Bolts with cylindrical heads and hexagonal grooves

Product name:4.8 Hot-dip Galvanized Hex Socket Head Cap Screw

Product Standards：GB /T 70.1 - 2000

                                   DIN 912 - 1983

                                   ISO 4762 - 2004

                                   JIS B 1176 - 2014

                                   ANSI/ASME B 18.3.1M - 1993

Common Specifications：

Thread diameter：M6\M8\M10\M12\M14\M16\M18\M20\M24

Thread length：20mm\25mm\30mm\35mm\40mm\50mm\60mm\70mm\80mm\90mm\100mm

Product material：Q235B

Product grade：4.8

Surface treatment：hot dip galvanized

Industry use：Machinery Industry、achitechive

Production site: Handan City, Hebei Province, China

Means of transaction：TT/LC

MOQ：2Ton

Product packaging：Tray+Carton

Delivery period: 30 days

1. What are the national standards for hexagon socket bolts?

Hexagon socket head cap screw standard GB/T 70.1-2007 Hexagon socket head cap screw standard specifies the thread specification for M6~M20 socket head cap screws. It specifies the type, basic size, technical requirements, test methods, inspection rules, packaging, marking, transportation of screwdrivers Hexagon socket head cap screws and storage standard are suitable for hexagon socket head socket head screwdrivers. The size of the socket head cap screws should meet the national standards, and the product quality has passed ISO9001:2000 quality system certification, and the quality is stable and reliable. 8.8 Screw performance grade: minimum tensile strength 830MPa, hardness ( HRC) 23-34.

2. How to measure the size and length of the hexagon socket bolt？

First, measure the total length L of the hexagon socket head screw through the vernier caliper, and then measure the length l of the bolt head, so that the total length L-l is the length of the screw.

Hexagon socket head cap screws (English name: Hexagon socket head cap screws), also referred to as hexagon socket head bolts, cup head screws, and socket head cap screws, have different names, but the meanings they represent are the same.

The national standard national standard for hexagon socket head screws is national standard GB70.1-2000. There are many specifications and sizes. The commonly used specifications are 3*8, 3*10, 3*12, 3*16, 3*20, 3*25 , 3*30, 3*45, 4*8, 4*10, 4*12, 4*16, 4*20, 4*25, 4*30, 4*35, 4*45, 5*10, 5 *12, 5*16, 5*20, 5*25, 6*12, 6*14, 6*16, 6*25, 8*14, 8*16, 8*20, 8*25, 8*30 , 8*35, 8*40, etc.

Hexagon socket head bolts are classified according to the hardness of the screw wire, tensile force, yield strength, etc., that is, the level of the hex socket head bolts, and what level the hex socket head bolts are. Different product materials are required to have different grades of hexagon socket head bolts corresponding to them.

Hexagon socket head bolts are divided into ordinary and high-strength according to the strength of the grade. Ordinary hexagon socket head bolts refer to 4.8, and high-strength socket head bolts refer to 8.8 and above, including 10.9 and 12.9. 12.9 hexagon socket head cap screws generally refer to knurled, natural black hexagon socket head cap screws with oil.

The performance grade of hexagon socket head cap bolts for steel structure connection is divided into more than 10 grades such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. Among them, the bolts of 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are Heat treatment (quenching, tempering) is generally referred to as high-strength bolts, and the rest are generally referred to as ordinary bolts. The bolt performance grade label consists of two parts of numbers, which represent the nominal tensile strength value and yield ratio of the bolt material respectively.

What has been explained in detail above is the knowledge about the measurement method of the size and length of the hexagon socket head bolt and the examples of national standard parameters. From this, it can be seen that, as a representative series of bolts, although the products are easy to be ignored because of their small size and volume, they play a controlling role in many large instruments and tools, so they are indispensable.

http://www.senhong-fastener.com/