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U31608-01 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

U31608-01: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.405 INCHES MINIMUM AND 0.412 INCHES MAXIMUM IN, heat_treatment: AS FABRICATED, recess_diameter: 0.750 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN, style_designator: RECESSED, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-087-4908, 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
U31608-01
NSN: 5310-00-087-4908
FSC: 5310 — Nuts and Washers
CAGE: 07703 — ATK LAUNCH SYSTEMS LLC DBA ATK LAUNCH SYSTEMS-PROMONTORY DIV PROPULSION SYSTEMS - PROMONTORY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.405 INCHES MINIMUM AND 0.412 INCHES MAXIMUM IN
heat_treatmentAS FABRICATED
recess_diameter0.750 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
style_designatorRECESSED
surface_treatmentPASSIVATE OVERALL
material_thickness0.208 INCHES MINIMUM AND 0.228 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-087-4908
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: U31608-01 · 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
•
HEAT TREATMENT: AS FABRICATED
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL THICKNESS: 0.208 INCHES MINIMUM AND 0.228 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.750 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.405 INCHES MINIMUM AND 0.412 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAT TREATMENTAS FABRICATED
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIAL THICKNESS0.208 INCHES MINIMUM AND 0.228 INCHES MAXIMUM IN
RECESS DIAMETER0.750 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL OVERALL
HOLE DIAMETER0.405 INCHES MINIMUM AND 0.412 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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is U31608-01?
U31608-01 is a WASHER,RECESSED.
What is the NSN for U31608-01?
U31608-01 is cataloged in the U.S. Government catalog under NSN 5310-00-087-4908. 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.