Craft
32 years of precision metal manufacturing
From watch components to all-metal pens: tolerances held by instruments, processes held in documents. This page states capability limits, not adjectives.
Manufacturing capability
Machining equipment
596
units. 271 for pre-processing (CNC and cam automatic machines), 65 for post-processing (Okada, Jingdiao, polishing, tumbling), 260 for inspection and measurement.
Share of inspection equipment
43%
260 inspection units, about 43% of all equipment — roundness and profile testers, 3D profilers, inline vision measurement, hardness testers, salt-spray, water-resistance and fatigue testers, high-magnification microscopes.
Dimensional tolerance
±0.01 mm
A capability carried over from the watch-component era. It is held by inspection equipment, not by operator feel.
Good yield at factory exit
96.3%
Share of finished goods released after the three-stage control process.
Return rate
0.5%
Returns within the 10-year warranty caused by anything other than misuse.
Warranty
10 年
On all 13 models in the range — barrel deformation, tip breakage, magnetic failure, thread jamming, abnormal anodizing.
Three-stage quality control
01
Before production
- Tooling: separate tooling-standard documents per material, machine and product.
- Programs: standard machining programs documented per machine.
- Process routing: documented process files and operation sequences for each product family.
- Inspection: standard inspection documents per product family.
02
During production
- 72-hour S/L certification — S covers engineering (output stays conforming for 72 h after start-up), L covers production (conforming for 72 h after operator handover). Applied mainly to large-volume orders.
- Grade 0–3 control: 0 exceeds expectation, 1 fully meets standard, 2 conforms with minor defects, 3 does not conform (quarantined). The focus is grade 2 — a firewall stops it from spreading into grade 3.
03
After production
- Mature processes are documented so consistency does not depend on one individual.
- Control documents are revised when customer requirements change, and training is updated to match.
How we got here
Since 1951
Watch components
We started on watch crowns, pushers and connectors — parts held to hundredths of a millimetre, verified by instrument rather than by eye. That history set our tolerance discipline.
Since 1994
Precision metal manufacturing
A dedicated factory for CNC turning, milling, grinding and surface finishing. The 596-unit machining and inspection base was built up layer by layer across these 32 years.
Since 2023
Our own brand, BTST
Before that we manufactured OEM / ODM for Japanese and international stationery houses. Since 2023 we sell under our own brand, defining form, structure and colour ourselves.