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Technical Data Sheet
PartsTable / COMPONENT / 16X51
16X51 ✓ 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 KEY,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 3135 OVERALL, overall_width: 0.4995 INCHES MINIMUM AND 0.5005 INCHES MAXIMUM IN, overall_height: 0.3724 INCHES MINIMUM AND 0.3776 INCHES MAXIMUM IN, overall_length: 2.500 INCHES NOMINAL IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL, style_designator: PLAIN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-271-6649, 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
16X51
NSN: 5315-00-271-6649
FSC: 5315
CAGE: 3D6E9 — MERITOR INDUSTRIAL PRODUCTS, LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 3135 OVERALL
overall_width0.4995 INCHES MINIMUM AND 0.5005 INCHES MAXIMUM IN
overall_height0.3724 INCHES MINIMUM AND 0.3776 INCHES MAXIMUM IN
overall_length2.500 INCHES NOMINAL IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
style_designatorPLAIN
starting_edge_shapeSTRAIGHT
material_document_and_classificationQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5315-00-271-6649
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 16X51 · 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
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
STARTING EDGE SHAPE: STRAIGHT
•
STYLE DESIGNATOR: PLAIN
•
MATERIAL: STEEL COMP 3135 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL HEIGHT0.3724 INCHES MINIMUM AND 0.3776 INCHES MAXIMUM IN
OVERALL LENGTH2.500 INCHES NOMINAL IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OVERALL WIDTH0.4995 INCHES MINIMUM AND 0.5005 INCHES MAXIMUM IN
STARTING EDGE SHAPESTRAIGHT
STYLE DESIGNATORPLAIN
MATERIALSTEEL COMP 3135 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
6W0445Interchangeable
interchangeable cross-reference
interchangeable
P2475Interchangeable
interchangeable cross-reference
interchangeable
5214646Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 16X51?
16X51 is a KEY,MACHINE.
What parts can replace 16X51?
There are 3 known substitutes for 16X51: 6W0445, P2475, 5214646. Substitute compatibility should be verified for your specific system.
Is 16X51 still available?
16X51 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