What does PTF mean in grease fittings?
Pipe Thread Fuel
PTF (Pipe Thread Fuel) threads are similar to NPTF threads featuring an interference, dry sealing fit. The primary difference between PTF and NPTF threads, however, is that PTF threads are shorter in length by one thread turn.
What size thread is a grease zerk?
The most common standard grease zerk size is 1/4″‑28 SAE‑LT and is often used in automotive applications. They can also be found in agricultural environments as well as other various standard duty applications. For heavy-duty applications, larger 1/8″‑27 PTF grease zerk fitting sizes can be found.
How do you size a grease zerk?
The best way to determine thread pitch of a grease fitting is to compare the threads to something with a known thread. A thread pitch gauge is the ideal tool for this but you can also compare the grease fitting threads to a known bolt thread, pipe thread, or another grease fitting.
What is the thread size of a grease fitting?
SAE Products 1/8″ pipe thread grease fittings are commonly referred to as 1/8″ pipe thread zerk fittings.
Are PTF and NPT threads compatible?
While NPT and NPTF are both designed to screw together, NPT requires a seal to be leak proof while NPTF do not. The L1 gauge requirements for NPT and NPTF differ for threads more than ½ in. in size, and thus, are not interchangeable.
Is PTF the same as NPT?
PTF fittings are sometimes generically referred to as 1/8″ NPT, and may be threaded into NPT or NPTF threaded holes. Thread sealant is recommended for use with NPT threaded holes. The large and strong threads on 1/8″-27 PTF pipe thread grease fittings are suited for industrial use.
What size Tap do I need for grease fitting?
Grease Fitting Thread Size
| Fitting Thread Size | Tap Drill Selection For Standard Thread Fittings | Drill Size Selection for Spin Drive Fittings |
|---|---|---|
| 1/4″-28 | #3 (for soft metal use #5) | “A” – .234″ Dia. |
| 5/16″-32 | 9/32″ (for soft metal use “J”) | – |
| 1/8″ Pipe | 11/32″ (for soft metal use “R”) | 3/8 – .375″ Dia.* |
| 1/4″ Pipe | 7/16″ | – |
Are there different size grease fittings?
The most common standard grease fitting size is 1/4″‑28 SAE‑LT and is often used in automotive applications. They can also be found in agricultural environments as well as other various standard duty applications. For heavy duty applications, larger 1/8″‑27 PTF zerk fittings can be found.
How often should you grease zerk fittings?
I usually grease every every 3000 miles.
Are all grease guns the same size?
There is effectively just one size. There are some other weird ones out there, the common being button head I believe, but if it looks like a standard grease zerk it is going to be the standard size.
Are Zerk fittings NPT?
Alemite is the original manufacturer of Zerk fitting and continues to be the “gold standard” for quality. These fittings have an 1/8″ NPT thread, Trivalent zinc plating, and are R0HS compliant.
Is NPT the same as PTF?