Product Description：?

Product Name: Carbon Steel Truss Head Torx Drive Machine Screws?

Size standard: All Bolts meet ASME Standard ASME B 18.6.3 (T25-VI) -2013?

Truss Head Torx Drive Machine Screws (also known as Star Drive Mushroom Head Screws) perform better in anti-skid and high torque scenarios. The design of the Truss Head distributes pressure over a larger area, thereby reducing the risk of damage to softer materials such as thin metal sheets and plastic parts. Compared to head shapes with higher protrusions such as hexagonal heads, the large flat head is closer to the installation surface and more suitable for applications that require a flat appearance. At the same time, the plum blossom groove can withstand higher torque than traditional cross or straight grooves, reducing the risk of tool slippage in the groove and protecting the screw head from damage. It also has a certain anti-theft effect.?

?

These types of screws are commonly used in 1. Home appliance manufacturing industry: fixing refrigerators and air conditioning housings for high-frequency assembly and anti slip function; 2. Automotive and transportation: interior parts, brake systems, ventilation duct connections for vibration resistance, high strength, durability; 3. Industrial machinery: gearboxes, motor housings, control cabinets for high load, repeatable disassembly and assembly, and other multiple industries.?

?

The Torx Mushroom Head Screws for carbon steel and alloy steel materials refer to different standards in different usage scenarios, such as the mechanical and material requirements for SAE J429 external threaded fasteners in the automotive industry, ASTM 574 alloy steel material standards, while machine screws usually refer to ASME B 18.6.3. 1. Carbon steel should be in the un quenched state, unless otherwise specified. Machine screws should be low carbon steel without heat treatment, such as grades 1008 to 1022, with a hardness of Rockwell B69-100. 2. Carbon steel should be quenched. When specifying hardening machine screws, they should be made of low carbon steel or medium carbon steel, such as 1018 to 1038, boron containing or boron free materials, and hardened to achieve a Rockwell hardness of 25-38HRC.?

?

When the material is formed by cold heading with carbon steel and undergoes quenching and tempering, its Rockwell hardness is below 32HRC. It is suitable for surface treatments such as black zinc, yellow zinc, blue zinc, nickel plating, chrome plating, zinc nickel alloy, and oxidation blackening. When the Rockwell hardness is greater than 33HRC, it is recommended to use oxidation blackening and zinc aluminum coating overlay treatment (Dacromet coating, Geomet coating, Magni coating, etc.). Sometimes, for better wear resistance and corrosion resistance, hot rust treasure coating reinforcement is also carried out. If Zinc treatment is required, the treated screws need to be subjected to hydrogen displacement treatment to prevent hydrogen embrittlement during use.?

Thread Spacing and Thread Diameter:
The thread spacing that LeKou metal products can provide is UNC. The thread diameters that can be provided are 6 #, 8 #, 10 # -24 UNC、/12#-24UNC,1/4-20UNC、5/16-18UNC、3/8-16UNC、7/16-14UNC、1/2-13UNC，5/8-11UNC，3/4-10UNC, The corresponding diameter of the groove is between Torx10-T60. The length can reach 8 inches, and the thread is usually full or half threaded, depending on the customer's choice.

?