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143738 — SEAL,PLAIN

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

143738: SEAL,PLAIN.

The SEAL,PLAIN is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 3.047 INCHES NOMINAL IN, overall_height: 0.258 INCHES NOMINAL IN, outside_diameter: 3.916 INCHES NOMINAL IN, surface_treatment: CADMIUM OVERALL, material_thickness: 0.042 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-138-8502, 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
143738
NSN: 5310-01-138-8502
NIINs: 011388502, 012026714
FSC: 5310 — Nuts and Washers
CAGE: 21877 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter3.047 INCHES NOMINAL IN
overall_height0.258 INCHES NOMINAL IN
outside_diameter3.916 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL
material_thickness0.042 INCHES NOMINAL IN
material_document_and_classificationQQ-S-777 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-138-8502
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 143738 · 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 TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-777 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 3.916 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.042 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 3.047 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.258 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-777 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER3.916 INCHES NOMINAL IN
MATERIAL THICKNESS0.042 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL OVERALL
HOLE DIAMETER3.047 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
2885178-1Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
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 143738?
143738 is a SEAL,PLAIN.
What parts can replace 143738?
There is 1 known substitute for 143738: 2885178-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 143738?
143738 is cataloged in the U.S. Government catalog under NSN 5310-01-138-8502. 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.