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MIL-W-12133/8 — Technical Data Sheet

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— · 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: STEEL COMP 302 OVERALL, hole_diameter: 0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN, overall_height: 0.086 INCHES NOMINAL IN, outside_diameter: 0.725 INCHES MINIMUM AND 0.745 INCHES MAXIMUM IN, style_designator: SPRING TENSION, surface_treatment: PASSIVATE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5310-01-311-0005, 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
MIL-W-12133/8
NSN: 5310-01-311-0005
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 302 OVERALL
hole_diameter0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
overall_height0.086 INCHES NOMINAL IN
outside_diameter0.725 INCHES MINIMUM AND 0.745 INCHES MAXIMUM IN
style_designatorSPRING TENSION
surface_treatmentPASSIVATE OVERALL
material_thickness0.015 INCHES MINIMUM AND 0.017 INCHES MAXIMUM IN
specification/standard_data81349-MIL-W-12133/8 GOVERNMENT SPECIFICATION
material_document_and_classificationMIL-S-5059,T 1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-311-0005
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-W-12133/8 · 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
•
STYLE DESIGNATOR: SPRING TENSION
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5059,1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL THICKNESS: 0.011 INCHES MINIMUM AND 0.013 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.360 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL COMP 302 OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.039 INCHES NOMINAL IN
STYLE DESIGNATORSPRING TENSION
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5059,1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIAL THICKNESS0.011 INCHES MINIMUM AND 0.013 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.360 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 302 OVERALL
HOLE DIAMETER0.174 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
SU-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M12133/8-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M12133/8-4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M12133/8-8InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M12133/8-10InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M12133/8-13InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-W-12133/8?
MIL-W-12133/8 is a WASHER,SPRING TENSION.
What parts can replace MIL-W-12133/8?
There are 9 known substitutes for MIL-W-12133/8: SU-1, M12133/8-1, M12133/8-4 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-W-12133/8?
MIL-W-12133/8 is cataloged in the Federal Logistics Information System under NSN 5310-01-311-0005. This indicates validated use in U.S. government and defense supply chains.
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Last verified: October 2026