Watches, glasses, handbags, mobile phones… all these objects are subjected to vibrations and shocks which “naturally” lead to the loosening of micro-screw assemblies.
To replace the traditional application of liquid threadlocker, in the 1980s we developed pre-coating processes adapted to micro-screws from S0.7 to M2. The technique was then extended to shafts and other threaded parts.
Today, our expertise is recognised by the world’s leading luxury brands. Every year, we process millions of parts for major watchmakers, eyewear manufacturers, luxury leather goods manufacturers and jewellers.
Our pre-coating techniques and applications
Pre-coating effectively replaces traditional mechanical locking techniques and liquid threadlocker bonding.
We use different processes to treat all types of screws, as well as headless or thin-headed pins.
Our equipment is suitable for S0.7 M2 parts.
The length and thickness of the coating are determined for each application according to the parameters of the assembly: number of engaged threads, clearance in the assembly, quality of the threads, material of the parts, etc.
For technical validation of our solution, we supply sample batches for testing by the customer. We can also carry out torque measurements on customer assemblies.
Special services and packaging
All parts are checked on entry: we carry out a batch count and a visual check.
The parts are treated and dried so that the patch is dry to the touch. They are then vacuum-packed.
We use different processes to handle all types of screws, as well as headless or thin-headed pins.
For fragile parts or parts with special surfaces, we carry out individual treatments.
The parts received in the tray are treated one by one with pliers and individually checked by the operator.
A bagging service in small, economical batches is also available.
Product specifications
Features
| H Lock 2510 | H Lock 2353 | H Lock Polyamide | |
| Color | Orange | Blue | Green |
| Type | Microencapsulated adhesive | Microencapsulated adhesive | Polyamide resin |
| Function | Strong locking and sealing | Standard locking | Reusable locking |
| Standard coating length | 5 to 6 threads | 5 to 6 threads | 4 to 6 threads |
| Curing time at 20°C | 5 days | 3 days | Instant effect |
| Number of uses | 1 (2 uses in some cases) | 1 (2 uses in some cases) | 5 |
| Braking torque on screwing | Low | Low | Medium |
| Release torque | High | High | Medium |
| Vibration resistance | Excellent | Excellent | Good |
| Shock resistance | Excellent | Excellent | Good |
| Chemical resistance | Good | Good | Good |
| Guaranteed watertight (oil, UV, grease) | Yes | Yes | Yes |
Comparison of different solutions for assembling watch screws
| H Lock 2510 & 2353 | H Lock Polyamide | Thin elastomers | Liquid threadlockers | |
| Easy assembly | ⭐⭐⭐ | ⭐⭐ | ⭐ | ⭐ |
| Shock and vibration resistance | ⭐⭐⭐⭐ | ⭐⭐ | ⭐ | ⭐⭐⭐⭐ |
| Reusablility | ⭐ | ⭐⭐ | ⭐⭐ | ⭐ |
| Process reliability | ⭐⭐⭐ | ⭐⭐⭐ | ⭐ | ⭐⭐⭐ |
| Cleanliness | ⭐ | ⭐ | ⭐⭐ | ⭐ |
| Capability | ⭐⭐⭐ | ⭐⭐⭐ | ⭐ | ⭐⭐⭐ |
| Capacity | ⭐⭐⭐ | ⭐⭐⭐ | ⭐ | ⭐ |
| Quality | ⭐⭐⭐ | ⭐⭐⭐ | ⭐ | ⭐⭐⭐ |
| Preservisation of part’s appearance | ⭐⭐⭐ | ⭐⭐⭐ | ⭐ | ⭐⭐ |
| Price | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐ | ⭐⭐ |
