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Technical Data Sheet
PartsTable / COMPONENT / 7521044
7521044 ✓ 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,WOODRUFF is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.312 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN, key_height: 0.401 INCHES MINIMUM AND 0.406 INCHES MAXIMUM IN, overall_length: 1.370 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN, circle_diameter: 2.115 INCHES MINIMUM AND 2.125 INCHES MAXIMUM IN, hardness_rating: 10.0 ROCKWELL C MINIMUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-045-2563, 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
7521044
NSN: 5315-00-045-2563
FSC: 5315
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.312 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
key_height0.401 INCHES MINIMUM AND 0.406 INCHES MAXIMUM IN
overall_length1.370 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN
circle_diameter2.115 INCHES MINIMUM AND 2.125 INCHES MAXIMUM IN
hardness_rating10.0 ROCKWELL C MINIMUM OVERALL
style_designatorROUND BOTTOM RELIEVED ENDS
starting_edge_shapeSTRAIGHT
key_size_designationWOODRUFF 128
material_document_and_classificationQQ-S-633 1030 TO 1060 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5315-00-045-2563
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 7521044 · 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
•
KEY HEIGHT: 0.401 INCHES MINIMUM AND 0.406 INCHES MAXIMUM IN
•
CIRCLE DIAMETER: 2.115 INCHES MINIMUM AND 2.125 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
HARDNESS RATING: 10.0 ROCKWELL C MINIMUM OVERALL
•
THICKNESS: 0.312 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
•
STARTING EDGE SHAPE: STRAIGHT
•
STYLE DESIGNATOR: ROUND BOTTOM RELIEVED ENDS
TECHNICAL CHARACTERISTICS (FLIS)
KEY HEIGHT0.401 INCHES MINIMUM AND 0.406 INCHES MAXIMUM IN
CIRCLE DIAMETER2.115 INCHES MINIMUM AND 2.125 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
OVERALL LENGTH1.370 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN
HARDNESS RATING10.0 ROCKWELL C MINIMUM OVERALL
THICKNESS0.312 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
STARTING EDGE SHAPESTRAIGHT
STYLE DESIGNATORROUND BOTTOM RELIEVED ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633 1030 TO 1060 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
KEY SIZE DESIGNATIONWOODRUFF 128
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
L-4-18-9-MInterchangeable
interchangeable cross-reference
interchangeable
433-1792Interchangeable
interchangeable cross-reference
interchangeable
418212-40Interchangeable
interchangeable cross-reference
interchangeable
11502340Interchangeable
interchangeable cross-reference
interchangeable
43-3137Interchangeable
interchangeable cross-reference
interchangeable
215305Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 7521044?
7521044 is a KEY,WOODRUFF.
What parts can replace 7521044?
There are 11 known substitutes for 7521044: L-4-18-9-M, 433-1792, 418212-40 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 7521044?
7521044 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-045-2563. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026