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Technical Data Sheet
PartsTable / COMPONENT / 31-P-58
31-P-58 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include hole_diameter: 0.406 INCHES MINIMUM AND 0.421 INCHES MAXIMUM IN, hardness_rating: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM, outside_diameter: 0.625 INCHES MINIMUM AND 0.640 INCHES MAXIMUM IN, style_designator: KEY, material_thickness: 0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN, external_prebent_key_width: 0.108 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-186-0959, 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
31-P-58
NSN: 5310-00-186-0959
FSC: 5310
CAGE: 77297 — PITOMETER CO INC
SPECIFICATIONS
materialSTEEL COMP 1010 OR STEEL COMP 4320H OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OVERALL
hole_diameter0.406 INCHES MINIMUM AND 0.421 INCHES MAXIMUM IN
hardness_rating50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
outside_diameter0.625 INCHES MINIMUM AND 0.640 INCHES MAXIMUM IN
style_designatorKEY
material_thickness0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
external_key_quantity9
external_prebent_key_width0.108 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN
internal_prebent_key_width0.110 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
internal_prebent_key_length0.062 INCHES MINIMUM AND 0.093 INCHES MAXIMUM IN
departure_from_cited_documentAS MODIFIED BY EXTERNALPREBENT KEY WIDTH
overall_distance_including_keys0.875 INCHES MAXIMUM IN
NSN5310-00-186-0959
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 31-P-58 · 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: 0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.406 INCHES MINIMUM AND 0.421 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEY
•
DEPARTURE FROM CITED DOCUMENT: AS MODIFIED BY EXTERNALPREBENT KEY WIDTH
•
OUTSIDE DIAMETER: 0.625 INCHES MINIMUM AND 0.640 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD ALL MATERIAL RESPONSES OVERALL
•
MATERIAL: STEEL COMP 1010 OR STEEL COMP 4320H OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OVERALL
•
INTERNAL PREBENT KEY WIDTH: 0.110 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL THICKNESS0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
HOLE DIAMETER0.406 INCHES MINIMUM AND 0.421 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
DEPARTURE FROM CITED DOCUMENTAS MODIFIED BY EXTERNALPREBENT KEY WIDTH
OUTSIDE DIAMETER0.625 INCHES MINIMUM AND 0.640 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD ALL MATERIAL RESPONSES OVERALL
MATERIALSTEEL COMP 1010 OR STEEL COMP 4320H OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OVERALL
INTERNAL PREBENT KEY WIDTH0.110 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY9
INTERNAL PREBENT KEY LENGTH0.062 INCHES MINIMUM AND 0.093 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
3158-311Interchangeable
interchangeable cross-reference
interchangeable
56600Interchangeable
interchangeable cross-reference
interchangeable
14287Interchangeable
interchangeable cross-reference
interchangeable
B94.9Interchangeable
interchangeable cross-reference
interchangeable
GGG-T-70 TY1SEASTCInterchangeable
interchangeable cross-reference
interchangeable
10459Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 31-P-58?
31-P-58 is a WASHER,FLAT.
What parts can replace 31-P-58?
There are 24 known substitutes for 31-P-58: 3158-311, 56600, 14287 and 21 more. Substitute compatibility should be verified for your specific system.
Is 31-P-58 still available?
31-P-58 is currently cancelled.
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Last verified: July 2026