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Technical Data Sheet
PartsTable / COMPONENT / 6L3903-4
6L3903-4 ✓ 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 PIN,GROOVED,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL COMP B1112 OR STEEL COMP 1112 OR STEEL COMP 1212 OVERALL, overall_length: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, shear_strength: 220 DOUBLE POUNDS PER SQUARE INCH, first_end_style: SQUARE, style_designator: FULL LENGTH GROOVE, surface_treatment: CADMIUM OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-290-3681, 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
6L3903-4
NSN: 5315-00-290-3681
FSC: 5315
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
materialSTEEL COMP B1112 OR STEEL COMP 1112 OR STEEL COMP 1212 OVERALL
overall_length0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
shear_strength220 DOUBLE POUNDS PER SQUARE INCH
first_end_styleSQUARE
style_designatorFULL LENGTH GROOVE
surface_treatmentCADMIUM OVERALL
first_end_locationBOTH ENDS
pin_large_end_diameter0.050 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN
pin_small_end_diameter0.0459 INCHES MINIMUM AND 0.0469 INCHES MAXIMUM IN
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
second_end_relationship_with_first_endIDENTICAL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5315-00-290-3681
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6L3903-4 · 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
•
PIN LARGE END DIAMETER: 0.050 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN
•
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
•
FIRST END STYLE: SQUARE
•
SHEAR STRENGTH: 220 DOUBLE POUNDS PER SQUARE INCH
•
FIRST END LOCATION: BOTH ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
PIN SMALL END DIAMETER: 0.0459 INCHES MINIMUM AND 0.0469 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
PIN LARGE END DIAMETER0.050 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
FIRST END STYLESQUARE
SHEAR STRENGTH220 DOUBLE POUNDS PER SQUARE INCH
FIRST END LOCATIONBOTH ENDS
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
PIN SMALL END DIAMETER0.0459 INCHES MINIMUM AND 0.0469 INCHES MAXIMUM IN
OVERALL LENGTH0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
MATERIALSTEEL COMP B1112 OR STEEL COMP 1112 OR STEEL COMP 1212 OVERALL
STYLE DESIGNATORFULL LENGTH GROOVE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
140011Interchangeable
interchangeable cross-reference
interchangeable
MB1096P5Interchangeable
interchangeable cross-reference
interchangeable
MB1075-4PC5Interchangeable
interchangeable cross-reference
interchangeable
MB1075-5PC5Interchangeable
interchangeable cross-reference
interchangeable
611754Interchangeable
interchangeable cross-reference
interchangeable
11754Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 6L3903-4?
6L3903-4 is a PIN,GROOVED,HEADLESS.
What parts can replace 6L3903-4?
There are 18 known substitutes for 6L3903-4: 140011, MB1096P5, MB1075-4PC5 and 15 more. Substitute compatibility should be verified for your specific system.
Is 6L3903-4 still available?
6L3903-4 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