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226121-3-4-6 — COUNTERBORE,HAND

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

226121-3-4-6: COUNTERBORE,HAND.

The COUNTERBORE,HAND is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, shank_style: STRAIGHT ROUNDSTRAIGHT ROUND, overall_length: 3.563 INCHES NOMINAL3.563 INCHES NOMINAL IN, pilot_diameter: 0.184 INCHES MINIMUM AND 0.184 INCHES MINIMUM AND 0.187 INCHES MAXIMUM0.187 INCHES MAXIMUM IN, shank_diameter: 0.400 INCHES NOMINAL0.400 INCHES NOMINAL IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM53.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5133-00-243-3606, 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
226121-3-4-6
NSN: 5133-00-243-3606
FSC: 5133 — Drill Bits, Counterbores, and Countersinks: Hand and Machine
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL OVERALL
shank_styleSTRAIGHT ROUNDSTRAIGHT ROUND
overall_length3.563 INCHES NOMINAL3.563 INCHES NOMINAL IN
pilot_diameter0.184 INCHES MINIMUM AND 0.184 INCHES MINIMUM AND 0.187 INCHES MAXIMUM0.187 INCHES MAXIMUM IN
shank_diameter0.400 INCHES NOMINAL0.400 INCHES NOMINAL IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM53.0 ROCKWELL C MAXIMUM
cutting_end_styleSOLIDSOLID
features_providedHANDLE AND HANDLE AND INTEGRAL PILOTINTEGRAL PILOT
nominal_cutting_diameter0.4320 INCHES0.4320 INCHES IN
pilot_hole_nominal_diameter0.125 INCHES0.125 INCHES IN
NSN5133-00-243-3606
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available COUNTERBORE,HAND TITLE COMPONENT PN 226121-3-4-6 MFR COUNTERBORE,HAND
KEY FEATURES
•
SHANK DIAMETER: 0.400 INCHES NOMINAL0.400 INCHES NOMINAL IN
•
CUTTING END STYLE: SOLIDSOLID
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM53.0 ROCKWELL C MAXIMUM
•
NOMINAL CUTTING DIAMETER: 0.4320 INCHES0.4320 INCHES IN
•
FEATURES PROVIDED: HANDLE AND HANDLE AND INTEGRAL PILOTINTEGRAL PILOT
•
PILOT DIAMETER: 0.184 INCHES MINIMUM AND 0.184 INCHES MINIMUM AND 0.187 INCHES MAXIMUM0.187 INCHES MAXIMUM IN
•
SHANK STYLE: STRAIGHT ROUNDSTRAIGHT ROUND
TECHNICAL CHARACTERISTICS
SHANK DIAMETER0.400 INCHES NOMINAL0.400 INCHES NOMINAL IN
CUTTING END STYLESOLIDSOLID
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM53.0 ROCKWELL C MAXIMUM
OVERALL LENGTH3.563 INCHES NOMINAL3.563 INCHES NOMINAL IN
NOMINAL CUTTING DIAMETER0.4320 INCHES0.4320 INCHES IN
FEATURES PROVIDEDHANDLE AND HANDLE AND INTEGRAL PILOTINTEGRAL PILOT
PILOT DIAMETER0.184 INCHES MINIMUM AND 0.184 INCHES MINIMUM AND 0.187 INCHES MAXIMUM0.187 INCHES MAXIMUM IN
SHANK STYLESTRAIGHT ROUNDSTRAIGHT ROUND
PILOT HOLE NOMINAL DIAMETER0.125 INCHES0.125 INCHES IN
MATERIALSTEEL OVERALL
OTHER ITEMS IN FSC 5133 — Drill Bits, Counterbores, and Countersinks: Hand and Machine
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5133-00-001-1296 5133-00-001-1298 5133-00-005-2258 5133-00-005-7727 5133-00-005-8710 5133-00-005-8711 5133-00-005-8712 5133-00-005-8713
SUBSTITUTES & CROSS-REFERENCES 1
WA2077Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 226121-3-4-6?
226121-3-4-6 is a COUNTERBORE,HAND.
What parts can replace 226121-3-4-6?
There is 1 known substitute for 226121-3-4-6: WA2077. Substitute compatibility should be verified for your specific system.
What is the NSN for 226121-3-4-6?
226121-3-4-6 is cataloged in the U.S. Government catalog under NSN 5133-00-243-3606. 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.