What This Collection Delivers: Contact Force Stability at 0.5N to 5N The Touch Screen Spring Contacts Collection is a family of custom-engineered springs designed for capacitive a
Touch Screen Spring Contacts Collection | Custom Precision Springs by BQUQ
What This Collection Delivers: Contact Force Stability at 0.5N to 5N The Touch Screen Spring Contacts Collection is a family of custom-engineered springs designed for capacitive and resistive touch i
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What This Collection Delivers: Contact Force Stability at 0.5N to 5N
The Touch Screen Spring Contacts Collection is a family of custom-engineered springs designed for capacitive and resistive touch interfaces. These are not off-the-shelf coils; each spring is manufactured to your exact load curve, with a tolerance of ±0.01mm on outer diameter and ±0.5% on force. We achieve this through a combination of CNC machining for critical seating surfaces and high-speed stamping for body geometry, resulting in a maximum runout of 0.02mm TIR. For most touch screen assemblies, this means a consistent actuation force across the entire panel – no dead zones, no premature wear. With a lead time of 5 working days for prototypes and 10 days for production runs, you can keep your development cycle moving without waiting on overseas suppliers.
How We Control Contact Force Consistency Across Millions of Cycles
Touch screens demand springs that do not fatigue. A spring that loses 10% of its force after 100,000 presses will cause false touches or missed inputs. Our Touch Screen Spring Contacts Collection uses two methods to prevent this. First, we stress-relieve every spring after forming, reducing residual stress by up to 30%. Second, we set the springs to solid height during manufacturing, which pre-conditions the material for its working range. The result is a load drop of less than 3% after 1,000,000 cycles at full deflection. We verify this on a computer-controlled compression tester, sampling every 500th piece from the production line. If you need a specific cycle life, we will adjust the material grade and wire diameter to match your requirement.
Materials and Heat Treatment: From 304 Stainless to Beryllium Copper
We stock six material grades specifically for touch screen contacts. The most common is SUS304-2B stainless steel, which offers good corrosion resistance and a hardness of 380-420 HV after work hardening. For applications requiring higher conductivity, we use beryllium copper C17200, heat-treated to 36-42 HRC, delivering a conductivity of 22% IACS. In environments with high humidity, we recommend 17-7PH stainless, which reaches 44-48 HRC after precipitation hardening. For every batch, we include a material certificate from the mill, and we perform a hardness test on each coil before it enters the forming machine. We do not mix materials between orders – a common failure point in low-cost factories.
Surface Finish and Edge Conditioning: Why Ra 0.4μm Matters
A rough spring surface creates micro-fretting on the contact pad, leading to intermittent signals. We grind and polish the seating surfaces of every spring in this collection to Ra 0.4μm or better, and we deburr all edges to a radius of 0.05mm minimum. This is not cosmetic. It reduces the coefficient of friction against the PCB pad, ensuring that the spring does not scratch the gold-plated surface during assembly or use. We also offer a passivation treatment (ASTM A967) to remove free iron and enhance corrosion resistance. If your design uses a pogo-pin style contact, we can add a pointed or crowned tip, which is CNC machined to a concentricity of 0.01mm with the spring axis.
Inspection Before Every Shipment: Force, Height, and Runout on 100% of Parts
You will not receive a batch with hidden defects. Every spring in the Touch Screen Spring Contacts Collection is inspected using a 2.5D optical measuring machine and a digital force tester. We check free height, solid height, outer diameter, and load at 20%, 50%, and 80% of travel. Runout is measured against a precision mandrel, and any part exceeding 0.02mm TIR is rejected. Our quality system is ISO 9001 and IATF 16949 certified, and we provide a full inspection report (FAI) with your first article. For production batches, we use statistical process control (SPC) and include a CPK value of 1.33 or higher on critical dimensions. You can see the actual data, not just a 'passed' stamp.
How to Specify Your Spring: Key Dimensions We Need from Your Drawing
To quote your custom spring within 12 hours, send a drawing with these five dimensions: wire diameter (mm), outer diameter (mm), free length (mm), total coils, and required load at working height. If you do not have a drawing, send the mating PCB and cover geometry – we will design the spring for you. We work with both metric and imperial units. For a typical touch screen spring, we recommend a wire diameter between 0.1mm and 0.5mm, and a free length from 1.5mm to 8mm. If your application requires a low profile, we also offer flat spiral springs (constant force) which fit in a 1.2mm cavity. Our engineers will suggest a material and finish based on your environmental test requirements.
