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Technical Data Sheet
PartsTable / COMPONENT / 51920H
51920H ✓ 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,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1008 OVERALL, hole_diameter: 0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN, hardness_rating: 52.0 ROCKWELL B MINIMUM OR 64.0 ROCKWELL B MAXIMUM, outside_diameter: 0.672 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: CADMIUM OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-358-8344, 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
51920H
NSN: 5310-00-358-8344
FSC: 5310
CAGE: 31007 — NAVISTAR INTERNATIONAL CORPORATION DBA NAVISTAR (USA)
SPECIFICATIONS
materialSTEEL COMP 1008 OVERALL
hole_diameter0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
hardness_rating52.0 ROCKWELL B MINIMUM OR 64.0 ROCKWELL B MAXIMUM
outside_diameter0.672 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentCADMIUM OVERALL
material_thickness0.047 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
external_prebent_key_length0.203 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
external_straight_key_width0.182 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN
external_straight_key_length0.141 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN
overall_distance_including_keys0.797 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
material_document_and_classificationAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-358-8344
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 51920H · 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
•
SURFACE TREATMENT: CADMIUM OVERALL
•
STYLE DESIGNATOR: KEY
•
MATERIAL: STEEL COMP 1008 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
EXTERNAL STRAIGHT KEY LENGTH: 0.141 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.672 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.047 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTCADMIUM OVERALL
STYLE DESIGNATORKEY
MATERIALSTEEL COMP 1008 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
EXTERNAL STRAIGHT KEY LENGTH0.141 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.672 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN
HOLE DIAMETER0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
MATERIAL THICKNESS0.047 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS0.797 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY LENGTH0.203 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
A950Interchangeable
interchangeable cross-reference
interchangeable
5310PL0951123Interchangeable
interchangeable cross-reference
interchangeable
805057Interchangeable
interchangeable cross-reference
interchangeable
P5333Interchangeable
interchangeable cross-reference
interchangeable
3004-1Interchangeable
interchangeable cross-reference
interchangeable
192032Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51920H?
51920H is a WASHER,KEY.
What parts can replace 51920H?
There are 25 known substitutes for 51920H: A950, 5310PL0951123, 805057 and 22 more. Substitute compatibility should be verified for your specific system.
Is 51920H still available?
51920H 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