Обший каталог Yamawa 2016 - 2017 - страница 711

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PD PD

MinMin

MinMin 100%

100%100%

MaxMax 76.9%

M2 Taps M3

MaxMax

Min Taps

MaxLength of74.1%76.9%
Length of engagementengagement=7.6mm
On "middle" engagement class, 7H class can be chosenM4
in case of "L" engagement length.Internal threads made by roll taps are
Engagementdifferent from those made by cutting
Internal threadstaps on the shape of minor dimameter.Taps
classificationUnit : mm
Engagement

length D1 Unit : mm

Engagement External threads *Hole size for thread forming taps

length classificationDrill sizeMinMaxM5
(ref.)

S Short engagement length 4H 5H — S 2.5(mm) Min Max

Bored hole size 4.2 4.134 4.334 Taps

M Normal engagement length 5H 6H 7H 2.5 M 7.5(mm) 4.59 4.67

Engagement ratio92.4%100%76.9%
Forming condition changes depending

L Long engagement length 6H 7H 8H 7.5 L(mm)

P=0.8mm on workpiece's Material and shape. 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 Taps 【Pitch diameter】

Diameter of imaginary cylinder or coneInternal threadsClassPD tolerance
which makes equal the width of threadsISO230μm〜 50μmM10
and width of space between the threads
ISO2X50μm〜 70μmTaps

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 toleranceM1-M
between threadsbetween threadsISO2X76μm〜 89μm7
Taps
Pitch Pitchμ〜μ
ISO3X89m 102m
diameterdiameter
ISO2XISO2X*Above shows the plus toleranceM9-M
ISO3XISO3Xby setting PD basic size as "0".24
Taps
Basic size of pitch diameter
4.480mmM25-M
-200μm-150μm-100μm-50μm+50μm+100μm+150μm+200μmTaps48
←For Unified
6gISO2X ISO3XRoll tapsthreads
Taps
Tolerance of dies is theISO2←
Cutting taps
target of external threadsISO2XFor Whitworth
Class of diesthreads
6gSolid dies6g external threads(〜〜Taps
-119-24)6H internal threads(0125)

NR GR GP NP

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

For Pg threads (–) ← Basic size of pitch diameter → (+) Taps

4.480mm

Unit : m Unit : m

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

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