIAMETER0.526 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OVERALL DIAMETER1.092 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
HARDNESS RATING43.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM
THICKNESS0.153 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
3257Interchangeable
interchangeable cross-reference
interchangeable
3257-00Interchangeable
interchangeable cross-reference
interchangeable
USAF325-7Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEA2Interchangeable
interchangeable cross-reference
interchangeable
172-377Interchangeable
interchangeable cross-reference
interchangeable
FD28851Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 98025A133?
98025A133 is a WASHER,FLAT.
What parts can replace 98025A133?
There are 11 known substitutes for 98025A133: 3257, 3257-00, USAF325-7 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 98025A133?
98025A133 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-435-8312. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026