BL-Series-4L-Tactile Metal Domes

BL-Series 4-Lead Tactile Metal Domes with Center Hole

Shanyo's BL-Series represents our premium 4-lead tactile metal domes with central hole, purpose-built for backlit membrane switches and automotive control panels where both reliable tactile feedback and uniform LED illumination are required. The four precision-formed legs provide stable PCB mounting, while the center hole enables direct LED placement behind the dome switch, significantly enhancing lighting intensity and uniformity.

Manufactured under IATF 16949 automotive quality management standards, every BL-Series dome is produced in our Qingdao facility with in-house tooling, stamping, plating, and inspection - ensuring tight tolerances, consistent force curves, and full lot traceability from raw material to finished product.

These four-legged tactile domes return to rest quickly after actuation, maintaining the same crisp click feel across millions of cycles. The geometry is optimized for membrane switch overlays, PCB-mounted keypads, and pre-assembled dome array sheets commonly used in vehicle interiors and industrial HMI systems.

Key Advantages of BL-Series 4-Lead Design

Center Hole for Backlighting: The precisely punched central hole allows LEDs to shine directly through the dome, delivering bright, even illumination across the keycap without the light loss associated with non-perforated domes.

Four-Leg Mounting Stability: Four formed legs rest on the PCB pads, providing excellent positional stability during reflow soldering and preventing dome shifting under vibration - critical for automotive and industrial applications.

Crisp, Consistent Tactile Feedback: Precision-stamped SUS301 stainless steel delivers a uniform snap action with high tactile ratio, reducing operator fatigue and improving input accuracy in high-frequency use.

Long Service Life: Engineered for 1,000,000+ actuation cycles under normal conditions, with premium grades available up to 5,000,000 cycles for mission-critical applications.

Automotive-Grade Quality: IATF 16949 certified production process with 100% force curve inspection on critical orders, ensuring batch-to-batch consistency that automotive Tier-1 suppliers demand.

Technical Specifications

Typical Applications

BL-Series 4-lead tactile domes are the preferred choice for applications requiring both tactile feedback and illuminated key indication:

• Automotive Interiors: Steering wheel multi-function switches, center stack buttons, climate control panels, seat memory switches, window controls
• Backlit Keypads: Industrial HMI panels, medical device keypads, marine control systems, aviation cockpit controls
• Consumer Electronics: TV remote controls, home appliance control panels, audio equipment, smart home devices
• Medical Devices: Patient monitors, infusion pumps, diagnostic equipment requiring clean, illuminated key surfaces
• Industrial Equipment: CNC machine controls, factory automation interfaces, test & measurement instruments
• Communication Systems: VoIP phones, intercom systems, walkie-talkie keypads

Customization & Engineering Support

Our engineering team works closely with customers to tailor BL-Series domes to specific application requirements:

✅ Dome Geometry Tuning: Custom diameter, height, leg length, and center hole size optimized for your overlay thickness and LED package.

✅ Force Profile Optimization: Actuation force precisely matched to your ergonomic requirements, from ultra-light touch to heavy-duty industrial switches.

✅ Surface & Contact Options: Nickel, gold, or silver plating for optimal contact resistance and corrosion resistance in your operating environment.

✅ Dome Array Assembly: Pre-assembled dome array sheets with PSA backing, precision-aligned for high-volume membrane switch production.

✅ Full Documentation: PPAP Level 3, IMDS submission, material certificates, and detailed test reports for automotive and medical customers.

Quality Assurance & Automotive Compliance

BL-Series domes are manufactured under IATF 16949 quality management system, with a comprehensive inspection protocol covering every production lot:

• 100% actuation force testing with SPC statistical process control
• Dimensional verification using optical measuring instruments
• Life cycle testing to verified specifications
• Contact resistance and insulation resistance checks
• Salt spray corrosion testing (48-96 hours)
• Temperature-humidity cycling and thermal shock testing
• Vibration and mechanical shock resistance validation

Be Used in a Wide Range of Industries

Automotive Interior

Consumer Electronics

Medical Devices

Industrial Controls

Aerospace & Defense

Telecommunication