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12Y6226 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

12Y6226: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include thickness: 0.250 INCHES NOMINAL IN, hole_diameter: 0.562 INCHES NOMINAL IN, overall_diameter: 3.750 INCHES NOMINAL IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND, cross-sectional_shape_style: RECTANGULAR. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-512-5213, 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
12Y6226
NSN: 5310-00-512-5213
FSC: 5310 — Nuts and Washers
CAGE: 33323 — KENWORTH TRUCK CO A DIV OF PACCAR INC (USA)
SPECIFICATIONS
materialSTEEL OR STEEL COMP 1010 OR STEEL COMP 1012 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
thickness0.250 INCHES NOMINAL IN
hole_diameter0.562 INCHES NOMINAL IN
overall_diameter3.750 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-S-741 FED SPEC 1ST MATERIAL RESPONSE OR ASTM A36 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A108 ASSN STD ALL MATERIAL RESPONSES OR AISI ASSN STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-512-5213
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12Y6226 · 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
•
OVERALL DIAMETER: 3.750 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-741 FED SPEC 1ST MATERIAL RESPONSE OR ASTM A36 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A108 ASSN STD ALL MATERIAL RESPONSES OR AISI ASSN STD ALL MATERIAL RESPONSES OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OR STEEL COMP 1010 OR STEEL COMP 1012 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.562 INCHES NOMINAL IN
•
THICKNESS: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER3.750 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-741 FED SPEC 1ST MATERIAL RESPONSE OR ASTM A36 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A108 ASSN STD ALL MATERIAL RESPONSES OR AISI ASSN STD ALL MATERIAL RESPONSES OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL OR STEEL COMP 1010 OR STEEL COMP 1012 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.562 INCHES NOMINAL IN
THICKNESS0.250 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 6
2188812Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
27UV0617Reference document
Same NSN cross-reference
Reference document — Secondary reference
27UV0616Reference document
Same NSN cross-reference
Reference document — Secondary reference
GTB19067Reference document
Same NSN cross-reference
Reference document — Secondary reference
380957008Reference document
Same NSN cross-reference
Reference document — Secondary reference
364709Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12Y6226?
12Y6226 is a WASHER,FLAT.
What parts can replace 12Y6226?
There are 6 known substitutes for 12Y6226: 2188812, 27UV0617, 27UV0616 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12Y6226?
12Y6226 is cataloged in the U.S. Government catalog under NSN 5310-00-512-5213. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.