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2129J90-1 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2129J90-1: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 410 OVERALL, hole_diameter: 1.560 INCHES NOMINAL IN, outside_diameter: 1.980 INCHES NOMINAL IN, style_designator: KEY, material_thickness: 0.060 INCHES NOMINAL IN, width_between_flats: 1.300 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-200-7799, 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
2129J90-1
NSN: 5310-01-200-7799
FSC: 5310 — Nuts and Washers
CAGE: 8FGX3 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORP DBA STEAM & AIR SOLUTIONS DIV CURTISS-WRIGHT STEAM AND AIR SOLUTIONS (USA)
SPECIFICATIONS
materialSTEEL COMP 410 OVERALL
hole_diameter1.560 INCHES NOMINAL IN
outside_diameter1.980 INCHES NOMINAL IN
style_designatorKEY
material_thickness0.060 INCHES NOMINAL IN
width_between_flats1.300 INCHES NOMINAL IN
external_key_quantity18
overall_distance_including_keys2.620 INCHES NOMINAL IN
material_document_and_classificationMIL-S-861 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-200-7799
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2129J90-1 · 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
•
OVERALL DISTANCE INCLUDING KEYS: 2.620 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-861 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 1.980 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.060 INCHES NOMINAL IN
•
WIDTH BETWEEN FLATS: 1.300 INCHES NOMINAL IN
•
EXTERNAL KEY QUANTITY: 18
•
MATERIAL: STEEL COMP 410 OVERALL
TECHNICAL CHARACTERISTICS
OVERALL DISTANCE INCLUDING KEYS2.620 INCHES NOMINAL IN
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-861 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER1.980 INCHES NOMINAL IN
MATERIAL THICKNESS0.060 INCHES NOMINAL IN
WIDTH BETWEEN FLATS1.300 INCHES NOMINAL IN
EXTERNAL KEY QUANTITY18
MATERIALSTEEL COMP 410 OVERALL
HOLE DIAMETER1.560 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
2129J90 PIECE 1Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2129J90-1?
2129J90-1 is a WASHER,KEY.
What parts can replace 2129J90-1?
There is 1 known substitute for 2129J90-1: 2129J90 PIECE 1. Substitute compatibility should be verified for your specific system.
What is the NSN for 2129J90-1?
2129J90-1 is cataloged in the U.S. Government catalog under NSN 5310-01-200-7799. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.