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4085-21 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4085-21: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.175 INCHES NOMINAL IN, outside_diameter: 0.375 INCHES NOMINAL IN, style_designator: FLAT EXTERNAL TEETH, material_thickness: 0.020 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-374-5428, 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
4085-21
NSN: 5310-01-374-5428
FSC: 5310 — Nuts and Washers
CAGE: 17479 — HONEYWELL INC COMMERCIAL DIV (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.175 INCHES NOMINAL IN
outside_diameter0.375 INCHES NOMINAL IN
style_designatorFLAT EXTERNAL TEETH
material_thickness0.020 INCHES NOMINAL IN
NSN5310-01-374-5428
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4085-21 · 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
•
STYLE DESIGNATOR: FLAT EXTERNAL TEETH
•
OUTSIDE DIAMETER: 0.375 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.020 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.175 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORFLAT EXTERNAL TEETH
OUTSIDE DIAMETER0.375 INCHES NOMINAL IN
MATERIAL THICKNESS0.020 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.175 INCHES NOMINAL 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
4085Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 4085-21?
4085-21 is a WASHER,LOCK.
What parts can replace 4085-21?
There is 1 known substitute for 4085-21: 4085. Substitute compatibility should be verified for your specific system.
What is the NSN for 4085-21?
4085-21 is cataloged in the U.S. Government catalog under NSN 5310-01-374-5428. 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.