GB1229 is a Chinese national standard that specifies the requirements for high-strength large hexagon nuts, which are applicable to the field of steel structure. These nuts are designed to be used in conjunction with GB/T 1228 High Strength Large Hexagon Head Bolts for Steel Structures to form friction-type high strength bolting joints.The GB1229-2006 standard specifies the type dimensions, technical conditions and markings of nuts with thread sizes from M12 to M30.

Material: including carbon steel, alloy steel, stainless steel (such as 304, 316, 316L, etc.) and other materials, the specific selection depends on the working environment and application requirements.

Grade: The product grade is different mechanical properties grade (such as 4.8 grade, 8.8 grade, 10.9 grade,A2-70, etc.), these grades reflect the tensile strength, yield strength and other mechanical properties of the bolt. Different grades are suitable for different load bearing requirements and working environments.

Advantage:

HIGH STRENGTH: These nuts are designed to withstand high preloads, ensuring a reliable connection. Corrosion resistance: The materials usually used have good corrosion resistance and are suitable for outdoor use. Precise Manufacturing: Manufactured in accordance with national standards, the dimensions and tolerances are strictly controlled to ensure the accuracy of the fit with the bolt. Compatibility: Used with GB/T 1228 bolts to form a complete high strength connection system.

Scope of Application

Steel Structures: Mainly used for bolting of steel structures such as bridges, towers, high rise buildings etc. Heavy Machinery: In heavy machinery, these nuts are used to withstand high loads and provide a stable connection. Industrial Buildings: In industrial buildings and infrastructures, these nuts are used to ensure structural stability and safety.

Quality Certification

Hebei Bentley is ISO9001:2015 certified and equipped with relevant certificates for quality assurance. Due to its specific dimensions and performance levels, it is suitable for a wide range of industrial and commercial scenarios including, but not limited to: machine building, construction work, transport, energy industry, timber frame connections.

Quality inspection

Bentley has invested a huge amount of money to builda product testing laboratory, equipped with importedhigh-end instruments:such as thread comprehensivescanners, high temperature tensile testing machines,high frequency fatigue testing machines, etc., to ensurethat all products are strictly tested before leaving thewarehouse to ensure the reliability of customers duringuse.