Fasteners space the nuts, bolts, screws, and also other little components that store machinery and also components with each other in functioning order. Countless fasteners occupational through the reliable use of threads (left-hand thread and also right-hand thread), which allow nuts and also bolts come screw together effectively.

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But just how do object work? The direction in which workers screw and unscrew fasteners has actually a lot to carry out with the applications in which castle appear. Additionally, plenty of different varieties of subject exist come optimize various ways to fasten objects. In this blog, we explore a few of the countless different varieties of threads and their uses.

Common Uses and also Applications of Fastener Threads

Screw threads aid with plenty of different applications, together as:

Fastening: Screw threads appear on classic fasteners such as nuts, bolts, and screws, and they also help connect threaded pipes, hoses, caps, and fixturesLinear object movement: Fastener threads can be used to transform rotary activity to linear motion

Understanding Right-Handed vs. Left-Handed Threads

Thread Terminology and also Different Types

Threads are constant helical ridges ~ above cylindrical fasteners. For parts such together screws, the ridges will certainly be ~ above the exterior, and parts choose nuts have actually ridges inside of their cylindrical bodies.

There are a variety of common terms to describe different facets of threads, which we define below:

External threads: Threads that wind about the exterior the a fastener’s shaftInternal thread: Threads that operation along the within of a fastenerAxis: Longitudinal lines supplied to measure up the length of the fastenerPitch: The distance in between a allude on one thread come a point on an additional threadMajor diameter: The largest inner or outside thread diameterMinor diameter: The smallest internal or outside thread diameter


Fastener Threads: What is a Screw Thread?

Screw threads are sloped helices the spiral down the cylindrical surface of parts like screws and also bolts. They’re responsible for converting energy in between rotational and also linear movement and force. Fasteners with compatible threads can provide tight seals because that a wide range of equipment.

Screw Handedness: Left-Hand Thread and Right-Hand Thread

Screw handedness refers to the direction that a screw’s subject wraps about its shaft. Right-handed threads run clockwise, and left-handed threads operation counterclockwise. The origin of a thread’s handedness is rooted in person physiology: Screws with various handedness are ergonomic for world depending top top their dominant hands.

Most screws this day use right-handed threads, and also it’s rarely to discover a left-handed screw provided in any kind of application the doesn’t specifically speak to for it. However, there are some applications that specifically call for the usage of left-handed fasteners.

Uses and Applications of Left-Handed Threads

Left-handed object are additionally known as reverse threads. These threads are used in specialized applications in i beg your pardon the application of press would force a right-handed screw or bolt to come loose.

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Some applications that advantage from the use of left-handed fasteners include:

Heating and plumbing: pipe are frequently fitted through both right- and also left-handed threads to carry out an extra layer of defense indigenous leakageSafety: Gas-supply valves usage left-handed threads to identify them from the valves that regulate oxygen

Quality Fastening options by nationwide Bolt

National Bolt builds custom nonstandard fasteners, large-diameter products, and more, and also we pride ourselves on our rapid turnaround and also delivery times.


If you would like to learn much more about our custom fastening solutions, don’t hesitate come reach out to us or request a quote today!

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