- Norms for threads
- Cylindric, metric thread acc. DIN 13
- Conical, metric male thread acc. DIN 158
- Cylindric withworth-pipe threads acc. DIN/ISO 228
- Withworth-pipe thread acc. DIN/ISO 2999 outside conical, inside cylindric
- Withworth-pipe thread acc. DIN/ISO 3858 inside thread cylindric, outside thread conical
- American conical pipe thread acc. ANSI/ASME B 1.20.1 – 1983 inside thread conical, outside thread conical
- Screw-in taps and screw-in holes with metallic sealing rim DIN 3852
- Screw-in taps and screw-in holes with elastomer sealing caused by soft sealings DIN 3852
- Screw-in taps and screw-in holes with sealant (sealing in the thread)
- Security
- Correct assembly
- Sealing materials, ranges of temperature
- Sealing of conical threads on screw connections with liquid sealant
- Sealing of conical threads on screw connections with teflon-stripe