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M12133/8-4 — 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: 0.148 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN, overall_height: 0.035 INCHES NOMINAL IN, outside_diameter: 0.260 INCHES MINIMUM AND 0.280 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 5310-01-330-2353, 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
M12133/8-4
NSN: 5310-01-330-2353
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_diameter0.148 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN
overall_height0.035 INCHES NOMINAL IN
outside_diameter0.260 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
style_designatorSPRING TENSION
surface_treatmentPASSIVATE OVERALL
material_thickness0.006 INCHES MINIMUM AND 0.008 INCHES MAXIMUM IN
material_document_and_classificationMIL-S-5059,1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-330-2353
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M12133/8-4 · 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
•
OUTSIDE DIAMETER: 0.260 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.148 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5059,1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: SPRING TENSION
•
MATERIAL: STEEL COMP 302 OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER0.260 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
HOLE DIAMETER0.148 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5059,1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORSPRING TENSION
OVERALL HEIGHT0.035 INCHES NOMINAL IN
MATERIALSTEEL COMP 302 OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
MATERIAL THICKNESS0.006 INCHES MINIMUM AND 0.008 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
MIL-W-12133/8InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M12133/8-6InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SU-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M12133/8-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M12133/8-8InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M12133/8-10InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M12133/8-4?
M12133/8-4 is a WASHER,SPRING TENSION.
What parts can replace M12133/8-4?
There are 9 known substitutes for M12133/8-4: MIL-W-12133/8, M12133/8-6, SU-1 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M12133/8-4?
M12133/8-4 is cataloged in the Federal Logistics Information System under NSN 5310-01-330-2353. This indicates validated use in U.S. government and defense supply chains.
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Last verified: October 2026