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Technical Data Sheet
PartsTable / COMPONENT / 4912550-03
4912550-03 ✓ 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 302 OVERALL, hole_diameter: 0.194 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN, hardness_rating: 35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM, outside_diameter: 0.337 INCHES NOMINAL IN, style_designator: SPLIT HELICAL-RIGHT HAND, 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 (FLIS) under NSN 5310-00-510-4304, 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
4912550-03
NSN: 5310-00-510-4304
FSC: 5310
CAGE: 03956 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OVERALL
hole_diameter0.194 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN
hardness_rating35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
outside_diameter0.337 INCHES NOMINAL IN
style_designatorSPLIT HELICAL-RIGHT HAND
surface_treatmentPASSIVATE OVERALL
material_thickness0.047 INCHES MINIMUM AND 0.053 INCHES MAXIMUM IN
nondefinitive_spec/std_dataB CLASS AND 2 STYLE
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-F-14072 FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-510-4304
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4912550-03 · 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
•
NONDEFINITIVE SPEC/STD DATA: B CLASS AND 2 STYLE
•
HOLE DIAMETER: 0.194 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
MATERIAL: STEEL COMP 302 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.337 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.047 INCHES MINIMUM AND 0.053 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NONDEFINITIVE SPEC/STD DATAB CLASS AND 2 STYLE
HOLE DIAMETER0.194 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
MATERIALSTEEL COMP 302 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.337 INCHES NOMINAL IN
MATERIAL THICKNESS0.047 INCHES MINIMUM AND 0.053 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-F-14072 FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
HARDNESS RATING35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
310-0073-000Interchangeable
interchangeable cross-reference
interchangeable
24-00202-138Interchangeable
interchangeable cross-reference
interchangeable
6931056 ITEM 32Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4912550-03?
4912550-03 is a WASHER,LOCK.
What parts can replace 4912550-03?
There are 3 known substitutes for 4912550-03: 310-0073-000, 24-00202-138, 6931056 ITEM 32. Substitute compatibility should be verified for your specific system.
What is the NSN for 4912550-03?
4912550-03 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-510-4304. 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