L Type Jaw Coupling Selection Guide – Cost-Effective Couplings for Wave Soldering Machines
L Type jaw couplings (also known as L series or elastic jaw couplings) are among the most economical and widely used flexible couplings for light to medium-duty industrial applications. With a simple three-piece design – two powder metallurgy hubs and one rubber spider – they offer an excellent balance of cost, performance, and ease of maintenance.
This guide explains how L Type couplings work, why they are ideal for wave soldering machines, and how to select the right model for your application.
1. What Is an L Type Jaw Coupling?
An L Type jaw coupling consists of:
Two powder metallurgy (sintered iron) hubs – lightweight, precision-made, cost-effective
One rubber spider (NBR/nitrile butadiene rubber) – oil-resistant, resilient, and elastic
The spider transmits torque while absorbing shock, dampening vibration, and compensating for misalignment. The simple three-piece design allows for quick assembly and disassembly without special tools.
2. Key Advantages of L Type Couplings
| Advantage | Benefit |
|---|---|
| Cost-effective | Powder metallurgy hubs – economical for high-volume applications |
| Lightweight | Low inertia – suitable for high-speed applications |
| Maintenance-free | No lubrication required – reduces operating costs |
| Easy assembly | Three-piece design – no special tools required |
| Fail-safe | Continues to operate if spider fails |
| Misalignment compensation | Angular (1°) and parallel |
| Oil & dirt resistant | NBR spider resists oil, dirt, moisture, and grease |
3. Why L Type Couplings Are Ideal for Wave Soldering Machines
Wave soldering machines are used in large-scale electronic assembly processes to solder components to PCBs. L Type couplings are commonly used in these machines:
| Requirement | How L Type Coupling Meets It |
|---|---|
| Cost-effective | Powder metallurgy hubs – economical for production equipment |
| Lightweight | Low inertia – suitable for high-speed conveyor drives |
| Maintenance-free | No lubrication – reduces downtime |
| Easy maintenance | Quick spider replacement – minimizes production stops |
| Vibration damping | Rubber spider – protects sensitive electronics |
| Fail-safe | Continues to operate if spider fails – prevents production stops |
✅ Commonly used in wave soldering and reflow soldering equipment – L070 and L075 are popular sizes.
4. Material Selection – Powder Metallurgy vs Cast Iron
Standard L Type coupling hub materials are:
| Size Range | Hub Material |
|---|---|
| L035 to L190 | Powder metallurgy (sintered iron) |
| L225 to L276 | Cast iron |
✅ Powder metallurgy provides a cost-effective, lightweight solution for most applications. Cast iron is used for larger, higher-torque models.
5. Spider Material Options
| Spider Material | Torque | Temperature | Best For |
|---|---|---|---|
| NBR Rubber (Standard) | Baseline | -40°C to 100°C | General purpose, oil resistance, vibration damping |
| Urethane | 1.5x NBR | Limited | Higher torque, less damping |
| Hytrel® | Up to 3x NBR | -51°C to 121°C | High torque, high temperature, oil/chemical resistance |
| Bronze | Up to 3x NBR | -40°C to 230°C | Low speed (≤250 RPM), extreme conditions |
✅ The standard NBR rubber spider is recommended for most applications requiring vibration damping and oil resistance.
6. Model Selection – L035 to L225
The L Type series covers a wide range of sizes:
| Model | Max Bore (mm) | Nominal Torque (N·m) | Typical Application |
|---|---|---|---|
| L035 | 9.5 | 0.4 | Small instrumentation |
| L050 | 15.9 | 3.0 | Light-duty drives |
| L070 | 19.1 | 4.9 | Small conveyors, pumps |
| L075 | 22.2 | 10.2 | Wave soldering machines |
| L090 | 25.4 | 16.3 | General machinery |
| L095 | 28.6 | 21.9 | Medium-duty drives |
| L099 | 30.2 | 35.9 | Compressors |
| L100 | 34.9 | 47.1 | Pumps |
| L110 | 41.3 | 89.5 | Heavy-duty |
| L150 | 47.6 | 140 | Industrial machinery |
| L190 | 54.0 | 195 | High-torque |
| L225 | 66.7 | 264 | Heavy industrial |
7. Installation & Maintenance Tips
Clean shafts and bores – Remove oil, grease, and debris before assembly.
Check alignment – Even with misalignment compensation, keep within recommended limits.
Install spider correctly – Ensure proper fit between the two hubs.
No lubrication required – Spider is self-lubricating.
Inspect spider periodically – Replace if cracked, worn, or deformed.
Fail-safe backup – If spider fails, schedule prompt replacement.
8. Selection Checklist
Model: L035 to L225 – select based on torque and bore requirements
Hub material: Powder metallurgy (L035-L190) or cast iron (L225+)
Spider material: NBR rubber (standard) – oil-resistant, vibration damping
Bore size: Match your shaft diameters – custom bores available
Application: Wave soldering, conveyor, pump, compressor, general machinery
Maintenance: Maintenance-free – no lubrication required
9. Conclusion
The L Type elastic jaw coupling from Apex Coupling offers the perfect combination of cost-effectiveness, lightweight construction, and maintenance-free operation for wave soldering machines and general industrial applications. With powder metallurgy hubs, NBR rubber spider, and a wide model range from L035 to L225, there is a model to suit every application.
👉 Need an L Type coupling for your application? Contact us with your model size and bore requirements.
Inquiry now:
ella@apexcoupling.com
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