Hex Head Screw Weight Table: Complete Guide

Hex head screws are divided into two types: outer hex head screws and inner hex head screws.

Depending on how they connect and withstand force, there are common types and those designed for hinged holes. Bolts for pivot holes must match the size of the hole and are used when subjected to lateral forces.

According to the shape of the head, there are hexagonal, round, square and countersunk heads, among others. Countersunk heads are generally used in places where a smooth surface without protrusions is required after connection, as they can be screwed into parts. Round heads can also be screwed into parts. Square heads may be tighter, but their size is quite large. Hexagonal heads are the most commonly used.

In addition, to meet the need for locking after installation, there are screws with holes in the head or shank. These holes prevent the screw from loosening when subjected to vibration.

Hex head screw material

Currently, the market mainly consists of hex screws made from three types of materials: carbon steel, stainless steel and copper.

(1) Carbon Steel.

We classify this into low carbon steel, medium carbon steel, high carbon steel and alloy steel based on the carbon content of the material.

1. Low carbon steel with C% ≤0.25% is commonly referred to as A3 steel in China. It is essentially known as 1008, 1015, 1018, 1022, etc., abroad. It is mainly used for products without hardness requirements, such as grade 4.8 screws, grade 4 nuts and small screws. (Note: Tail nail drilling mainly uses 1022 material).
2. Medium carbon steel contains 0.25%-0.45% carbon. It is currently not widely used on the market.
3. Alloy Steel: This is common carbon steel with alloying elements added, improving some unique properties of the steel, such as 35, 40 chromium molybdenum, SCM435, 10B38. Fangsheng screws mainly use SCM435 chromium molybdenum alloy steel, which contains C, Si, Mn, P, S, Cr, Mo.

(2) Stainless steel.

Performance grade: 45, 50, 60, 70, 80. The primary division is into austenitic (18%Cr, 8%Ni), which has good heat resistance, corrosion resistance and weldability.

A1, A2, A4 Martensite, 13% Cr, has lower corrosion resistance, high strength and good wear resistance. C1, C2, C4 Ferritic stainless steel, 18% Cr, has better forgeability and greater corrosion resistance than martensite.

The current import materials on the market are mainly Japanese products. The main division by series is SUS302, SUS304, SUS316.

(3) Copper.

The commonly used material is zinc-copper brass alloy. The market mainly uses H62, H65, H68 copper for standard parts.

Carbon steel products use the following metal sheets: serial number, type and optional material. 1. Grade 4.8 Hex Bolts 1008K 1010 1015K 2. Grade 6.8 Hex Bolts.

Hex Head Bolt Weight Table

Hex nut specification and weight table

Observation:

1. If possible, do not use dimensions in parentheses.
2. GB41-66 produces coarse thread (Type A); GB45-66 produces coarse and fine threads (Type A and B).