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277712 — RIB,STIFFENER,AIRCRAFT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

277712: RIB,STIFFENER,AIRCRAFT.

The RIB,STIFFENER,AIRCRAFT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024, aircraft_location: FLAP-CARRIAGE ATTACH, aircraft_station_number: 489.42 AND 492.70, end_item_identification: B-52 AIRCRAFT, aircraft_mission_design_series: B-52, part_name_assigned_by_controlling_agency: RIB INSTALLATION. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-596-8262, 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
277712
NSN: 5310-00-596-8262
NIINs: 005968262, 013430895, 016482259
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024
aircraft_locationFLAP-CARRIAGE ATTACH
aircraft_station_number489.42 AND 492.70
end_item_identificationB-52 AIRCRAFT
aircraft_mission_design_seriesB-52
part_name_assigned_by_controlling_agencyRIB INSTALLATION
NSN5310-00-596-8262
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 277712 · 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
•
WIDTH ACROSS FLATS: 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
HOLE CONFIGURATION STYLE: CONFIGURATION B
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MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5645 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: LEFT-HAND
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NOMINAL THREAD SIZE: 0.375 INCHES IN
•
NUT HEIGHT: 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
•
DRILLED HOLE DIAMETER: 0.057 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN
THREAD SERIESUNF
HOLE CONFIGURATION STYLECONFIGURATION B
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5645 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONLEFT-HAND
NOMINAL THREAD SIZE0.375 INCHES IN
NUT HEIGHT0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
DRILLED HOLE DIAMETER0.057 INCHES NOMINAL IN
COUNTERSINK ANGLE85.0 DEGREES MINIMUM AND 95.0 DEGREES MAXIMUM NUT
NUT STYLEHEXAGON
SUBSTITUTES & CROSS-REFERENCES 1
27712Reference 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 277712?
277712 is a RIB,STIFFENER,AIRCRAFT.
What parts can replace 277712?
There is 1 known substitute for 277712: 27712. Substitute compatibility should be verified for your specific system.
What is the NSN for 277712?
277712 is cataloged in the U.S. Government catalog under NSN 5310-00-596-8262. 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.