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B-781 — B-781

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

B-781: B-781.

The B-781 is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, thickness: 0.031 INCHES NOMINAL IN, hole_diameter: 0.265 INCHES NOMINAL IN, overall_diameter: 0.620 INCHES NOMINAL IN, end_item_identification: KC-135 STRATOLIFTER AIRCRAFT, criticality_code_justification: FEAT. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-009-5620, 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
MRO→ MRO_GENERAL→ B-781
NSN: 5310-01-009-5620
NIINs: 010095620, 015055346
FSC: 5310 — Nuts and Washers
CAGE: 78062 — SARGENT AEROSPACE & DEFENSE, LLC DBA SARGENT CONTROLS & AEROSPACE DIV SARGENT CONTROLS & AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
thickness0.031 INCHES NOMINAL IN
hole_diameter0.265 INCHES NOMINAL IN
overall_diameter0.620 INCHES NOMINAL IN
end_item_identificationKC-135 STRATOLIFTER AIRCRAFT
criticality_code_justificationFEAT
material_document_and_classificationQQ-S-685 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyINAVY HP J5600 WORKSTATION
NSN5310-01-009-5620
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B-781 · 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
•
OVERALL DIAMETER: 0.620 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-685 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL COMP 4130 OVERALL
•
HOLE DIAMETER: 0.265 INCHES NOMINAL IN
•
THICKNESS: 0.031 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.620 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-685 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
END ITEM IDENTIFICATIONKC-135 STRATOLIFTER AIRCRAFT
MATERIALSTEEL COMP 4130 OVERALL
HOLE DIAMETER0.265 INCHES NOMINAL IN
THICKNESS0.031 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B-781?
B-781 is a B-781. It is classified as a MRO (MRO_GENERAL).
What is the NSN for B-781?
B-781 is cataloged in the U.S. Government catalog under NSN 5310-01-009-5620. 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.