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PartsTable / COMPONENT / X81-1
X81-1 ✓ 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 PIN,SHOULDER,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN, shank_length: 1.812 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC). This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-357-2493, 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
X81-1
NSN: 5315-00-357-2493
FSC: 5315
CAGE: 00988 — SIOUX TOOLS INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN
shank_length1.812 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
overall_length3.250 INCHES NOMINAL IN
shank_diameter0.182 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN
first_end_styleSQUARE
style_designatorSHOULDER
thread_directionRIGHT-HAND
features_providedCASEHARDENED
NSN5315-00-357-2493
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: X81-1 · 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
•
FIRST END STYLE: SQUARE
•
STYLE DESIGNATOR: SHOULDER
•
MATERIAL: STEEL OVERALL
•
FEATURES PROVIDED: CASEHARDENED
•
SHOULDER DIAMETER: 0.250 INCHES NOMINAL IN
•
SHANK DIAMETER: 0.182 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN
•
SHANK LENGTH: 1.812 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END STYLESQUARE
STYLE DESIGNATORSHOULDER
MATERIALSTEEL OVERALL
FEATURES PROVIDEDCASEHARDENED
SHOULDER DIAMETER0.250 INCHES NOMINAL IN
SHANK DIAMETER0.182 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN
SHANK LENGTH1.812 INCHES NOMINAL IN
OVERALL LENGTH3.250 INCHES NOMINAL IN
FIRST END LOCATIONBOTH ENDS
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
5118-103-36Interchangeable
interchangeable cross-reference
interchangeable
832837Interchangeable
interchangeable cross-reference
interchangeable
120375Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is X81-1?
X81-1 is a PIN,SHOULDER,HEADLESS.
What parts can replace X81-1?
There are 3 known substitutes for X81-1: 5118-103-36, 832837, 120375. Substitute compatibility should be verified for your specific system.
What is the NSN for X81-1?
X81-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-357-2493. 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