3.5mm Snap Electrodes | Stainless Steel Stud | TOP-RANK OEM
Technical specifications for 3.5mm snap-on electrodes. Focus on stud retention force, carbon ink gradient dispersion, and hydrogel shear modulus under EMS load.
Product Overview
These are stud-based electrodes for EMS and TENS units using a 3.5mm button interface. The design eliminates pigtail lead wires. The engineering focus is on the mechanical bond between the metal stud and the conductive substrate, and the subsequent current distribution from a single point-source across the pad surface.
Key Features
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Stud Retention and Flange Anchoring
In snap designs, the stud is the primary mechanical failure point. We use an oversized 10mm internal flange that is ultrasonic-welded to the carbon film. This mechanical interlock prevents the stud from pulling through the non-woven backing during high-force disconnection cycles.
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Current Gradient Management
A metal snap creates a point-source for current, which causes "hot spots" directly under the stud. The carbon ink is printed with a variable density gradient-thicker at the center and tapering toward the edges. This forces the electrical load to spread across the 2500 sq. mm surface rather than concentrating at the snap entry point.
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Hydrogel Shear Modulus (EMS Load)
EMS protocols involve high-intensity muscle shortening that physically shifts the pad. We use a hydrogel with a high cross-linking density to increase its shear modulus. The adhesive polymer chains resist sliding under the mechanical tension of a contracting muscle.
Applications
High-Intensity EMS
Targeted muscle re-education and explosive strength training.
Mobile Pain Relief
Wearable TENS devices where pigtail wires would snag on clothing.
Clinical Sports Rehab
Fast-application recovery sessions for multiple athletes.
OEM & Private Label
We operate manufacturing nodes in China and Vietnam to bypass Section 301 tariffs and optimize logistics.
- Branding: Pad-side logo printing and custom-colored non-woven backings.
- Packaging: 2-pad or 4-pad configurations in resealable aluminum foil pouches with custom EAN/UPC barcodes.
Certifications
- Regulatory: FDA 510(k), CE (MDR), UKCA.
- Systems: ISO 13485 and MDSAP.
- QC: 100% visual inspection for stud alignment and lot-testing for stud-to-film impedance stability.
FAQ
Q: Why do the snaps sometimes develop green oxidation?
A: This occurs when the pad is stored in a high-humidity environment or if the hydrogel is too acidic. We use nickel-plated stainless steel to resist corrosion, but storing pads in a sealed pouch between sessions is a mechanical requirement to prevent electrolyte-driven oxidation.
Q: Can these pads handle 100mA EMS pulses?
A: Yes. The carbon film thickness is calibrated for high-current loads. However, if the snap becomes loose, the internal resistance increases, which can trigger an "open circuit" alarm on the stimulator.
CTA
B2B procurement teams can request technical data on stud pull-force and impedance stability.
👉 [Request Samples for Pull-Force Testing]
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Specifications
| ITEM | SHAPE | SIZE(CM) | PACKAGING |
|
40*40 |
Square |
4.0*4.0 |
4pcs/pack |
|
50*50 |
Square |
5.0*5.0 |
4pcs/pack |
|
45*95 |
Butterfly |
4.5*9.5 |
2pcs/pack |
|
30*50 |
Tab |
3.0*5.0 |
4pcs/pack |
|
50*90 |
Tab |
5.0*9.0 |
2pcs/pack |
