Classification of hexagon head bolts

When choosing a screw, it is important to clearly consider your needs before choosing a hexagonal bolt that is suitable for your product, the teeth of the screw, the thickness of the rod, including the material of the hexagonal head bolt.

Now let's take a look at several common bolts

• German standard hexagon head bolts DIN933

• National standard hexagon head bolts GB5783

• German standard half tooth hexagon head bolts DIN931

• GB5782 National standard half tooth hexagon head bolts

• Stainless steel screw

German standard hexagon head bolts DIN933

DIN933 name for all-thread hexagon head bolts A and B grade, you can literally understand the regular DIN933 hexagon head bolts for full tooth products, as for the A and B grade means that the hexagon head bolts products are divided into three levels, decibel A, B, C. A grade represents the highest level, that is, the highest precision, B, C in turn, A grade is used for carrying large, requiring high precision or subject to shock, vibration load, so you should also consider this issue when you buy.

GB5783 hexagonal head bolts

GB5783 name for all-thread hexagon head bolts A and B grade, GB5783 hexagon head bolts and DIN933 both M10, M12 specifications will be different in size, the rest of the specifications can be used instead of DIN933.

German standard half tooth hexagon head bolts DIN931

DIN931 name for coarse rod half tooth hexagon head bolts A and B grade, half tooth and A, B grade meaning of the above I have explained to you, that coarse rod is what it means, coarse rod refers to the screw diameter of the toothless part of the screw is thicker than the screw diameter of the screw with teeth.

GB5782 national standard half tooth hexagonal head bolts

GB5782 name for coarse rod half tooth hexagonal head bolts A and B grade, GB5782 hexagonal screws and DIN931 both M10, M12 specifications of the product will differ in size, the rest of the specifications available DIN931 alternative use.

Stainless steel bolt material requirements

1. Boron content up to 0.005%, its non-effective boron can be controlled by adding titanium and (or) aluminum.

2. These performance levels of stainless steel nuts allow the use of easy to cut manufacturing, the maximum content of sulfur, phosphorus and lead: sulfur 0.34%; phosphorus 0.11%; lead 0.35%.

3. In order to ensure good hardenability, stainless steel fasteners with a diameter of more than 20mm fasteners, the need to use the 10.9 grade steel.

4. Carbon content of less than 0.25% (barrel sample analysis) of low-carbon alloy steel with a minimum content of manganese: 8.8 grade: 0.6%; 9.8, 10.9 and 10.9 grade: 0.7%.

5. The product should be added to the performance level code under a horizontal line mark. 10.9 level should be consistent with all the properties of the 10.9 level, and the lower parison temperature on its conditions in the ridicule temperature will cause a different degree of stress weakening.

6. The performance level of the material should have good hardenability to ensure that the core of the stainless steel fastener thread section after quenching, tempering before obtaining about 90% of the martensite organization.

7. Alloy steel should contain at least one of the following elements, the minimum content of chromium 0.30%; nickel 0.30%; molybdenum 0.20%; vanadium 0.10%

8. Consider bearing tensile stress, 12.9 grade surface does not allow the metallographic can be measured white phosphorus aggregation layer.

9. The chemical composition and tempering temperature are still under investigation and study of stainless steel standard parts.

The above are the most commonly used types of hexagonal head bolts, so when you choose the screws, to clearly consider their needs and then to choose a suitable product for their own hexagonal screws, screw teeth, rod thickness, including hexagonal head bolts material are the basis for your choice to consider.

Ningbo yi pian hong Fastener Co., Ltd. was established in 2001, specializing in the production of all kinds of high-strength bolts, nuts and threaded rods, with an annual production capacity of 30000 tons and an annual turnover of 300 million yuan. Products include ANSI / ASTM, DIN, BS, ISO, GB, JS and other standards, which are mainly used in the field of high-strength seals and oil pipeline valves.