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2318-49-1 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2318-49-1: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 410 OR STEEL COMP 416 OVERALL, recess_depth: 0.044 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN, hole_diameter: 0.438 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN, heat_treatment: AS FABRICATED, overall_height: 0.169 INCHES MINIMUM AND 0.173 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES TOP. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-550-1383, 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
2318-49-1
NSN: 5310-00-550-1383
FSC: 5310 — Nuts and Washers
CAGE: 70255 — EMERSON ELECTRIC CO ALCO CONTROLS DIV (USA)
SPECIFICATIONS
materialSTEEL COMP 410 OR STEEL COMP 416 OVERALL
recess_depth0.044 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN
hole_diameter0.438 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN
heat_treatmentAS FABRICATED
overall_height0.169 INCHES MINIMUM AND 0.173 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES TOP
hardness_rating36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
outside_diameter0.807 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN
style_designatorRECESSED
surface_treatmentPASSIVATE OVERALL
material_thickness0.167 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN
material_document_and_classificationAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-550-1383
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2318-49-1 · 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: 63.0 MICROINCHES BOTTOM
•
HEAT TREATMENT: AS FABRICATED
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES BOTTOM
SURFACE FINISH63.0 MICROINCHES COUNTERBORE FACE
SURFACE FINISH63.0 MICROINCHES TOP
OVERALL HEIGHT0.169 INCHES MINIMUM AND 0.173 INCHES MAXIMUM IN
HEAT TREATMENTAS FABRICATED
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.807 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN
RECESS DEPTH0.044 INCHES MINIMUM AND 0.048 INCHES MAXIMUM 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 1
W20874Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2318-49-1?
2318-49-1 is a WASHER,RECESSED.
What parts can replace 2318-49-1?
There is 1 known substitute for 2318-49-1: W20874. Substitute compatibility should be verified for your specific system.
What is the NSN for 2318-49-1?
2318-49-1 is cataloged in the U.S. Government catalog under NSN 5310-00-550-1383. This indicates validated use in U.S. government and defense supply chains.
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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.