Jovvi Non-Magnetic Titanium Tool Kit for MRI Engineering – Version
3 (Step‑by‑Step Selection Guide for MRI Engineers)
1. Quality – Understanding the Three Titanium Grades Used by Jovvi
Not all titanium tools perform the same. Jovvi selects specific
titanium alloys based on tool function:
| Titanium Grade | Composition | Hardness (HRC) | Used For | Key Property |
|---|
| Grade 2 (Commercially Pure) | 99.2% Ti | 20–25 | Tweezers, rulers, putty knives | Formability, corrosion resistance |
| Grade 5 (Ti‑6Al‑4V) | 90% Ti, 6% Al, 4% V | 36–42 | Hex keys, screwdrivers, wrenches, sockets | High strength, wear resistance |
| Grade 23 (Ti‑6Al‑4V ELI) | Extra low interstitials | 34–38 | Torque wrenches, cryostat tools | Fracture toughness at low temperature |
Quality guarantee: Every tool is laser‑marked with grade code (e.g., “Gr5” for Grade
5). No mixing of lower grades without disclosure.
2. Application Scenarios – Task‑Based Selection Flowchart
Use the following decision tree to select the correct Jovvi tool
for each MRI engineering task.
Step 1: Identify the MRI Zone and Field Strength
| Zone | Field Strength | Tool Requirement | Recommended Jovvi Kit |
|---|
| Zone IV (Scanner Room – within 0.5 m of bore) | 0.5–7 T | Maximum safety, no artifacts | ProKit‑2 or ProKit‑3 |
| Zone III (Control Room – outside 0.5 m but inside Faraday cage) | < 0.5 mT | Non‑magnetic, lower artifact concern | ProKit‑1 (sufficient) |
| Zone II (Corridor – outside shielded room) | Earth field only | Any non‑ferrous | ProKit‑1 or standard brass tools |
| Inside bore (during servicing with magnet ramped down) | 0 T (if ramped) | Any, but Jovvi Ti still recommended | Any kit (magnetic susceptibility irrelevant when field is zero) |
Jovvi note: Even when the magnet is ramped down, residual magnetism in steel
tools can later transfer to scanner components. Always use
titanium.
Step 2: Identify the Specific Task – Tool by Tool
Task Category A: Fastener Manipulation (Screws, Bolts, Nuts)
| Fastener Type | Common Location | Recommended Jovvi Tool | Titanium Grade | Alternative (Not Recommended) |
|---|
| Hex socket (1.5–6 mm) | RF coil covers, gradient panels | Hex key set (L‑style) | Grade 5 | Brass hex keys (strip easily) |
| Hex socket (8–19 mm) | Cryostat ports, patient table mounts | Socket set + ratchet | Grade 5 sockets + Be‑Cu ratchet | 316 stainless (artifacts) |
| Torx (T6–T30) | Magnet cover panels, RF screens | Torx drivers (fixed handle) | Grade 5 tip, brass handle | Ceramic (brittle) |
| Phillips / Flathead | Control console, accessory mounts | Screwdrivers (3–6 mm) | Grade 5 blade, brass/plastic handle | 316 stainless (magnetizes over time) |
| Hex nut (exposed) | Helium vent line flanges | Open‑end wrench set | Grade 5 | Brass (jaws spread under torque) |
Jovvi ProTip: For cryostat port nuts (often tight due to thermal cycling), use Jovvi torque wrench (1–10 N·m) with Grade 23 titanium socket. Never exceed 8 N·m on helium port
nuts.
Task Category B: Cutting, Prying, and Striking
| Task | Recommended Jovvi Tool | Titanium Content | Safety Note |
|---|
| Cutting copper RF mesh | Diagonal cutters | 90% Ti jaws, bronze pivot | Non‑sparking – safe near oxygen |
| Prying RF shield panels | Titanium crowbar (300 mm) | 100% Grade 5 | Use plastic shims to avoid scratching copper |
| Removing old conductive paste | Titanium putty knife | 100% Grade 2 | Flexible blade conforms to curved surfaces |
| Hammering copper fasteners | Titanium hammer (200 g head) | 100% Grade 5 | Replaceable face inserts (nylon for soft blows) |
| Retrieving dropped screw inside bore | Non‑magnetic pick‑up tool | 100% Grade 5 stem, magnet‑free claw | No magnet – uses mechanical grabber |
Task Category C: Measurement and Inspection
| Need | Recommended Jovvi Tool | Titanium Content | Special Feature |
|---|
| Gap measurement (e.g., between RF coil and bore) | Titanium ruler (150 mm or 300 mm) | 100% Grade 2 | Etched markings (no painted ink that could flake) |
| Depth measurement (socket head screws) | Titanium depth gauge | 100% Grade 5 | Slide mechanism with brass lock screw |
| Visual inspection in tight spaces | Non‑magnetic inspection mirror | Titanium stem, acrylic mirror | Mirror detachable for cleaning |
| Magnetic field detection (locating stray field) | Not a tool – use gaussmeter | N/A | Never bring a gaussmeter inside bore – it will saturate |
Step 3: Determine Kit Size Based on Frequency of Use
| Usage Frequency | Recommended Kit | Rationale |
|---|
