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How to choose appropriate tap
From;    Author:Stand originally

[keyword] tap

[paper summary] whorl is the method with the commonnest join of mechanical spare parts, and tap is the tool with the most commonly used whorl inside treatment. Choose the whorl inside tap treatment correctly, can assure the quality of threaded coupling, improve the service life of tap.

Whorl is the method with the commonnest join of mechanical spare parts, and tap is the tool with the most commonly used whorl inside treatment. Choose the whorl inside tap treatment correctly, can assure the quality of threaded coupling, improve the service life of tap.

Choose area of tap public errand

Homebred machine with tap public errand of the diameter in indicating bears code name: H1, H2, H3 states tolerancepublic errand takes different place respectively, but tolerancepublic errand value is equal. The hand takes code name to be H4 with the public errand of tap, tolerancepublic errand value, pitch reachs angle error comparing machine uses tap big, technology of qualitative, heat treatment, production also is inferior to material machine with tap. H4 need not indicate by the regulation. Belt of public errand of the diameter in tap can machine inside whorl public errand takes grade to be as follows:

Tap public errand bears code name applicable inside whorl public errand takes order and degree
H1 4H, 5H
H2 5G, 6H
H3 6G, 7H, 7G
H4 6H, 7H

Some enterprises use entrance tap, constant mark is German manufacturer ISO1 4H, ISO2 6H, ISO3 6G (international standard ISO1-3 and national level H1-3 are be equal) , take tap noncombatant duty so code name reachs what can machine inside whorl public errand is taken on mark.

Choose whorl make type

At present common common thread has 3 kinds to make type: Metric, imperial, unified make (also say US-made) . Metric be it is an unit with millimeter, tooth form horn 60 degrees whorl. For example: M8X1-6H expresses a diameter of 8 millimeter metric fine tooth whorl, pitch 1 millimeter, of 6H inside belt of whorl public errand.

Imperial be with inch for the unit, tooth form horn 55 degrees whorl. For example: BSW 1/4-20 expresses diametical 1/4 inch, thick tooth pitch every inches of 20 teeth, this kind of whorl already was used rarely at present. Additional unified making is with inch for the unit, tooth form horn 60 degrees whorl. The diameter is less than 1/4 inch,

Commonly used number shows, state to 12 by 0 0.06 inches come respectively 1/4 inch diametical norms. What the United States basically uses at present still is unified make thread.

Choose the sort of tap

What we often use is: Straight chamfer tap, helix chamfer tap, snail pointed tap, extruding tap, its function each has his strong point.

Graph 1, tap of chamfer of straight chamfer, needle of extruding, snail, helix
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