戻る
The tapered plug gauge that measures the internal thread of the Rc is indicated by an "R".
It is stipulated in "JIS B 0253 10 Indication" that "all symbols representing screws may be R".
Reference: Difference between the notch between the conventional JIS and the current JIS of the tapered plug gauge
| internal thread Shape | Conventional JIS | Current JIS |
| Taper internal thread |
PT (1) Acceptance range (2) Taper internal thread PT (3) PT plug gauge (1 notch level) (4) Pipe end |
Rc (5) Acceptance range (6) Taper internal thread RC (7) R plug gauge (2 notches) gauge becomes R! (8) Pipe end |
| Parallel internal thread |
PS (9) Pipe end (10) Parallel internal thread PS (11) PT plug gauge (1 notch level) gauge is a PT! |
Rp (12) Pipe end (13) Parallel internal thread Rp (14) R plug gauge (2 notches) gauge becomes R! |
(FAQID:248)