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539885 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

539885: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8740 OVERALL, hole_diameter: 0.314 INCHES MINIMUM AND 0.321 INCHES MAXIMUM IN, hardness_rating: 26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM, outside_diameter: 0.970 INCHES MINIMUM AND 0.990 INCHES MAXIMUM IN, special_features: 0.18 INCH RADIUS ON BOTH BEARING SURFACES IN, style_designator: RECESSED BOTH SIDES. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-799-9031, 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
539885
NSN: 5310-00-799-9031
FSC: 5310 — Nuts and Washers
CAGE: 73030 — HAMILTON SUNDSTRAND CORPORATION DBA COLLINS AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL COMP 8740 OVERALL
hole_diameter0.314 INCHES MINIMUM AND 0.321 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
outside_diameter0.970 INCHES MINIMUM AND 0.990 INCHES MAXIMUM IN
special_features0.18 INCH RADIUS ON BOTH BEARING SURFACES IN
style_designatorRECESSED BOTH SIDES
top_recess_angle89.5 DEGREES MINIMUM AND 90.5 DEGREES MAXIMUM
surface_treatmentCADMIUM OVERALL
material_thickness0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
bottom_recess_angle89.5 DEGREES MINIMUM AND 90.5 DEGREES MAXIMUM
top_recess_diameter0.388 INCHES NOMINAL IN
bottom_recess_diameter0.388 INCHES NOMINAL IN
NSN5310-00-799-9031
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 539885 · 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
•
TOP RECESS DIAMETER: 0.388 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
BOTTOM RECESS DIAMETER: 0.388 INCHES NOMINAL IN
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
•
TOP RECESS ANGLE: 89.5 DEGREES MINIMUM AND 90.5 DEGREES MAXIMUM
•
STYLE DESIGNATOR: RECESSED BOTH SIDES
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6049 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.970 INCHES MINIMUM AND 0.990 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
TOP RECESS DIAMETER0.388 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
BOTTOM RECESS DIAMETER0.388 INCHES NOMINAL IN
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
TOP RECESS ANGLE89.5 DEGREES MINIMUM AND 90.5 DEGREES MAXIMUM
STYLE DESIGNATORRECESSED BOTH SIDES
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6049 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.970 INCHES MINIMUM AND 0.990 INCHES MAXIMUM IN
MATERIAL THICKNESS0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
BOTTOM RECESS ANGLE89.5 DEGREES MINIMUM AND 90.5 DEGREES MAXIMUM
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
5310PL0933683Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 539885?
539885 is a WASHER,RECESSED.
What parts can replace 539885?
There is 1 known substitute for 539885: 5310PL0933683. Substitute compatibility should be verified for your specific system.
What is the NSN for 539885?
539885 is cataloged in the U.S. Government catalog under NSN 5310-00-799-9031. 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.