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PartsTable / COMPONENT / 1229-S-721
1229-S-721 ✓ 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,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 2.263 INCHES NOMINAL IN, outside_diameter: 3.310 INCHES NOMINAL IN, style_designator: KEY, material_thickness: 0.060 INCHES NOMINAL IN, internal_straight_key_width: 0.242 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-359-1334, 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
1229-S-721
NSN: 5310-00-359-1334
FSC: 5310
CAGE: 97286 — ROCKWELL INTERNATIONAL CORP INDUSTRIAL PRODUCTS GROUP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter2.263 INCHES NOMINAL IN
outside_diameter3.310 INCHES NOMINAL IN
style_designatorKEY
material_thickness0.060 INCHES NOMINAL IN
internal_key_quantity1
internal_straight_key_width0.242 INCHES NOMINAL IN
distance_from_centerline_to_top_of_internal_key1.010 INCHES NOMINAL IN
NSN5310-00-359-1334
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1229-S-721 · 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
•
INTERNAL STRAIGHT KEY WIDTH: 0.242 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 2.263 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.060 INCHES NOMINAL IN
•
INTERNAL KEY QUANTITY: 1
•
OUTSIDE DIAMETER: 3.310 INCHES NOMINAL IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 1.010 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
TECHNICAL CHARACTERISTICS (FLIS)
INTERNAL STRAIGHT KEY WIDTH0.242 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
HOLE DIAMETER2.263 INCHES NOMINAL IN
MATERIAL THICKNESS0.060 INCHES NOMINAL IN
INTERNAL KEY QUANTITY1
OUTSIDE DIAMETER3.310 INCHES NOMINAL IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY1.010 INCHES NOMINAL IN
STYLE DESIGNATORKEY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
5261Interchangeable
interchangeable cross-reference
interchangeable
71264205-01Interchangeable
interchangeable cross-reference
interchangeable
SMB657092Interchangeable
interchangeable cross-reference
interchangeable
526Interchangeable
interchangeable cross-reference
interchangeable
FD65Interchangeable
interchangeable cross-reference
interchangeable
593Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1229-S-721?
1229-S-721 is a WASHER,KEY.
What parts can replace 1229-S-721?
There are 19 known substitutes for 1229-S-721: 5261, 71264205-01, SMB657092 and 16 more. Substitute compatibility should be verified for your specific system.
Is 1229-S-721 still available?
1229-S-721 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