
| Tappi Pro | ng conditions duct symbol | LS-INT-PT | LS-INT-S- PT | FC-PT | FC-S-PT | CT-PT | CT-S-PT | NPT | S-NPT | SP-NPT |
| Ta Surfa | p material ce treatment | HSS OX | HSS OX | HSS NI | HSS NI | HF | HF | HSS | HSS | HSS |
| Name | For taper pipe For stainl interr | threads, long ess steel, upted | For ta | per pipe thre | ads; For ca | st iron | For Ameri F | can taper pip or general us | e threads; e | |
| Bored For M For Ui | Hole Shape etric Threads nified Threads | |||||||||
| For Whi | tworth Threads | |||||||||
| For Screw Threads Pip | used on Sewing Machines e Threads | ⑧-28 | ⑧-29 | ⑧-36 | ⑧-37 | ⑧-38 | ⑧-39 | |||
| America | n Pipe Threads | ⑧-80 | ⑧-84 | ⑧-86 | ||||||
| For Min | iature Threads | |||||||||
| For Trap | ezoidal Threads | |||||||||
| ~S25C | Low carbon steels | ◆ ○ | ◆ ○ | ◆ ◎ | ||||||
| S25C~S45C | Medium carbon steels | ◆ ◎ | ◆ ◎ | ◆ ◎ | ||||||
| S45C~ | High carbon steels | ◆ ○ | ◆ ○ | ◆ ○ | ||||||
| SCM | Alloy steels | ◆ ○ | ◆ ○ | |||||||
| 25~35HRC | Heat treated steel | |||||||||
| 35~45HRC | Heat treated steel | |||||||||
| 45~55HRC | Heat treated steel | |||||||||
| 55~63HRC | Heat treated steel | |||||||||
| SUS | Stainless steels(SUS) | ◆ ◎ | ◆ ◎ | |||||||
| SKD | Tool steels | |||||||||
| SC | Cast steels | ◆ ○ | ◆ ○ | |||||||
| FC | Cast irons | ◆ ◎ | ◆ ◎ | ◆ ◎ | ◆ ◎ | |||||
| FCD | Ductile cast irons | ◆ ○ | ◆ ○ | ◆ ○ | ◆ ○ | |||||
| Cu | Copper | |||||||||
| Bs | Brass | |||||||||
| BsC | Brass castings | ◆ ◎ | ◆ ◎ | |||||||
| PB | Bronze | |||||||||
| AL | Wrought aluminum | |||||||||
| AC, ADC | Wrought aluminum | |||||||||
| Mg | Magnesium alloy die castings | |||||||||
| ZDC | Zinc alloy die castings | |||||||||
| Titanium alloys | ||||||||||
| Nickel base alloys | ||||||||||
| Thermosetting plastic | ||||||||||
| Thermoplastic resin |