Sems Screw
As a highly specialized fastening component, our sems screw (featuring pre-assembled flat and spring washers) represents the pinnacle of assembly-line efficiency and vibration resistance. By combining the screw and washers into a single, permanent unit before the thread-rolling process, we eliminate the need for workers to manually place washers, thereby cutting assembly times in half and preventing missing parts.
As a highly specialized fastening component, our sems screw (featuring pre-assembled flat and spring washers) represents the pinnacle of assembly-line efficiency and vibration resistance. By combining the screw and washers into a single, permanent unit before the thread-rolling process, we eliminate the need for workers to manually place washers, thereby cutting assembly times in half and preventing missing parts. Over our 14 years of production history, we have optimized our sems screw manufacturing lines to ensure that washers remain fully captive without jamming or sliding off. Our factory supplies these high-precision assemblies to major listed corporations in the automotive electronics, smart device, and heavy machinery industries, maintaining a daily capacity of over 1 million pieces to meet large-scale demand.
Purchasing the sems screw directly from our source factory allows you to bypass trading company markups while gaining full access to custom engineering and R&D support. We operate under a highly successful dual-location business model, combining a low-cost production plant in Jiangxi with an agile sales and logistics hub in Hangzhou. We take full responsibility for our product quality, offering a 1-year warranty and immediately replacing or refunding any items damaged during transit. We support a standard production cycle of 15 to 20 days and offer faster lead times for repeat orders to keep your inventory lean. Reach out to our customer service team today to obtain a free sample set of our high-quality captive washer screws.
Technical Specifications
| Material | Carbon Steel (Grade 4.8, 8.8), Stainless Steel (SUS304) |
| Assembly Configuration | Screw + Flat Washer + Spring Split Washer (Three-piece assembly) |
| Standards | DIN 6900, ISO 10644 |
| Thread Range | M2 to M8 (Metric) |
| Surface Finish | Zinc Plated (Clear/Yellow/Black), Nickel Plated, Passivated |
Applications
Automotive engine wire harnesses and dashboard electronics
Printed circuit board terminal blocks and smart home devices
Industrial machinery panels and equipment under constant vibration
Factory Strength
Established in 2013, our production base features advanced automated cold headers and thread assembly machinery with a monthly capacity of 200 tons. We have continuous partnerships with listed companies, state-owned enterprises, and overseas brand importers.
Quality Control
Our quality system is ISO9001 certified. We conduct strict raw material inspections, monitoring steel wire hardness and dimensional tolerances. We perform rigorous captive washer slip checks and vibration testing to ensure every sems screw performs reliably under high vibration.
After-Sales Service
We have a dedicated customer service team to handle post-delivery inquiries. We provide a 1-year product warranty on all fasteners. In the rare event of transit damage or quality issues, we will quickly handle replacements or refunds.
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