What size is a standard Zerk fitting?
What size is a standard Zerk fitting?
1/4″‑28
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 I know what size grease fitting I have?
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 size thread are grease fittings?
SAE Products 1/8″ pipe thread grease fittings are commonly referred to as 1/8″ pipe thread zerk fittings.
What size Tap do I need for a grease ZERK?
Grease Fitting Thread Size
| Fitting Thread Size | Tap Drill Selection For Standard Thread Fittings | |
|---|---|---|
| 1/4″-28 | #3 (for soft metal use #5) | Quote |
| 5/16″-32 | 9/32″ (for soft metal use “J”) | Quote |
| 1/8″ Pipe | 11/32″ (for soft metal use “R”) | Quote |
| 1/4″ Pipe | 7/16″ | Quote |
Are grease fittings metric?
Metric Grease Fittings are available in both regular and stainless steel. Metric Grease Fittings are also referred to as Metric Zerk Fittings, Metric Lubrication Fittings, Metric Hydraulic Fittings, and Metric Zerks.
Are there different types of grease fittings?
There are three major thread types for grease fittings: metric, taper or parallel, and unified. M5, M6, M7, M8, and M10 are common metric threads. British standard pipe (BSP), pipe thread fine (PTF), and national pipe thread fine (NPTF) fittings use tapered or parallel threads.
What is taper thread for grease fitting?
Taper Thread Grease Fittings are used on cars, trucks and many types of industrial machinery. It is recommended that SAE-LT taper threads (Society of Automotive Engineers Lubrication Threads) be installed into straight holes with a 1/4”-28 UNF-3B straight-threaded hole.
Why is it called a Zerk fitting?
The Zerk design, named after Oscar Zerk, used a fitting much smaller than the Alemite pin-type and did not lock the hose coupler or hand gun and fitting together. Instead, the seal between them was maintained by the pressure of a pushing action when the operator applied the coupler to the fitting.
Are there metric Zerk fittings?
Why are grease fittings called Zerks?
What does PTF mean in grease fittings?
Grease Fitting Symbols
| Symbol | Meaning |
|---|---|
| P.T.F. | Same as N.P.T.F. except full thread length has been shortened by one thread on small end of thread-also designated as P.T.F-SAE Short. |
| P.T.F Special Short | Same as N.P.T.F Short except one full thread has been shortened from large end of thread. |
