Общий каталог Yamawa 2022 - 2023 - страница 1164

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1. YAMAWA P Class System

YAMAWA P Class system for thread limits is specified in accordance with JTA (The Japan Solid Cutting Tools’ Association). Pitch diameter tolerance zones for normal size M1〜M52 (U,W up to 2") are shown in the table below. Depending on pitch diameter tolerance and tolerance position, pitch diameter tolerance zones are classified into three types, A , B and C. (1) A type : 15μm tolerance. The tolerance of P1, P2, P3… is defined as basic +10〜+25μm, +25〜+40μm, +40〜+55μm and so on, respectively. (2) B type : 20μm tolerance. The tolerance of P1, P2, P3… is defined as basic +0〜+20μm, +20〜+40μm, +40〜+60μm and so on, respectively. (3) C type : 40μm tolerance. The tolerance of P2, P3, P4… is defined as basic +0〜+40μm, +20〜+60μm, +40〜+80μm and so on, respectively. YAMAWA P class system is made in a step form. It can be used to select depending on the tapping conditions.

Pitch Dia. tolerance zone of 5H=100μm : (Tolerance 20μm)

class 3

class 2

class 1

■ Pitch Tolerance zone for P Class with Nominal size and Pitch

Nominal Size1mm≦Size≦24mm24mm＜Size≦30mm30mm＜Size≦52mm
PitchTPI≦7/8in.7/8in≦1 1/4in.1 1/4in.≦2in.
≦0.6mmMore than 40 (TPI)A typeB typeB type
0.6mm＜Pitch≦1.75mm14(TPI)≦40(TPI)B typeB typeB type
12(TPI)・13(TPI)B typeB typeB type
2mm11(TPI)B typeB typeC type
2mm＜Pitch≦5mm5(TPI)≦10(TPI)B typeC typeC type

Internal thread : Tap : Pitch Dia. tolerance zone Pitch Dia. tolerance of 5H Basic Pitch Dia.

Following graph shows :

In metric coarse threads

(2) Pitch diameter tolerance zone of 2nd class (Tap) of JIS Appendix (old JIS) and that of class 2 (Tap) ＜class 1 for M1.4 and smaller＞of the main book of JIS (current JIS). (4) Pitch diameter tolerance zone of standard classes of YAMAWA P class.

P class Pitch

Tolerance=15μm Tolerance=20μm Tolerance=40μm

Basic Pitch Dia. Sizes JIS class 2 HT,SP,PO

class 1 JIS class 2 HT,SP,PO class 1 JIS class 2 HT,SP,PO class 1 JIS class 2 HT,SP,PO class 1

Basic Pitch Dia. Basic Pitch Dia. Basic Pitch Dia. JIS class 2 P class

SP HT,PO class 2 Pitch diameter tolerance zone of recommended class for YAMAWA P class JIS class 2

SP HT,PO

2. JIS Limit class 2

Standard class of YAMAWA Spiral Fluted Tap Thread limits of taps for metric threads : Today the thread limits of ISO2857 are specified in the main book of JIS, and those of old 1st class, 2nd class JIS class 2 HT,SP PO class 2 Standard class of YAMAWA Spiral Pointed Tap and 3rd class are specified in JIS Appendix. In the thread limits of 1st, 2nd and 3rd classes (old JIS), the pitch diameter tolerances change depending on nominal size and pitch even if the class is same. On the other hand, in the thread limit of ISO2857 (current JIS), the pitch diameter tolerance is same HT JIS class 2

and only the tolerance position changes as far as the nominal size is same.SPHT,POStandard class of YAMAWA Spiral Hand Tap
class 2class
The tolerance, as shown in the next picture (Page 669), is specified as X% of internal thread tolerance and it changes depending on nominal diameter
Pitch diameter tolerance zone of tap in the main book of
and pitch. Thread classes of the main book of JIS will be said to be a system located in the middle of YAMAWA P class and old JIS class. To show clearly,JIS class 2JIS (current JIS).
SPHT,PO
thread limit classification is called Class 1, Class 2 and Class 3 in current JIS, and 1st class, 2 nd class and3rd class in old JIS.class 2Class 1 for M1.4 and smaller, class 2 for M1.6 and larger

Technical Inf JIS class 2 Pitch diameter tolerance zone of internal threads in old

SP HT,PO class 2 JIS class 2. JIS class 2 Pitch diameter tolerance zone of internal thread in current SP HT,PO

class 2 JIS (ISO) Class 5H for M1.4 and smaller, class 6H for M1.6 and larger