Carbon Steel Hex Head SEMS Bolts
Hex Head SEMS Bolts are a highly efficient type of fastener combining a hexagonal head bolt with a pre-assembled washer, often used in a wide array of industrial applications for their convenience and enhanced load distribution. These bolts significantly reduce assembly time and minimize the risk of lost components, making them a preferred solution for high-volume production lines.
At Flybear Fastener, we specialize in manufacturing and supplying high-quality Hex Head SEMS Bolts that meet international standards, supported by our precise craftsmanship and robust quality systems.
Product Overview
Hex Head SEMS Bolts consist of a hex head bolt with one or more washers permanently attached. The washer is assembled under the head of the bolt during the manufacturing process and remains attached throughout the product’s lifetime, which enhances reliability and efficiency during installation. These bolts are commonly used when a consistent clamping force is necessary without the risk of losing washers.
Product Specifications
| Specification | Detail |
|---|---|
| Product Name | Hex Head SEMS Bolts |
| Washer Type | Flat Washer / Spring Lock Washer |
| Bolt Diameter | M3 – M16 |
| Length Range | 10mm – 200mm |
| Thread Type | Fully or Partially Threaded |
| Head Type | Hexagonal Head |
Technical Data
| Parameter | Value |
|---|---|
| Strength Grades | 8.8, 10.9, 12.9 |
| Surface Finish | Zinc Plated, Black Oxide, Dacromet, Nickel Plated |
| Standards | DIN 6900, ISO 4753, ANSI, GB |
| Certifications | RoHS, CE, ISO9001, IATF16949 |
Materials & Manufacturing Process
Our Hex Head SEMS Bolts are manufactured using premium materials such as:
- Stainless Steel 304/316: Excellent corrosion resistance, ideal for outdoor or marine environments.
- Carbon Steel: Popular for high-torque applications due to its strength and cost-effectiveness.
- Alloy Steel: Preferred for high-strength applications in heavy machinery and automotive industries.
Manufacturing Process Flow:
- Raw Material Selection
- Cold Heading / Hot Forging
- Thread Rolling
- Heat Treatment for Strength
- Surface Treatment (Zinc plating, Dacromet coating, etc.)
- Assembly of Washer (pre-load SEMS configuration)
- Quality Inspection
- Packaging and Delivery
Application Industries for Hex Head SEMS Bolts
Hex Head SEMS Bolts are widely utilized across multiple industries due to their convenience and performance. Typical application fields include:
Automotive Manufacturing
Used for assembling engines, seat frames, and underbody components.
Construction and Infrastructure
Ideal for steel structure frameworks requiring consistent clamping force.
Mechanical Equipment & Machinery
Used in gearboxes, motors, and automated machinery where vibration resistance and installation speed are critical.
Power & Energy
Applied in turbines, transformer units, and renewable energy platforms.
Electronics & Home Appliances
Efficient in assembling enclosures and panel components in TVs, AC units, and washing machines.
Aerospace & Telecommunications
Preferred in control panels, communication switches, and satellite components for their reliability.
Product Advantages and Competitive Edge
Our Hex Head SEMS Bolts offer unbeatable advantages which make them a smart choice for engineers and procurement professionals alike:
- High-Quality Materials: Only premium stainless steel and high-strength alloy steel ensure long-lasting performance.
- Precision Threading: Perfect thread engagement for maximum load-holding capacity.
- Corrosion Resistance: Durable surface treatments guard against wear, rust, and chemical exposure.
- Customization: Available in bulk per your specific requirements — blueprints, samples, or special surface finishes.
- Sufficient Inventory & Prompt Shipping: We maintain optimal stock levels for faster dispatch.
Inspection and Quality Control
At Flybear Fastener, quality is not an afterthought — it’s a commitment. Our comprehensive testing and inspection processes ensure that every Hex Head SEMS Bolt meets the highest industry standards:
- Thread Gauges to confirm dimensional accuracy
- Salt Spray Testing to verify surface corrosion resistance
- Tensile Strength Testing under real-world load conditions
- 100% random sampling and inspection before packaging
- Fully certified quality management systems including ISO 9001 and IATF 16949
Conclusion
We always uphold the principle of “quality first, customer foremost” and are dedicated to offering our clients high-grade fastener products and comprehensive one-stop solutions tailored to their industry needs. Whether you’re in automotive, construction, or high-tech manufacturing, our team is ready to assist. Please don’t hesitate to contact us for customized industry solutions and quotations.
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