What size are grease fittings?
These are the 1/4″-28 thread and the 1/8″ NPT thread. However, there are other less common grease fitting threads in use. Here are some ways to identify the threads on your grease fittings. The easiest way to identify the thread on a grease fitting is to use a tool made specifically for this purpose.
What is the difference between thread forming and drive type grease fittings?
Using drive type grease zerks can eliminate tapping costs associated with threaded applications. Thread forming grease fittings, or spin drive fittings, feature hardened threads for installation into thin, unthreaded holes.
What are taper thread grease fittings?
Taper thread grease fittings are also referred to as taper thread zerk fittings, taper thread grease zerks, or a taper thread zerk. Several sizes available in both Stainless Steel and Monel.
How to test grease fitting threads?
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. Place the known thread against the unknown thread.
Are all grease fittings the same thread?
What are the different pipe threads used on grease fittings? There are ten common types of pipe thread standards used for grease fittings. SAE‑LT, NPTF, PTF, UNF, UNEF, ISO Metric, BSF, BSPP, BSPT, and German Thread are the most popular.
What tap is used for grease fittings?
Grease Fitting Thread SizeFitting Thread SizeTap Drill Selection For Standard Thread FittingsDrill Size Selection for Spin Drive Fittings1/4"-28#3 (for soft metal use #5)"A" - .234" Dia.5/16"-329/32" (for soft metal use "J")-1/8" Pipe11/32" (for soft metal use "R")3/8 - .375" Dia.*1/4" Pipe7/16"-
Are Zerk fittings NPT?
Alemite is the original manufacturer of Zerk fitting and continues to be the “gold standard” for quality.
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.
What size are grease fittings?
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.
Are Zerk fittings pipe thread?
SAE Products 1/8" pipe thread grease fittings are commonly referred to as 1/8" pipe thread zerk fittings.
What is a 1/4 NPT thread?
As a general “rule of thumb” an NPT thread is approximately 1/4" (0.25”) larger than its “name.” For a 1/4" NPT fitting the “nominal” OD is 0.533”. NPT fittings are slightly tapered so the “nominal” diameter is the diameter in the middle of the threaded portion, as measured by the top (crest) of the threads.
Are there different types of grease fittings?
Three styles are available for the body, including several NPT thread sizes for tapped holes, a self-threading style, and a barbed, or drive, style for insertion into untapped holes. These fittings can also be found with British and metric threads.
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.
How do I know my Zerk fitting size?
0:102:05The trick to tell grease zerks apart - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou can find one at loc and lube comm. But now let me show you a quick trick to tell the differenceMoreYou can find one at loc and lube comm. But now let me show you a quick trick to tell the difference between the quarter twenty eighth and the eighth inch pipe thread using just a tape measure. Okay.
What type of thread is 1/4 28?
UNF - Unified National Fine ThreadsMajor Diameter (in)Threads per inch (tpi)Major Diameter(in)1/4" - 28280.2505/16" - 24240.3133/8" - 24240.37521 more rows
Are there different size grease gun couplers?
Standard, Giant, and Metric Button Head Couplers fit to button head grease fittings with selection based on size of fitting. Grease Gun Adapter Kits are a must-have for any lubrication specialist.
How do you tap a grease ZERK?
3:015:05drilling and tapping a new grease fitting - YouTubeYouTubeStart of suggested clipEnd of suggested clipIt's just going ahead and cutting those fine threads and cleaning them out. There we go nice andMoreIt's just going ahead and cutting those fine threads and cleaning them out. There we go nice and smooth. Now I back it out. And now this new grease fitting should thread right.
Are there different types of grease nipples?
Flush type grease nipples They come in two different types; straight and angular.
Are all grease nipples the same size?
Grease fittings come in many different styles. There are two grease fittings that are very common. These are the 1/4″-28 thread and the 1/8″ NPT thread. However, there are other less common grease fitting threads in use.
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.
What is grease fitting thread?
Understanding grease fitting pipe threads. Grease fittings are a common component found on nearly every mode of transportation or piece of machinery. Pipe threads, which are formed onto the grease fitting's shank, allow a large portion of fittings to securely attach to their mating component.
What is German thread?
German Thread pipe threads are a DIN standard thread established in Germany after the introduction of BSPT threads. Even though it identifies by a different name, it possesses all of the same attributes as BSPT threads. Like BSPT threads, German threads are also tapered to provide an interference fit to reduce the risk of spiral leakage.
What are the different elements of a pipe thread?
Truncation - The material moved from the theoretical V‑thread triangle of the thread form.
What is an UNF thread?
UNF threads are considered a parallel thread and should be accompanied with a sealing compound to provide a leak resistant connection.
When was the first tapered thread standard?
BSF (British Standard Fine) was introduced in 1908 by the British Engineering Standards Association.
When did pipe threads become standardized?
During the mid to late 1800's, pipe thread types started to become standardized across the globe, thus providing manufacturers a means for creating compatible and interchangeable parts.
Do grease zerks need sealing?
These threads are considered self‑sealing and do not require additional sealing compound for a leak free connection.
How to determine the thread on a grease fitting?
Using a specific tool called grease fitting thread gauge is the easiest method to determine the thread on a grease fitting.
What is grease fitting?
Grease fittings are attached to a grease gun to administer a pressure-resistant connection. Also, they have a channel behind the opening that runs straight to the area where you need to grease.
