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1998518-1 — WASHER,SHOULDERED AND RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

1998518-1: WASHER,SHOULDERED AND RECESSED.

The WASHER,SHOULDERED AND RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OR STEEL COMP 303SE OVERALL, recess_depth: 0.046 INCHES NOMINAL IN, hole_diameter: 0.194 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN, recess_diameter: 0.406 INCHES NOMINAL IN, shoulder_height: 0.078 INCHES NOMINAL IN, outside_diameter: 0.875 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-237-9662, 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
1998518-1
NSN: 5310-00-237-9662
FSC: 5310 — Nuts and Washers
CAGE: 19315 — HONEYWELL INTL INC DEFENSE AVIONICS SYSTEMS FORMER BENDIX NAVIGATION AND CONTROL SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OR STEEL COMP 303SE OVERALL
recess_depth0.046 INCHES NOMINAL IN
hole_diameter0.194 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
recess_diameter0.406 INCHES NOMINAL IN
shoulder_height0.078 INCHES NOMINAL IN
outside_diameter0.875 INCHES NOMINAL IN
special_featuresCHAMFER SHOULDER 0.032 IN. BY 45 DEGREES IN
style_designatorSHOULDERED AND RECESSED
shoulder_diameter0.531 INCHES NOMINAL IN
material_thickness0.038 INCHES NOMINAL IN
material_document_and_classificationASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-237-9662
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1998518-1 · 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
•
SHOULDER HEIGHT: 0.078 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SHOULDERED AND RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.875 INCHES NOMINAL IN
•
RECESS DEPTH: 0.046 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.038 INCHES NOMINAL IN
•
SHOULDER DIAMETER: 0.531 INCHES NOMINAL IN
•
RECESS DIAMETER: 0.406 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SHOULDER HEIGHT0.078 INCHES NOMINAL IN
STYLE DESIGNATORSHOULDERED AND RECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.875 INCHES NOMINAL IN
RECESS DEPTH0.046 INCHES NOMINAL IN
MATERIAL THICKNESS0.038 INCHES NOMINAL IN
SHOULDER DIAMETER0.531 INCHES NOMINAL IN
RECESS DIAMETER0.406 INCHES NOMINAL IN
SPECIAL FEATURESCHAMFER SHOULDER 0.032 IN. BY 45 DEGREES IN
MATERIALSTEEL COMP 303 OR STEEL COMP 303SE 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

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 1998518-1?
1998518-1 is a WASHER,SHOULDERED AND RECESSED.
What is the NSN for 1998518-1?
1998518-1 is cataloged in the U.S. Government catalog under NSN 5310-00-237-9662. 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.