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J1091 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,EYE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_width: 1.500 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND, surface_treatment: ZINC OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-903-6537, 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
J1091
NSN: 5310-00-903-6537
FSC: 5310
CAGE: 74999 — JOSLYN CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_width1.500 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
fabrication_methodFORGED
nominal_thread_size0.500 INCHES IN
thread_quantity_per_inch13
NSN5310-00-903-6537
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: J1091 · 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 CLASS: 2B
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
SURFACE TREATMENT: ZINC OVERALL
•
FABRICATION METHOD: FORGED
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL: STEEL OVERALL
•
HOLE WIDTH: 1.500 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 13
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
NOMINAL THREAD SIZE0.500 INCHES IN
SURFACE TREATMENTZINC OVERALL
FABRICATION METHODFORGED
THREAD DIRECTIONRIGHT-HAND
MATERIALSTEEL OVERALL
HOLE WIDTH1.500 INCHES NOMINAL IN
THREAD QUANTITY PER INCH13
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
RAL4Interchangeable
interchangeable cross-reference
interchangeable
RAL4-44X100Interchangeable
interchangeable cross-reference
interchangeable
PRECISION LINE LPF4Interchangeable
interchangeable cross-reference
interchangeable
197 4070Interchangeable
interchangeable cross-reference
interchangeable
GRA3Interchangeable
interchangeable cross-reference
interchangeable
EN-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is J1091?
J1091 is a NUT,EYE.
What parts can replace J1091?
There are 13 known substitutes for J1091: RAL4, RAL4-44X100, PRECISION LINE LPF4 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for J1091?
J1091 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-903-6537. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026