Hex Head Machine Screws (SEMS)
High-Quality SEMS Screws and Custom Automotive Hardware Solutions
Tengco specializes in hub cap bolts and SEMS screws for the automotive industry. These SEMS are hex head machine screws with pre-attached washers that reduce assembly time. SEMS can be supplied with a wide variety of washers, which can be used for locking and minimizing vibration in each application. Since the washer is already under the head, SEMS screws allow for fast installation and easy adaptation for many applications.
Tengco can make SEMS screws in a variety of sizes and head styles, including hex, hex washer, and pan head. We can also offer a full line of metric SEMS. Tengco can supply virtually any specially formed metal part required. Tengco has over 45 years of experience as a global sourcing company providing sophisticated custom cold-headed bolts, nuts, screws, and washers, along with a wide variety of custom automotive hardware.

Tengco’s Engineers Provide Innovative Solutions, Including:
- Integrated Washer Design: Pre-attached washers streamline assembly, reducing labor time and enhancing efficiency
- Wide Range of Head Styles: Available in hex, hex washer, and pan head styles to suit diverse application requirements
- Customizable Options: Available in a variety of sizes, materials, and finishes to meet specific project needs
- Enhanced Vibration Resistance: Washer components provide locking capabilities, minimizing loosening caused by vibration
- Metric and Standard Availability: Supplies both standard and metric hex head machine screws for global compatibility
- Precision Manufacturing: Strict adherence to quality standards ensures consistent performance and reliability
- Flexible Application Versatility: Ideal for use in automotive, industrial, and structural assembly processes
Comprehensive Automotive Hardware Solutions with Reliable Quality and Global Support
Whether you need hex head machine screws or other automotive parts, our PPAP documentation and approval process ensures a consistent, dependable product that exceeds expectations. Tengco can provide the quality, performance, and price customers require for their automotive hardware. We provide services for every step of the custom manufacturing process. From global sourcing to product development, fabrication, inventory tracking, warehousing, and shipping, we make sure that your order meets your exact specifications. Our line of automotive hardware includes an extensive range of fasteners and hardware.
No matter what type of automotive work a company specializes in, we can provide the essential automotive fasteners and hardware needed to stay competitive, and our global network of manufacturers and distribution points ensures flexible scheduling and the best options for shipping. Tengco's inventory management experience ensures that you maximize your inventory turns and get the right parts on time, every time.

Don't see your item? Don't see your size? We will custom manufacture automotive hardware to your exact specifications.
The Tengco Difference
Tengco is ISO 9001:2015 Certified through our Midwest location. The combination of our experienced engineers, logistics team, customer service and sales staff can help you maintain the highest standards for your custom parts.
Tengco provides world class global sourcing, service and distribution. We have the perfect solution to your global sourcing needs.
We can provide anything from standard nuts and bolts to specialty fasteners, castings, forgings and stampings.
Contact Us More ServicesStocking and Supplying with Tengco
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