The Threads of Fasteners

1.1 Overview

Fasteners refer to components that serve a fastening function. Threaded fasteners are fasteners with threads, manufactured to specific dimensions. They perform their primary function through the mutual engagement of external (male) and internal (female) threads. It is precisely this functionality that allows threaded fasteners to play a significant role in connecting and securing objects, as well as in the movement of objects.

1.2 Classification of Fasteners

· Key

· Pin

· Weld nail

· Rivet

· Wood screw

· Self-tapping screw

· Assembly and connector pair

· Bolt

· Stud

· Screw

· Nut

· Washer

· Retaining ring

1.3 Threads

1.3.1 Classification of Threads (By Application)

Threads can be categorized into four types based on their application:

① Fastening Threads:

· General-purpose threads

· Transition fit threads

· Interference fit threads

· Miniature threads

· MJ threads

② Power Transmission Threads:

· Trapezoidal threads

· Buttress threads

· Square threads

③ Pipe Threads:

· 55° thread angle pipe threads

· 60° thread angle pipe threads

· Metric taper threads

· Dryseal pipe threads

④ Specialized Threads:

· Threads for optical instruments

· Short-pitch trapezoidal threads for forged steel valves

· Machine tool lead screws with trapezoidal threads

· Petroleum threads

· Gas cylinder threads, etc.

(JNZC) Jinan Zhongchuan Equipment Co., Ltd 

- A Leading manufacturer of Critical Fasteners & Precision Machining Parts

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