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3131-028 — SUPPORT,STRUCTURAL COMPONENT,AIR

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

3131-028: SUPPORT,STRUCTURAL COMPONENT,AIR.

SUPPORT,STRUCTURAL COMPONENT,AIR. Key specifications include material: STEEL, aircraft_location: COCKPIT, material_document_and_classification: MIL-S-6736 MIL SPEC SINGLE MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-115-3256, 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
3131-028
NSN: 5315-00-115-3256
NIINs: 001153256, 009607957
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 66503 — WOODWARD, INC. DIV FUEL SYSTEMS AND CONTROLS (USA)
SPECIFICATIONS
materialSTEEL
aircraft_locationCOCKPIT
material_document_and_classificationMIL-S-6736 MIL SPEC SINGLE MATERIAL RESPONSE
NSN5315-00-115-3256
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3131-028 · 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
•
FIRST END TAPER LENGTH: 0.020 INCHES NOMINAL IN
•
FIRST END STYLE: CHAMFERED
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI 410 ASSN STD 1ST MATERIAL RESPONSE AND AMS 5610 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
FIRST END TAPER ANGLE: 30.0 DEGREES NOMINAL
•
PIN OVERALL DIAMETER: 0.1580 INCHES MINIMUM AND 0.1583 INCHES MAXIMUM IN
•
PIN OVERALL LENGTH: 0.500 INCHES NOMINAL IN
•
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
TECHNICAL CHARACTERISTICS
FIRST END TAPER LENGTH0.020 INCHES NOMINAL IN
FIRST END STYLECHAMFERED
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAISI 410 ASSN STD 1ST MATERIAL RESPONSE AND AMS 5610 ASSN STD 2ND MATERIAL RESPONSE OVERALL
FIRST END TAPER ANGLE30.0 DEGREES NOMINAL
PIN OVERALL DIAMETER0.1580 INCHES MINIMUM AND 0.1583 INCHES MAXIMUM IN
PIN OVERALL LENGTH0.500 INCHES NOMINAL IN
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
MATERIALSTEEL COMP 410 OR STEEL COMP 416F 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 3131-028?
3131-028 is a SUPPORT,STRUCTURAL COMPONENT,AIR.
What is the NSN for 3131-028?
3131-028 is cataloged in the U.S. Government catalog under NSN 5315-00-115-3256. 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.