Factory Direct Hex Head Metric Stainless Steel Terminal Double Sems Screws
What Are These?
These are integrated sems screws pre-assembled with flat washer and spring washer as one piece, eliminating separate washer assembly during production. Our core styles cover hex head sems screws and special terminal sems screws for electrical wiring blocks. Double sems structure with two washers is offered for stronger anti-loosening performance.
The complete uniform thread along the shank matches tapped holes and standard nuts perfectly. Vibration resistant captive sems screw designs lock tightly under long-term mechanical shaking to avoid loose connections. Clients also call them washer assembly screws, pre-assembled sems screws, three combination machine screws, all referring to our same product series.
1 Materials We Offer
We supply multiple base materials to match different working environments.
Stainless Steel 304
Our mainstream stock material. Excellent rust resistance, suitable for indoor electrical cabinets, common automation equipment and general outdoor installation projects.
Stainless Steel 316
Premium anti-corrosion grade with molybdenum element, great for coastal salt mist, chemical workshop and high humidity harsh working conditions.
Carbon Steel
Cost-effective high strength option with 4.8/8.8 grade standards. Plain carbon steel easily oxidizes, so we provide diversified surface treatments: blue white zinc, color zinc, black zinc, black oxide, nickel plating to extend service life.
Sizes Available
Complete metric size range, custom non-standard sizes supported upon your demand.
Metric Diameters & Lengths Metric diameters: M1.4, M2, M2.5, M3, M3.5, M4, M5, M6, M8, M10. Standard lengths from 3mm to 80mm, extra long or ultra-short lengths can be customized.
Thread Standards Thread standard follows DIN, ISO, JIS norms, coarse thread as stock, fine thread available for customized orders.
Extra Optional Styles Beyond hex head & terminal head, we provide cross pan head, torx head, wafer head sems screws; single sems, double sems, triple sems washer combinations. Anti-vibration captive locking structure is specially designed for frequently shaking equipment.
Standard Specs
DIN 9074, ISO standard integrated sems machine screw norms, fully interchangeable with mainstream brand fasteners.
Typical Uses
Our sems screws are widely adopted across multiple mainstream industries.
Electrical & Electronics Terminal block wiring, power supply housings, control panel assembly, PCB module fixing, electrical connector installation. Integrated washers avoid missing accessories during mass assembly.
Automotive Accessories Car interior plastic trim, vehicle control modules, new energy battery components. Vibration resistant sems screws prevent loosening during long-distance driving.
Industrial Automation Conveyor equipment, servo motor brackets, machine tool housings, production line equipment covers. High strength carbon steel sems screws bear heavy mechanical loads.
5G Communication Communication cabinet frames, base station internal fixing, outdoor signal equipment. 304/316 stainless steel resists outdoor wind and moisture erosion.
Home Appliances Air conditioners, water heaters, washing machine internal components, small household appliance shell assembly.
Construction Hardware Low-voltage distribution boxes, electrical switch panel installation, equipment metal bracket fixing.
PRODUCT APPLICATION
Widely applied to electrical power, new energy vehicles, 5G communications, consumer electronics, industrial machinery, aerospace auxiliary equipment, intelligent automation equipment
Other Related Items
If you need matched supporting fasteners, we provide one-stop supporting hardware. Separate nuts, flat washers, spring lock washers, self tapping screws, captive screws, thread forming screws, security tamper proof screws.
Full custom service supported: special washer thickness, exclusive head shape, custom thread pitch, customized surface coating, personalized packaging, laser marking logo. Just send your technical drawings or detailed parameter requirements, we will offer accurate quotation and free samples.
About Our Factory
We are a professional China sems screws manufacturer with more than 30 years fastener production experience, owning two standardized production bases with total area over 20,000 square meters. Main products include all types of sems screws, machine screws, self tapping screws and customized special fasteners.
Equipped with full automatic cold heading machines, thread rolling equipment and independent complete surface treatment production lines. We independently develop molds to shorten sample lead time for OEM custom orders. All finished goods pass torsion, tension and salt spray testing before delivery.
Our cooperative clients spread all over North America, Europe, Southeast Asia and Middle East. We serve electronics, auto parts, communication, machinery, construction and furniture industries. Our factory is ISO 9001 certified, all standard fasteners comply with RoHS and REACH environmental standards.
We accept all batch orders: small prototype trial orders of several hundred pieces, mass bulk orders and full container shipments. Standard stock sems screws have no strict MOQ, custom orders can adjust minimum quantity flexibly according to your demands.
How to Order
Want to get accurate quotation and free samples? Send us inquiry with below information:
- Screw specification: thread diameter, total length, head type
- Raw material and surface finishing requirement
- Order quantity
- Extra special demands: anti-vibration captive structure, packaging, certification, custom logo etc.
Our sales team will reply with detailed price list and production lead time within 12 working hours.Sample service available: free samples for quality inspection, customers only bear the shipping cost.Feel free to contact us anytime for all kinds of sems screw and fastener matching solutions.
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