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Technical Data Sheet
PartsTable / COMPONENT / 537B21-41
537B21-41 ✓ 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 WASHER,SPRING TENSION is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, hole_diameter: 0.197 INCHES MINIMUM AND 0.201 INCHES MAXIMUM IN, outside_diameter: 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN, surface_treatment: NICKEL OVERALL, material_thickness: 0.008 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN, surface_treatment_document_and_classification: QQ-N-290,CL 1,TY 5 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-052-0326, 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
537B21-41
NSN: 5310-00-052-0326
FSC: 5310
CAGE: 94033 — CARDWELL CONDENSER CORP LAPOINTE-ADMIRAL DIV (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
hole_diameter0.197 INCHES MINIMUM AND 0.201 INCHES MAXIMUM IN
outside_diameter0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
surface_treatmentNICKEL OVERALL
material_thickness0.008 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN
surface_treatment_document_and_classificationQQ-N-290,CL 1,TY 5 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-052-0326
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 537B21-41 · 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
•
MATERIAL: COPPER ALLOY OVERALL
•
OUTSIDE DIAMETER: 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.008 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.197 INCHES MINIMUM AND 0.201 INCHES MAXIMUM IN
•
SURFACE TREATMENT: NICKEL OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-N-290,CL 1,TY 5 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY OVERALL
OUTSIDE DIAMETER0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
MATERIAL THICKNESS0.008 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN
HOLE DIAMETER0.197 INCHES MINIMUM AND 0.201 INCHES MAXIMUM IN
SURFACE TREATMENTNICKEL OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-N-290,CL 1,TY 5 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
4E07Interchangeable
interchangeable cross-reference
interchangeable
DX256Interchangeable
interchangeable cross-reference
interchangeable
110405Interchangeable
interchangeable cross-reference
interchangeable
2W50Interchangeable
interchangeable cross-reference
interchangeable
2WInterchangeable
interchangeable cross-reference
interchangeable
EHH9160Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 537B21-41?
537B21-41 is a WASHER,SPRING TENSION.
What parts can replace 537B21-41?
There are 27 known substitutes for 537B21-41: 4E07, DX256, 110405 and 24 more. Substitute compatibility should be verified for your specific system.
Is 537B21-41 still available?
537B21-41 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