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Technical Data Sheet
PartsTable / COMPONENT / JLS-A1-21
JLS-A1-21 ✓ 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,PLAIN,KNURLED is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: KNURLED, knurl_width: 0.250 INCHES NOMINAL IN, nut_diameter: 0.750 INCHES NOMINAL IN, thread_class: 2B, nut_thickness: 0.500 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-818-4091, 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
JLS-A1-21
NSN: 5310-00-818-4091
FSC: 5310
CAGE: 56262 — NORDEX INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleKNURLED
knurl_width0.250 INCHES NOMINAL IN
nut_diameter0.750 INCHES NOMINAL IN
thread_class2B
nut_thickness0.500 INCHES NOMINAL IN
thread_seriesUNIFIED NATIONAL COARSE (UNC)
small_end_length0.250 INCHES NOMINAL IN
thread_directionRIGHT-HAND
small_end_diameter0.500 INCHES NOMINAL IN
nominal_thread_size0.250 INCHES IN
thread_quantity_per_inch20
NSN5310-00-818-4091
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: JLS-A1-21 · 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
•
SMALL END DIAMETER: 0.500 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 20
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
NUT STYLE: KNURLED
•
SMALL END LENGTH: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
SMALL END DIAMETER0.500 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH20
NOMINAL THREAD SIZE0.250 INCHES IN
MATERIALSTEEL CORROSION RESISTING OVERALL
NUT STYLEKNURLED
SMALL END LENGTH0.250 INCHES NOMINAL IN
KNURL WIDTH0.250 INCHES NOMINAL IN
NUT DIAMETER0.750 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
4090Interchangeable
interchangeable cross-reference
interchangeable
72-700476-7Interchangeable
interchangeable cross-reference
interchangeable
3LT409037COHInterchangeable
interchangeable cross-reference
interchangeable
710048Interchangeable
interchangeable cross-reference
interchangeable
A1837-3Interchangeable
interchangeable cross-reference
interchangeable
N1511Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is JLS-A1-21?
JLS-A1-21 is a NUT,PLAIN,KNURLED.
What parts can replace JLS-A1-21?
There are 18 known substitutes for JLS-A1-21: 4090, 72-700476-7, 3LT409037COH and 15 more. Substitute compatibility should be verified for your specific system.
Is JLS-A1-21 still available?
JLS-A1-21 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026