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Technical Data Sheet
PartsTable / COMPONENT / R20961
R20961 ✓ 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 1010 OR STEEL COMP 1020 OVERALL, thickness: 0.031 INCHES NOMINAL IN, hole_diameter: 1.130 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN, overall_diameter: 2.840 INCHES MINIMUM AND 2.850 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-769-6512, 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
R20961
NSN: 5310-00-769-6512
FSC: 5310
CAGE: 83120 — PRESSED METALS OF AMERICA INC (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OR STEEL COMP 1020 OVERALL
thickness0.031 INCHES NOMINAL IN
hole_diameter1.130 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
overall_diameter2.840 INCHES MINIMUM AND 2.850 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationW/S: HELICOPTER, ADVANCE ATTACK, AH-1W; AIRCRAFT, HORNET F/A-18; TA-4J AIRCRAFT; AIRCRAFT, HARRIER AV-8B; SUPPORT EQUIPMENT, B-1 AIRCRAFT; AIRCRAFT, PROWLER EA-6B W
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationSAE ASSN STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-769-6512
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: R20961 · 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 DOCUMENT AND CLASSIFICATION: SAE ASSN STD ALL MATERIAL RESPONSES OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 1010 OR STEEL COMP 1020 OVERALL
•
OVERALL DIAMETER: 2.840 INCHES MINIMUM AND 2.850 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
HOLE DIAMETER: 1.130 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD ALL MATERIAL RESPONSES OVERALL
CENTER HOLE SHAPE STYLEROUND
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL COMP 1010 OR STEEL COMP 1020 OVERALL
END ITEM IDENTIFICATIONW/S: HELICOPTER, ADVANCE ATTACK, AH-1W; AIRCRAFT, HORNET F/A-18; TA-4J AIRCRAFT; AIRCRAFT, HARRIER AV-8B; SUPPORT EQUIPMENT, B-1 AIRCRAFT; AIRCRAFT, PROWLER EA-6B W
OVERALL DIAMETER2.840 INCHES MINIMUM AND 2.850 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
HOLE DIAMETER1.130 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN
THICKNESS0.031 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
13575Interchangeable
interchangeable cross-reference
interchangeable
5325PL1029271Interchangeable
interchangeable cross-reference
interchangeable
933A-3SE0312Interchangeable
interchangeable cross-reference
interchangeable
15575Interchangeable
interchangeable cross-reference
interchangeable
4106214Interchangeable
interchangeable cross-reference
interchangeable
7575Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R20961?
R20961 is a WASHER,FLAT.
What parts can replace R20961?
There are 13 known substitutes for R20961: 13575, 5325PL1029271, 933A-3SE0312 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R20961?
R20961 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-769-6512. 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