Office Chair Long Rod Screws

The common types and specifications of long rod screws for office chairs are as follows:

The long rod screws commonly used in the fixed structure of office chairs are mainly machine screws (bolts). These screws need to be used in conjunction with nuts and are suitable for metal chair frames or scenarios that require disassembly. Their common specifications are nominal diameters of M5-M8, with length ranges between 15-50 millimeters. The specific choice should be determined based on the thickness of the chair frame and the requirements for connection strength. For example, thicker metal brackets may use bolts with M6 or M8 specifications and lengths of over 30 millimeters to ensure connection stability.

For solid wood office chairs, the screw size is usually 6 millimeters in diameter and 30 millimeters in length. This specification balances penetration force with the load-bearing capacity of the wood, preventing wood cracking due to overly long screws or loose connections due to overly short screws. However, it should be noted that different brands and models of solid wood chairs may adjust the size due to design differences, and some custom models may use screws with diameters of 5 millimeters or 8 millimeters.

In addition, other special-specification long rod screws are also used in the installation of office chairs:

• Slim screws: These have a smaller diameter (e.g., M4) and a longer length (over 40 millimeters), suitable for connections that need to penetrate multiple layers of materials or narrow spaces, such as the fixation of the chair back and the seat plate.
• Short and thick screws: These have a larger diameter (e.g., M8) and a shorter length (below 20 millimeters), used for local connections with high load-bearing requirements, such as the fixation of the five-star base and the gas lift.
• Self-tapping screws: Although not strictly "long rod screws", they are commonly used in plastic or thin metal chair frames. Their pointed ends can tap into the material by themselves without pre-drilling, and their lengths are generally around 25 millimeters.

Selection suggestions:

1. Prioritize referring to the screw specifications in the product manual or installation guide to avoid structural damage caused by mixing different types.
2. For metal chair frames, prioritize using machine screws (bolts) in conjunction with nuts; for solid wood chair frames, use wood screws or special self-tapping screws.
3. If replacing screws, measure the diameter and length of the original screws and ensure that the material (e.g., stainless steel, carbon steel) of the new screws is consistent with the original accessories to avoid corrosion or insufficient strength issues.