Technical Information Common Thread Forms
ISO M( Metric) and UN( Unified National) UNJ( controlled root radius) Whitworth( BSW)
Use: All branches of mechanical industry. Use: Aircraft and space industry.
Use: Fittings and pipe couplings for gas, water, and sewer lines( replaced by ISO).
American Buttress NPT( American National Pipe Thread) BSPT( British Standard Pipe Thread)
1 / 2 D play
1 / 2 D1 play |
1 / 2 D2 play |
axis of screw taper 1:16 |
axis of screw |
taper 1:16 |
Use: Fittings and pipe couplings. Use: Fittings and pipe couplings. Use: Pipe thread for steam, gas, and water lines.
TR DIN 103 Acme Acme, truncated( Stub)
nut 1 / 2 D play
1 / 2 D play
Use: Mechanical industry for motion transmission screws. screw
1 / 2 D1 play 1 / 2 D2 play
A = 0,0307 P B = 0,3707 P— x D play C = 0,3707 P—( D1 play— D2 play) Use: Acme-General is used in mechanical industry for motion transmission screws.
1 / 2 D1 play 1 / 2 D2 play
A = 0,4224 P B = 0,4224 P— x D play C = 0,4224 P—( D1 play— D2 play) Use: Where normal Acme is too deep.
API Casing and Tubing Round Thread Form
F80 taper = 62,5mm per metre on diameter
NOTE: Taper shown exaggerated. pitch line widia. com
KL-TECH s. r. o. | www. klte. cz