A thick phone case increases the distance between the phone and the magnetic holder, and that air gap can reduce holding performance. The practical answer is not to promise that one holder fits every thick case. Test the complete assembly: phone, case, holder and the mount the customer will use. OX-3 is published at 58 × 4.5 mm and 25 g, with an N52 magnet assembly measured at about 4,100 GS on the finished product.
Who should consider a double-sided holder?
A double-sided holder is intended for markets where protective or thicker cases are common, or where the phone assembly needs a magnetic outer surface. It is not proof that every case is suitable. Material, coating, folds, metal inserts and cards can change the result. Test cases that represent the sales range, not one convenient exception.
- Use the phones most likely to be sold with the holder.
- Use the intended case materials and thicknesses.
- Record the back texture and any metal or card accessory.
- Test the actual mount, plate or stand.
What changes when the holder is double-sided?
A conventional single-face accessory depends on one magnetic interface. OX-3 places magnets on both faces: one addresses the phone or case, and the other provides the mounting face. Test the two interfaces separately instead of treating the product as one undifferentiated magnetic claim.
| Test area | What to test | What to record |
|---|---|---|
| Case interface | Placement, movement and stability against the actual case | Phone model, case material, surface and test result |
| Outer magnetic face | Attachment to the intended mount or stand | Mount type, orientation and whether movement occurs |
| Product fit | Body position, ring or kickstand clearance and camera clearance | Photos from front, side and back |
| Finish and markings | Colour, surface and logo against the approved references | Sealed reference and close-up photos |
A seven-step thick-case fit test
A useful screening test needs a defined procedure and one responsible approver. Use the same phone, case and mount for every repetition.
- Record the case material, texture and measured thickness.
- Install the holder and wait for the adhesive to reach its specified strength.
- Check placement, camera clearance and control clearance.
- Test the outer face at several realistic mounting angles.
- Observe creep, rotation or separation under the intended load.
- Photograph each interface and write one pass or fail result.
Do not turn the result into a universal compatibility statement. Identify the tested phone and case, state that the outer face is magnetic, and ask the customer to verify any changed combination. Repeat the test for materially different case constructions, not several colours of the same shell.
What belongs in the approval record?
The signed record must let another reviewer reproduce the test. Identify the holder version, phone, case, mount, load method and failure condition. A photo without a written result does not show whether movement was acceptable or the moment before separation.
- OX-3 version and date code.
- Measured dimensions and weight.
- Phone and case details.
- Mount model and tested angles.
- Separate pass or fail results.
- Photos and approver name or role.
OX-3 starts from the published 58 × 4.5 mm, 25 g and approximately 4,100 GS. These values do not prove performance with a specific case. Re-measure the sample and store the result. See the <a href="../facts">verifiable facts page</a> for scope and the <a href="../blog/magnetic-phone-holder-sample-approval">sample approval guide</a> for the wider sign-off process.
OX-3, CX-5 or a case program?
Start with the <a href="../products/ox3">OX-3 product page</a> for the double-sided format and the <a href="../products/cx5">CX-5 page</a> for the thinner single-face format. An integrated ring case is a different development project. Review the <a href="../blog/double-sided-vs-single-sided-magnetic-holders">double-sided versus single-sided guide</a> before sampling.
Choose by the market's cases, not one blanket thickness claim. Send the same phone with representative TPU, hard plastic, leather or PU cases when those are the intended sales surfaces. Different colours made on the same shell count as one construction test.
What to send before sampling
Send the product reference, target market, quantity estimate and the actual phone and case. Include the logo, finish and packaging plan so colour and identification are checked with the fit test.
- Holder model or reference.
- Phone and actual case.
- Case material and surface.
- Mount or stand.
- Quantity and market.
- Logo, finish and packaging.
- Delivery date and test method.
Ready-molded models start at 50 pcs per model. Sampling takes 7–10 working days after requirements are confirmed; production takes 7–12 days after approval, followed by 3–5 days for packing and final inspection, FOB Shenzhen. Start with the <a href="../answers">buyer answer library</a>, then send the actual fit-test set.
Need a price for your own model?
Send us your drawing or a reference photo. You will get unit price, sampling time and shipping cost within one working day.
Frequently asked questions
Does OX-3 fit every thick phone case?
No blanket compatibility claim should be made. OX-3 has magnets on both faces, but the buyer must test the actual phone, case and mount. Case material, surface, construction and accessories can change the result.
What does double-sided mean on OX-3?
One magnetic face addresses the phone or case, while the outer face provides a magnetic mounting surface. Both interfaces should be tested and recorded separately.
Does case thickness affect magnetic holding?
Thickness changes the distance or air gap in the magnetic path and can reduce holding performance. Test the exact case rather than relying on a single thickness number or a generic compatibility claim.
What should the buyer send for a thick-case sample test?
Send the holder model, actual phone, actual case, intended mount, target quantity and market, logo or packaging plan and required delivery date. Record the case material, texture and thickness.
What are the MOQ and lead times?
Ready-molded models start at 50 pcs per model. Sampling takes 7-10 working days after requirements are confirmed; production takes 7-12 days after sample approval, followed by 3-5 days for packing and final inspection, FOB Shenzhen.
Models mentioned in this guide