How to connect grease gun to zerk?
Then, angle the coupler to the fitting and press down. Secure the connection by tightening the nozzle on the fitting, and when the coupler clicks into place, start up the grease gun, and let the lubricant flow.
Why are grease fittings important?
Although grease fittings are fundamental to proper machine lubrication, harm and damage could ensue if they are misused. Spotting the most suitable grease fitting may seem like a challenging task but take it easy!
Why does my grease gun get stuck in the fitting?
The gun gets stuck in the fitting because it is clogged by debris or hardened grease. It would help if you clean grease fittings and grease guns before use to avoid the chances of dirt being brought inside the bearing. Make sure the fitting is free of dirt before locking the coupler to the zerk, and do not combine old grease with new grease.
What is flush grease?
Flush type grease fittings are suited for machines where protruding fittings cannot be equipped, such as pulleys, shafts, and other rotating bearings. Flush fittings are not susceptible to erosion since they don’t protrude from the surface like other fittings.
Why is it important to keep grease fittings in tip top shape?
More importantly, keeping your grease fitting in its tip-top shape will help maintain its effectiveness. Doing so will also help you save a ton of money in the long run. Here are some tips on how you can properly maintain your grease fitting.
What is grease fitting?
A grease fitting, grease nipple, Zerk fitting, grease zerk, or Alemite fitting is a metal fitting used in mechanical systems to feed lubricants, usually lubricating grease, into a bearing under moderate to high pressure using a grease gun .
How do grease fittings work?
Grease fittings are permanently installed by either a (taper) thread or straight push-fit ('hammer in') arrangement, leaving a nipple connection that a grease gun attaches to. The pressure supplied by the grease gun forces a small captive bearing ball in the fitting to move back against the force of its retaining spring.
Why is grease fitting important?
The grease fitting improved this penetration , yielding more effective lubrication.
What is sealed bearing?
Sealed bearings are lubricated for life at the factory, and are sealed such that the lubricant is not lost or dirtied. Grease fittings are far from obsolete, however, and much new machinery is built with them every year (e.g., tractors, lawnmowers, industrial plant equipment, and still a few car and truck parts).
What angle is grease gun hose?
The grease gun hose is usually at a sharp angle (e.g. 70-90°) to the axis of the nipple but can be approached from any azimuthal angle. It is not possible for grease pressure to force this type of connector away from the nipple. Grease fittings are commonly made from zinc - plated steel, stainless steel, or brass .
What is the convex shape of a grease gun?
The common convex shape of the fitting allows the simple concave tip of the grease gun to seal against the fitting easily from many angles, yet with a sufficiently tight seal to force the pressured grease to move the ball and enter the fitting, rather than simply oozing past this temporary annular (ring-shaped) seal.
What is the purpose of a grease hole?
The oil hole or grease hole was usually covered with a cap of some kind to keep dirt out, from a simple plug or screw to a spring-loaded hinged cap. Sometimes a cup was mounted, acting as a small reservoir, which could be turned at regular intervals to inject grease into the fitting.
What is grease fitting?
What are Grease/Zerk Fittings? Grease fittings, also known as Zerk fittings, are metal fittings for mechanical systems so that they can feed lubricants into various bearings using a grease gun with medium to high pressure.
What is Aetna grease made of?
Aetna's grease fittings are made of case hardened steel and are heavily zinc plated for maximum corrosion resistance and are manufactured to exacting specifications.
What angle does a Lincoln hydraulic coupler have?
Lincoln hydraulic couplers and fittings are designed to provide angle up to 15°.Movement beyond this angle will cause coupler to disengage.
What is grease fitting?
Grease fittings, also known as zerk fittings or grease nipples, serve as lubrication points on bearing housings or other mechanical components. Their design provides a secure connection to a grease gun coupler for delivering precise amounts of grease into bearings and other moving systems.
How do grease fittings work?
Grease zerk fittings work by acting as a one‑way check valve that allows grease to pass through one way, but not the other. Inside the fitting is a ball check suspended by a spring. As grease is pushed into the fitting, pressure is created against the ball check that compresses the spring allowing grease to pass completely through the fitting. When grease flow stops, the spring pushes the ball check back to its original position, closing the fitting and preventing grease to escape.
What is the most common standard size grease fitting?
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 much grease should I put on a fitting?
The amount of grease put in a fitting depends on the size of the part to which it is attached. As a general rule of thumb, apply grease until you begin to feel resistance while pumping. Do not apply grease until it seeps out of bearing seals or other components.
What are the different types of grease guns?
There are many different types and designs of grease guns, and we offer lever, pistol, cordless, and pneumatic grease guns. We have a gun for practically any application. G.L. Huyett offers the following on our site.
What is a grease zerk?
Intended for light oils and hydraulic fluids, leak‑proof grease zerks are often used in the textile and food processing industries where prevent lubricant leakage is critical. Available in zinc clear, zinc yellow, or traditional steel finish. Designed to provide leak‑proof seals up to 10,000 psi.
What is a button head grease fitting?
Button head grease fittings are a heavier duty fitting identified by their flat, low profile appearance. They are able to handle large grease volume due to their high flow rate and sturdy construction. They are commonly used on conveyors, mining equipment, agricultural equipment, and other rugged applications.
