1. Classification by purpose

 

 1.1 T-bolts for HALFEN channel steel, the most commonly used is 45# steel, forged, quenched and tempered; also low-carbon steel, more useful alloy steel, stainless steel 304 and 316; according to actual needs Choose the material and mechanical performance level, the surface treatment includes chemical blackening, electro-galvanizing, hot-dip galvanizing, dacromet, dacromet after mechanical galvanizing and so on.

 

1.2 T-bolts for aluminum alloy profiles, also known as hammer head bolts, are made of SUS304 stainless steel and medium carbon steel. The surface of medium-carbon steel T-screws can be galvanized or nickel-plated and Dacromet, etc., carbon steel T-bolts The material is 1045 medium carbon steel, produced by the red satin process, the grade after heat treatment is 8.8, generally the die plate bolt, the T-shaped screw can be directly put into the groove, and can be automatically positioned and locked during the installation process, and the T-shaped bolt is generally Used in conjunction with flange nuts, it is a standard connection fastener when installing corners. T-bolts are selected according to the groove width of the profile.

 

1.3 T-bolt for water supply system,

 

1.4 T-bolts for T-slots, generally refer to the national standard GB37-88

 

1.5 T-bolts are used for construction fasteners, which are mainly locked and fixed by construction scaffolding. Low-carbon steel is mainly produced. Generally, it is matched with a flange nut. The most commonly used are M12, M14, American standard UNC1/2-13 and British standard BSW1/2-12 teeth.

 

Second, according to the standard model:

 

2.1 National standard GB37-88 T-slot bolts. This standard specifies B-level T-slot bolts with M5-M48 thread specifications. This national standard stipulates that the diameter is less than or equal to the specifications below M39, the mechanical performance level is generally 8.8, and the mechanical performance level greater than M39 is generally negotiated with the customer; and the standard description: "Due to structural reasons, T-slot bolts are used No wedge load and head-bar bonding strength test.” This standard has 12 specifications including M5, M6, M8, M10, M12, M16, M20, M24, M30, M36, M42, M48, the shortest length is 25, the longest 300.The surface treatment is mainly chemical blackening and galvanizing passivation.

 

2.2 Machinery industry standard JB/T 8007.2-1999|Machine fixture parts and components T-slot quick-release bolts;

 

2.3 German standard DIN787,

 

2.4 German standard DIN186 T-shaped square neck bolts;

 

2.5 German standard DIN188T type double neck bolts;

 

2.6 German standard DIN261.