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1B5511 — NUT,CLIP-ON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

1B5511: NUT,CLIP-ON.

The NUT,CLIP-ON is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: FLOATINGFLOATING, thread_class: 3B3B, overall_width: 0.437 INCHES NOMINAL0.437 INCHES NOMINAL IN, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF), hardness_rating: 32.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM38.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-388-6218, 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
1B5511
NSN: 5310-01-388-6218
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_styleFLOATINGFLOATING
thread_class3B3B
overall_width0.437 INCHES NOMINAL0.437 INCHES NOMINAL IN
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
hardness_rating32.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM38.0 ROCKWELL C MAXIMUM
panel_thickness0.160 INCHES NOMINAL0.160 INCHES NOMINAL IN
thread_directionRIGHT-HANDRIGHT-HAND
precious_materialSILVER
surface_treatmentSILVER OVERALL
nominal_thread_size0.190 INCHES0.190 INCHES IN
thread_quantity_per_inch3232
NSN5310-01-388-6218
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1B5511 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
•
PRECIOUS MATERIAL: SILVER
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM38.0 ROCKWELL C MAXIMUM
•
DISTANCE FROM BASE TO CENTER OF APERTURE: 0.400 INCHES NOMINAL0.400 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)UNIFIED NATIONAL JOINT FINE (UNJF)
PRECIOUS MATERIALSILVER
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM38.0 ROCKWELL C MAXIMUM
DISTANCE FROM BASE TO CENTER OF APERTURE0.400 INCHES NOMINAL0.400 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OVERALL WIDTH0.437 INCHES NOMINAL0.437 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
PANEL THICKNESS0.160 INCHES NOMINAL0.160 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.190 INCHES0.190 INCHES IN
SUBSTITUTES & CROSS-REFERENCES 3
185511Reference document
Same NSN cross-reference
Reference document — Secondary reference
751961Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
F39304-3-2Reference 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 1B5511?
1B5511 is a NUT,CLIP-ON.
What parts can replace 1B5511?
There are 3 known substitutes for 1B5511: 185511, 751961, F39304-3-2. Substitute compatibility should be verified for your specific system.
What is the NSN for 1B5511?
1B5511 is cataloged in the U.S. Government catalog under NSN 5310-01-388-6218. This indicates validated use in U.S. government and defense supply chains.
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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.