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Roughing Unified Coarse Thread STI Taps

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Straight Flute Taps. Widely used for general hand and machine tapping operations. Available in sizes up to 1-1/2".
  • Plug Style-(4 Thread Chamfer). Used in thru holes and blind holes that allow for ample chip clearance. Easier to start and require less tapping torque than bottoming taps.
  • Bottoming Style - (2 Thread Chamfer). Used in blind holes drilled to a minimum depth that requires threads be close to the bottom of the hole.


Spiral Pointed- Plug & Spiral Flute. Used for efficient chip disposal in production tapping operations. Available in sizes upto 1/2".
  • Spiral Pointed - Plug (4 Thread Chamfer).Widely used in long thru holes and blind holes with ample chip clearance. Incorporates an angular grind at the point end of the tap which shears chips and drives them forward of the tap. They are free cutting and provide increased tap strength. Not recommended for abrasive materials.




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Item #

Nominal Thread Size

Tap Dimensions Length Overall A

Tap Dimensions Length of Thread B

Tap Dimensions Length of Square C

Tap Dimensions Maximum Diameter of Shank D

Tap Dimensions Maximum Size of Square

7CRU 7/16(.4375)-14 3-19/32 in 1-21/32 in 1/2 in .429 in .322 in
8CRU 1/2(.5000)-13 3-13/16 in 1-13/16 in 9/16 in .480 in .360 in
9CRU 9/16(.5625)-12 4-1/32 in 1-13/16 in 5/8 in .542 in .406 in
10CRU 5/8(.6250)-11 4-1/4 in 2 in 11/16 in .590 in .442 in
12CRU 3/4(.7500)-10 4-11/16 in 2-7/32 in 3/4 in .697 in .523 in
14CRU 7/8(.8750)-9 5-1/18 in 2-1/2 in 13/16 in .800 in .600 in
16CRU 1(1.0000)-8 5-3/4 in 2-9/16 in 1 in 1.021 in .766 in
  Results 1 - 7 of 7 1