Tap tap- Nanjing Arrow-Stone

Tap tap

Threads are the most common method for connecting mechanical parts, and taps are the most commonly used tools for processing internal threads. The correct selection of taps for processing internal threads can ensure the quality of threaded connections and increase the service life of taps.

Key words:

丝锥丝攻螺旋丝锥直槽丝锥铸铁丝锥

Classification:

Thread processing

Key words:

Tool matrix-Fixture matrix

Consultation:

86-025 84958290

Consulting

Related Products

Product Description

Select the tap tolerance zone

Domestic machine taps are marked with pitch diameter tolerance zone codes: H1, H2, H3 respectively indicate the same position of the tolerance zone, but the tolerance values are different. The tolerance zone code of hand taps is H4. The tolerance value, pitch and angle errors are larger than that of machine taps, and the material, heat treatment , and production process are not as good as machine taps . H4 does not need to be marked according to regulations. The internal thread tolerance zone grades that can be processed by the tap pitch diameter tolerance zone are as follows: The tap tolerance zone code is applicable to the internal thread tolerance zone grade.

H1 4H, 5H

H2 5G, 6H

H3 6G, 7H, 7G

H4 6H, 7H

Some companies use imported taps, and German manufacturers often mark them as ISO1 4H, ISO2 6H, ISO3 6G (the international standard ISO1-3 is the same as the national standard H1-3), so that the tap tolerance code and the machinable internal thread are Tolerance zones are marked.

Select thread format

There are three common common thread systems: metric system , imperial system , and unified system (also called American system). Metric is a thread in millimeters with a tooth profile angle of 60 degrees. For example: M8X1-6H represents a metric fine thread with a diameter of 8 mm, a pitch of 1 mm, and an internal thread tolerance zone of 6H.

The imperial system is a thread with a tooth profile angle of 55 degrees in inches. For example: BSW 1/4-20 means 1/4 inch in diameter, and the coarse thread pitch is 20 teeth per inch. This type of thread is rarely used anymore. Another unified system is a thread with a tooth profile angle of 60 degrees in inches.

Diameters less than 1/4 inch are commonly represented by numbers. No. 0 to No. 12 represent diameter specifications from 0.06 inch to 1/4 inch respectively. The United States still mainly uses unified threads.

Select the type of tap

What we often use are: straight flute taps, spiral flute taps, spiral point taps, and extrusion taps, each with its own merits.

Straight fluted taps are the most versatile, can process through holes or closed holes, non-ferrous metals or ferrous metals, and are also the cheapest. But the pertinence is also poor. Everything can be done, but nothing can be done best. Spiral flute taps are more suitable for processing blind hole threads, and the chips are discharged backward during processing. Due to the helix angle, the actual cutting rake angle of the tap will increase as the helix angle increases.

Experience tells us: when processing ferrous metals, the spiral angle should be smaller, usually around 30 degrees, to ensure the strength of the spiral teeth. When processing non-ferrous metals, the helix angle should be larger, around 45 degrees, for sharper cutting. When threading with a helical point tap, the chips are discharged forward. Extrusion taps are more suitable for processing non-ferrous metals.

Nanjing Jianchuanshi Industry and Trade Co., Ltd. has specialized in cutting tools for more than ten years!
Many agent brands:
Sandvik; Kennametal; YG-1; WALTER; GESAC; YESTOOL; TT ; Zhengheyuan (SYIC) and other
advantageous channels: SCHUNK, HAIMER, Seco, ISCAR, DOMA, Nikken and many European and American products;
In addition: our company undertakes drill bits, drill tips, milling cutter mold modifications, and coatings , non-standard customization and program design. Overall optimization of tooling fixtures and CNC tools. Sales and services of jigs and measuring tools.
Excellent quality! Price guaranteed! Delivery time guaranteed! Welcome to come for consultation.

Follow us