① Spiral Fluted Tap Series for blind hole Overall length L Thread length ℓ Thread + Neck length ℓn Shank dia. Ds Size of square K Length of square ℓk ANSI ZELX NI SP Spiral Fluted Taps for Nickel Base Alloys L ℓ ℓn Ds K ℓk No. of Size Class Code Chamfer TYPE Spiral Fluted Taps (for blind hole) (inch) (inch) (inch) (inch) (inch) (inch) flutes ① 5/16-24UNF GH3 Y87516 3P 2.718 0.394 1.125 0.318 0.238 0.375 3 3 5/16-24UNF GH3 Y87577 1.5P 2.718 0.394 1.125 0.318 0.238 0.375 3 3 5/16-24UNF GH4 Y87532 3P 2.718 0.394 1.125 0.318 0.238 0.375 3 3 5/16-24UNF GH4 Y87032 1.5P 2.718 0.394 1.125 0.318 0.238 0.375 3 3 Spiral Fluted Taps (for through hole) 5/16-24UNF GH5 Y87546 3P 2.718 0.394 1.125 0.318 0.238 0.375 3 3 ② 5/16-24UNF GH6 Y87563 3P 2.718 0.394 1.125 0.318 0.238 0.375 3 3 5/16-24UNF GH7 Y87576 3P 2.718 0.394 1.125 0.318 0.238 0.375 3 3 3/8-16UNC GH3 Y87517 3P 2.937 0.551 1.25 0.381 0.286 0.437 3 3 3/8-16UNC GH3 Y87017 1.5P 2.937 0.551 1.25 0.381 0.286 0.437 3 3 Spiral Pointed Taps (for through hole) ③ 3/8-16UNC GH5 Y87547 3P 2.937 0.551 1.25 0.381 0.286 0.437 3 3 3/8-16UNC GH5 Y87047 1.5P 2.937 0.551 1.25 0.381 0.286 0.437 3 3 3/8-24UNF GH3 Y87518 3P 2.937 0.394 1.25 0.381 0.286 0.437 3 3 3/8-24UNF GH3 Y87575 1.5P 2.937 0.394 1.25 0.381 0.286 0.437 3 3 3/8-24UNF Hand Taps GH4 Y87533 3P 2.937 0.394 1.25 0.381 0.286 0.437 3 3 ④ 3/8-24UNF GH4 Y87033 1.5P 2.937 0.394 1.25 0.381 0.286 0.437 3 3 3/8-24UNF GH5 Y87548 3P 2.937 0.394 1.25 0.381 0.286 0.437 3 3 3/8-24UNF GH6 Y87564 3P 2.937 0.394 1.25 0.381 0.286 0.437 3 3 3/8-24UNF GH7 Y87578 3P 2.937 0.394 1.25 0.381 0.286 0.437 3 3 Cemented Carbide Taps 7/16-14UNC GH3 Y87519 3P 3.156 0.591 - 0.323 0.242 0.406 3 4 ⑤ 7/16-14UNC GH5 Y87549 3P 3.156 0.591 - 0.323 0.242 0.406 3 4 7/16-20UNF GH3 Y87520 3P 3.156 0.472 - 0.323 0.242 0.406 3 4 7/16-20UNF GH3 Y87573 1.5P 3.156 0.472 - 0.323 0.242 0.406 3 4 7/16-20UNF GH5 Y87550 3P 3.156 0.472 - 0.323 0.242 0.406 3 4 Roll Taps 7/16-20UNF ⑥ GH5 Y87050 1.5P 3.156 0.472 - 0.323 0.242 0.406 3 4 1/2-13UNC GH3 Y87521 3P 3.375 0.63 - 0.367 0.275 0.437 3 4 1/2-13UNC GH3 Y87500 1.5P 3.375 0.63 - 0.367 0.275 0.437 3 4 1/2-13UNC GH5 Y87551 3P 3.375 0.63 - 0.367 0.275 0.437 3 4 1/2-13UNC GH5 Y87051 1.5P 3.375 0.63 - 0.367 0.275 0.437 3 4 Special Thread Taps Simple Inspection Tools ⑦ 1/2-13UNC GH7 Y87581 3P 3.375 0.63 - 0.367 0.275 0.437 3 4 1/2-20UNF GH3 Y87522 3P 3.375 0.472 - 0.367 0.275 0.437 3 4 1/2-20UNF GH3 Y87022 1.5P 3.375 0.472 - 0.367 0.275 0.437 3 4 1/2-20UNF GH5 Y87552 3P 3.375 0.472 - 0.367 0.275 0.437 3 4 Pipe Taps 1/2-20UNF GH7 Y87582 3P 3.375 0.472 - 0.367 0.275 0.437 3 4 ⑧ 9/16-18UNF GH3 Y88554 3P 3.593 0.512 - 0.429 0.322 0.5 3 4 9/16-18UNF GH5 Y88542 3P 3.593 0.512 - 0.429 0.322 0.5 3 4 5/8-11UNC GH3 Y87525 3P 3.812 0.748 - 0.48 0.36 0.562 4 4 5/8-11UNC GH3 Y87025 1.5P 3.812 0.748 - 0.48 0.36 0.562 4 4 Thread Mills Premium Thread Mills 5/8-11UNC GH5 Y87555 3P 3.812 0.748 - 0.48 0.36 0.562 4 4 ⑨ 5/8-11UNC GH7 Y87585 3P 3.812 0.748 - 0.48 0.36 0.562 4 4 5/8-18UNF GH3 Y87526 3P 3.812 0.512 - 0.48 0.36 0.562 4 4 5/8-18UNF GH3 Y81508 1.5P 3.812 0.512 - 0.48 0.36 0.562 4 4 5/8-18UNF GH4 Y87536 3P 3.812 0.512 - 0.48 0.36 0.562 4 4 Dies ⑩ 5/8-18UNF GH5 Y87556 3P 3.812 0.512 - 0.48 0.36 0.562 4 4 3/4-10UNC GH3 Y87527 3P 4.25 0.827 - 0.59 0.442 0.687 4 4 3/4-10UNC GH3 Y87027 1.5P 4.25 0.827 - 0.59 0.442 0.687 4 4 3/4-10UNC GH5 Y87557 3P 4.25 0.827 - 0.59 0.442 0.687 4 4 3/4-16UNF GH3 Y87528 3P 4.25 0.591 - 0.59 0.442 0.687 4 4 Center Drills Centering Tools ⑪ 3/4-16UNF GH5 Y87558 3P 4.25 0.591 - 0.59 0.442 0.687 4 4 ANSI ①-163 ※ This product is different from JIS products in shape and dimensions, please be careful when using.