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642-A174-3 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

642-A174-3: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1017 OVERALL, hole_diameter: 0.680 INCHES NOMINAL IN, special_features: DULL FINISH, material_thickness: 0.062 INCHES NOMINAL IN, length_across_flats: 2.500 INCHES NOMINAL IN, material_document_and_classification: QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-282-0845, 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
642-A174-3
NSN: 5310-01-282-0845
FSC: 5310 — Nuts and Washers
CAGE: 830Q4 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS-WRIGHT STEAM AND AIR SOLUTIONS DIV STEAM AND AIR SOLUTIONS (USA)
SPECIFICATIONS
materialSTEEL COMP 1017 OVERALL
hole_diameter0.680 INCHES NOMINAL IN
special_featuresDULL FINISH
material_thickness0.062 INCHES NOMINAL IN
length_across_flats2.500 INCHES NOMINAL IN
material_document_and_classificationQQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-282-0845
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 642-A174-3 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL THICKNESS: 0.062 INCHES NOMINAL IN
•
LENGTH ACROSS FLATS: 2.500 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 1017 OVERALL
•
HOLE DIAMETER: 0.680 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIAL THICKNESS0.062 INCHES NOMINAL IN
LENGTH ACROSS FLATS2.500 INCHES NOMINAL IN
SPECIAL FEATURESDULL FINISH
MATERIALSTEEL COMP 1017 OVERALL
HOLE DIAMETER0.680 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 2
PL-781E827 PIECE 70Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
642A174P3Reference 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 642-A174-3?
642-A174-3 is a WASHER,LOCK.
What parts can replace 642-A174-3?
There are 2 known substitutes for 642-A174-3: PL-781E827 PIECE 70, 642A174P3. Substitute compatibility should be verified for your specific system.
What is the NSN for 642-A174-3?
642-A174-3 is cataloged in the U.S. Government catalog under NSN 5310-01-282-0845. 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.