Booming new energy vehicles, energy storage cabinets and PV inverters raise high standards for fastener stability and assembly speed. Separate screws and washers easily drop during automated installation, causing production delays and loose connections.
Sems Screw is an all-in-one fastener pre-fitted with flat and spring washers. It cuts assembly steps, maintains steady anti-loosening clamping force under vibration, high heat and damp environments, becoming a standard fitting for new energy manufacturing lines.
Main New Energy Application Scenarios
1. EV Battery Pack & BMS Modules
Battery brackets and insulation covers require massive fastening points. Loose discrete washers frequently halt automated locking lines.
Working Requirements
- Long-term anti-vibration against vehicle bumping
- Anti-corrosion from cooling fluid vapor
- Even pressure to prevent thin aluminum shell deformation
Matching Product
304 stainless steel cross pan head Sems Screw with double composite washers, M3/M4/M5 standard sizes for battery modules.
2. On-Board Charger & Motor Inverter
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Continuous high temperature and vibration inside inverters easily loosen split fasteners, risking poor electrical contact.
Working Requirements
- Stable performance under 110℃ constant heat
- Mini size to fit narrow PCB gaps
- Surface protection against copper foil scratches
Matching Product
Nickel-plated carbon steel countersunk head Sems Screw, thin integrated washer design for compact electrical components.
3. Outdoor Energy Storage & PV Cabinets
Outdoor cabinets face year-round wind vibration, rain and humidity, demanding strong anti-rust fasteners.
Working Requirements
- 500h salt spray corrosion resistance
- Durable locking force against periodic shaking
Matching Product
316 stainless steel hex head Sems Screw with thick washers, black zinc plating for cabinet frames and radiators.
4. EV Thermal Management System
Heat exchange plates and cooling covers bear repeated hot-cold temperature cycles. Separated washers lose elasticity quickly.
Working Requirements
- Stable preload under temperature alternation
- Coolant oil resistance
Matching Product
Lightweight aluminum alloy cross head Sems Screw, consistent clamping force after thousands of thermal cycles.
Core Advantages of Premium Sems Screw
Low-grade split screw-washer kits cause missing parts, plate indentation and equipment loose faults. Our integrated Sems Screw delivers clear strengths:
- One-piece structure eliminates washer loss, lifting assembly efficiency by over 40%
- Dual washers balance anti-loose elasticity and surface pressure dispersion
- Multiple materials: stainless steel, carbon steel, aluminum alloy for diverse working conditions
- ±0.02mm precise thread, compatible with automatic locking machines
- Custom surface treatments: zinc plating, black oxide, passivation for indoor & outdoor use
Manufacturing Strength
We have 28 years precision fastener production experience, full automatic assembly lines for customized Sems Screw.
Parameter Range
- Material: 304/316 stainless steel, Grade 8.8/10.9 carbon steel, aluminum alloy
- Thread: M1.2-M12 metric, custom non-standard pitch
- Head types: Cross pan, countersunk, hex socket
- Washer options: Single flat, single spring, flat+spring double washers
- Custom service: Laser marking, special coating, customized size
Strict Quality Control
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Automatic optical sorting machine
- Raw material spectral composition inspection
- 100% automatic optical inspection for all finished Sems Screw
- Hardness, torsion, vibration fatigue and salt spray lab tests
- Certified ISO9001, IATF16949, RoHS, REACH
Practical Application Case
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A European EV battery manufacturer switched from split screw-washer sets to our M4×12 stainless steel Sems Screw. Assembly time per unit dropped from 12s to 5s, after-sales loose failure rate reduced by 92%, and labor assembly cost cut by 18%.
Summary
Compact integrated Sems Screw solves core fastening pain points of the new energy industry. As automation standards upgrade, integrated pre-assembled fasteners will replace traditional separate fittings.
We supply standard and customized Sems Screw for sample trial and mass bulk orders.
Send inquiry to get tailored fastening solutions & samples
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Customer packaging scene
Click Here To Get Wholesale Quotation | Free Samples
Post time: Jul-14-2026
