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9012881-4 — NUT,SLEEVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

9012881-4: NUT,SLEEVE.

The NUT,SLEEVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: SLEEVE, thread_class: 3B, thread_series: UN, hardness_rating: 25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-177-2435, 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
9012881-4
NSN: 5310-00-177-2435
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
materialSTEEL OVERALL
nut_styleSLEEVE
thread_class3B
thread_seriesUN
hardness_rating25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
nominal_thread_size1.750 INCHES IN
counterbore_diameter1.859 INCHES MINIMUM AND 1.891 INCHES MAXIMUM NUT IN
cross-sectional_shapeROUND NUT
nut_counterbore_depth0.359 INCHES MINIMUM AND 0.391 INCHES MAXIMUM NUT IN
nut_width_across_flats2.734 INCHES MINIMUM AND 2.766 INCHES MAXIMUM IN
boss_width_across_flats1.631 INCHES MINIMUM AND 1.688 INCHES MAXIMUM IN
NSN5310-00-177-2435
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 9012881-4 · 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
•
THREAD SERIES: UN
•
NUT WIDTH ACROSS FLATS: 2.734 INCHES MINIMUM AND 2.766 INCHES MAXIMUM IN
•
HARDNESS RATING: 25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
•
NUT COUNTERBORE DEPTH: 0.359 INCHES MINIMUM AND 0.391 INCHES MAXIMUM NUT IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.750 INCHES IN
•
COUNTERBORE DIAMETER: 1.859 INCHES MINIMUM AND 1.891 INCHES MAXIMUM NUT IN
•
BOSS WIDTH ACROSS FLATS: 1.631 INCHES MINIMUM AND 1.688 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
THREAD SERIESUN
NUT WIDTH ACROSS FLATS2.734 INCHES MINIMUM AND 2.766 INCHES MAXIMUM IN
HARDNESS RATING25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
NUT COUNTERBORE DEPTH0.359 INCHES MINIMUM AND 0.391 INCHES MAXIMUM NUT IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.750 INCHES IN
COUNTERBORE DIAMETER1.859 INCHES MINIMUM AND 1.891 INCHES MAXIMUM NUT IN
BOSS WIDTH ACROSS FLATS1.631 INCHES MINIMUM AND 1.688 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPEHEXAGONAL BOSS
CROSS-SECTIONAL SHAPEROUND NUT
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 9
WW8676505PC25Reference document
Same NSN cross-reference
Reference document — Secondary reference
WW8608975PC19Reference document
Same NSN cross-reference
Reference document — Secondary reference
5939303-20Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
8608975P19Reference document
Same NSN cross-reference
Reference document — Secondary reference
WW8008625PC20Reference document
Same NSN cross-reference
Reference document — Secondary reference
WW8679653PC20Reference 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 9012881-4?
9012881-4 is a NUT,SLEEVE.
What parts can replace 9012881-4?
There are 9 known substitutes for 9012881-4: WW8676505PC25, WW8608975PC19, 5939303-20 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 9012881-4?
9012881-4 is cataloged in the U.S. Government catalog under NSN 5310-00-177-2435. 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.