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What Are Sems Screws?
Sems Screw (or Sem Screw) is a pre-assembled fastener with captive washers, streamlining assembly and reducing FOD risks. Product range covers Stainless Steel Sems Screws, Phillips Sems Screws, Hex Sems Screws, Sems Machine Screws, and Sems Socket Head Cap Screws.
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Two Production Bases & Full-Auto Workshops
8,000㎡ in Dongguan & 12,000㎡ in Lechang. Full-auto workshops cover screw, washer, lathe, nut, and stamping processes — producing M1-M22 sems screws and custom parts.
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Global Trust & Certifications
Certified ISO9001, ISO14001, IATF16949 and recognized as a High-Tech Enterprise. Products meet REACH/ROHS standards, exported to 40+ countries, and trusted by Xiaomi, Huawei, and SONY.
Sems Screw (or Sem Screw) is a pre-assembled fastener with captive washers, streamlining assembly and reducing FOD risks. Our product range covers Stainless Steel Sems Screws (corrosion-resistant for harsh environments), Phillips Sems Screws (easy torque application), hex sems screw (heavy-duty strength), sems machine screw and sems machine screws (precision for machinery), and sems socket head cap screw (high-torque scenarios like PCB fixing).
With two production bases (8,000㎡ in Dongguan, 12,000㎡ in Lechang) and full-auto workshops (screw, washer, lathe, nut, stamping), we produce M1-M22 sems screws and custom parts. Strict quality control includes 10+ optical sorters (600pcs/min inspection), full visual inspection, and a lab with hardness testers, torque meters, tensile machines, and X-ray fluorescence spectrometers (for eco-testing), ensuring 100% defect-free products.
Certified ISO9001, ISO14001, IATF16949 and recognized as a High-Tech Enterprise, our products meet REACH/ROHS standards, exported to 40+ countries and trusted by Xiaomi, Huawei, SONY. We offer one-stop solutions, pre-sales R&D, and after-sales support. Choose our sems screws—backed by mature supply chains and professional teams—to cut assembly time, reduce errors, and exceed your quality expectations.
Frequently Asked Questions
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What is a Sems Screw and how does it differ from a standard screw?
A Sems Screw is a pre-assembled fastener that combines a screw with one or more captive washers. Unlike standard screws, the washer is permanently retained on the screw shank before installation, which speeds up assembly, reduces the risk of dropped parts (FOD), and ensures consistent clamping force every time.
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What size range of sems screws can you manufacture?
We are capable of producing sems screws in the range of M1 to M22, nuts from M2 to M16, and various types of gaskets. Custom sizes beyond standard ranges can also be discussed based on your specific project requirements.
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What surface treatment options are available for your sems screws?
We offer a wide range of surface treatments to meet different environmental and aesthetic requirements, including zinc plating, nickel plating, black oxide, phosphate coating, hot-dip galvanizing, and more. All surface treatments comply with REACH and ROHS environmental standards.
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What quality certifications does your company hold?
Our company is certified to ISO9001 (Quality Management), ISO14001 (Environmental Management), and IATF16949 (Automotive Quality Management). We are also recognized as a High-Tech Enterprise, and all products meet REACH and ROHS compliance requirements.
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Do you support OEM and custom orders for sems screws?
Yes, we fully support OEM and custom manufacturing. Customers can specify head style, drive type, thread size, material, surface treatment, and washer configuration. Our R&D team provides pre-sales technical consultation to help you design the ideal fastener solution for your application.
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Which industries and brands use your sems screw products?
Our sems screws are widely used across electronics, automotive, telecommunications, and consumer appliances industries. We are a trusted supplier to globally recognized brands including Xiaomi, Huawei, and SONY, and our products have been exported to over 40 countries worldwide.
