Обший каталог Yamawa 2016 - 2017 - страница 718

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Flowchart : M8 tappingM 8 加工フロー

PD PD )

MinMinMinMin MinMinMinMin 100%100% 100%100%100%100% MaxMaxMaxMax 80.4%80.4%

M2 Taps

M3 MaxMaxMaxMax MinMin

Taps Length of 74.1%80.4%74.1%80.4%

MaxMax Length of engagement engagement=12.1mm On "middle" engagement class, 7H class can be chosen in case of "L" engagement length. Internal threads made by roll taps are

M4 different from those made by cutting Engagement Internal threads classification taps on the shape of minor dimameter.

TapsEngagementUnit : mm
D1Unit : mm
length

Engagement External threads *Hole size for thread forming taps

length classification Drill size Min Max

M5 (ref.) Min Max

S Short engagement length 4H 5H — S 4(mm)

Bored hole size 6.8 6.647 6.912 7.36 7.49

Taps M Normal engagement length 5H 6H 7H 4 M 12(mm)

Engagement ratio88.7%100%80.4%
Forming condition changes depending

L Long engagement length 6H 7H 8H 12 L(mm) on workpiece's Material and shape.

P=1.25mm D1 is minor diameter of JIS 6H(2nd Class) of internal threads Above is for customer's reference. M6 Taps

Tolerance area of tap's pitch diameter

M8 Thread class of cutting taps 【Pitch diameter】 Taps

internal threadsInternal threadsClassPD tolerance
Diameter of imaginary cylinder or cone
which makes equal the width of threadsISO238μm〜63μm
and width of space between the threads
M10ISO2X63μm〜88μm

Taps ISO2ISO2 *Above shows the plus tolerance by setting PD basic size as "0". ISO2XISO2X

M12 Width of Width of Taps threadsthreads Thread class of roll taps

PD tolerance Width of space Width of space Class
M7μ 〜 μ between threadsbetween threads
M1-m 114 m ISO2X 102
TapsPitch Pitch
ISO3X 114μm〜127μm
diameterdiameter
ISO2XISO2X *Above shows the plus tolerance
M24ISO3XISO3X by setting PD basic size as "0".
M9-
Taps
Basic size of pitch diameter
7.188mm

-M48 -200-200μμm -150-150μμm -100-100μμm -50-50μμm +50+50μμm +100+100μμm +150+150μμm +200+200μμm

M25 Taps ISO2X ISO3X ← Roll taps 6g

For Unifiedthreads

TapsTolerance of dies is theISO2←
target of external threadsCutting taps
ISO2X
Class of dies
For Whitworththreads6gSolid dies〜〜
6g external threads(-146-28)6H internal threads(0160)
Taps

NRNR GRGR GPGP NPNP

For Pipe threads Relative position of PD tolerance area of external threads, internal threads, taps and gages. Taps

(–)←Basic size of pitch diameter→(+)
For Pg threadsTaps
7.188mm
Unit : mUnit : m
Ring gage pitch diameter (for external threads inspection)Plug gage pitch diameter (for internal threads inspection)

NR6g -160 〜 -146 GR6g -37 〜 -23 GP6H 7 〜 17 NP6H 160 〜 170

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 7.760〜7.972 7.042〜7.160 − 6H − 7.188〜7.348 6.647〜6.912