Общий каталог Yamawa 2022 - 2023 - страница 974

Flowchart : M4 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 76.3%


Internal threads
M2s


Internal threads
p
Ta


M3s
Ta
p
Min Max
Max
Length of
engagement=6.1mm 76.3%
【Length of engagement】
Internal threads made by roll taps are
M4s
On "middle" engagement class, 7H class can be chosen
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
d=4.0mm
Fine


Unit : mm
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≦2（mm） Min Max
Ta
p
M Normal engagement length 5H 6H 7H 2＜M≦6（mm）
Bored hole size 3.3 3.242 3.422
3.65 3.72
L Long engagement length 6H 7H 8H 6＜L（mm）
Engagement ratio 92.4% 100% 76.3% Forming condition changes depending
P=0.7mm 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】
P2 20μｍ〜40μｍ
Diameter of imaginary cylinder or cone Internal threads
P3 40μｍ〜60μｍ
Check 2


which makes equal the width of threads
0 and width of space between the threads
M1ps
Ta
P4 60μｍ〜80μｍ
P2 P5 80μｍ〜100μｍ
P3
2
M1ps
P4 *Above shows the plus tolerance
by setting PD basic size as "0".
Ta Width of P5
threads 【Thread class of roll taps】
Width of space Class PD tolerance
.5 between threads
M8 s
- p
M1 Ta G6 64μｍ〜76μｍ
Pitch
Threading


diameter G6 G7 76μｍ〜89μｍ
24 G7 G8 89μｍ〜102μｍ
-M s
M9 Tap G8 *Above shows the plus tolerance
by setting PD basic size as "0".
Basic size of pitch diameter
48 -200μm -150μm -100μm -50μm 3.545mm +50μm +100μm +150μm +200μm
5-M ps
M2 Ta
Ⅱ G6 G7 G8
100
0-M s
P1 P2 P3 P4 P5
M5 Tap Tolerance of dies is the P2
target of external threads
nifi
ed
Class of dies 6g external threads(-112〜-22) 6H internal threads(0〜118)
r U ads
Fo r e s
NR GR GP NP
t h
Ta
p
Ⅱ Solid dies
P1 Solid dies JIS 2Class external threds(-112〜-22) JIS 2Class intenal threads(0〜118)
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 ）
e w
on s s（S
p
M
(–) ← Basic size of pitch diameter → (+)
Ta
3.545mm
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 -126 〜-112 GR6g -31 〜-17 GP6H 2 〜 10 NP6H 118 〜 126
can
eri WRⅡ -112 〜-104 GRⅡ -34 〜-26 GPⅡ 4 〜 12 WPⅡ 110 〜 118
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 3.838〜3.978 3.433〜3.523 − 6H − 3.545〜3.663 3.242〜3.422
JIS 2class 3.838〜3.978 3.433〜3.523 〜3.119 JIS 2class − 3.545〜3.663 3.242〜3.422


Sizes-10