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h stock standard, ) check stock EU, f check stock JP, m stock exhaustion

TCTR Bored Hole Ø (mm) Code THCHT LF THL LU LS DCON K LK NOF Type Stock Intro
UNC (tolerance) Max Min (chamfer) (inch) (inch) (inch) (inch) (inch) (inch) (inch) (Lobes)
ANSI
H3 1.99 1.97 386801M 2P 1.772 0.314 - 1.161 0.141 0.11 0.187 0(4) 004 f
No.2-56UNC
H3 2.3 2.27 386802M 2P 2.205 0.354 0.669 1.28 0.141 0.11 0.187 0(4) 005 f SP
No.3-48UNC
H3 2.58 2.55 386804M 2P 2.205 0.354 0.709 1.28 0.141 0.11 0.187 0(4) 005 f
No.4-40UNC
H5 2.61 2.57 386805M 2P 2.205 0.354 0.709 1.28 0.141 0.11 0.187 0(4) 005 f
H5 2.94 2.9 386799M 2P 2.205 0.433 0.768 1.358 0.141 0.11 0.187 2(4) 005 f
No.5-40UNC
SL
H3 3.17 3.13 386810M 4P 2.205 0.433 0.787 1.358 0.141 0.11 0.187 2(4) 005 f
H3 3.17 3.13 386808M 2P 2.205 0.433 0.787 1.358 0.141 0.11 0.187 2(4) 005 f
No.6-32UNC
H5 3.19 3.15 386811M 4P 2.205 0.433 0.787 1.358 0.141 0.11 0.187 2(4) 005 f
H5 3.19 3.15 386809M 2P 2.205 0.433 0.787 1.358 0.141 0.11 0.187 2(4) 005 )
PO
H3 3.83 3.79 386814M 4P 2.48 0.512 0.827 1.535 0.168 0.131 0.25 2(4) 005 f
H3 3.83 3.79 386812M 2P 2.48 0.512 0.827 1.535 0.168 0.131 0.25 2(4) 005 f
No.8-32UNC
H5 3.85 3.81 386815M 4P 2.48 0.512 0.827 1.535 0.168 0.131 0.25 2(4) 005 f
H5 3.85 3.81 386813M 2P 2.48 0.512 0.827 1.535 0.168 0.131 0.25 2(4) 005 ) ST
H4 4.99 4.33 386818M 4P 2.756 0.551 0.984 1.654 0.194 0.152 0.25 2(4) 005 f
H4 4.99 4.33 386816M 2P 2.756 0.551 0.984 1.654 0.194 0.152 0.25 2(4) 005 f
H6 4.41 4.35 386819M 4P 2.756 0.551 0.984 1.654 0.194 0.152 0.25 2(4) 005 f
No.10-24UNC
ROLL
H6 4.41 4.35 386817M 2P 2.756 0.551 0.984 1.654 0.194 0.152 0.25 2(4) 005 )
H4 5.83 5.76 386826M 4P 3.15 0.591 1.181 1.713 0.255 0.191 0.312 2(4) 005 f ANSI
H4 5.83 5.76 386824M 2P 3.15 0.591 1.181 1.713 0.255 0.191 0.312 2(4) 005 f
1/4-20UNC
H6 5.85 5.78 386827M 4P 3.15 0.591 1.181 1.713 0.255 0.191 0.312 2(4) 005 f CARBIDE
H6 5.85 5.78 386825M 2P 3.15 0.591 1.181 1.713 0.255 0.191 0.312 2(4) 005 )
H5 7.36 7.28 386834M 4P 3.543 0.748 1.378 1.831 0.318 0.238 0.375 3(6) 006 f
H5 7.36 7.28 386832M 2P 3.543 0.748 1.378 1.831 0.318 0.238 0.375 3(6) 006 f
LONG
5/16-18UNC
H7 7.38 7.31 386835M 4P 3.543 0.748 1.378 1.831 0.318 0.238 0.375 3(6) 006 f
H7 7.38 7.31 386833M 2P 3.543 0.748 1.378 1.831 0.318 0.238 0.375 3(6) 006 )
H5 8.86 8.78 386842M 4P 3.937 0.906 1.535 2.028 0.381 0.286 0.437 3(6) 006 f
H5 8.86 8.78 386840M 2P 3.937 0.906 1.535 2.028 0.381 0.286 0.437 3(6) 006 f HAND
3/8-16UNC TAPS
H7 8.89 8.8 386843M 4P 3.937 0.906 1.535 2.028 0.381 0.286 0.437 3(6) 006 f
H7 8.89 8.8 386841M 2P 3.937 0.906 1.535 2.028 0.381 0.286 0.437 3(6) 006 )
H5 10.35 10.26 386850M 4P 3.937 0.906 - 2.008 0.323 0.242 0.406 4(8) 007 f
H5 10.35 10.26 386848M 2P 3.937 0.906 - 2.008 0.323 0.242 0.406 4(8) 007 f EG (STI)
7/16-14UNC
H7 10.38 10.28 386851M 4P 3.937 0.906 - 2.008 0.323 0.242 0.406 4(8) 007 f
H7 10.38 10.28 386849M 2P 3.937 0.906 - 2.008 0.323 0.242 0.406 4(8) 007 f
H5 11.88 11.77 386858M 4P 4.331 1.024 - 2.205 0.367 0.275 0.437 4(8) 007 f SPECIAL
THREADS,
H5 11.88 11.77 386856M 2P 4.331 1.024 - 2.205 0.367 0.275 0.437 4(8) 007 f
GAUGES
1/2-13UNC
H7 11.9 11.8 386859M 4P 4.331 1.024 - 2.205 0.367 0.275 0.437 4(8) 007 f
H7 11.9 11.8 386857M 2P 4.331 1.024 - 2.205 0.367 0.275 0.437 4(8) 007 f
THREAD
TCTR Bored Hole Ø (mm) THCHT LF THL LU LS DCON K LK NOF
(tolerance) Max Min (chamfer) (inch) (inch) (inch) (inch) (inch) (inch) (inch) (Lobes)
UNF Code Type Stock MILLS
ANSI
H2 1.39 1.37 386800M 2P 1.772 0.236 - 1.161 0.141 0.11 0.187 0(3) 004 f
No.0-80UNF
H3 2.32 2.3 386803M 2P 2.205 0.354 0.669 1.28 0.141 0.11 0.187 0(4) 005 f DIES
No.3-56UNF
H3 2.62 2.6 386806M 2P 2.205 0.354 0.709 1.28 0.141 0.11 0.187 0(4) 005 f
No.4-48UNF
H5 2.65 2.62 386807M 2P 2.205 0.354 0.709 1.28 0.141 0.11 0.187 0(4) 005 f
H4 4.5 4.46 386822M 4P 2.756 0.551 0.984 1.654 0.194 0.152 0.25 2(4) 005 f CENTER
H4 4.5 4.46 386820M 2P 2.756 0.551 0.984 1.654 0.194 0.152 0.25 2(4) 005 f DRILLS
No.10-32UNF
H6 4.53 4.48 386823M 4P 2.756 0.551 0.984 1.654 0.194 0.152 0.25 2(4) 005 f
H6 4.53 4.48 386821M 2P 2.756 0.551 0.984 1.654 0.194 0.152 0.25 2(4) 005 )
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 offers a wide range of alternative
tap classes allowing each customer to select the most suitable one according to application requirement. 381
Check page 673 of Technical info for full details.