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PartsTable / COMPONENT / AN280-304
AN280-304 ✓ 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 4130 OR STEEL COMP 8630 OVERALL, thickness: 0.093 INCHES MINIMUM AND 0.094 INCHES MAXIMUM IN, key_height: 0.198 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN, circle_diameter: 0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN, hardness_rating: 45.0 ROCKWELL C MAXIMUM OVERALL, style_designator: ROUND BOTTOM. 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
AN280-304
NSN: 5315-00-205-7182
FSC: 5315
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OR STEEL COMP 8630 OVERALL
thickness0.093 INCHES MINIMUM AND 0.094 INCHES MAXIMUM IN
key_height0.198 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
circle_diameter0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
hardness_rating45.0 ROCKWELL C MAXIMUM OVERALL
style_designatorROUND BOTTOM
starting_edge_shapeROUND
key_size_designationWOODRUFF 2
starting_edge_radius0.008 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5315-00-205-7182
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: AN280-304 · 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
MS21261R304Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN280-304?
AN280-304 is a KEY,WOODRUFF.
What parts can replace AN280-304?
There are 4 known substitutes for AN280-304: 901326, 1179A, 919B005-1 and 1 more. Substitute compatibility should be verified for your specific system.
Is AN280-304 still available?
AN280-304 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