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Visual inspection and dimensional inspection requirements for fasteners
2021-11-15 00:00
Visual inspection 1) Is the supplier identification and performance level identification required? a Bolts and screws with performance level ≥ 4.8 must be marked; b Nuts with performance level ≥5 must...
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Typical processing route of fasteners
2021-11-15 00:00
1. Small size bolts below 8.8 (M16 and below) Raw material selection: low carbon steel (Q235, 08, 10, 18, etc.) Blank forming method: cold heading Thread forming: rolling or thread rolling (selection ...
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Disadvantages of zinc-chromium coating process for fasteners
2021-11-15 00:00
Although zinc-chromium coating has many advantages, it also has some shortcomings, mainly reflected in: 1). The zinc-chromium coating contains chromium ions that are harmful to the environment and the...
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Anticorrosive process of fasteners
2021-11-15 00:00
Oxidation is also called blackening or bluing. The workpiece is heated in a solution of air, water vapor or chemicals at room temperature or an appropriate temperature to form a blue or black oxide fi...
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Main uses of fastener plating process
2021-11-15 00:00
Surface treatment is a process of artificially forming a surface layer on the surface of the substrate material that is different from the mechanical, physical and chemical properties of the substrate...
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The main purpose of heat treatment of fasteners
2021-11-15 00:00
The heat treatment of fasteners is a comprehensive process that puts the material in a certain medium for heating, heat preservation and cooling, and controls its performance by changing the surface o...
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Introduction to the production process of fasteners
2021-11-15 00:00
The coil element, also known as wire or coil material, is made by heating and rolling steel billets. (Hot-rolled wire rod cannot be used for the production of fasteners due to its size and surface qua...
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What are the materials used for common fasteners
2021-11-15 00:00
1. Bolts, studs, screws: Carbon steel is generally used for grades 3.6, 4.6, 4.8, 5.6, 5.8, and 6.8, and no heat treatment is required; Grades 8.8 and 9.8 are generally selected from low carbon alloy ...
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The marking of fasteners can be simplified
2021-11-15 00:00
Simplified marking of fasteners The marking of fasteners can be simplified according to the following simplification principles: 1) The age of fastener names and standard numbers are allowed to be omi...
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Marking method and complete marking of fasteners
2021-11-15 00:00
Thread fit is the size of looseness or tightness between screw threads. The level of fit is the prescribed combination of deviations and tolerances on internal and external threads. For unified inch t...
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Threads formed along one spiral are called single threads
2021-11-15 00:00
The diameter of the thread is divided into large diameter (D or d), small diameter (D1 or d1) and middle diameter. The large diameter of ordinary thread and ladder thread is also called the nominal di...
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The trapezoidal thread is a commonly used transmission thread
2021-11-15 00:00
On the section passing through the thread axis, the outline shape of the thread is called a thread profile. It has triangle type, ladder type, sawtooth type and square type, etc. Different thread toot...
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