Основные международные стандарты резьбы

Буквенное обозначение

Страна

Угол вершины профиля, °

Описание (расшифровка буквенного обозначения)

ISO

60°

International Organization for Standardization

NC

USA

60°

National Coarse

UNC

USA

60°

Unified National Coarse

NF

USA

60°

National Fine

UNF

USA

60°

Unified National Fine

UNEF

USA

60°

Unified National
Extra Fine

UN

USA

60°

Unified National 8-,
12- and 16 pitch series

UNS

USA

60°

Special Threads of
American National Form

NPT

USA

60°

National Taper Pipe 1:16

NPTF

USA

60°

National Taper Pipe
Dryseal 1:16

NPS

USA

60°

National Standard
Straight Pipe

NPSM

USA

60°

National Standard Straight
Pipe for free fitting mechanical

NPSF

USA

60°

National Standard Internal
Straight Pipe Dryseal

BSW

GB

55°

British Standard
Withworth Coarse

BSF

GB

55°

British Standard Fine

BSP

GB

55°

British Strandard Pipe

BSPT

GB

55°

British Standard Pipe Taper

BA

GB

47°

British Standard Association