Общий каталог Yamawa 2022 - 2023 - страница 967

Flowchart : M2 tapping
PD PD
Boring before tapping


Engagement ratio on cutting taps
Check 1


Engagement ratio on roll taps
Min


Internal threads
Min 100%
100%
Max 74.1%


Internal threads
M2


Internal threads
Ta
ps


M3
Min Max Ta
ps
Max Length of
engagement=3.1mm 74.1%
【Length of engagement】
On "middle" engagement class, 7H class can be chosen Internal threads made by roll taps are M4
in case of "L" engagement length. different from those made by cutting Ta
Internal threads ps
Engagement taps on the shape of minor dimameter.
Unit : mm
Symbol


Middle


classification
Coarse


Engagement
D1 Unit : mm
Fine


d=2.0mm


Engagement length External threads
Drill size Min
*Hole size for thread forming taps
length classification
(ref.) Max M5
S Short engagement length 4H 5H − S≦1（mm） Min Max Ta
M Normal engagement length 5H 6H 7H 1＜M≦3（mm）
Bored hole size 1.6 1.567 1.679
1.79 1.84
ps

L Long engagement length 6H 7H 8H 3＜L（mm）
Engagement ratio 92.4% 100% 74.1% Forming condition changes depending
P=0.4mm D1 is minor diameter of JIS 6H(2nd Class) of internal threads on workpiece's Material and shape.
Above is for customer's reference. M6
Ta
ps

Tolerance area of tap's pitch diameter 【Thread class of cutting taps】 M8
Class PD tolerance Ta
ps
【Pitch diameter】
P1 10μｍ〜 25μｍ
Diameter of imaginary cylinder or cone Internal threads
P2 25μｍ〜 40μｍ
Check 2


which makes equal the width of threads
and width of space between the threads M1
Ta 0
P3 40μｍ〜 55μｍ ps
P1 P4 55μｍ〜 70μｍ
P2
P3 *Above shows the plus tolerance
by setting PD basic size as "0".
M1
Ta 2
Width of P4 ps
threads 【Thread class of roll taps】
Width of space
width
Class PD tolerance M1
between threads Ta -M
8.5
G4 38μｍ〜 51μｍ ps
Pitch
Threading


diameter G4 G5 51μｍ〜 64μｍ
G5 G6 64μｍ〜 76μｍ M9
-M
G6
Ta
ps 24
*Above shows the plus tolerance
by setting PD basic size as "0".
Basic size of pitch diameter
-150μm -100μm -50μm 1.740mm +50μm +100μm +150μm
M2
Ta 5-M
ps 48

Ⅱ G4 G5 G6
M5
P1 P1 P2 P3 P4 Ta 0-M1
ps 00
Tolerance of dies is the P2
target of external threads
Fo
Class of dies 6g external threads(-86〜-19) 6H internal threads(0〜90) rU
thr nifie
e
Ta ads d
NR GR GP NP
Ⅱ Solid dies ps

P1 Solid dies JIS 2Class external threads(-80〜-20) JIS 2Class intenal threads(0〜70) For
P2 for Auto Lathe WR GR GP WP e
W
thr hitwo
r
Ta ads th
ps
Relative position of PD tolerance area of external threads, internal threads, taps and gages.
For S
crew
on se threads
w us
Ta ing machi ed
ps（ nes
(–) ← Basic size of pitch diameter → (+) M）S
1.740mm
For
Unit : μm Unit : μm P
Ta ipe th
ps read
Ring gage pitch diameter (for external threads inspection) Plug gage pitch diameter (for internal threads inspection) s
Check 3


NR6g -96 〜 -86 GR6g -22 〜 -12 GP6H 2 〜 10 NP6H 90 〜 98
For
A
WRⅡ -80 〜 -72 GRⅡ -32 〜 -24 GPⅡ 4 〜 12 WPⅡ 62 〜 70 pip meric
Gage check


e a
Ta thre n
NR : NOT GO ring gage GR : GO ring gage GP : GO plug gage NP : NOT GO plug gage ps ads
WR : NOT GO working ring gage WP : NOT GO working plug gage
For
Unit : mm Unit : mm M
thr iniatu
e
Accuracy of external threads Accuracy of internal threads Ta ads re
ps
Major diameter Pitch diameter Minor diameter Major diameter Pitch diameter Minor diameter
6g 1.886〜1.981 1.654〜1.721 − 6H − 1.740〜1.830 1.567〜1.679
JIS 2class 1.890〜1.980 1.660〜1.720 〜1.490 JIS 2class − 1.740〜1.810 1.567〜1.679


Sizes-3