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All Categories > Heli-Coil > Taps & Gages > Tanged STI Taps > Straight Flute Taps > Plug Style - (4 Thread Chamfer) > 3B Straight Flute Plug Unified Coarse STI Taps > View Items  

3B Straight Flute Plug Unified Coarse 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

01CPB 1(.073)-64 1-13/16 in 1/2 in 3/16 in .141 in .110 in
02CPB 2(.086)-56 1-7/8 in 9/16 in 3/16 in .141 in .110 in
03CPB 3(.099)-48 1-15/16 in 5/8 in 3/16 in .141 in .110 in
04CPB 4(.112)-40 2 in 11/16 in 3/16 in .141 in .110 in
05CPB 5(.125)-40 2-1/8 in 3/4 in 1/4 in .168 in .131 in
06CPB 6(.138)-32 2-3/8 in 7/8 in 1/4 in .168 in .131 in
2CPB 8(.164)-32 2-3/8 in 15/16 in 9/32 in .220 in .165 in
3CPB 10(.190)-24 2-1/2 in 1 in 5/16 in .255 in .191 in
1CPB 12(.216)-24 2-23/32 in 1-1/8 in 3/8 in .318 in .238 in
4CPB 1/4(.2500)-20 2-23/32 in 1-1/8 in 3/8 in .318 in .238 in
5CPB 5/16(.3125)-18 2-15/16 in 1-1/4 in 7/16 in .381 in .286 in
6CPB 3/8(.3750)-16 3-3/8 in 1-21/32 in 1/16 in .367 in .275 in
7CPB 7/16(.4375)-14 3-19/32 in 1-21/32 in 1/2 in .429 in .322 in
8CPB 1/2(.5000)-13 3-13/16 in 1-13/16 in 9/16 in .480 in .360 in
187-9 9/16(.5625)-12 4-1/32 in 1-13/16 in 5/8 in .542 in .406 in
8187-10 5/8(.6250)-11 4-1/4 in 2 in 11/16 in .590 in .442 in
8187-12 3/4(.7500)-10 4-11/16 in 2-7/32 in 3/4 in .697 in .523 in
8187-14 7/8(.8750)-9 5-1/18 in 2-1/2 in 13/16 in .800 in .600 in
8187-16 1(1.0000)-8 5-3/4 in 2-9/16 in 1 in 1.021 in .766 in
8187-18 1-1/8(1.1250)-7 6-1/16 in 3 in 1-1/16 in 1.108 in .831 in
8187-20 1-1/4(1.2500)-7 6-3/8 in 3 in 1-1/8 in 1.233 in .925 in
8187-22 1-3/8(1.3750)-6 6-11/16 in 3-3/16 in 1-1/8 in 1.305 in .979 in
8187-24 1-1/2(1.5000)-6 7 in 3-3/16 in 1-1/4 in 1.430 in 1.072 in
  Results 1 - 23 of 23 1