Sems Screws Pre Assembled Washer Screws For Industrial Assembly

SEMS combination screws are integrated one‑piece fasteners with freely rotating captive washers locked under screw heads. During thread‑rolling production, washers are trapped permanently so they will not drop off in storage, transit or automated feeding. SEMS combination screws eliminate manual work to match separate screws and loose washers. Only one single component needs handling, which greatly simplifies workflow for both manual workshops and high‑speed robot‑driven assembly lines. Manufactured following DIN, ISO, ANSI and JIS standards, these fasteners cover metric M1.6‑M12 and imperial sizes to fit miniature electronics up to medium‑duty mechanical assembly.

Available Head, Drive And Washer Configurations

We supply diverse configurations for SEMS combination screws to match different fastening scenarios. Head options contain pan head, truss head, hex indented washer head and socket cap head. Drive choices include Phillips, Torx, slotted and hex socket for different tooling conditions. Washer combinations support single flat washer, single spring lock washer, double flat‑spring washer, external serrated anti‑loose washer. Customers can select proper washer sets according to load stress and vibration intensity.

Material Grade And Surface Finish Options

SEMS combination screws are produced in SUS304, SUS316 stainless steel and multiple grades of heat‑treated carbon steel. Stainless steel delivers reliable anti‑corrosion property for coastal, damp and outdoor operating environments. High‑strength carbon steel provides powerful clamping performance for cost‑sensitive indoor mechanical assembly. Available surface treatments cover zinc plating, nickel plating, black oxide and passivation. Anti‑loose pre‑coating can be applied upon request to improve joint stability under continuous vibration.

Quality Assurance

Raw material incoming inspection checks chemical composition and mechanical hardness before production. Thread‑rolling and heading processes keep tight dimensional tolerance. Finished batches go through sampling tests including dimension check, washer retention strength, hardness and torque verification. Standard‑range SEMS combination screws meet RoHS compliance for global export electronics and machinery. We accept small‑batch trial orders and large‑volume mass‑production. Pre‑production sample confirmation is required for every custom project before bulk shipment.

Main Application Industries

SEMS combination screws are widely adopted across multiple industrial sectors. Consumer electronics chassis, PCB mounting and internal component fixing. Household appliances, power adapters and electrical control boxes. Telecommunication cabinets, server racks and distribution panels. Sheet‑metal fabrication, equipment brackets and modular cabinet structures. Automotive interior parts and new‑energy device assemblies. General machinery, motor bases and light‑duty fixture installation.

Company Introduction

We are a specialized industrial fastener manufacturer focusing on standard and non‑standard SEMS combination screws and other threaded fastener products. Our complete production workshop covers heading, thread rolling, secondary CNC processing and surface‑treatment workshops. We have accumulated rich custom‑development experience serving global buyers from electronics, automotive, new‑energy and mechanical equipment industries. Our engineering team offers drawing evaluation, sample development and full‑cycle technical follow‑up for custom fastener demands.

Contact Us For Technical Advice And Quotation

If you are sourcing qualified SEMS combination screws for your assembly project, please share your drawings, dimension parameters, washer requirements and working‑condition information. Our technical team will recommend suitable material and surface‑finish solutions and deliver competitive factory‑direct quotation.

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