PartsTable
Technical Data Sheet
Download PDF

135B5661 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

135B5661: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, recess_angle: 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM, hole_diameter: 0.196 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN, heat_treatment: NORMALIZED, hardness_rating: 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM, recess_diameter: 0.392 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-978-0883, 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
135B5661
NSN: 5310-00-978-0883
FSC: 5310 — Nuts and Washers
CAGE: 05606 — GENERAL DYNAMICS-OTS, INC. DIV ORDNANCE AND TACTICAL SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
recess_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
hole_diameter0.196 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
heat_treatmentNORMALIZED
hardness_rating30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM
recess_diameter0.392 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN
outside_diameter0.960 INCHES MINIMUM AND 1.020 INCHES MAXIMUM IN
style_designatorRECESSED
surface_treatmentPHOSPHATE OVERALL
material_thickness0.090 INCHES NOMINAL IN
NSN5310-00-978-0883
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 135B5661 · 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: NORMALIZED
•
HARDNESS RATING: 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: RECESSED
•
OUTSIDE DIAMETER: 0.960 INCHES MINIMUM AND 1.020 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.090 INCHES NOMINAL IN
•
RECESS DIAMETER: 0.392 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PHOSPHATE OVERALL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
HEAT TREATMENTNORMALIZED
HARDNESS RATING30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORRECESSED
OUTSIDE DIAMETER0.960 INCHES MINIMUM AND 1.020 INCHES MAXIMUM IN
MATERIAL THICKNESS0.090 INCHES NOMINAL IN
RECESS DIAMETER0.392 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN
SURFACE TREATMENTPHOSPHATE OVERALL
MATERIALSTEEL OVERALL
HOLE DIAMETER0.196 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
RECESS ANGLE99.0 DEGREES MINIMUM AND 101.0 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 2
5310PL0738250Reference document
Same NSN cross-reference
Reference document — Informative reference only
135B661Reference 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
Ready to buy 135B5661?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 135B5661?
135B5661 is a WASHER,RECESSED.
What parts can replace 135B5661?
There are 2 known substitutes for 135B5661: 5310PL0738250, 135B661. Substitute compatibility should be verified for your specific system.
What is the NSN for 135B5661?
135B5661 is cataloged in the U.S. Government catalog under NSN 5310-00-978-0883. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 135B5661

✓ 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.