Обший каталог Yamawa 2016 - 2017 - страница 711

Flowchart : M5 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 76.9%


Internal threads
M2


Internal threads
Ta
ps

M3
Min Max Ta
ps
Length of
Length of engagement
Max engagement=7.6mm 76.9%
74.1%
On "middle" engagement class, 7H class can be chosen
in case of "L" engagement length. Internal threads made by roll taps are
different from those made by cutting
M4
Engagement Internal threads
taps on the shape of minor dimameter. Ta
ps
Symbol


classification
Middle
Coarse


Unit : mm
Engagement
Fine


Unit : mm
d=5.0mm


Engagement
length External threads D1
length classification Drill size Min
*Hole size for thread forming taps
(ref.) Max M5
S Short engagement length 4H 5H — S 2.5(mm) Min Max Ta
M Normal engagement length 5H 6H 7H 2.5 M 7.5(mm)
Bored hole size 4.2 4.134 4.334
4.59 4.67 ps
L Long engagement length 6H 7H 8H 7.5 L(mm)
Engagement ratio 92.4% 100% 76.9% Forming condition changes depending
P=0.8mm 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
M8
Thread class of cutting taps Ta
【Pitch diameter】
ps
Diameter of imaginary cylinder or cone Internal threads Class PD tolerance
ISO2 30μm〜 50μm
Check 2


which makes equal the width of threads
and width of space between the threads M1
ISO2X 50μm〜 70μm Ta 0
ps
*Above shows the plus tolerance
ISO2 by setting PD basic size as "0".
ISO2X M1
Ta 2
Width of ps
threads Thread class of roll taps
Width of space Class PD tolerance
M1
Ta -M7
between threads ISO2X 76μm〜 89μm ps
Pitch
Threading


ISO3X 89μm〜 102μm
diameter
ISO2X *Above shows the plus tolerance
M9
Ta -M2
by setting PD basic size as "0".
ISO3X ps 4

Basic size of pitch diameter
4.480mm M2
Ta 5-M4
-200μm -150μm -100μm -50μm +50μm +100μm +150μm +200μm ps 8
For
ISO2X ISO3X ← Roll taps thr Unifi
6g e e
Ta ads d
p s
Tolerance of dies is the ISO2 ← Cutting taps
target of external threads ISO2X For
W
Class of dies thre hitwo
a r
Ta ds th
6g Solid dies 6g external threads(-119〜-24) 6H internal threads(0〜125) ps
NR GR GP NP
For
P
Ta ipe thre
Relative position of PD tolerance area of external threads, internal threads, taps and gages. ps ads

For
P
Ta g thre
(–) ← Basic size of pitch diameter → (+) ps ad
s
4.480mm
Unit : m Unit : m
Check 3


Ring gage pitch diameter (for external threads inspection) Plug gage pitch diameter (for internal threads inspection)
NR6g -133 〜 -119 GR6g -33 〜 -19 GP6H 2 〜 10 NP6H 125 〜 133
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 4.826〜4.976 4.361〜4.456 − 6H − 4.480〜4.605 4.134〜4.334


Sizes-10
For improvement, spec may change without advance notice. 707