Stainless Steel Threaded Pipe Cap, Female PT
Closes off a male-threaded pipe end and holds line pressure. Round cap with a female PT taper thread, 202, 304 or 316 stainless steel, 1/8″ to 4″, Class 150.
Product overview
A stainless steel threaded pipe cap screws onto a male pipe end and closes it. That is the whole job, and it is a different job from a plug: the cap has the female thread and goes over the pipe, the plug has the male thread and goes into a fitting. Reach for the cap when a run ends in a bare pipe thread and the line has to stay closed under pressure: a spare branch, a stub left for a future connection, an instrument or sampling point that is not in use.
Ours is shell mold cast in our own plant in Taiwan in 202, 304 or 316 stainless steel and machined after casting, with a round body and a female PT taper thread. Sizes run 1/8″, 1/4″, 3/8″, 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″, 2-1/2″, 3″ and 4″. PT is the Japanese designation for the 55° taper thread that BSPT, R and Rc also describe; it seals on the thread with tape or sealant. It is not the same as NPT, which is a 60° thread and should not be mated with it even where the nominal sizes look alike. If your line is NPT, tell us with the inquiry; NPT is made to order.
The pressure class is 150. On stainless threaded fittings that number is a class designation, not a limit of 150 psi; the working pressure depends on temperature and is set by the fitting standard the class belongs to. For water, air and general fluid lines at ordinary temperatures it carries more than the pipe it closes.
304 covers water, air and general service. 316 carries molybdenum, which is what resists chloride pitting, so specify it where the fluid or the surroundings bring chlorides: brine, coastal sites, frequent washdown, most chemicals. A capped branch is a dead leg, so if the line sees chlorides the cap should be 316 like the rest of it. It matches our stainless steel hex pipe nipple and threaded 45 degree elbow, so one take-off list covers the whole threaded run.
- Model
- FT-CAP
- Body
- 202, 304 or 316 stainless steel
- Size range
- 1/8″ to 4″
- Thread
- Female PT (BSPT) taper thread, one end; other end closed
- Other threads
- NPT made to order
- Pressure
- Class 150
Applications
Every fitting checked for size and thread.
Each fitting is checked for dimensions and thread before shipment.
What is the difference between a pipe cap and a plug?
A cap has a female thread and screws over a male pipe end. A plug has a male thread and screws into a female fitting. This is the cap: use it to close an exposed pipe end.
What thread is it?
Female PT taper thread. PT is the same 55° taper thread as BSPT and Rc. If your line is NPT, tell us with the inquiry; NPT is made to order.
Should I choose 304 or 316?
304 for water, air and general service. 316 where chlorides are present: brine, coastal sites, washdown, most chemicals. A capped branch is a dead leg, so match the grade of the line.
Does Class 150 mean 150 psi?
No. Class 150 is a designation, not a pressure limit. The working pressure depends on temperature and is set by the fitting standard the class belongs to; at ordinary temperatures it is well above 150 psi.
What sizes can I order?
1/8″, 1/4″, 3/8″, 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″, 2-1/2″, 3″ and 4″. Mixed sizes in one order are fine; send the list and we quote it together.
Do you make the matching fittings?
Yes. Hex nipples, elbows, couplings and the rest of the threaded stainless range in the same grades and sizes. Send one take-off list and we quote it as one.
