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Technical Data Sheet
PartsTable / COMPONENT / 12768-4
12768-4 ✓ 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 hole_diameter: 0.801 INCHES MINIMUM AND 0.816 INCHES MAXIMUM IN, hardness_rating: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM, outside_diameter: 1.110 INCHES MINIMUM AND 1.140 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: CADMIUM OR ZINC OVERALL, material_thickness: 0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-209-1882, 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
12768-4
NSN: 5310-00-209-1882
FSC: 5310
CAGE: 10412 — WHITTAKER CORP WHITTAKER ELECTRONIC SYSTEMS DIV (USA)
SPECIFICATIONS
hole_diameter0.801 INCHES MINIMUM AND 0.816 INCHES MAXIMUM IN
hardness_rating50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
outside_diameter1.110 INCHES MINIMUM AND 1.140 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentCADMIUM OR ZINC OVERALL
material_thickness0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
external_key_quantity11
external_prebent_key_width0.146 INCHES MINIMUM AND 0.166 INCHES MAXIMUM IN
internal_prebent_key_width0.156 INCHES MINIMUM AND 0.176 INCHES MAXIMUM IN
internal_prebent_key_length0.062 INCHES MINIMUM AND 0.093 INCHES MAXIMUM IN
overall_distance_including_keys1.531 INCHES MAXIMUM IN
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-209-1882
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12768-4 · 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
•
HOLE DIAMETER: 0.115 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN
•
SURFACE TREATMENT: SILVER OVERALL
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
MATERIAL THICKNESS: 0.025 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY OVERALL
•
OUTSIDE DIAMETER: 0.212 INCHES NOMINAL IN
•
HARDNESS RATING: 90.0 ROCKWELL B MINIMUM
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.115 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN
SURFACE TREATMENTSILVER OVERALL
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
MATERIAL THICKNESS0.025 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
OUTSIDE DIAMETER0.212 INCHES NOMINAL IN
HARDNESS RATING90.0 ROCKWELL B MINIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
13AD6D1084CPC29Interchangeable
interchangeable cross-reference
interchangeable
D8904PC36Interchangeable
interchangeable cross-reference
interchangeable
3F1905PC48Interchangeable
interchangeable cross-reference
interchangeable
127684Interchangeable
interchangeable cross-reference
interchangeable
846172492Interchangeable
interchangeable cross-reference
interchangeable
34983-1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 12768-4?
12768-4 is a WASHER,LOCK.
What parts can replace 12768-4?
There are 6 known substitutes for 12768-4: 13AD6D1084CPC29, D8904PC36, 3F1905PC48 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12768-4?
12768-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-209-1882. 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