PartsTable
Technical Data Sheet
PartsTable / COMPONENT / R21163
R21163 ✓ 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,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1020 OVERALL, hole_diameter: 1.641 INCHES MINIMUM AND 1.656 INCHES MAXIMUM IN, outside_diameter: 2.531 INCHES MINIMUM AND 2.625 INCHES MAXIMUM IN, style_designator: KEY, material_thickness: 0.0498 INCHES MINIMUM AND 0.0698 INCHES MAXIMUM IN, internal_prebent_key_width: 0.224 INCHES MINIMUM AND 0.244 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-769-6521, 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
R21163
NSN: 5310-00-769-6521
FSC: 5310
CAGE: 83120 — PRESSED METALS OF AMERICA INC (USA)
SPECIFICATIONS
materialSTEEL COMP 1020 OVERALL
hole_diameter1.641 INCHES MINIMUM AND 1.656 INCHES MAXIMUM IN
outside_diameter2.531 INCHES MINIMUM AND 2.625 INCHES MAXIMUM IN
style_designatorKEY
material_thickness0.0498 INCHES MINIMUM AND 0.0698 INCHES MAXIMUM IN
internal_prebent_key_width0.224 INCHES MINIMUM AND 0.244 INCHES MAXIMUM IN
internal_prebent_key_length0.1225 INCHES MINIMUM AND 0.1425 INCHES MAXIMUM IN
material_document_and_classificationSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_inside_of_prebent_key0.672 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN
NSN5310-00-769-6521
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: R21163 · 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
•
STYLE DESIGNATOR: KEY
•
MATERIAL: STEEL COMP 1020 OVERALL
•
INTERNAL PREBENT KEY WIDTH: 0.224 INCHES MINIMUM AND 0.244 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.0498 INCHES MINIMUM AND 0.0698 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
HOLE DIAMETER: 1.641 INCHES MINIMUM AND 1.656 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 2.531 INCHES MINIMUM AND 2.625 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORKEY
MATERIALSTEEL COMP 1020 OVERALL
INTERNAL PREBENT KEY WIDTH0.224 INCHES MINIMUM AND 0.244 INCHES MAXIMUM IN
MATERIAL THICKNESS0.0498 INCHES MINIMUM AND 0.0698 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
HOLE DIAMETER1.641 INCHES MINIMUM AND 1.656 INCHES MAXIMUM IN
OUTSIDE DIAMETER2.531 INCHES MINIMUM AND 2.625 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONW/S: AIRCRAFT, T-39; HELICOPTER, IROQUOIS UH-1; HELICOPTER, APACHE AH-64; HELICOPTER, KIOWA OH-58 A&C; HELICOPTER, OBSERVATION (AHIP), OH-58D; HELICOPTER, BLACK HAWK UH-60A; HELICOPTER, ELECTRONIC COUNTERMEASURES, EH-60A; TRUCK, FIRE/CRASH P2; HELICOPTER, CHINOOK, CH-47; HELICOPTER, COBRA/TOW, AH SERIES A
INTERNAL PREBENT KEY LENGTH0.1225 INCHES MINIMUM AND 0.1425 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.672 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
170-17Interchangeable
interchangeable cross-reference
interchangeable
35GInterchangeable
interchangeable cross-reference
interchangeable
587AS140-1Interchangeable
interchangeable cross-reference
interchangeable
10162991-1Interchangeable
interchangeable cross-reference
interchangeable
A867Interchangeable
interchangeable cross-reference
interchangeable
A-2430Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy R21163?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is R21163?
R21163 is a WASHER,KEY.
What parts can replace R21163?
There are 18 known substitutes for R21163: 170-17, 35G, 587AS140-1 and 15 more. Substitute compatibility should be verified for your specific system.
Is R21163 still available?
R21163 is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — R21163

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026