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7986520 — WASHER,KEYWAY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

7986520: WASHER,KEYWAY.

The WASHER,KEYWAY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340 OVERALL, hole_diameter: 1.630 INCHES MINIMUM AND 1.640 INCHES MAXIMUM IN, hardness_rating: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM, outside_diameter: 2.070 INCHES MINIMUM AND 2.090 INCHES MAXIMUM IN, surface_treatment: OXIDE FILM OVERALL, material_thickness: 0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-916-2188, 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
7986520
NSN: 5310-00-916-2188
FSC: 5310 — Nuts and Washers
CAGE: 19206 — ARMY, UNITED STATES DEPARTMENT OF THE DBA WATERVLIET ARSENAL DIV BUSINESS DEVELOPMENT (USA)
SPECIFICATIONS
materialSTEEL COMP 4340 OVERALL
hole_diameter1.630 INCHES MINIMUM AND 1.640 INCHES MAXIMUM IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
outside_diameter2.070 INCHES MINIMUM AND 2.090 INCHES MAXIMUM IN
surface_treatmentOXIDE FILM OVERALL
material_thickness0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
internal_keyway_width0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
internal_keyway_quantity1
material_document_and_classificationQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OR AMS 6415 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-C-13924 CL 1 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 2485 ASSN STD 2ND TREATMENT RESPONSE OVERALL
distance_from_centerline_to_bottom_of_internal_keyway0.905 INCHES MINIMUM AND 0.920 INCHES MAXIMUM IN
NSN5310-00-916-2188
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 7986520 · 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
•
DISTANCE FROM CENTERLINE TO BOTTOM OF INTERNAL KEYWAY: 0.905 INCHES MINIMUM AND 0.920 INCHES MAXIMUM IN
•
INTERNAL KEYWAY WIDTH: 0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-13924 CL 1 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 2485 ASSN STD 2ND TREATMENT RESPONSE OVERALL
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OR AMS 6415 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 2.070 INCHES MINIMUM AND 2.090 INCHES MAXIMUM IN
•
INTERNAL KEYWAY QUANTITY: 1
•
MATERIAL THICKNESS: 0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
DISTANCE FROM CENTERLINE TO BOTTOM OF INTERNAL KEYWAY0.905 INCHES MINIMUM AND 0.920 INCHES MAXIMUM IN
INTERNAL KEYWAY WIDTH0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-13924 CL 1 MIL SPEC 1ST TREATMENT RESPONSE OR AMS 2485 ASSN STD 2ND TREATMENT RESPONSE OVERALL
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OR AMS 6415 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER2.070 INCHES MINIMUM AND 2.090 INCHES MAXIMUM IN
INTERNAL KEYWAY QUANTITY1
MATERIAL THICKNESS0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
SURFACE TREATMENTOXIDE FILM OVERALL
MATERIALSTEEL COMP 4340 OVERALL
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 7986520?
7986520 is a WASHER,KEYWAY.
What is the NSN for 7986520?
7986520 is cataloged in the U.S. Government catalog under NSN 5310-00-916-2188. 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.