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When rigid couplings cause vibration, noise, or premature bearing wear in your CNC router, 3D printer, or automation rig, the root cause is almost always shaft misalignment. Engineers and makers who demand smooth, low-backlash motion need a coupling that absorbs angular and parallel offset without sacrificing torque transmission. This L-type jaw coupling is designed for exactly that use case.
Each set consists of two aluminum alloy hubs (L-type jaw profile) and one polyurethane plum blossom spider insert. The hubs are available in outer diameters of 35 mm (~1.38 in), 45 mm (~1.77 in), 55 mm (~2.17 in), and 65 mm (~2.56 in), with bore options ranging from 8 mm to 28 mm including standard keyway configurations (4 mm, 5 mm, and 8 mm keyways). No-hole blanks are also available for custom machining.
Typical applications include NEMA 17/23/34 stepper motor shaft connections on 3D printers and CNC machines, servo motor couplings in pick-and-place automation, lead screw and ball screw drive connections, and general-purpose flexible shaft coupling for light industrial equipment where vibration damping is required.
| Coupling Type | L-Type Jaw / Plum Spider (Oldham-style flexible) |
|---|---|
| Hub Material | Aluminum Alloy |
| Spider Insert Material | Polyurethane (PU) |
| Outer Diameter (OD) | 35 mm / 45 mm / 55 mm / 65 mm — See variant options |
| Bore Diameter | 8 mm – 28 mm (with keyway) or No Holes — See variant options |
| Keyway Options | 4 mm, 5 mm, 8 mm — See variant options |
| Finish | Natural anodized / mill finish aluminum |
| Misalignment Tolerance | Angular: typically up to 1° · Parallel: typically up to 0.5 mm |
| Quantity per Order | 1 PCS (hub set + spider insert) |
| Weight | See variant options |
Match the OD to your shaft center distance and housing clearance. The 35 mm OD suits compact NEMA 17 stepper setups; 45 mm and 55 mm fit NEMA 23 and mid-frame servos; 65 mm is suited to larger NEMA 34 or industrial servo motors. If in doubt, measure the flange or bearing housing clearance on your machine frame before ordering.
Select the bore that matches your motor or lead screw shaft diameter. For plain round shafts, choose the matching bore without a keyway. For keyed shafts, match both the bore diameter and keyway width (4 mm, 5 mm, or 8 mm). If you need a non-standard bore, order the No Holes blank and machine it to your exact specification.
The aluminum jaw hubs are designed for light-to-medium duty torque transmission typical of CNC stepper motors (NEMA 17–34) and small servo motors. For exact torque ratings by size, please contact us to confirm — torque capacity varies by OD and bore configuration and we can advise based on your specific motor specs.
Yes — each order includes both aluminum hubs and one polyurethane plum blossom spider insert. The spider insert is a separate, replaceable component. You can also order the 35 mm or 55 mm Diameter Plum Blossom Mat variants individually as replacement inserts without purchasing new hubs.
The hubs are machined from aluminum alloy which offers good natural corrosion resistance for indoor and light-duty environments. For applications exposed to moisture, coolant mist (e.g., CNC wet cutting), or outdoor conditions, we recommend applying a light coat of anti-corrosion spray or selecting a stainless steel coupling alternative.
Yes — this coupling is widely used to connect stepper motor shafts to lead screws (T8, T12, etc.) and ball screws on 3D printers, CNC routers, and laser engravers. Verify your motor shaft diameter and lead screw shaft diameter, then select the matching bore variant. The flexible spider insert compensates for minor misalignment between the motor and screw axes.
The L Shaft Coupler variants include the complete coupling assembly: two aluminum jaw hubs plus one spider insert. The Plum Blossom Mat variants (35 mm and 55 mm Diameter) are replacement spider inserts only — intended for customers who already have the hubs and only need to replace the worn elastomer element.
