Jovvi international
| Supply Ability | 300 Set / Month |
| Place Of Origin | China |
| Delivery Time | 7-14days |
| Payment Terms | T/T |
| Service life | 20,000+ uses |
| Hardness | 38-42 HRC |
| Handle material | Anti-slip rubber |
| Case color | Black |
| Max torque | 1.0-40.0 N*m |
| Ball end option | Yes |
| Packaging Details | Carton&wooden Box |
| Brand Name | Jovi |
| Certification | ISO |
| Model Number | 1-cf-7 |
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Product Specification
| Supply Ability | 300 Set / Month | Place Of Origin | China |
| Delivery Time | 7-14days | Payment Terms | T/T |
| Service life | 20,000+ uses | Hardness | 38-42 HRC |
| Handle material | Anti-slip rubber | Case color | Black |
| Max torque | 1.0-40.0 N*m | Ball end option | Yes |
| Packaging Details | Carton&wooden Box | Brand Name | Jovi |
| Certification | ISO | Model Number | 1-cf-7 |
Count the hex socket screws on an MRI scanner:
Magnet cover panels: 20–30 screws
RF coil housings: 10–15 screws
Gradient coil covers: 15–20 screws
Patient table rails: 8–12 screws
Accessory mounts: 5–10 screws
Total: 60–90 hex screws per scanner. Each requires a hex key. If your hex key fails (strips, breaks, or becomes magnetic), you cannot service the scanner.
| Type | Sizes | Best For | Sales Message |
|---|---|---|---|
| L-style (standard) | 1.5–10 mm | General service | “The workhorse – ball end allows 25° angled entry” |
| L-style (short arm) | 1.5–6 mm | Tight spaces | “Fits inside RF coil housings where others won’t reach” |
| T-handle | 2–6 mm | High torque | “Ergonomic grip – reduces hand fatigue during 50+ screw days” |
| Hex bits (1/4″ drive) | 2–6 mm | Ratchet or torque wrench | “Precise torque control for cryostat fasteners” |
| Extra-long (200 mm shaft) | 2–4 mm | Deep recessed screws | “Reaches screws buried 150 mm inside gradient assembly” |
| Micro | 0.7–1.3 mm | Animal MRI, small devices | “Essential for 7T animal coils – no alternative exists” |
Brass hex keys are cheap ($2–5 each) but fail quickly:
| Use Count | Brass Hex Key Condition | Consequence |
|---|---|---|
| 0–10 uses | New – works fine | None |
| 10–30 uses | Corners begin rounding | Slight play in screw head |
| 30–50 uses | Significant rounding | Risk of stripping screw head |
| 50+ uses | Unusable – slips in every screw | Engineer frustrated; stripped screw extraction required |
Cost of one stripped screw: $5,000 in parts (replace RF coil), 2 hours labor, 1 hour scanner downtime → $6,500+. A $5 brass hex key just caused $6,500 in damage.
Stainless steel hex keys (316, 304) are harder (55 HRC) and last longer, but:
Become magnetic – Cold working from repeated insertion/stress causes martensitic transformation. A “non‑magnetic” stainless hex key after 6 months may attract to a 3T magnet.
Create artifacts – Even weakly magnetic tools cause image distortion.
Ferromagnetic fragments – If a stainless hex key breaks (possible under high torque), fragments are ferromagnetic and can damage cryostat.
| Parameter | Jovvi Ti | Brass | 316 Stainless |
|---|---|---|---|
| Hardness (HRC) | 38–42 | 20–25 | 55–60 (but work hardens) |
| Service life (uses) | 20,000+ | <50 | 5,000+ (but becomes magnetic) |
| Magnetic after 1 year? | No | No | Yes (often) |
| Ball end option | Yes | Yes (but wears fast) | Yes |
| Cost per hex key (3 mm) | $15 | $3 | $8 |
| 5‑year cost (replacements) | $15 (one key) | $3 × 20 replacements = $60 | $8 × 2 replacements = $16 (plus artifact costs) |
Sales close: “The $15 Jovvi titanium hex key outlasts twenty $3 brass hex keys – and never causes artifacts. Which is really cheaper?”
| Size (mm) | Recommended Max Torque (N·m) | Application |
|---|---|---|
| 1.5 | 1.0 | Small set screws |
| 2.0 | 2.0 | RF coil fasteners |
| 2.5 | 3.5 | Magnet cover panels |
| 3.0 | 6.0 | General service |
| 4.0 | 10.0 | Gradient assembly |
| 5.0 | 15.0 | Patient table rails |
| 6.0 | 20.0 | Large mounting bolts |
| 8.0 | 30.0 | Cryostat external nuts |
| 10.0 | 40.0 | Heavy equipment anchors |
Warning to customer: “Exceeding these torques with the ball end? You will strip the screw head. Use the straight end for final tightening.”
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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