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Technical Data Sheet
PartsTable / COMPONENT / MS21261R304
MS21261R304 ✓ 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 COMP 2330 OR STEEL COMP 4130 OR STEEL COMP 8630 OVERALL, thickness: 0.0938 INCHES MINIMUM AND 0.0948 INCHES MAXIMUM IN, key_height: 0.198 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN, shear_strength: 100000 SINGLE POUNDS PER SQUARE INCH, circle_diameter: 0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-205-7182, 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
MS21261R304
NSN: 5315-00-205-7182
FSC: 5315
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 2330 OR STEEL COMP 4130 OR STEEL COMP 8630 OVERALL
thickness0.0938 INCHES MINIMUM AND 0.0948 INCHES MAXIMUM IN
key_height0.198 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
shear_strength100000 SINGLE POUNDS PER SQUARE INCH
circle_diameter0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
style_designatorROUND BOTTOM
starting_edge_shapeSTRAIGHT
key_size_designationWOODRUFF 2
NSN5315-00-205-7182
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS21261R304 · 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: 0.198 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
•
KEY SIZE DESIGNATION: WOODRUFF 2
•
STARTING EDGE RADIUS: 0.008 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN
•
HARDNESS RATING: 45.0 ROCKWELL C MAXIMUM OVERALL
•
THICKNESS: 0.093 INCHES MINIMUM AND 0.094 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: ROUND BOTTOM
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
STARTING EDGE SHAPE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
KEY HEIGHT0.198 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
KEY SIZE DESIGNATIONWOODRUFF 2
STARTING EDGE RADIUS0.008 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN
HARDNESS RATING45.0 ROCKWELL C MAXIMUM OVERALL
THICKNESS0.093 INCHES MINIMUM AND 0.094 INCHES MAXIMUM IN
STYLE DESIGNATORROUND BOTTOM
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
STARTING EDGE SHAPEROUND
MATERIALSTEEL COMP 4130 OR STEEL COMP 8630 OVERALL
CIRCLE DIAMETER0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
901326Interchangeable
interchangeable cross-reference
interchangeable
1179AInterchangeable
interchangeable cross-reference
interchangeable
919B005-1Interchangeable
interchangeable cross-reference
interchangeable
AN280-304Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21261R304?
MS21261R304 is a KEY,WOODRUFF.
What parts can replace MS21261R304?
There are 4 known substitutes for MS21261R304: 901326, 1179A, 919B005-1 and 1 more. Substitute compatibility should be verified for your specific system.
Is MS21261R304 still available?
MS21261R304 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