Torque Limiting Screws for Safety and Precision in Assembly Lines
In modern assembly lines and precision equipment, applying the correct torque is critical. Too little torque can result in loose fasteners, while too much torque can cause plastic cracking, thread stripping, or sensor misalignment.
To solve this, engineers rely on Torque Limiting Screws—specialized fasteners designed to automatically disengage or limit torque transfer beyond a preset value.
At Dongguan Sango Hardware Fasteners Co., Ltd., we manufacture high-precision torque control screws to help our global clients ensure safe, repeatable, and error-proof assembly.
1. What Is a Torque Limiting Screw?
A Torque Limiting Screw is a fastener that features an integrated torque-limiting clutch mechanism. When the preset torque is reached, the screw slips, clicks, or disengages, preventing the user from overtightening it.
🔧 Main Benefits:
- Prevents damage to soft materials (plastic, aluminum)
- Eliminates tool dependency or guesswork
- Improves assembly repeatability
- Reduces training time for workers
- Enhances product safety and lifecycle
2. Types of Torque Limiting Screws
🔹 Preset Torque Breakaway Screw
- Disengages at a fixed torque (e.g., 0.6 Nm, 1.5 Nm)
- Clicks or free-spins once torque threshold is met
🔹 Re-engageable Torque Screw
- Allows repeated use with re-engagement after release
- Used in maintenance or field-serviceable products
🔹 One-Way Torque Screw (Tamper-Proof)
- Torque control in tightening direction only
- Common in consumer electronics and automotive sensors
🔹 Thumb-Screw Style Torque Limiting Screw
- Tool-free, ideal for manual fastening with torque control
- Used in medical devices, covers, and modules
3. Where Are Torque Limiting Screws Used?
- 🧪 Medical devices and lab instruments
- 📟 Consumer electronics and IoT enclosures
- 🔧 Assembly line jigs and fixtures
- 🚘 Automotive sensor modules and dashboard panels
- 🧰 Plastic housings and lighting enclosures
- 📦 Battery packs and smart devices
They are especially valuable where precision torque, operator-proofing, or lightweight materials are involved.
4. Typical Torque Ratings and Standards
| Torque Rating (Nm) | Application Example |
|---|---|
| 0.2–0.5 Nm | Micro-electronics, sensor housings |
| 0.6–1.2 Nm | Plastic panels, display modules |
| 1.5–2.5 Nm | Light fixtures, handheld medical devices |
| 3.0–5.0 Nm | Automotive components, equipment enclosures |