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h stock standard, ) check stock EU, f check stock JP, m stock exhaustion
EG(STI) UNC TCTR Ø Hole Ø Code THCHT LF THL LU LS DCON K LK NOF Type Stock Intro
(tolerance) (mm) (mm) (chamfer) ( inch ) ( inch ) ( inch ) ( inch ) ( inch ) ( inch ) ( inch )
ANSI
STI No.2-56UNC GH2 2.35 2.4 Y87200 4.5P 1.875 0.335 0.562 - 0.14 0.11 0.187 2 030 f
GH1 3.1 3.13 Y87203 4.5P 2 0.413 0.687 - 0.14 0.11 0.187 3 030 f SP
STI No.4-40UNC
GH2 3.1 3.13 Y87204 4.5P 2 0.413 0.687 - 0.14 0.11 0.187 3 030 f
GH2 3.8 3.83 Y87208 4.5P 2.375 0.531 0.875 - 0.19 0.152 0.25 3 030 f
STI No.6-32UNC
GH3 3.8 3.83 Y87224 4.5P 2.375 0.531 0.875 - 0.19 0.152 0.25 3 030 f
SL
GH2 4.4 4.48 Y87210 4.5P 2.375 0.571 0.937 - 0.22 0.165 0.281 3 030 f
STI No.8-32UNC
GH3 4.4 4.48 Y87226 4.5P 2.375 0.571 0.937 - 0.22 0.165 0.281 3 030 f
GH2 5.2 5.23 Y87212 4.5P 2.5 0.591 1 - 0.26 0.191 0.312 3 030 f
STI No.10-24UNC
GH3 5.2 5.23 Y87228 4.5P 2.5 0.591 1 - 0.26 0.191 0.312 3 030 f
PO
GH2 6.8 6.81 Y87248 4.5P 2.718 0.669 1.125 - 0.32 0.238 0.375 3 030 f
STI 1/4-20UNC
GH3 6.8 6.81 Y87258 4.5P 2.718 0.669 1.125 - 0.32 0.238 0.375 3 030 f
GH3 8.4 8.43 Y87260 4.5P 2.937 0.748 1.25 - 0.38 0.286 0.437 3 030 f
STI 5/16-18UNC
GH4 8.4 8.43 Y87272 4.5P 2.937 0.748 1.25 - 0.38 0.286 0.437 3 030 f ST
GH3 10 10.06 Y87262 4.5P 3.375 0.984 - - 0.37 0.275 0.437 3 006 f
STI 3/8-16UNC
GH4 10 10.06 Y87270 4.5P 3.375 0.984 - - 0.37 0.275 0.437 3 006 f
STI 7/16-14UNC GH3 11.7 11.71 Y87264 4.5P 3.593 0.984 - - 0.43 0.322 0.5 3 006 f
ROLL
STI 1/2-13UNC GH3 13.2 13.33 Y87266 4.5P 3.812 1.083 - - 0.48 0.36 0.562 3 006 f
EG(STI) UNF TCTR Ø Hole Ø Code THCHT LF THL LU LS DCON K LK NOF Type Stock
(tolerance) (mm) (mm) (chamfer) ( inch ) ( inch ) ( inch ) ( inch ) ( inch ) ( inch ) ( inch )
ANSI
CARBIDE
STI No.6-40UNF GH2 3.7 3.77 Y87209 4.5P 2.125 0.453 0.75 - 0.17 0.131 0.25 3 030 f
GH2 5.1 5.14 Y87213 4.5P 2.5 0.591 1 - 0.26 0.191 0.312 3 030 f
STI No.10-32UNF
GH3 5.1 5.14 Y87229 4.5P 2.5 0.591 1 - 0.26 0.191 0.312 3 030 f
GH2 6.6 6.68 Y87249 4.5P 2.718 0.669 1.125 - 0.32 0.238 0.375 3 030 f LONG
STI 1/4-28UNF
GH3 6.6 6.68 Y87259 4.5P 2.718 0.669 1.125 - 0.32 0.238 0.375 3 030 f
GH2 8.3 8.31 Y87251 4.5P 2.937 0.748 1.25 - 0.38 0.286 0.437 3 030 f
STI 5/16-24UNF
GH3 8.3 8.31 Y87261 4.5P 2.937 0.748 1.25 - 0.38 0.286 0.437 3 030 f HAND
GH2 9.8 9.89 Y87253 4.5P 3.156 0.866 - - 0.32 0.242 0.406 3 006 f TAPS
STI 3/8-24UNF
GH3 9.8 9.89 Y87263 4.5P 3.156 0.866 - - 0.32 0.242 0.406 3 006 f
GH3 11.5 11.53 Y87265 4.5P 3.375 0.984 - - 0.37 0.275 0.437 3 006 f
STI 7/16-20UNF
GH4 11.5 11.53 Y87275 4.5P 3.375 0.984 - - 0.37 0.275 0.437 3 006 f EG (STI)
STI 1/2-20UNF GH3 13.1 13.12 Y87267 4.5P 3.593 0.984 - - 0.43 0.322 0.5 3 006 f
ANSI
SPECIAL
THREADS,
GAUGES
THREAD
MILLS
DIES
CENTER
DRILLS
Technical
info
The most suitable GH tap class to cut accurate 2B, 3B (UNJ) and 2B oversized internal threads tolerance, depends
on application conditions and work-piece materials. Yamawa GH class system off ers a wide range of alternative
tap classes allowing each customer to select the most suitable one according to application requirement. 537
Check page 673 of Technical info for full details.
