Easy Maintenance Non Magnetic Tool Kit with Anti-slip Rubber Handle and Corrosion Resistant Durability
Count the hex socket screws on an MRI scanner:
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Magnet cover panels: 20–30 screws
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RF coil housings: 10–15 screws
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Gradient coil covers: 15–20 screws
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Patient table rails: 8–12 screws
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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:
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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.
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Create artifacts – Even weakly magnetic tools cause image distortion.
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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.”
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