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175WK398 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

175WK398: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, hole_diameter: 0.404 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN, outside_diameter: 0.560 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: TIN OVERALL, material_thickness: 0.040 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-013-4423, 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
175WK398
NSN: 5310-01-013-4423
FSC: 5310 — Nuts and Washers
CAGE: 0KAA8 — PHT AEROSPACE LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
hole_diameter0.404 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN
outside_diameter0.560 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentTIN OVERALL
material_thickness0.040 INCHES NOMINAL IN
external_key_quantity11
internal_key_quantity1
external_straight_key_width0.080 INCHES NOMINAL IN
internal_straight_key_width0.088 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN
overall_distance_including_keys0.730 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN
material_document_and_classificationMIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-013-4423
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 175WK398 · 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
•
INTERNAL STRAIGHT KEY WIDTH: 0.088 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 0.167 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 0.730 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.560 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.040 INCHES NOMINAL IN
•
EXTERNAL STRAIGHT KEY WIDTH: 0.080 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
INTERNAL STRAIGHT KEY WIDTH0.088 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY0.167 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS0.730 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.560 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN
MATERIAL THICKNESS0.040 INCHES NOMINAL IN
EXTERNAL STRAIGHT KEY WIDTH0.080 INCHES NOMINAL IN
EXTERNAL KEY QUANTITY11
SURFACE TREATMENTTIN OVERALL
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
1590141-2Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 175WK398?
175WK398 is a WASHER,KEY.
What parts can replace 175WK398?
There is 1 known substitute for 175WK398: 1590141-2. Substitute compatibility should be verified for your specific system.
What is the NSN for 175WK398?
175WK398 is cataloged in the U.S. Government catalog under NSN 5310-01-013-4423. 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.