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STSCA001B08 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

STSCA001B08: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.250 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN, material: STEEL OVERALL, hole_diameter: 0.315 INCHES MINIMUM AND 0.345 INCHES MAXIMUM IN, heat_treatment: AS FABRICATED, recess_diameter: 0.265 INCHES NOMINAL IN, outside_diameter: 0.464 INCHES MINIMUM AND 0.474 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-182-4101, 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
STSCA001B08
NSN: 5310-00-182-4101
FSC: 5310 — Nuts and Washers
CAGE: 98897 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
radius0.250 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
materialSTEEL OVERALL
hole_diameter0.315 INCHES MINIMUM AND 0.345 INCHES MAXIMUM IN
heat_treatmentAS FABRICATED
recess_diameter0.265 INCHES NOMINAL IN
outside_diameter0.464 INCHES MINIMUM AND 0.474 INCHES MAXIMUM IN
style_designatorCONCAVE
surface_treatmentCADMIUM OVERALL
material_thickness0.058 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
surface_treatment_document_and_classificationQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-182-4101
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: STSCA001B08 · 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 TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
RADIUS: 0.250 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
•
HEAT TREATMENT: AS FABRICATED
•
STYLE DESIGNATOR: CONCAVE
•
OUTSIDE DIAMETER: 0.464 INCHES MINIMUM AND 0.474 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.058 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.265 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
RADIUS0.250 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
HEAT TREATMENTAS FABRICATED
STYLE DESIGNATORCONCAVE
OUTSIDE DIAMETER0.464 INCHES MINIMUM AND 0.474 INCHES MAXIMUM IN
MATERIAL THICKNESS0.058 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
RECESS DIAMETER0.265 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL OVERALL
HOLE DIAMETER0.315 INCHES MINIMUM AND 0.345 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 1
55-2935-04Reference 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 STSCA001B08?
STSCA001B08 is a WASHER,CONCAVE.
What parts can replace STSCA001B08?
There is 1 known substitute for STSCA001B08: 55-2935-04. Substitute compatibility should be verified for your specific system.
What is the NSN for STSCA001B08?
STSCA001B08 is cataloged in the U.S. Government catalog under NSN 5310-00-182-4101. 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.