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PD PD )

MinMin

MinMin 100%

100%100%

MaxMax 81.5%

M2 Taps

M3 MaxMax Min

Taps Length of 74.1%81.5%

Max Length of engagement engagement=15.1mm On "middle" engagement class, 7H class can be chosen in case of "L" engagement length. Internal threads made by roll taps are

M4 Engagement different from those made by cutting

Internal threads taps on the shape of minor dimameter.

Taps classification Unit : mm

Engagement Unit : mm length D1

Engagement External threads *Hole size for thread forming taps

length classification Drill size Min

Max

(ref.) Min Max

M5 S Short engagement length 4H 5H — S 5(mm)

Bored hole size 8.5 8.376 8.676

9.22 9.34

Taps M Normal engagement length 5H 6H 7H 5 M 15(mm)

Engagement ratio 92.4% 100% 81.5%

Forming condition changes depending

L Long engagement length 6H 7H 8H 15 L(mm) on workpiece's Material and shape.

P=1.5mm 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 Class

Diameter of imaginary cylinder or coneInternal threadsInternal threadsPD tolerance
which makes equal the width of threadsISO242μm〜70μm

and width of space between the threads

M10 ISO2X 67μm〜95μm

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

Width of space Width of spaceClassPD tolerance
M7between threadsbetween threadsμ〜μ
M1-ISO2X 114m127m

Taps Pitch Pitch ISO3X 140μm〜152μm diameterdiameter

ISO2XISO2X

*Above shows the plus tolerance

M24 ISO3XISO3X by setting PD basic size as "0".

M9- Taps Basic size of pitch diameter 9.026mm

-M48 -200μm -150μm -100μm -50μm +50μm +100μm +150μm +200μm

M25 Taps

ISO2X ISO3X ← Roll taps

6g

For Unifiedthreads Tolerance of dies is the ISO2 Taps ← Cutting taps target of external threads ISO2X Class of dies

For Whitworththreads6gSolid dies〜〜
6g external threads(-164-32)6H internal threads(0180)

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 9.026mm

Unit : m Unit : m Ring gage pitch diameter(for external threads inspection) Plug gage pitch diameter(for internal threads inspection)

NR6g -182 〜 -164 GR6g -49 〜 -31 GP6H 7 〜 17 NP6H 180 〜 190

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 〜 〜 − 6H − 9.026〜9.206 8.376〜8.676