PartsTable
Technical Data Sheet
Download PDF

124-1678550 PC 18 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

124-1678550 PC 18: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, thickness: 0.188 INCHES NOMINAL IN, hole_diameter: 1.641 INCHES NOMINAL IN, surface_finish: 125.0 MICROINCHES BOTTOM, overall_diameter: 4.000 INCHES NOMINAL IN, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-480-9134, 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
124-1678550 PC 18
NSN: 5310-01-480-9134
FSC: 5310 — Nuts and Washers
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
thickness0.188 INCHES NOMINAL IN
hole_diameter1.641 INCHES NOMINAL IN
surface_finish125.0 MICROINCHES BOTTOM
overall_diameter4.000 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationHATCH:MARINE HARDWARE & HULL DOORS
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationMIL-B-994 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-480-9134
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 124-1678550 PC 18 · 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
•
SURFACE FINISH: 125.0 MICROINCHES BOTTOM
•
OVERALL DIAMETER: 4.000 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-994 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: COPPER ALLOY OVERALL
TECHNICAL CHARACTERISTICS
SURFACE FINISH125.0 MICROINCHES BOTTOM
SURFACE FINISH125.0 MICROINCHES TOP
OVERALL DIAMETER4.000 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-994 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
END ITEM IDENTIFICATIONHATCH:MARINE HARDWARE & HULL DOORS
MATERIALCOPPER ALLOY OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER1.641 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
1678550Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy 124-1678550 PC 18?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 124-1678550 PC 18?
124-1678550 PC 18 is a WASHER,FLAT.
What parts can replace 124-1678550 PC 18?
There is 1 known substitute for 124-1678550 PC 18: 1678550. Substitute compatibility should be verified for your specific system.
What is the NSN for 124-1678550 PC 18?
124-1678550 PC 18 is cataloged in the U.S. Government catalog under NSN 5310-01-480-9134. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 124-1678550 PC 18

✓ 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.