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900178 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

900178: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 706 OR COPPER ALLOY 715 OVERALL, hole_diameter: 0.531 INCHES NOMINAL IN, outside_diameter: 0.938 INCHES NOMINAL IN, style_designator: KEY, material_thickness: 0.051 INCHES NOMINAL IN, external_prebent_key_width: 0.220 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-870-0373, 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
900178
NSN: 5310-00-870-0373
NIINs: 008700373, 010136871
FSC: 5310 — Nuts and Washers
CAGE: 53964 — KAYDON CUSTOM FILTRATION CORPORATION (USA)
SPECIFICATIONS
materialCOPPER ALLOY 706 OR COPPER ALLOY 715 OVERALL
hole_diameter0.531 INCHES NOMINAL IN
outside_diameter0.938 INCHES NOMINAL IN
style_designatorKEY
material_thickness0.051 INCHES NOMINAL IN
external_prebent_key_width0.220 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN
external_straight_key_width0.500 INCHES NOMINAL IN
overall_distance_including_keys1.582 INCHES NOMINAL IN
material_document_and_classificationMIL-C-15726 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyNAVY SPECIAL PROJECT
distance_from_centerline_to_inside_of_prebent_key0.531 INCHES NOMINAL IN
NSN5310-00-870-0373
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 900178 · 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
•
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY: 0.531 INCHES NOMINAL IN
•
OVERALL DISTANCE INCLUDING KEYS: 1.582 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-C-15726 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.938 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.051 INCHES NOMINAL IN
•
EXTERNAL STRAIGHT KEY WIDTH: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.531 INCHES NOMINAL IN
OVERALL DISTANCE INCLUDING KEYS1.582 INCHES NOMINAL IN
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-C-15726 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.938 INCHES NOMINAL IN
MATERIAL THICKNESS0.051 INCHES NOMINAL IN
EXTERNAL STRAIGHT KEY WIDTH0.500 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
EXTERNAL PREBENT KEY WIDTH0.220 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY 706 OR COPPER ALLOY 715 OVERALL
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 900178?
900178 is a WASHER,KEY.
What is the NSN for 900178?
900178 is cataloged in the U.S. Government catalog under NSN 5310-00-870-0373. 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.