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PartsTable / COMPONENT / 993412
993412 ✓ 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,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1060 OR STEEL COMP 1064 OR STEEL COMP 1065 OVERALL, hole_diameter: 0.377 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, hardness_rating: 38.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM, outside_diameter: 0.680 INCHES MAXIMUM IN, special_features: SIZE: 3/8 (0.375 IN.) IN, style_designator: SPLIT HELICAL-RIGHT HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-637-9541, 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
993412
NSN: 5310-00-637-9541
FSC: 5310
CAGE: 89749 — CLARK MATERIAL HANDLING COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 1060 OR STEEL COMP 1064 OR STEEL COMP 1065 OVERALL
hole_diameter0.377 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
hardness_rating38.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM
outside_diameter0.680 INCHES MAXIMUM IN
special_featuresSIZE: 3/8 (0.375 IN.) IN
style_designatorSPLIT HELICAL-RIGHT HAND
surface_treatmentZINC OVERALL
material_thickness0.094 INCHES MINIMUM IN
end_item_identificationRG-33 MRAP VEHICLE; MRAP BUFFALO MK2A2; MRAP - COUGAR
surface_treatment_document_and_classificationASTM B633 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-637-9541
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 993412 · 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
•
HOLE DIAMETER: 0.377 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
•
HARDNESS RATING: 38.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL THICKNESS: 0.094 INCHES MINIMUM IN
•
SURFACE TREATMENT: ZINC OVERALL
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.377 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONRG-33 MRAP VEHICLE; MRAP BUFFALO MK2A2; MRAP - COUGAR
HARDNESS RATING38.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM
SPECIAL FEATURESSIZE: 3/8 (0.375 IN.) IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL THICKNESS0.094 INCHES MINIMUM IN
SURFACE TREATMENTZINC OVERALL
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
OUTSIDE DIAMETER0.680 INCHES MAXIMUM IN
MATERIALSTEEL COMP 1060 OR STEEL COMP 1064 OR STEEL COMP 1065 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
12Z22-53Interchangeable
interchangeable cross-reference
interchangeable
5310PL0691347Interchangeable
interchangeable cross-reference
interchangeable
MS35338-46Interchangeable
interchangeable cross-reference
interchangeable
H87-6Interchangeable
interchangeable cross-reference
interchangeable
7435-64HInterchangeable
interchangeable cross-reference
interchangeable
85392Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 993412?
993412 is a WASHER,LOCK.
What parts can replace 993412?
There are 28 known substitutes for 993412: 12Z22-53, 5310PL0691347, MS35338-46 and 25 more. Substitute compatibility should be verified for your specific system.
Is 993412 still available?
993412 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