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ST2183-11 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ST2183-11: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: DOUBLE HEXAGON, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.458 INCHES MINIMUM AND 0.473 INCHES MAXIMUM IN, hardness_rating: 48.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-131-0748, 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
ST2183-11
NSN: 5310-01-131-0748
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleDOUBLE HEXAGON
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.458 INCHES MINIMUM AND 0.473 INCHES MAXIMUM IN
hardness_rating48.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.060 INCHES MINIMUM IN
width_across_flats0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
nominal_thread_size0.3125 INCHES IN
washer_outside_diameter0.498 INCHES MINIMUM IN
NSN5310-01-131-0748
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST2183-11 · 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: 0.498 INCHES MINIMUM IN
•
WIDTH ACROSS FLATS: 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
HARDNESS RATING: 48.0 ROCKWELL C MAXIMUM
•
WASHER THICKNESS: 0.060 INCHES MINIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.458 INCHES MINIMUM AND 0.473 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.498 INCHES MINIMUM IN
WIDTH ACROSS FLATS0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
HARDNESS RATING48.0 ROCKWELL C MAXIMUM
WASHER THICKNESS0.060 INCHES MINIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.3125 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
SUBSTITUTES & CROSS-REFERENCES 1
LH11588-5Reference 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 ST2183-11?
ST2183-11 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace ST2183-11?
There is 1 known substitute for ST2183-11: LH11588-5. Substitute compatibility should be verified for your specific system.
What is the NSN for ST2183-11?
ST2183-11 is cataloged in the U.S. Government catalog under NSN 5310-01-131-0748. This indicates validated use in U.S. government and defense supply chains.
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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.