Custom fasteners Manufacturer

Hex Socket Cap Sems Screws|SEMS Bolts

Type: Socket cap screws,sems screws,sems bolts,hex bolts

Material: stainless steel

Finish: Passivated


Standard: Inches, Metric


The cylindrical head hexagon socket cap SEMS screw is generally an assembly that is fastened together by a hexagon socket head cap screw, a spring washer, and a flat washer. The hexagon socket combination screw is divided into a 4.8-grade hexagon socket combination screw and 8.8 grade hexagon socket combination screw according to the material. Its general material on the market is 8.8 grade hexagon socket sems bolts. General screw manufacturers use screw wire 10B21 to produce. Hardening reaches 8.8 grade, but hydrogen needs to be removed to prevent spring washers and hexagon socket bolts from breaking.

Hexagon socket sems screws are widely used in electrical, electric power, machinery, electronics, household appliances, furniture, ships, and so on. The Hexagon socket SEMS bolts are mostly used for the connection between thin metal plates and play a connecting role. When connecting, first make a threaded bottom hole for the connected part, and then screw the hexagon socket combination screw into the threaded bottom hole of the connected part. Due to the high hardness of the thread surface of the combination screw, the internal thread can be tapped in the threaded bottom hole of the connected part, thereby forming a high-strength hexagon socket combination screw for connecting steel structures, mainly used for railway and highway bridges, boiler steel Structures, industrial plants, high-rise civil buildings, tower mast structures, hoisting machinery and their steel structures require the use of friction-type high-strength hexagon socket combination screws. Its characteristic is the hexagon socket bolt.

When installing, a special electric wrench must be used, which has two sleeve heads up and down, one set on the hexagon nut, and the other set on the head of socket cap bolts. When tightening, apply a clockwise torque to the nut, and apply an equal and counterclockwise torque to the dodecagon of the bolt, so that the connection neck between the end of the hexagon socket screw and the dodecagon is subjected to torsional shear until the neck is sheared So far, the installation has come to an end.

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As a 20-year industry experience manufacturer with a factory equipped with precision machines, we can provide, from consultation to production, a one-stop solution for you. For an accurate quotation, you need to tell us the following information:


Please tell us the specific details, like what is material and finish do you, and the fastener size, if you have drawings or pictures, please send them to us


Normally small order quantities are acceptable, while large quantities can help us to lower the cost and get you a more competitive price.


Tell us your application or detailed information for your projects. We can offer you the best choice, meanwhile, our engineers can give you more suggestions under your budget.

What We Can Offer You..

Best Quality

We have rich experience in the manufacture, design, and application of custom fasteners, and served more than 10000 customers worldwide

Competitive Price
we have an absolute advantage in the cost of raw materials. Under the same quality, our price is generally 10%-30% lower than the market.

With more than 22 years, we already have completed the control system and test equipment, we can provide all tests you need


Any feedback will be replied to within 24hours, We provide a 3-5 years guarantees policy. And all costs by us will be on our account.

Fast delivery

If you need urgently, we can deliver samples within 8hours. Bulk order can be within one week

Why Choice us

About Us

Shenzhen Heat Hardware Co., Ltd is a leading custom screw manufacturer in China founded in 2000 years. We are specializing in custom screws, security screws, Sems screws, Chicago Screws, Weld Screws, Long screws, Micro Screws, Thumb Screws, Set Screws, Custom bolts, carriage bolts, nuts, and other custom Fasteners. With more than 20years of industry experience. We have serviced over 20000customers including the aerospace industry, automotive industry, electronics, mechanical and electrical products, robots, the Medical industry, communications industry, Outdoor sports products, smart appliances, etc. we can provide one-stop fastener customized service for you no matter what kind of custom fastener you need.

Production Process

We have a variety of production requirements of equipment, can meet any customized demands. can provide comprehensive fastener solutions. Anything you need can make by Heatscrew.

Material Preparation

Threading Rolling

Automatic Lathe

CNC Process

Final Test

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