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674338 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

674338: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1009 OVERALL, hole_diameter: 0.373 INCHES NOMINAL IN, external_straight_key_width: 0.312 INCHES NOMINAL IN, external_straight_key_length: 0.437 INCHES NOMINAL IN, material_document_and_classification: QQ-S-698 FED SPEC ALL MATERIAL RESPONSES OR QQ-S-700 FED SPEC ALL MATERIAL RESPONSES OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-752-1786, 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
674338
NSN: 5310-00-752-1786
FSC: 5310 — Nuts and Washers
CAGE: 58275 — SASCO INC CANADIAN DIV
SPECIFICATIONS
materialSTEEL COMP 1009 OVERALL
hole_diameter0.373 INCHES NOMINAL IN
external_straight_key_width0.312 INCHES NOMINAL IN
external_straight_key_length0.437 INCHES NOMINAL IN
material_document_and_classificationQQ-S-698 FED SPEC ALL MATERIAL RESPONSES OR QQ-S-700 FED SPEC ALL MATERIAL RESPONSES OVERALL
NSN5310-00-752-1786
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 674338 · 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
•
EXTERNAL STRAIGHT KEY LENGTH: 0.437 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 FED SPEC ALL MATERIAL RESPONSES OR QQ-S-700 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
EXTERNAL STRAIGHT KEY WIDTH: 0.312 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 1009 OVERALL
•
HOLE DIAMETER: 0.373 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
EXTERNAL STRAIGHT KEY LENGTH0.437 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 FED SPEC ALL MATERIAL RESPONSES OR QQ-S-700 FED SPEC ALL MATERIAL RESPONSES OVERALL
EXTERNAL STRAIGHT KEY WIDTH0.312 INCHES NOMINAL IN
MATERIALSTEEL COMP 1009 OVERALL
HOLE DIAMETER0.373 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 4
1820R44Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
1412D5Reference document
Same NSN cross-reference
Reference document — Secondary reference
5310007521786Reference document
Same NSN cross-reference
Reference document — Secondary reference
324748Reference 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 674338?
674338 is a WASHER,KEY.
What parts can replace 674338?
There are 4 known substitutes for 674338: 1820R44, 1412D5, 5310007521786 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 674338?
674338 is cataloged in the U.S. Government catalog under NSN 5310-00-752-1786. 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.