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F401A125 — F401A125

✓ Government record, cited
CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS-WRIGHT STEAM AND AIR SOLUTIONS DIV STEAM AND AIR SOLUTIONS · NUT WASHER
PRODUCT OVERVIEW

F401A125: F401A125.

The F401A125 is a CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS-WRIGHT STEAM AND AIR SOLUTIONS DIV STEAM AND AIR SOLUTIONS industrial component. This part is cataloged in the U.S. Government catalog under NSN 5310-01-455-2073, 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
F401A125
NSN: 5310-01-455-2073
FSC: 5310 — Nuts and Washers
CAGE: 830Q4 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS-WRIGHT STEAM AND AIR SOLUTIONS DIV STEAM AND AIR SOLUTIONS (USA)
SPECIFICATIONS
Part NumberF401A125
ManufacturerCURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS-WRIGHT STEAM AND AIR SOLUTIONS DIV STEAM AND AIR SOLUTIONS
NSN5310-01-455-2073
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: F401A125 · CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS-WRIGHT STEAM AND AIR SOLUTIONS DIV STEAM AND AIR SOLUTIONS ⚠ 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: 1.938 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
•
THREAD SERIES: UN
•
TEMP RATING: 751.0 FAHRENHEIT MINIMUM AND 950.0 FAHRENHEIT MAXIMUM DEGF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.250 INCHES IN
•
NUT HEIGHT: 1.187 INCHES MINIMUM AND 1.251 INCHES MAXIMUM IN
•
SURFACE TREATMENT: COPPER OVERALL
•
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS1.938 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
THREAD SERIESUN
TEMP RATING751.0 FAHRENHEIT MINIMUM AND 950.0 FAHRENHEIT MAXIMUM DEGF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.250 INCHES IN
NUT HEIGHT1.187 INCHES MINIMUM AND 1.251 INCHES MAXIMUM IN
SURFACE TREATMENTCOPPER OVERALL
NUT STYLEHEXAGON
THREAD CLASS2B
THREAD QUANTITY PER INCH8
SUBSTITUTES & CROSS-REFERENCES 1
509E831CR PN6Reference document
Same NSN cross-reference
Reference document — Secondary 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 F401A125?
F401A125 is a F401A125 manufactured by CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS-WRIGHT STEAM AND AIR SOLUTIONS DIV STEAM AND AIR SOLUTIONS.
What parts can replace F401A125?
There is 1 known substitute for F401A125: 509E831CR PN6. Substitute compatibility should be verified for your specific system.
What is the NSN for F401A125?
F401A125 is cataloged in the U.S. Government catalog under NSN 5310-01-455-2073. 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.