Общий каталог Yamawa 2022 - 2023 - страница 970

Flowchart : M3 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
M2s


Internal threads
p
Ta


M3s
Ta
p
Min Max
Max
Length of
engagement=4.6mm 74.1%
【Length of engagement】
On "middle" engagement class, 7H class can be chosen Internal threads made by roll taps are
M4s in case of "L" engagement length. different from those made by cutting
p Internal threads
Ta Engagement Unit : mm
taps on the shape of minor dimameter.
Symbol


Middle
Coarse


classification Engagement
D1 Unit : mm
Fine


d=3mm
Engagement length External threads
length classification Drill size Min Max
*Hole size for thread forming taps
M5s
(ref.)
S Short engagement length 4H 5H − S≦1.5（mm） Min Max
Ta
p
M Normal engagement length 5H 6H 7H 1.5＜M≦4.5（mm）
Bored hole size 2.5 2.459 2.599
2.75 2.82
L Long engagement length 6H 7H 8H 4.5＜L（mm）
Engagement ratio 92.4% 100% 74.1% Forming condition changes depending
P=0.5mm D1 is minor diameter of JIS 6H(2nd Class) of internal threads on workpiece's Material and shape.
Above is for customer's reference.
M6s
p
Ta

Tolerance area of tap's pitch diameter 【Thread class of cutting taps】
M8s Class PD tolerance
T ap
【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
0 and width of space between the threads
M1ps
Ta
P3 40μｍ〜 55μｍ
P1 P4 55μｍ〜 70μｍ
P2
2
M1ps
P3 *Above shows the plus tolerance
by setting PD basic size as "0".
Ta Width of P4
threads 【Thread class of roll taps】
Width of space
Class PD tolerance
8.5 between threads
-M ps
M1 Ta G5 51μｍ〜 64μｍ
Pitch
Threading


diameter G5 G6 64μｍ〜 76μｍ
24
G6 G7 76μｍ〜 89μｍ
-M s
M9 Tap G7
*Above shows the plus tolerance
by setting PD basic size as "0".
Basic size of pitch diameter
48 -150μm -100μm -50μm 2.675mm +50μm +100μm +150μm
5-M ps
M2 Ta
Ⅱ G5 G6 G7
100
0-M s
P1 P1 P2 P3 P4
M5 Tap Tolerance of dies is the P2
target of external threads
nifi
ed
Class of dies 6g external threads(-95〜-20) 6H internal threads(0〜100)
r U ads
Fo r e s
NR GR GP NP
t h
Ta
p
Ⅱ Solid dies
P1 Solid dies JIS 2Class external threads(-95〜-20) JIS 2Class intenal threads(0〜100)
h
ort
itw
Wh ds P2 for Auto Lathe WR GR GP WP
For threa s
p
Ta Relative position of PD tolerance area of external threads, internal threads, taps and gages.
ed
ds us
threa es
crew hin
For S ing mac ）
w
e
on s s（S
p
M
(–) ← Basic size of pitch diameter → (+)
Ta
2.675mm
ds
rea
Unit : μm Unit : μm
e th ps
Pip Ring gage pitch diameter (for external threads inspection) Plug gage pitch diameter (for internal threads inspection)
For Ta
Check 3


NR6g -105 〜 -95 GR6g -23 〜 -13 GP6H 2 〜 10 NP6H 100 〜 108
can
eri WRⅡ -95 〜 -87 GRⅡ -32 〜 -24 GPⅡ 4 〜 12 WPⅡ 92 〜 100
Gage check


Am ds
For threa s
e
pip Ta
p NR : NOT GO ring gage GR : GO ring gage GP : GO plug gage NP : NOT GO plug gage
WR : NOT GO working ring gage WP : NOT GO working plug gage
ure
iat
Unit : mm Unit : mm
Min ds
For threa s
p
Accuracy of external threads Accuracy of internal threads
Ta
Major diameter Pitch diameter Minor diameter Major diameter Pitch diameter Minor diameter
6g 2.874〜2.980 2.580〜2.655 − 6H − 2.675〜2.775 2.459〜2.599
JIS 2class 2.874〜2.980 2.580〜2.655 〜2.367 JIS 2class − 2.675〜2.775 2.459〜2.599


Sizes-6