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  • The principle and grade of expansion bolts

    principle The fixing principle of expansion bolts: The fixing of expansion bolts is achieved by using the slope of the arch to promote the expansion and generate frictional grip force, thus achieving the fixing effect. One end of the screw is threaded, and the other end has vertebrae. The outer l...
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  • Double threaded wood screw is a type of wood screw with two threads on the screw.

    It usually includes a screw, a screw head fixed at one end of the screw, and a drilling thread set on the screw. Its characteristic is that the drilling thread includes a first thread and a second thread that are sequentially arranged on the surface of the screw along the length direction of the ...
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  • How to choose the carriage bolts that suit your needs?

    Choosing carriage bolts that suit your needs can be considered from the following aspects: 1. Material Carbon steel: relatively low price, high strength, but average corrosion resistance. Suitable for general mechanical structures and less harsh environments. Stainless steel: It has good corrosio...
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  • Classification, composition, and use of expansion bolts

    classification The grades of stainless steel bolts are divided into 45, 50, 60, 70, and 80. The materials are mainly divided into austenite A1, A2, and A4, martensite and ferrite C1, C2, and C4. The representation method is for example A2-70, and before and after “–”, the bolt m...
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  • Elevator Expansion Bolts

    Expansion bolt is a special threaded connector used to fix pipeline supports/hangers/brackets or equipment to walls, floors, or columns. The grades of carbon steel bolts are divided into more than 10 grades, including 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. The numbers before and afte...
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  • Standard types of hexagonal head bolts

    GB/T 2-1985 Ends of fasteners with external threads (eqv ISO 4753:1983) GB/T 90-1985 Acceptance Inspection, Marking and Packaging of Fasteners (eqv ISO 3269:1984) GB/T 196-1981 General purpose threads – Basic dimensions (diameter 1-600mm) GB/T 197-1981 General purpose thread tolerances and ...
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  • Basic content of hexagonal head bolts

    classification Hexagonal head bolts are divided into two types: external hexagonal bolts and internal hexagonal screws. According to the force distribution method of the connection, there are ordinary and hinged holes. The bolts used for hinged holes should match the size of the holes and be used...
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  • GB 102-86 DIN571(HEX LAG BOLTS)

    Hexagonal head bolts are divided into two types: external hexagonal bolts and internal hexagonal screws, usually used for fastening mechanical equipment. Hexagonal head bolt material At present, there are three main materials of hexagonal screws on the market: carbon steel, stainless steel, and c...
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  • High-Strength Double-Thread Wood Screws

    High-Strength Double-Thread Wood Screws

    The retaining ring with an open circular ring structure is a commonly used mechanical component, which has standardized design standards. Its main function is to tighten the ring shaped component on the shaft, which can prevent other parts installed on the shaft from moving. It belongs to a type ...
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  • Introduction, characteristics, and advantages of wooden screws

    Introduction: Wooden screws, also known as wooden screws, are similar to machine screws, but the thread on the screw is a specialized thread for wooden screws, which can be directly screwed into wooden components (or parts) to securely connect a metal (or non-metal) part with a through hole to a ...
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  • Difference between wood screws and self-tapping screws.

    Recently, there was a small friend’s private letter from the small editor of the Olympic Exhibition asking how to distinguish wood screws from self-tapping screws, and he took the opportunity to introduce it to you. Fasteners can be divided into three categories according to the form of thr...
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  • How to take out the expansion screw?

    (1) Knock the exposed bolt into the connecting body with a hammer to separate the expansion bolt part from the expansion pipe. Then clamp the expansion pipe with pliers and pull it out with force. During the process of pulling, hold the screw inward, and then the bolt can be taken out. This metho...
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