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7986521 — WASHER,KEYWAY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

7986521: WASHER,KEYWAY.

The WASHER,KEYWAY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.730 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, heat_treatment: QUENCHED AND TEMPERED, surface_finish: 63.0 MICROINCHES BOTTOM, hardness_rating: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM, outside_diameter: 1.115 INCHES MINIMUM AND 1.120 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-916-2189, 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
7986521
NSN: 5310-00-916-2189
FSC: 5310 — Nuts and Washers
CAGE: 19206 — ARMY, UNITED STATES DEPARTMENT OF THE DBA WATERVLIET ARSENAL DIV BUSINESS DEVELOPMENT (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.730 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
heat_treatmentQUENCHED AND TEMPERED
surface_finish63.0 MICROINCHES BOTTOM
hardness_rating32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
outside_diameter1.115 INCHES MINIMUM AND 1.120 INCHES MAXIMUM IN
material_thickness0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
external_keyway_width0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
external_keyway_length0.085 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
NSN5310-00-916-2189
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 7986521 · 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
•
SURFACE FINISH: 63.0 MICROINCHES BOTTOM
•
EXTERNAL KEYWAY WIDTH: 0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
•
HEAT TREATMENT: QUENCHED AND TEMPERED
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
•
OUTSIDE DIAMETER: 1.115 INCHES MINIMUM AND 1.120 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES BOTTOM
SURFACE FINISH63.0 MICROINCHES TOP
EXTERNAL KEYWAY WIDTH0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
HEAT TREATMENTQUENCHED AND TEMPERED
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
OUTSIDE DIAMETER1.115 INCHES MINIMUM AND 1.120 INCHES MAXIMUM IN
MATERIAL THICKNESS0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.730 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
EXTERNAL KEYWAY LENGTH0.085 INCHES MINIMUM AND 0.100 INCHES MAXIMUM 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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 7986521?
7986521 is a WASHER,KEYWAY.
What is the NSN for 7986521?
7986521 is cataloged in the U.S. Government catalog under NSN 5310-00-916-2189. 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.