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Cleveland thread forming tap 1/4-28 UNF HSS bright finish H4 2B

Cleveland

Cleveland C59290 Thread Forming Tap 1/4-28 UNF HSS Bright H4 2B

SKU CH-70R9-N9S6P

Forms UNF threads in 1/4-28 holes using HSS bright H4 tooling for 2B fit

  • TypeTaps
  • Forms threads without chips for cleaner holes
  • High-speed steel resists wear during repeated use
  • H4 limit matches 2B class fit requirements
  • 75 percent thread depth suits 5.90 mm drill size
  • Right-hand UNF pattern fits standard 1/4-28 applications

Cleveland C59290 Thread Forming Tap

The Cleveland C59290 is a thread forming tap designed for creating internal threads in ductile materials. It suits machinists and maintenance technicians who require chipless threading in a workshop or field setting.

Bottoming Chamfer and Bright Finish

The bottoming chamfer allows threading close to the bottom of a blind hole. The bright, uncoated high-speed steel surface provides a clean cutting action without coating buildup for general-purpose applications.

Verify Thread Specification and Drill Size

Confirm the workpiece material is suitable for cold forming and that the 1/4-28 UNF thread specification matches the required fit class. Ensure the tap drill size aligns with the 75 percent thread depth requirement for proper thread formation.

Highlights

  • Forms threads without chips for cleaner holes
  • High-speed steel resists wear during repeated use
  • H4 limit matches 2B class fit requirements
  • 75 percent thread depth suits 5.90 mm drill size
  • Right-hand UNF pattern fits standard 1/4-28 applications

Specifications

BrandCLEVELAND
TypeTaps

Questions about this item

How often will the HSS bright tap need replacement when forming 1/4-28 UNF threads?

The H4 high-speed steel tap resists wear well in standard materials; replace it when thread gauges show the 2B fit is exceeded or when forming torque rises noticeably.

What limits continuous use of this thread forming tap?

Chip evacuation in the fluteless design becomes the practical limit during long runs; clear the formed material frequently to avoid binding.

Does the uncoated tap generate excess heat during all-day threading?

Bright HSS runs warmer than coated taps; use cutting fluid and the 5.90 mm drill size to keep temperatures manageable during extended sessions.

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