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Technical Data Sheet
PartsTable / COMPONENT / L-56
L-56 ✓ 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

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include material: STEEL COMP 416 OVERALL, unit_type: BICUSPID AND LOWER, bore_shape: STRAIGHT, bore_diameter: 7.0000 INCHES NOMINAL IN, hole_diameter: 0.318 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN, overall_width: 0.250 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-010-3320, 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
L-56
NSN: 5310-00-010-3320
FSC: 5310
CAGE: 72540 — DAYTON-WALTHER CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 416 OVERALL
unit_typeBICUSPID AND LOWER
bore_shapeSTRAIGHT
bore_diameter7.0000 INCHES NOMINAL IN
hole_diameter0.318 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
overall_width0.250 INCHES NOMINAL IN
indicator_typeMETER
load_directionRADIAL
overall_length4.400 INCHES NOMINAL IN
surface_finishGROUND
hardness_rating45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
outside_diameter0.586 INCHES MAXIMUM IN
NSN5310-00-010-3320
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: L-56 · 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
•
MATERIAL THICKNESS: 0.078 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
•
NONDEFINITIVE SPEC/STD DATA: 2 STYLE AND A CLASS
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
HOLE DIAMETER: 0.318 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.586 INCHES MAXIMUM IN
•
HARDNESS RATING: 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL THICKNESS0.078 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATA2 STYLE AND A CLASS
MATERIALSTEEL CORROSION RESISTING OVERALL
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
HOLE DIAMETER0.318 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.586 INCHES MAXIMUM IN
HARDNESS RATING45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
316-1-2PInterchangeable
interchangeable cross-reference
interchangeable
615AInterchangeable
interchangeable cross-reference
interchangeable
40049Interchangeable
interchangeable cross-reference
interchangeable
X528Interchangeable
interchangeable cross-reference
interchangeable
M22520/10-104Interchangeable
interchangeable cross-reference
interchangeable
MIL-C-22520/10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is L-56?
L-56 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace L-56?
There are 29 known substitutes for L-56: 316-1-2P, 615A, 40049 and 26 more. Substitute compatibility should be verified for your specific system.
Is L-56 still available?
L-56 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