Jovvi international
| Delivery Time | 7-14days |
| Place Of Origin | China |
| Wire diameter | 12 mm |
| Packaging Details | Carton&wooden Box |
| Coating thickness | 20-50 μm |
| Tolerance | ±0.02 mm |
| Payment Terms | T/T |
| Bend radius | 4× wire diameter |
| Drive end size | 6.35 mm ±0.02 mm |
| Supply Ability | 300 Set / Month |
| Ball end radius | 1.5× across-flats |
| Brand Name | Jovi |
| Model Number | 1-cf-7 |
| Certification | ISO |
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Product Specification
| Delivery Time | 7-14days | Place Of Origin | China |
| Wire diameter | 12 mm | Packaging Details | Carton&wooden Box |
| Coating thickness | 20-50 μm | Tolerance | ±0.02 mm |
| Payment Terms | T/T | Bend radius | 4× wire diameter |
| Drive end size | 6.35 mm ±0.02 mm | Supply Ability | 300 Set / Month |
| Ball end radius | 1.5× across-flats | Brand Name | Jovi |
| Model Number | 1-cf-7 | Certification | ISO |
Hex keys begin as drawn titanium wire – Grade 5 Ti that has been pulled through hexagonal dies.
Wire drawing process:
Titanium rod (12 mm diameter) heated to 700°C
Pulled through first hexagonal die (reduction 20%)
Annealed (700°C, 1 hour) to relieve stress
Pulled through second die (smaller hex)
Repeated until final size reached (e.g., 3 mm across flats)
Result: Hexagonal cross‑section with precise dimensions and smooth surface (no machining marks).
Quality check: Laser micrometer measures across‑flats every 10 meters. Tolerance: ±0.02 mm.
| Step | Process | Key Parameter |
|---|---|---|
| 1 | Cut drawn wire to length (200–300 mm) | Length tolerance ±0.5 mm |
| 2 | Bend 90° (short arm) on CNC bender | Bend radius 4× wire diameter |
| 3 | Heat treat (age hardening) – already done on wire? | Wire pre‑aged; no additional heat treat |
| 4 | Grind ball end (optional) | Spherical radius = 1.5× across‑flats |
| 5 | Bead blast (matte finish) | Glass beads, 60 psi |
| 6 | Laser mark | Size + “Ti ≥90%” + batch number |
Ball end grinding:
Fixture rotates hex key while grinding wheel moves in arc
Result: Smooth sphere on long arm tip
Inspection: Optical comparator – ball end must not have flat spots
Critical dimension: Short arm length (varies by size)
| Size (mm) | Short arm length (Jovvi) | Application |
|---|---|---|
| 1.5 | 15 mm | Tight RF coil access |
| 2.0 | 18 mm | Standard |
| 2.5 | 20 mm | Standard |
| 3.0 | 25 mm | Standard |
| 4.0 | 28 mm | General |
| 5.0 | 32 mm | General |
| 6.0 | 36 mm | High torque |
| 8.0 | 45 mm | Large fasteners |
| 10.0 | 55 mm | Cryostat external |
T‑handles provide better ergonomics and higher torque capability.
Construction:
Hex shaft: Same drawn wire as L‑style, cut to 150–200 mm length
Handle: Brass (cast) or aluminum (machined) – both non‑magnetic
Assembly: Shaft pressed into handle with epoxy (MRI‑safe)
Tang option: Shaft extends through handle (visible at top) – confirms no steel core
Torque advantage: T‑handle allows 20–30% higher torque than L‑style before hand fatigue.
Sizes: 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm (handles color‑coded by size).
For animal MRI (7T, 9.4T) and small device repair, standard hex keys are too large.
Manufacturing challenges:
Drawn wire below 1 mm is difficult (breaks during drawing)
Jovvi uses centerless grinding of titanium rod to hexagonal cross‑section (not drawn)
Process: Rod rotated while grinding wheel forms hex shape
Tolerance: ±0.01 mm (critical for 0.7 mm size)
Inspection: 100% optical measurement (microscope with digital scale). Reject any with corner radius >0.02 mm.
Set: 0.7 mm, 0.9 mm, 1.3 mm (stored in foam case with size labels).
For use with ratchet or torque wrench:
| Step | Process |
|---|---|
| 1 | Machine hex tip (same as L‑style end) on CNC lathe |
| 2 | Machine 1/4″ hex drive end (opposite side) |
| 3 | Heat treat (age harden) |
| 4 | Bead blast |
| 5 | Laser mark size + “Ti” |
Drive end tolerance: 6.35 mm ±0.02 mm across flats (fits standard 1/4″ drivers).
| Size (mm) | Torque to failure (N·m) – Jovvi Ti | Failure mode |
|---|---|---|
| 1.5 | 2.5 | Torsional fracture at bend |
| 2.0 | 5.0 | Torsional fracture at bend |
| 2.5 | 8.0 | Torsional fracture at bend |
| 3.0 | 12.0 | Torsional fracture at bend |
| 4.0 | 20.0 | Torsional fracture at bend |
| 5.0 | 30.0 | Twisting (plastic deformation) |
| 6.0 | 40.0 | Twisting (plastic deformation) |
Acceptance criterion: Failure torque must exceed 2× recommended max torque (from Version 6 table). Jovvi exceeds this standard.
For customers using titanium hex keys with titanium screws (e.g., custom MRI coils), Jovvi offers a plasma electrolytic oxidation (PEO) coating.
PEO process:
Hex key immersed in electrolyte (phosphate-based)
High voltage (500–800 V) applied – plasma discharges form ceramic oxide layer
Resulting coating: TiO₂ (rutile) – thickness 20–50 μm
Benefit: Reduces coefficient of friction (Ti‑on‑Ti) from 0.8 to 0.3
Order code: Add “‑PEO” to hex key part number (e.g., JOHL‑9‑PEO). Lead time +5 days.
Company Details
Year Established:
2010
Total Annual:
10000000-20000000
Employee Number:
100~500
Ecer Certification：
Verified Supplier
Jovvi(Beijing Hengtai Tech Co., Ltd) was established in 2010. The company adheres to the development concept of “integrity all over the world and conducts all continents”, adheres to the business policy of “strive to create greater value for customers”, and is committed... Jovvi(Beijing Hengtai Tech Co., Ltd) was established in 2010. The company adheres to the development concept of “integrity all over the world and conducts all continents”, adheres to the business policy of “strive to create greater value for customers”, and is committed...
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