A reverse-buttress internal thread or an internal thread having an included angle of 90 degrees is used as an internal thread of the screw-joined portion.
The tap (10) is fluteless and comprises a threaded portion (23) with a triangular form thread (11) with an angle of thread (gamma) in the range 29°-40° and radiussed crests (16).
The internal thread having an included angle of 90 degrees is formed in such a way that inclination angles (α), (Ϝ) of both flanks are equal and the included angle (δ) is about 90 degrees.
The inner thread and the outer thread have a thread angle between 5° and 25°.
First and second cylinder bores (502, 504) can be inclined to each other at an included angle (a).
The shank has a first threaded portion (28) having a predetermined thread angle and a predetermined hardness, and a second threaded portion (30) extends from the first threaded portion.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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