Pricing, MOQ, and Why We Do Not Charge Tooling Fees
The Touch Screen Spring Contacts Collection has no minimum order quantity. You can order 100 pieces for a prototype test or 1,000,000 pieces for mass production – the unit price will scale accordingly. Tooling fees are waived for orders above 50,000 pieces; for smaller runs, a simple forming die costs between $150 and $400, which is fully credited back after 100,000 pieces are ordered. We keep our costs low because we are a vertical factory: we draw our own wire from rod stock, which reduces material waste by 15% compared to buying pre-drawn wire. This is why our made in China pricing is typically 20-30% lower than equivalent Japanese or German suppliers, without sacrificing tolerance or finish.
Specification
Value / Range
Notes
Materials
SUS304, 17-7PH, C17200 BeCu, SUS316L, Spring Steel 65Mn
Material cert included with every batch
Wire Diameter
0.10 mm – 0.80 mm
Tolerance ±0.005 mm
Outer Diameter
1.0 mm – 12.0 mm
Tolerance ±0.01 mm
Free Length
1.5 mm – 20 mm
Tolerance ±0.05 mm
Hardness (Stainless)
380 – 480 HV
After work hardening
Hardness (BeCu)
36 – 42 HRC
After heat treatment
Surface Finish (Seat)
Ra 0.4 μm max
Ground and polished
Runout (TIR)
0.02 mm max
Measured on mandrel
Load Tolerance
±0.5% at specified height
Verified at 3 points of travel
Cycle Life
1,000,000 cycles (min)
Load drop <3% at full deflection
Lead Time (Prototype)
5 working days
Expedite available
Lead Time (Production)
10-15 working days
Based on quantity
MOQ
No MOQ
Prototype orders accepted
Why Precision Manufacturing of These Springs Requires a Dedicated Machine Setup
Do not let a general spring shop quote your touch screen contact. This product requires a CNC spring coiler with a servo-driven wire feeder and an in-line laser gauge. We operate 12 such machines, each dedicated to a specific wire diameter range. This avoids contamination between materials and ensures that the wire tension is constant – a variable that can change the spring index by 5% if uncontrolled. After coiling, we use a centerless grinder on the end coils to create a flat seating plane, which is what keeps the spring perpendicular to the PCB. Runout is measured on every part using this setup. If you want to understand how tooling selection affects the final part, read our CNC cutting tool selection guide for background on precision cutting and finishing.
Designing for Your Assembly: How We Integrate with Pogo Pins and FPC Connectors
Our Touch Screen Spring Contacts Collection is not limited to bare coils. We can integrate your spring with a plunger and barrel to form a complete pogo pin assembly, or weld a spring to a stamped contact pad for an FPC connector. For pogo pins, we CNC machine the plunger from brass or steel, plate it with gold over nickel (0.4μm gold on 2μm nickel), and assemble the spring inside the barrel. The plunger travel is controlled to 0.3mm with a contact resistance of less than 20mΩ. For FPC connectors, we use a laser welding process that does not distort the spring's temper. If your design uses a standard spring, we still recommend a small chamfer on the PCB pad to guide the spring into position. For more on how our tolerances stack up, see our CNC machining tolerances guide.
What is the minimum order quantity for this collection?
There is no MOQ. You can order a single prototype spring for testing, and we will not charge a special handling fee.
Can you customize the spring shape and force curve?
Yes, every spring is made to your drawing; we can produce conical, barrel, or hourglass shapes, and we will tune the load curve to your exact specification.
How do you ensure quality for large production runs?
We perform 100% inspection on critical dimensions using automated optical and force testing, and we provide a CPK report with every batch.
What is the standard lead time for a production order?
Prototype parts ship in 5 working days, and production orders of up to 500,000 pieces ship in 10-15 working days after drawing approval.
Get a Firm Quote Within 12 Hours – Send Your Drawing Today
Send us your 2D drawing or 3D model in STEP or IGES format. Our engineers will review the design for manufacturability and return a firm quote, including unit price, tooling cost (if any), and the exact lead time. We will also suggest an alternative material if our standard stock offers a better cost-to-performance ratio. For the Touch Screen Spring Contacts Collection, we can send you free samples of standard sizes within 3 days. This is a direct factory offer – we do not use trading companies, so you get the best price and direct communication with the production team. Email your drawing to sc@bquq.com or message us on WhatsApp at +86 13713157787. We are online 24/7 and will respond within 12 hours.
