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PartsTable / COMPONENT / 1021-525
1021-525 ✓ 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,SPRING is a the manufacturer industrial component. Key specifications include diameter: 0.188 INCHES NOMINAL IN, material: STEEL OVERALL, overall_length: 1.125 INCHES NOMINAL IN, style_designator: SLOTTED, material_thickness: 0.040 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-141-1651, 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
1021-525
NSN: 5315-00-141-1651
FSC: 5315
CAGE: 10137 — SZEMCO INC (USA)
SPECIFICATIONS
diameter0.188 INCHES NOMINAL IN
materialSTEEL OVERALL
overall_length1.125 INCHES NOMINAL IN
style_designatorSLOTTED
material_thickness0.040 INCHES NOMINAL IN
NSN5315-00-141-1651
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1021-525 · 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
•
DIAMETER: 0.188 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SLOTTED
•
MATERIAL: STEEL OVERALL
•
MATERIAL THICKNESS: 0.040 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
DIAMETER0.188 INCHES NOMINAL IN
OVERALL LENGTH1.125 INCHES NOMINAL IN
STYLE DESIGNATORSLOTTED
MATERIALSTEEL OVERALL
MATERIAL THICKNESS0.040 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
18588Interchangeable
interchangeable cross-reference
interchangeable
18588-0-35MFDInterchangeable
interchangeable cross-reference
interchangeable
18588-0-35MFD-K38612Interchangeable
interchangeable cross-reference
interchangeable
M19-20873 PC NO 156Interchangeable
interchangeable cross-reference
interchangeable
5305PL0810133Interchangeable
interchangeable cross-reference
interchangeable
3741868Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1021-525?
1021-525 is a PIN,SPRING.
What parts can replace 1021-525?
There are 8 known substitutes for 1021-525: 18588, 18588-0-35MFD, 18588-0-35MFD-K38612 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1021-525?
1021-525 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-141-1651. 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