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Technical Data Sheet
PartsTable / COMPONENT / 12759-01320
12759-01320 ✓ 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 OVERALL, hole_diameter: 5.1 MILLIMETERS MINIMUM AND 5.4 MILLIMETERS MAXIMUM MM, hardness_rating: 44.0 ROCKWELL C MINIMUM AND 51.0 ROCKWELL C MAXIMUM, outside_diameter: 9.2 MILLIMETERS MAXIMUM MM, style_designator: SPLIT HELICAL-RIGHT HAND, surface_treatment: ZINC OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-591-4823, 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
12759-01320
NSN: 5310-01-591-4823
FSC: 5310
CAGE: 0Y3H3 — FASTENAL COMPANY DBA FASTENAL CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter5.1 MILLIMETERS MINIMUM AND 5.4 MILLIMETERS MAXIMUM MM
hardness_rating44.0 ROCKWELL C MINIMUM AND 51.0 ROCKWELL C MAXIMUM
outside_diameter9.2 MILLIMETERS MAXIMUM MM
style_designatorSPLIT HELICAL-RIGHT HAND
surface_treatmentZINC OVERALL
material_thickness1.1 MILLIMETERS MINIMUM AND 1.3 MILLIMETERS MAXIMUM MM
end_item_identificationSTRYKER
part_name_assigned_by_controlling_agencySPLIT LOCK WASHER
surface_treatment_document_and_classificationASTM B695, TYPE I, CLASS 50 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-591-4823
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12759-01320 · 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
•
HARDNESS RATING: 44.0 ROCKWELL C MINIMUM AND 51.0 ROCKWELL C MAXIMUM
•
MATERIAL THICKNESS: 1.1 MILLIMETERS MINIMUM AND 1.3 MILLIMETERS MAXIMUM MM
•
OUTSIDE DIAMETER: 9.2 MILLIMETERS MAXIMUM MM
•
HOLE DIAMETER: 5.1 MILLIMETERS MINIMUM AND 5.4 MILLIMETERS MAXIMUM MM
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B695, TYPE I, CLASS 50 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING44.0 ROCKWELL C MINIMUM AND 51.0 ROCKWELL C MAXIMUM
MATERIAL THICKNESS1.1 MILLIMETERS MINIMUM AND 1.3 MILLIMETERS MAXIMUM MM
PART NAME ASSIGNED BY CONTROLLING AGENCYSPLIT LOCK WASHER
OUTSIDE DIAMETER9.2 MILLIMETERS MAXIMUM MM
END ITEM IDENTIFICATIONSTRYKER
HOLE DIAMETER5.1 MILLIMETERS MINIMUM AND 5.4 MILLIMETERS MAXIMUM MM
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B695, TYPE I, CLASS 50 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
MATERIALSTEEL OVERALL
SURFACE TREATMENTZINC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
1403-50Interchangeable
interchangeable cross-reference
interchangeable
403-80Interchangeable
interchangeable cross-reference
interchangeable
1403-80Interchangeable
interchangeable cross-reference
interchangeable
51222Interchangeable
interchangeable cross-reference
interchangeable
SE-011-PInterchangeable
interchangeable cross-reference
interchangeable
46333-009-00Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 12759-01320?
12759-01320 is a WASHER,LOCK.
What parts can replace 12759-01320?
There are 9 known substitutes for 12759-01320: 1403-50, 403-80, 1403-80 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12759-01320?
12759-01320 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-591-4823. 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