
| c contr | hip ol — K | style neutr | al po | sitive | thread profi le | standard | tolerance class | cresting | application | page(s) |
| NT-K | NT | NTP | Partial Profi le 60° | – | – | N | General use for 60° thread forms, such as ISO and UN, where non-cresting inserts are desired to cut a variety of pitches. | F13–F15 | ||
| NT-CK | Partial Profi le 60° — coarse pitch | – | – | N | Coarse pitch 60° thread forms, such as ISO and UN, where non-cresting inserts are desired to cut a variety of pitches. | F15 | ||||
| NTF | NTK | Partial Profi le 60° — fi ne pitch | – | – | N | Fine pitch 60° thread forms, such as ISO and UN, where non-cresting inserts are desired to cut a variety of pitches — able to thread close to shoulders. | F16 | |||
| NTC | American UN | ANSI B1.1:74 | 2A/2B | Y | Widely used inch-based 60° V-form for all industries. | F17 | ||||
| NJP | UNJ | SAEA588791 | 3A/3B | N | Controlled root radius on external threads for military and aerospace industries. | F18 | ||||
| NJK | UNJ — fi ne pitch | SAEA588790 | 3A/3B | N | Controlled root radius on external threads for military and aerospace industries — able to thread close to shoulders. | F18 | ||||
| NDC-V | NPT | ANSI/ACME B1.201: 1983 | Standard NPT | Y | National Pipe Thread standard forms for pipe fi ttings. | F18 | ||||
| NDC-V-M | NPT — multi-tooth | ANSI/ACME B1.201: 1983 | Standard NPT | Y | High-productivity multi-tooth threading inserts for NPT threads. | F19 | ||||
| NWC-E | Whitworth, BSW, BSP | BS 84:1956, ISO 228/1: 1982, DIN 259 | Medium Class A | Y | Widely used 55° form for gas and water connections. | F19 | ||||
| NDC-RD | API Round | API STD. 5B:1979 | Standard API RD | Y | 60° V-form with large radius for casing, tubing, and line pipe in the oil and gas industry, including 8 and 10 round forms. | F20 | ||||
| NA | Acme | ANSI B1.5:1988 | 3G | N | 29° truncated thread form for motion applications in a wide variety of industries. | F21 | ||||
| NAS | Stub Acme | ANSI B1.8:1988 | 2G | N | Shallow depth 29° truncated thread form for motion applications in a wide variety of industries. | F22 | ||||
| NTB-B | American Buttress — 45° clearance fl ank leading (Pull) | ANSI B1.9:1973 | Class 2 | N | Sawtooth form for axial load bearing applications in a variety of industries — use the “B” style when the 45° clearance fl ank is the leading fl ank. | F22 |
LWID_Master16_Turning_Threading_F008_F009_Metric_REBRAND.indd 8ViWID M16 TiThdiF008 F009 M i REBRAND N b 11 2015 8 22 AM 11/11/15 9:28 AM