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F406A175 — NUT,PLAIN,EXTENDED WASHER,HEXAGO

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

F406A175: NUT,PLAIN,EXTENDED WASHER,HEXAGO.

NUT,PLAIN,EXTENDED WASHER,HEXAGO. Key specifications include material: COPPER OVERALL, nut_style: HEXAGON, thread_class: 2B, thread_series: UN, overall_height: 4.625 INCHES NOMINAL IN, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-449-9402, 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
F406A175
NSN: 5310-01-449-9402
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
materialCOPPER OVERALL
nut_styleHEXAGON
thread_class2B
thread_seriesUN
overall_height4.625 INCHES NOMINAL IN
thread_directionRIGHT-HAND
washer_thickness2.937 INCHES NOMINAL IN
width_across_flats1.667 INCHES MINIMUM AND 1.687 INCHES MAXIMUM IN
nominal_thread_size1.750 INCHES IN
counterbore_diameter0.500 INCHES NOMINAL NUT IN
washer_outside_diameter2.750 INCHES NOMINAL IN
thread_quantity_per_inch8
NSN5310-01-449-9402
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: F406A175 · 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
•
WASHER OUTSIDE DIAMETER: 2.750 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 1.667 INCHES MINIMUM AND 1.687 INCHES MAXIMUM IN
•
THREAD SERIES: UN
•
WASHER THICKNESS: 2.937 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.750 INCHES IN
•
COUNTERBORE DIAMETER: 0.500 INCHES NOMINAL NUT IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT4.625 INCHES NOMINAL IN
WASHER OUTSIDE DIAMETER2.750 INCHES NOMINAL IN
WIDTH ACROSS FLATS1.667 INCHES MINIMUM AND 1.687 INCHES MAXIMUM IN
THREAD SERIESUN
WASHER THICKNESS2.937 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.750 INCHES IN
COUNTERBORE DIAMETER0.500 INCHES NOMINAL NUT IN
NUT STYLEHEXAGON
THREAD CLASS2B
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
509E831CD PN 6Reference 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 F406A175?
F406A175 is a NUT,PLAIN,EXTENDED WASHER,HEXAGO.
What parts can replace F406A175?
There is 1 known substitute for F406A175: 509E831CD PN 6. Substitute compatibility should be verified for your specific system.
What is the NSN for F406A175?
F406A175 is cataloged in the U.S. Government catalog under NSN 5310-01-449-9402. 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.