M2–M16 Alumina Screws — High-Temperature, Electrically Insulating Ceramic Fasteners

Ceramic Screws Alumina Applications

• Heat-Treat & Industrial Furnaces

  ✅Key Advantages

  1. Electrical Isolation at Heat: Maintains insulating joints in hot zones for fixture stability.
  2. Oxidation-Free Fastening: Avoids seizing and galling commonly seen with hot metals.
  3. Clean Hot-Zone Contact: Limits contamination versus corroded or plated metal hardware.

  ✅ Problem Solved

  A furnace OEM replaced metal M6 fixture screws in the 900–1100 °C region with alumina screws to prevent oxidation-locking and shorting across sensor mounts. After changeover, fixture teardown time dropped, sensor drift events decreased, and maintenance intervals extended due to stable insulating joints and corrosion-free contact surfaces.

• Laboratory / Analytical Equipment

  ✅Key Advantages

  1. Non-Magnetic Fastening: Reduces magnetic interference near probes and micro-balances.
  2. Insulating Mounts: Minimizes noise from ground loops in sensitive circuits.
  3. Low Particle Interfaces: Ground contact surfaces for repeatable instrument alignment.

  ✅ Problem Solved

  A test-rig builder standardized alumina ceramic screws for insulating standoffs around measurement cells. The switch mitigated leakage paths and reduced re-zeroing frequency, improving repeat test pass rates while preserving clean, non-magnetic assembly conditions.

• Chemical Process Assemblies

  ✅Key Advantages

  1. Acid/Alkali Compatibility: Suitable near corrosive media (non-wetted fastener positions).
  2. Electrical Isolation in Wet Zones: Limits stray currents that accelerate corrosion.
  3. Dimensional Stability: Maintains clamp force where metallic fasteners require frequent replacement.

  ✅ Problem Solved

  A chemical pilot line replaced mixed-metal hardware near an acid scrubber with alumina fasteners and alumina washers to keep joints electrically isolated. Fastener replacement cycles lengthened and torque retention checks became less frequent due to reduced corrosion-coupled loosening.

Alumina Screws Usage Instructions

• Installation

  1. Use calibrated torque drivers and begin with low torque, increasing gradually to prevent cracking.
  2. Recommended assembly torque ≈ 40–50% of the verified failure torque for the same size.
  3. Always pair with alumina washers and nuts to distribute load evenly and maintain insulation.
  4. Align the screw straight during tightening; avoid side or bending forces on the head.

• In-Service Use

  1. Place outside direct flame or plasma zone; alumina screws serve best as insulating connectors, not heavy-load anchors.
  2. In cyclic heating equipment, re-check the torque after 2–3 thermal cycles, as metal counterparts may relax.
  3. Keep joints clean and free of conductive debris to maintain electrical insulation.
  4. When exposed to corrosive atmospheres, periodically inspect for glaze discolouration or surface deposits indicating chemical attack.

• Storage

  1. Store in partitioned trays or foam-lined boxes to avoid contact damage or chipping.
  2. Keep screws separated from metal hardware to prevent scratches or contamination.
  3. Attach or maintain labels for size, thread, and material to avoid mix-ups during assembly.
  4. For long-term storage, maintain a dry, vibration-free environment to prevent accidental edge impact.

• Cleaning

  1. Use neutral solvents or deionized (DI) water; avoid alkaline or acidic cleaning agents.
  2. For surface dust, use soft nylon brushes or compressed air—never metal brushes.
  3. After cleaning, dry completely at ≤120 °C before reinstallation near electrified or vacuum systems.
  4. Do not apply lubricants unless approved for ceramic-to-metal joints.

• Common Misuse & Fixes

  1. Over-torque fracture → Use a torque reference table; add a washer; tighten gradually in steps.
  2. Edge chipping during handling → Use tray compartments, rubber-tipped tweezers, or gloved handling.
  3. Loss of insulation due to mixed hardware → Replace all mating parts with alumina nuts/washers to keep full insulation.
  4. Thermal shock cracks → Allow uniform preheating/cooling; avoid direct flame impingement.
  5. Surface glaze dulling → Indicates contamination or alkali attack; clean with neutral solvent and inspect.

Alumina Ceramic Screws FAQ

1. Q: What is the working temperature limit of alumina ceramic screw parts?
   A: They can typically operate up to 1650 °C, depending on the fixture design and torque load. This makes them suitable for hot-zone insulation and non-conductive mounting applications.
2. Q: Are alumina ceramic nut parts compatible with metal bolts?
   A: Yes, but for full electrical insulation, it’s recommended to pair alumina ceramic nut parts with matching ceramic screws and washers to eliminate conductive paths.
3. Q: Can alumina ceramic screw parts handle structural loads?
   A: These fasteners are designed for insulating or positioning purposes rather than high-impact structural clamping. For heavy mechanical loads, hybrid joints or metal-ceramic combinations are preferred.
4. Q: Can alumina ceramic screw parts handle structural loads?
   A: These fasteners are designed for insulating or positioning purposes rather than high-impact structural clamping. For heavy mechanical loads, hybrid joints or metal-ceramic combinations are preferred.
5. Q: Can I customize alumina ceramic screw parts?
   A: Yes, customizations include thread types (M2–M16, UNC/UNF), head styles (hex, socket, slotted), length, and surface finishing. Engineering drawings can be reviewed before production.
6. Q: Are alumina ceramic screws reusable?
   A: Yes, if torque is properly controlled and no cracks appear. Always inspect after disassembly and replace any part showing micro-chipping on threads or edges.

What our Clients Say about Alumina Screws

• ⭐️⭐️⭐️⭐️⭐️
  We adopted alumina ceramic screw for our thermal analysis systems to replace stainless fasteners. The change completely eliminated oxidation issues in the hot zone, and the insulation quality exceeded our expectations. Their technical support team helped us fine-tune the torque for ceramic installation.
  -- David Li – Senior Equipment Engineer, SinoTherm Instruments
• ⭐️⭐️⭐️⭐️⭐️
  The alumina ceramic nut parts we ordered fit perfectly with our existing jigs. The threads were precise and clean, and the packaging prevented any edge chipping. It’s a reliable option for long-term projects where corrosion and magnetic interference must be avoided
  -- Emily Roberts – Procurement Manager, EuroChem Components Ltd.
• ⭐️⭐️⭐️⭐️⭐️
  The alumina ceramic screws and washers kept our test rig non-magnetic and electrically isolated. Custom lengths matched our jigs without re-machining.
  -- Yuki Tanaka — Process Engineer, Kanto Lab Systems
• ⭐️⭐️⭐️⭐️⭐️
  Custom socket-head alumina screws with ground bearing faces solved clamp marks near probes. Rebuilds are cleaner and faster now
  -- Jonas Meier — R&D Technician, HeatTreat Solutions