Обший каталог Yamawa 2016 - 2017 - страница 708

Flowchart : M4 tapping
Check 1
PD PD
Boring before tapping


Engagement ratio on cutting taps


Engagement ratio on roll taps
Internal threads
Min
Min 100%
100%
Max 76.3%


Internal threads
M2s


Internal threads
p
Ta


M3s Max
Tap Min
Length of
Length of engagement
Max engagement=6.1mm 76.3%
On "middle" engagement class, 7H class can be chosen
in case of "L" engagement length. Internal threads made by roll taps are
M4s Engagement Internal threads different from those made by cutting
taps on the shape of minor dimameter.
Tap
Symbol


classification
Middle
Coarse


Engagement Unit : mm
Fine


d=4.0mm
length D1 Unit : mm
Engagement External threads
length classification Drill size Min Max *Hole size for thread forming taps
(ref.)
M5s S Short engagement length 4H 5H — S 2(mm) Min Max
Tap 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
Tap

Tolerance area of tap's pitch diameter
M8s Thread class of cutting taps
Tap 【Pitch diameter】
Diameter of imaginary cylinder or cone Internal threads Class PD tolerance
ISO2 29μm〜 48μm
Check 2
Check 2


which makes equal the width of threads
0 and width of space between the threads
M1ps ISO2X 44μm〜 63μm
Ta
ISO2 *Above shows the plus tolerance
ISO2X by setting PD basic size as "0".
2
M1ps
Ta Width of
threads Thread class of roll taps
Width of space Class PD tolerance
7 between threads
-M
M1Taps ISO2X 76μm〜 89μm
Pitch
Threading


diameter ISO3X 89μm〜 102μm
24
ISO2X *Above shows the plus tolerance
-M s by setting PD basic size as "0".
M9 Tap ISO3X
Basic size of pitch diameter
48 3.545mm
5-M s
M2 Tap
-200μm -150μm -100μm -50μm +50μm +100μm +150μm +200μm

ifie
d
ISO2X ISO3X ← Roll taps
Un s 6g
For threadps
Ta Tolerance of dies is the ISO2
target of external threads ← Cutting taps
ISO2X
rth
two
Whi ds Class of dies
For threa s
pTa 6g Solid dies 6g external threads(-112〜-22) 6H internal threads(0〜118)
NR GR GP NP
s
h read
ipe t ps
For P Ta Relative position of PD tolerance area of external threads, internal threads, taps and gages.

ds
hrea
Pg t Taps (–) ← Basic size of pitch diameter →
For (+)
3.545mm
Unit : m Unit : m
Check 3


Ring gage pitch diameter (for external threads inspection) Plug gage pitch diameter (for internal threads inspection)
NR6g -126 〜 -112 GR6g -31 〜 -17 GP6H 2 〜 10 NP6H 118 〜 126
Gage check


NR : NOT GO ring gage GP : GO plug gage
GR : GO ring gage NP : NOT GO plug gage
Unit : mm Unit : mm
Accuracy of external threads Accuracy of internal threads
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


Sizes-7
704 Codes shown in ( ) are available while supplies last.