KF-40 to NPT adapters connect a threaded pipe port to a KF-40 (NW40) flange. They are used to bring gauges, valves, pumps and other threaded components into a KF vacuum system. LoCo Science carries KF-40 to NPT adapters in male (MNPT) and female (FNPT) threads from 1/8" to 2", all turned from solid 304 stainless steel bar with no welds.
Which KF-40 to NPT adapter do I need?
- Screw into a threaded port: Use a male (MNPT) adapter.
- Accept a threaded fitting or pipe: Use a female (FNPT) adapter.
- Match the thread size: Choose the NPT size of your port or fitting: 1/8", 1/4", 3/8", 1/2", 3/4", 1", 1.25", 1.5" or 2".
- Connect the flange side: One KF-40 clamp and centering ring set.
Frequently asked questions
How do I seal the threads on a KF-40 to NPT adapter?
Wrap the male threads with PTFE thread tape, or use an anaerobic pipe-thread sealant for a permanent joint. For threads 1" and larger, a liquid pipe-thread sealant is the better choice. Avoid plumber's pipe dope in vacuum lines.
Are LoCo's KF-40 to NPT adapters welded?
No. They are turned from solid 304 stainless steel bar, without welds.
What NPT sizes are available for KF-40?
1/8", 1/4", 3/8", 1/2", 3/4", 1", 1.25", 1.5" and 2" NPT, each in male (MNPT) and female (FNPT).
