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Guide to Thread Forming Taps (Roll Taps)

5. アメリカ向けタップの等級・やまわP級とユニファイめねじ等級の有効径公差域比較表 Thread Forming Taps are the tools used for producing internal threads by a thread forming process. Currently, YAMAWA's Thread Forming Taps have a good reputation by being used in large area. They are widely used along with the diversity of workpieces and with the change into miniaturization of workpieces. Followings are the characteristics and features of Thread Forming Taps (Roll Tap) which

等級P1P3P5
cutting type taps do not have.
呼びP2P4P6
めねじ有効径公差<Features of Roll Taps>

210 220 230 240

3B2B○Tapping without producing chips. They are suitable for blind hole tapping. In producing internal threads with no chips, they save you a
P1time for chip disposal.
№2-56UNC53 70○Roll taps are stronger than cutting taps due to their design. The effect of fluteless design gives a large cross-section area to the tap,
GH2P級 標準等級and there is no worry of chip jamming, which makes Roll taps very tough against breakage.
P級 オーバーサイズ○Roll taps produce excellent pitch diameter well within pitch diameter tolerances.
P1Material deformation process produces the
№3-48UNCANSI 標準等級55 75internal threads with good surface finish as well as precise pitch diameter.
GH2ANSI オーバーサイズ
○High efficiency and tool life The configuration of the lobes at the crests of the tap threads makes high speed tapping possible and extends
P1P3 P2 めねじ３Ｂtool life compared with cutting type taps. The addition of a supplemental tap surface treatment, such as Oxidizing, Nitriding, TiN, and TiCN can
№4-40UNC60 83extend tool life 2 to 20 times over an uncoated (bright) tap performance.
GH2 GH3 GH4 GH5めねじ2Ｂ
P1<Points to note during a Roll tapping operation>
№5-40UNC63 83
GH2○Tapping torque is 2 to 3 times larger than that of cutting type taps.
○Roll tapping is only applicable to stringy materials.
○The deviation of hole size before tapping should be about 5% of pitch. The control of hole size before tapping should be more severe than that of
cutting type taps.
等級P6 P4 P2○The selection of lubricants is important to prevent sticking or welding.
呼びP7 P5 P3○Burrs at the face of an internal thread are larger than those produced by cutting type taps. In some cases it is necessary to take additional counter-
sink processing at the top of hole.
めねじ有効径公差

210 220 230 240 ○In the minor diameter of internal thread, U-shape form (Tine form) at the hole entrance can be seen. U-shape form is never seen when using cutting

3B 2B type taps.

P2 P3 P4 <Selection of YAMAWA Roll Taps>

№6-32 UNC6893
GH2 GH3 GH4 GH5 GH6 GH7○Types of Roll Taps YAMAWA produces various types of Roll Taps which include General purpose taps, Special purpose taps for non-ferrous and

P2 P3 P4 steel, as well as special purpose taps with surface treatment for the specified applications. To provide for longer tool life, specially developed

№8-32 UNC71 96premium materials are also used together with physical vapor deposition (PVD) such as TiN and TiCN. In particular, OL-RZ is superior product
GH2 GH3 GH4 GH5 GH6 GH7developed for dry machining with good regards to tapping environment and performance.

P2 P3 P4 ○Tap Materials YAMAWA's standard tap material is SKH58 designed for improving torque, superior anti-friction properties as well as toughness.

№10-24 UNC 80 108 To extend tool life, we use SKH56, or SKH10(Powder HSS) which is the best tap material for antifriction.

GH3GH5 GH6 GH7○Tolerance Class Using the datum 12.7μm in a step form, in accordance with ANSI standard GH class, we made up YAMAWA's G class system.
P2The differences in materials being Roll tapped, as well as hole size, contribute to differences in thread forming. YAMAWA offers 2 to 3 oversized tap
№12-24 UNC82 110tolerance classes in order to achieve the most suitable internal thread pitch diameter size.
GH3○Chamfer length
Chamfer lengths : 2 pitches for blind hole use and 4 pitches for through hole use. Basically 4 pitches have longer tool life than

P2 P3 P4 2 pitches because force applied on one blade at 4 pitch chamfer is smaller than that at 2 pitch chamfer. However, it is difficult to say about tool life

1/4-20 UNC90 123in a few words because each different tapping condition influences the tool life.
GH3GH5 GH6 GH7

P2 P3 P4 <Shape of internal threads and the ratio of thread engagement affected by bored hole diameter>

5/16-18 UNC 98 134 Compared with the basic height of thread engagement, the actual height of the thread engagement is called "thread engagement ratio" in percentage.

GH3GH5GH7
Depending on the bored hole diameter, internal threads and thread engagement ratio will change.

P2 P3 P4

3/8-16 UNC 108 144 In tapping, the tapping condition must be chosen by referring to the thread engagement ratio.

GH3GH5GH7
In tapping, it can reduce cutting space and forming space to make bored hole diameters as large as possible. This, through reducing the load on taps,

P2 P3 can restrict tap's wear and damage.

7/16-14 UNC116 154
GH3GH5

P2 P3 P4 S50C, minor diameter of threads cut Aluminum, minor diameter of threads formed

1/2-13 UNC 121 165

GH3 GH5 GH7 M24x3 M25x2

P2 minor dia. tolerance of internal threads minor dia. tolerance of internal threads

9/16-12 UNC128 172φ20.752~φ21.252φ22.835~φ23.210
GH3

P3 P4 Internal External 【Aluminum, internal threads formed ①】 Internal External

5/8-11 UNC 136 182 【S50C internal threads cut ①】

GH3GH5threadsthreadsM25x2threadsthread
M24x3
P3P4bored hole size : φ23.903side
bored hole size : φ20.652

3/4-10 UNC 144 195 minor diameter of finished internal threads : 22.723mm

GH3GH5minor dia. tolerance of internal threads NG
minor dia. tolerance of internal threads NG
thread engagement ratio : 103.1%
P3thread engagement ratio : 105.2%

7/8-9 UNC 154 207

GH4 【Aluminum, internal threads formed ③】 【S50C internal threads cut ③】 M25x2 M24x3

bored hole size : φ24.042mm bored hole size : φ21.000 minor diameter of finished internal threads : 23.067mm minor dia. tolerance of internal threads: Middle

等級P2P4P6P8minor dia. tolerance of internal threads : Middle
thread engagement ratio : 92.4%
thread engagement ratio : 89.3%
呼びP3P5P7
【Aluminum, internal threads formed ⑤】Technical Inf
めねじ有効径公差【S50C internal threads cut ⑤】

210 220 230 240 M25x2

3B2BM24x3
bored hole size : φ24.240mm
bored hole size : φ21.352
P4minor diameter of finished internal threads : 23.462mm

1-8 UNC 167 223 minor dia. tolerance of internal threads NG

GH4 minor dia. tolerance of internal threads NG thread engagement ratio : 81.5% thread engagement ratio : 71.0%