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When misalignment, vibration, or shaft runout causes your CNC router, 3D printer, or stepper motor drive to lose accuracy, the coupling is often the first thing to check. Engineers, makers, and machine builders who need reliable torque transmission without rigid metal-to-metal contact will find the L070 and L075 flexible plum spider jaw shaft couplers a direct solution to those problems.
Each coupler consists of two aluminum alloy hubs and a polyurethane spider insert (plum blossom mat). The L070 model features a 35 mm outer diameter hub body, while the L075 model steps up to a 45 mm outer diameter for higher-torque applications. Bore options range from no-hole blanks (for custom machining) to pre-bored sizes of 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, and 16 mm (approximately 0.31–0.63 in), each available with set-screw holes for secure shaft locking. The spider insert is sold separately as the L070 Plum Blossom Mat in 35 mm diameter.
Typical use cases include CNC lead-screw to stepper motor connections, 3D printer Z-axis couplings, servo motor test rigs, and light-duty power transmission in automation equipment — anywhere a flexible jaw coupling for stepper motors is needed to absorb shock and compensate for angular or parallel misalignment.
L070 (35 mm OD) and L075 (45 mm OD) cover a wide range of torque requirements, from compact 3D printer axes to heavier CNC drive shafts.
Available as no-hole blanks or pre-bored to 8, 10, 12, 14, 15, or 16 mm with set-screw holes, eliminating custom machining for most standard motor shafts.
The plum blossom elastomer insert absorbs vibration and shock loads, protecting motor bearings and reducing noise during operation.
The jaw-and-spider design accommodates angular, parallel, and axial misalignment, making installation forgiving even when shaft alignment is imperfect.
Lightweight yet rigid aluminum alloy construction keeps rotational inertia low while maintaining structural integrity under continuous duty cycles.
The L070 Plum Blossom Mat is available as a standalone item, so you can replace worn inserts without discarding the aluminum hubs.
| Model Options | L070 Shaft Coupler / L075 Shaft Coupler / L070 Plum Blossom Mat |
|---|---|
| Hub Outer Diameter | L070: 35 mm (1.38 in) | L075: 45 mm (1.77 in) |
| Bore Diameter | No Holes (blank) / 8 mm / 10 mm / 12 mm / 14 mm / 15 mm / 16 mm |
| Bore Locking | Set-screw hole (on bored variants) |
| Hub Material | Aluminum alloy |
| Spider Insert Material | Polyurethane (plum blossom elastomer) |
| Coupling Type | Flexible jaw / spider coupling |
| Misalignment Tolerance | See variant options |
| Max Torque | See variant options |
| Surface Finish | Natural anodized aluminum |
| Quantity per Order | 1 PCS (hub or mat, per selection) |
| Compatible Applications | CNC machines, 3D printers, stepper/servo motors, automation equipment |
The L070 has a 35 mm outer diameter hub and suits compact stepper motor setups such as 3D printer Z-axes and light CNC lead screws. The L075 has a 45 mm outer diameter and is designed for higher-torque applications where a larger coupling body is needed. Check your motor flange clearance and torque rating before selecting.
Measure your motor shaft diameter precisely with calipers. Common NEMA 17 stepper shafts are 5 mm and NEMA 23 shafts are typically 6.35 mm or 8 mm. If your shaft size is not listed, order the no-hole blank variant and bore it to your exact specification. All bored variants include a set-screw hole for secure locking.
The L070 Shaft Coupler and L075 Shaft Coupler listings are for the aluminum hub only. The L070 Plum Blossom Mat (35 mm) is a separate line item. If you need a complete coupling assembly, add both the hub pair and the mat to your cart. This also allows you to replace worn inserts independently without buying new hubs.
Flexible plum spider jaw couplings of this type typically accommodate angular misalignment of up to 1°–3° and parallel (radial) offset of up to 0.2–0.5 mm, depending on the spider durometer and hub size. For exact tolerance values specific to your application, contact us to confirm before ordering.
The aluminum alloy hubs are naturally corrosion-resistant and are anodized for additional surface protection. The polyurethane spider insert is resistant to oils and moderate moisture. For prolonged outdoor or high-humidity exposure, periodic inspection of the spider insert is recommended as elastomers can degrade over time under UV or chemical exposure.
Yes. Flexible jaw couplings are widely used to connect stepper or servo motor output shafts to ball screws and lead screws in CNC routers, laser cutters, and milling machines. The spider insert absorbs backlash-inducing shock and reduces vibration transmitted to the screw, helping maintain positioning accuracy.
Currently all variants are listed as 1 PCS per order. One shaft coupler hub connects one end of a shaft. A complete coupling between two shafts requires two hubs (one per shaft end) plus one spider insert. Order accordingly based on how many coupling points your machine requires.
