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QA8US ✓ 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: 0.125 INCHES NOMINAL IN, hole_diameter: 1.391 INCHES NOMINAL IN, hardness_rating: 47.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM, overall_diameter: 2.500 INCHES NOMINAL IN, features_provided: CASEHARDENED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-682-5585, 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
QA8US
NSN: 5310-00-682-5585
FSC: 5310
CAGE: 61465 — GARWOOD/FELLER INC GARWOOD WINCH DIV (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.125 INCHES NOMINAL IN
hole_diameter1.391 INCHES NOMINAL IN
hardness_rating47.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM
overall_diameter2.500 INCHES NOMINAL IN
features_providedCASEHARDENED
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-682-5585
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: QA8US · 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
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 1.391 INCHES NOMINAL IN
•
HARDNESS RATING: 47.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM
•
THICKNESS: 0.125 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
OVERALL DIAMETER: 2.500 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MATERIALSTEEL OVERALL
HOLE DIAMETER1.391 INCHES NOMINAL IN
HARDNESS RATING47.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM
THICKNESS0.125 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
OVERALL DIAMETER2.500 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
FEATURES PROVIDEDCASEHARDENED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
807711Interchangeable
interchangeable cross-reference
interchangeable
32101Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is QA8US?
QA8US is a WASHER,FLAT.
What parts can replace QA8US?
There are 2 known substitutes for QA8US: 807711, 32101. Substitute compatibility should be verified for your specific system.
What is the NSN for QA8US?
QA8US is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-682-5585. 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