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A51G10553-19 — WASHER,KEYWAY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

A51G10553-19: WASHER,KEYWAY.

The WASHER,KEYWAY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 2.627 INCHES MINIMUM AND 2.630 INCHES MAXIMUM IN, hardness_rating: 46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM, surface_treatment: CADMIUM AND PAINT OVERALL, internal_keyway_width: 0.314 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN, minimum_tensile_strength: 220000 POUNDS PER SQUARE INCH LBS. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-474-7026, 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
A51G10553-19
NSN: 5310-00-474-7026
FSC: 5310 — Nuts and Washers
CAGE: 0BVP9 — CAPY MACHINE SHOP INC. DBA CAPY MACHINE SHOP INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter2.627 INCHES MINIMUM AND 2.630 INCHES MAXIMUM IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM
surface_treatmentCADMIUM AND PAINT OVERALL
internal_keyway_width0.314 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
minimum_tensile_strength220000 POUNDS PER SQUARE INCH LBS
material_document_and_classificationGSS5100,FSCM 26512 MFR REF SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyNAVY SPECIAL PROJECT
surface_treatment_document_and_classificationMIL-C-8837,TY 2,CL 1 MIL SPEC 1ST TREATMENT RESPONSE AND MIL-P-23377 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
distance_from_centerline_to_bottom_of_internal_keyway1.473 INCHES NOMINAL IN
NSN5310-00-474-7026
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A51G10553-19 · 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: 1.473 INCHES NOMINAL IN
•
INTERNAL KEYWAY WIDTH: 0.314 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-8837,TY 2,CL 1 MIL SPEC 1ST TREATMENT RESPONSE AND MIL-P-23377 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: GSS5100,FSCM 26512 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
COLOR: WHITE OVERALL
•
SURFACE TREATMENT: CADMIUM AND PAINT OVERALL
•
MINIMUM TENSILE STRENGTH: 220000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS
DISTANCE FROM CENTERLINE TO BOTTOM OF INTERNAL KEYWAY1.473 INCHES NOMINAL IN
INTERNAL KEYWAY WIDTH0.314 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-8837,TY 2,CL 1 MIL SPEC 1ST TREATMENT RESPONSE AND MIL-P-23377 MIL SPEC 2ND TREATMENT RESPONSE OVERALL
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONGSS5100,FSCM 26512 MFR REF SINGLE MATERIAL RESPONSE OVERALL
COLORWHITE OVERALL
SURFACE TREATMENTCADMIUM AND PAINT OVERALL
MINIMUM TENSILE STRENGTH220000 POUNDS PER SQUARE INCH LBS
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
MATERIALSTEEL 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 A51G10553-19?
A51G10553-19 is a WASHER,KEYWAY.
What is the NSN for A51G10553-19?
A51G10553-19 is cataloged in the U.S. Government catalog under NSN 5310-00-474-7026. 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.