What is a SAE thread?

What is SAE thread? SAE stands for the Society of Automotive Engineers. SAE fittings are mostly used in refrigeration, automotive piping systems and other low-pressure applications. It's common for copper tubes to be used with SAE threads. SAE Flare (SAE J512)

Are SAE and NPT the same?

What's the difference between SAE & NPT threads? The biggest difference is SAE is a straight thread, it needs additional O-ring, gasket or sealing surface to form a seal; NPT thread is a taper thread, it can form a seal using its thread pitch.

Are SAE and UNF threads the same?

There are two general types of SAE bolts (sometimes referred to as machine screws). UNF (fine thread pitch) has more threads per inch than the same diameter bolt in the UNC (coarse thread pitch). Nut dimensions are maximums per SAE.

Is SAE straight thread?

SAE O-Ring Fitting Guide

SAE O-ring (O-Ring Boss) are straight thread fittings that seal using a O-ring between the thread and the wrench flats of the fitting. The O-ring seals against the machined seat on the female port.

Is SAE fine or coarse thread?

USS are coarse threads, while SAE are fine threads. Check your state and local codes before starting any project. Follow all safety precautions.

The Original Thread Checker SAE/Inch and Metric

How do I know if my thread is fine or coarse?

Threading are uniform ridges of varying height and width (from fastener to fastener) that wrap around a cylinder. This helical shaped threading can be either wide set and deep which are considered coarse thread while a more narrow helical shape with shallow ridges is considered to be fine thread.

Is SAE an UNF?

The Unified Thread Standard uses the term UNC (Unified Coarse) to describe a fastener that previously would have been designated USS and the Unified Thread Standard uses the term UNF (Unified Fine) to describe a fastener that would have previously been designated SAE.

How is SAE thread size measured?

Use a thread pitch gauge to determine the number of threads per inch or the distance between threads in metric connections. Place the gauge on the threads until the fit is snug. Match the mea- surement to the charts. Measure the thread diameter with an I.D./ O.D.

Is SAE O-ring boss?

SAE Straight Thread O-ring or O-Ring Boss (ORB) is a multipurpose thread ideal for medium and high-pressure hydraulic applications. The male thread contains an o-ring at the base which mates with a chamfer machined into the female counterpoint, which makes this thread type ideal for non-leak applications.

What are the 3 basic types of threads?

There are three standard thread series in the Unified screw thread system that are highly important for fasteners: UNC (coarse), UNF (fine), and 8-UN (8 thread).

Is UNF and NPT the same?

UNF is Unified Fine thread, the successor to the obsolete National Fine (NF) thread. NPT National pipe thread is used (in the U.S.) for plumbing of water and gas pipes, and threaded electrical conduit. NPT is defined by ANSI/ASME standard B1.

ARE AN and SAE fittings the same?

The SAE went on to adopt this JIC standard as well. It's important to note that the AN and JIC specifications are no longer in existence in most cases. The majority of the hydraulic population agrees, the JIC (or SAE) 37 degree fittings are generally interchangeable with AN fittings.

How do I know what type of thread I have?

To identify whether the thread is tapered or parallel, look at the diameter of your thread. If the thread diameter gets thinner towards the end, you are looking at a tapered thread. On the contrary, if the thread diameter is the same at the top and the bottom of the thread, you have the parallel thread.

What does SAE and USS stand for?

USS= United States Standard (developed by the Navy) SAE= Society of Automotive Engineers.

What is a SAE port?

A threaded hole and stud system that may be used to attach fittings to a component or manifold. Sealed with an o-ring or gasket.

Are UNC and NPT threads compatible?

Threads are divided into four primary main types: NPT, G/BSP, PT, metric or UN/UNF. Most North American hydraulic and pneumatic components are compatible with National Pipe Threads (NPT), or Unified Threads (UN/UNF).

Is NPT the same as BSP?

NPT and BSP threads are not interchangeable due to the differences in thread forms. NPT threads are pointed in the peaks and valleys, where BSPs are rounded. Most notably, the NPT thread angle is 60 degrees versus the BSP 55-degree angle.

Is orb and NPT the same thread?

Options like these make ORB fitting orientation easier than some other fittings because the o-ring is the sealing factor and not the threads. ORB fittings can be confused with other connection systems, such as NPT or even JIC. For example, this straight thread connection uses the same threads as the JIC 37° fitting.

What is SAE vs metric?

SAE & Metric: What's the Difference? SAE sockets are sized in inches and fractions of inches. Metric and SAE wrenches have different systems of measurement. Metric sockets and wrenches use the metric measurement system.

What is UNF fittings?

UNF Threaded Stainless Steel Fitting is a fastener for connecting a pipe and a female body. UNF thread is parallel.

Is 1.5 coarse thread?

Understanding Inch & Metric Thread Callouts

5 (coarse) thread has a 1.5mm pitch, while an M10x1. 25 (fine) thread has a 1.25mm pitch.