| Once per month (occasional service) | ProKit‑1 (18 tools) | Sufficient for 90% of fastener tasks |
| Once per week (in‑house MRI engineer) | ProKit‑2 (32 tools) | Adds sockets, ratchet, torque wrench, pliers |
| Daily (field service engineer, cryogen specialist) | ProKit‑3 (45 tools) | Adds deep sockets, crowbar, putty knife, inspection mirror |
| Department with >3 MRI scanners | Two ProKit‑2 kits | One kept in Zone IV, one in workshop – avoids cross‑zone
contamination |
3. Tool Variety – Detailed Specifications of Jovvi’s 90% Titanium
Tools
Hex Key Set (Grade 5, 100% Ti)
Sizes: 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10 mm (ball‑end on long arm)
Torque rating: 5 N·m max (1.5 mm), 25 N·m max (10 mm)
Marking: Size laser‑etched on shaft (no paint)
Magnetic susceptibility: < 5 × 10⁻⁶ (tested per tool)
Screwdriver Set (Grade 5 blade, brass handle)
Tip sizes: Phillips #0, #1, #2; Flat 3 mm, 5 mm, 6 mm; Torx T6, T8,
T10, T15, T20, T25, T30
Blade length: 100 mm (standard) or 150 mm (long reach)
Handle: Brass with knurled grip – non‑magnetic, non‑sparking
Tang-through construction: Blade extends full handle length for
torque transfer
Socket Set (Grade 5, 100% Ti)
Drive sizes: 1/4″ and 3/8″ square drive (square drive is titanium –
no steel insert)
Socket sizes: 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19 mm
(6‑point, deep and shallow)
Wall thickness: 2 mm (thinner than steel sockets – allows access to
recessed fasteners)
Marking: Size stamped (not etched – stamped marks remain legible
after wear)
Ratchet Handle (Titanium body, brass gears)
Drive size: 1/4″ (for 6–13 mm sockets) or 3/8″ (for 10–19 mm
sockets)
Gear mechanism: Beryllium copper (Be‑Cu) – 60 teeth, 6° swing arc
Reverse lever: Brass (no ferromagnetic detent ball – uses friction
detent)
Torque capacity: 25 N·m (1/4″), 60 N·m (3/8″)
Torque Wrench (Grade 23 Ti beam, Be‑Cu spring)
Range: 1–10 N·m (preset adjustable)
Accuracy: ±5% of reading (certified with test report)
Body: Titanium (Grade 23 for low‑temperature toughness – cryostat
use)
Spring: Beryllium copper (non‑ferromagnetic, stable spring rate)
Pliers (90% Ti jaws, bronze pivot)
Types: Needle nose (150 mm), diagonal cutters (130 mm), combination
pliers (180 mm)
Jaws: Grade 5 titanium – hardened to 40 HRC at gripping surface
Pivot: Phosphor bronze – non‑magnetic, self‑lubricating
Handles: Titanium with heat‑shrink grip (no steel springs inside)
Hammer (100% Ti head, fiberglass handle)
Head weight: 200 g, 300 g, or 500 g
Head material: Grade 5 titanium – one‑piece forged (no steel
insert)
Face: Removable nylon or polyurethane inserts for soft blows
Handle: Fiberglass – non‑conductive, non‑magnetic (avoid wood –
splinters near cryostat)
4. Production Assurance – Testing for Every Tool Category
Jovvi performs tool‑specific quality tests beyond general ferromagnetic screening:
| Tool Category | Additional Test | Pass Criterion |
|---|
| Hex keys | Torque to failure (destructive sample from each batch) | Fails at >2× rated torque |
| Screwdrivers | Tip hardness (Rockwell) | 38–42 HRC (Grade 5) |
| Sockets | Concentricity (runout) | < 0.1 mm measured at drive square |
| Ratchet | Cycle test (10,000 cycles at 50% max torque) | No gear skipping or wear debris |
| Torque wrench | Calibration drift (after 1,000 cycles) | < ±5% from baseline |
| Pliers | Cutting ability (copper wire) | Clean cut, no jaw deformation |
| Hammer | Impact test (10,000 blows at 2 J) | No head cracking or handle loosening |
Each kit includes a test summary card showing batch‑pass results for the specific tools inside.
5. Quick Selection Table – Which Jovvi Kit for Which MRI Role?
| MRI Role | Primary Tasks | Recommended Jovvi Kit | Why |
|---|
| In‑house hospital MRI engineer | Daily patient table adjustments, coil swaps, basic maintenance | ProKit‑2 (32 tools) | Covers 95% of tasks, includes torque wrench |
| Field service engineer (OEM) | Full scanner disassembly, cryostat access, gradient replacement | ProKit‑3 (45 tools) | Deep sockets, crowbar, putty knife essential |
| MRI construction / installation crew | RF shield assembly, magnet room finishing | ProKit‑1 (18 tools) + separate titanium hammer | Hammer not in ProKit‑1 – order separately |
| Cryogen service specialist | Helium fills, vent line maintenance, cryostat port work | ProKit‑3 (45 tools) + additional torque wrench | Deep sockets and low‑temp‑rated Grade 23 tools |
| Research MRI (7T, animal MRI) | Small coil repairs, precision adjustments | ProKit‑2 (32 tools) with smaller hex keys (down to 0.9 mm) | |
