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Straight flute hand tap, bright uncoated finish, H11 thread limit

Greenfield Threading

Greenfield Threading 313534 shelving 1/2"-20 UNF H11

SKU CH-8D57-RF3FC

A straight-flute hand tap for cutting 1/2"-20 UNF threads with an H11 limit

  • 1/2"-20 UNF fine threading for precise fits
  • H11 thread limit ensures accurate class 1B tolerance
  • High-speed steel construction resists wear during tapping
  • Three-flute design clears chips efficiently in blind holes
  • Bright uncoated finish suits general-purpose hand tapping

Straight Flute Hand Tap 1/2"-20 UNF

This Greenfield Threading 313534 is a new straight flute hand tap designed for creating unified fine threads. It suits machinists and maintenance technicians who need to cut or repair internal threads in a workshop or garage setting.

Thread limit H11 class 1B fit

The tap conforms to a H11 thread limit with a class 1B fit, which determines the allowance and tolerance of the finished thread. This single specification decides whether the tool produces the correct thread profile for the application.

Requires 11.40 mm drill for 75 percent thread

The tap needs a 11.40 mm drill size to prepare a hole for 75 percent thread engagement. It frees the user from powered tapping equipment, operating by hand with a suitable wrench for right-hand thread direction.

Highlights

  • 1/2"-20 UNF fine threading for precise fits
  • H11 thread limit ensures accurate class 1B tolerance
  • High-speed steel construction resists wear during tapping
  • Three-flute design clears chips efficiently in blind holes
  • Bright uncoated finish suits general-purpose hand tapping

Specifications

BrandGREENFIELD THREADING

Questions about this item

What does the H11 thread limit mean for the threads I cut?

The H11 limit places the pitch diameter above basic size to produce a class 1B fit, giving generous clearance for easy assembly of 1/2"-20 UNF fasteners.

How does the 75 percent thread depth affect the holes I drill?

The 75 percent thread depth calls for a 11.40 mm drill size, leaving enough material for strong threads while reducing tapping torque in a 1/2"-20 UNF hole.

What clearance do I need for the 3 3/8 inch overall length?

The tap measures 3 3/8 inches overall with a 1 5/8 inch thread length, so allow at least that much depth plus handle room in your workpiece or fixture.

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