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When a misaligned or rigid shaft connection causes vibration, skipped steps, or premature bearing wear on your CNC router, 3D printer, or laser engraver, the root cause is almost always the coupling. Engineers and makers who demand smooth, backlash-resistant motion transmission need a coupling that absorbs angular and parallel misalignment without sacrificing torque transfer. This flexible jaw-type shaft coupling is designed for exactly that application.
Each coupler is machined from aluminum alloy with a spider insert (jaw elastomer) that cushions shock loads and damps vibration. The outer diameter spans 18–19 mm (approximately 0.71–0.75 in) with a body length of 25 mm (approximately 0.98 in). Bore sizes range from 2 mm to 10 mm (approximately 0.08–0.39 in) on both input and output shafts, secured by set screws for tool-free adjustment. Available individually or in 10-piece packs for workshop stock.
Typical use cases include NEMA 17 / NEMA 23 stepper motor to lead-screw connections on CNC milling machines, Z-axis couplings on FDM 3D printers, and servo-to-shaft links on desktop laser cutters. The set-screw clamping style makes it straightforward to swap shafts during prototyping or maintenance without disassembling the entire drivetrain.
Dual set screws grip each shaft bore independently, allowing fast installation and removal without special tools — ideal for iterative prototyping and field maintenance.
Bore combinations from 2 mm × 2 mm up to 10 mm × 10 mm (including 6.35 mm / ¼ inch imperial sizes) cover the most common stepper motor and lead-screw shaft diameters in one product family.
The jaw-type elastomer spider absorbs shock loads and damps torsional vibration, reducing resonance noise and protecting downstream bearings and linear rails.
Lightweight yet rigid aluminum construction keeps rotational inertia low — critical for high-acceleration stepper motor applications where added mass causes missed steps.
The 18–19 mm outer diameter fits inside standard motor mounts and enclosures without clearance modifications, making drop-in replacement straightforward.
Order a single coupler for a one-off repair or a 10-piece pack to stock your workshop — both options are available across all bore size combinations.
| Product Type | Flexible Jaw Shaft Coupling (Set Screw Type) |
|---|---|
| Outer Diameter (D) | 18 mm or 19 mm (0.71 in / 0.75 in) — see variant options |
| Body Length (L) | 25 mm (0.98 in) |
| Bore d1 Range | 2 mm – 10 mm (including 2.3 mm, 3.17 mm, 6.35 mm) |
| Bore d2 Range | 2 mm – 10 mm (including 2.3 mm, 3.17 mm, 6.35 mm) |
| Clamping Method | Set screw (hex socket) |
| Body Material | Aluminum alloy |
| Insert Type | Elastomer spider (jaw type) |
| Finish | See variant options |
| Quantity Options | 1 Pcs or 10 Pcs per order |
| Applicable Shaft Types | Round shafts — metric and imperial (6.35 mm / ¼ in) |
| Typical Applications | CNC routers, 3D printers, laser engravers, stepper motor drives |
Measure the output shaft diameter of your stepper motor (d1) and the input shaft of your lead screw or driven component (d2). Select the variant that matches both values — for example, if your NEMA 17 motor has a 5 mm shaft and your T8 lead screw has a 8 mm shaft, choose the 5 mm × 8 mm bore option. Mixed metric/imperial combinations (e.g., 6.35 mm × 5 mm) are also available for US-standard motor shafts.
The outer diameter (D) refers to the overall body diameter of the coupler. D 18 mm variants are slightly more compact and suit tighter motor-mount clearances, while D 19 mm variants offer marginally more material around the bore for larger shaft diameters. Both share the same 25 mm body length and set-screw clamping design. Check your motor mount or enclosure clearance before selecting.
Yes. The jaw-type elastomer spider insert accommodates angular misalignment of typically up to 1°–3° and small amounts of parallel (radial) offset. It is not designed for large axial displacement. For best results, align shafts as closely as possible during installation — the coupling compensates for minor residual misalignment rather than replacing proper alignment practice.
The aluminum alloy body has inherent oxidation resistance suitable for typical indoor workshop and light-industrial environments. For prolonged exposure to moisture, salt spray, or aggressive chemicals, consider applying a thin coat of corrosion-inhibiting lubricant to the exterior. The elastomer spider insert is resistant to common oils and greases but should not be submerged in solvents.
Set screws apply point contact force to the shaft surface. For shafts with a flat (D-cut), align the set screw with the flat to maximize grip and minimize surface marking. On fully round shafts, tighten to the recommended torque for the screw size — over-tightening can indent soft shafts. Using a thread-locking compound (e.g., medium-strength Loctite) on the set screw threads helps prevent loosening under vibration without requiring excessive clamping force.
The 1-piece option is ideal for a single machine repair or build where you need one specific bore combination. The 10-piece pack offers a lower per-unit cost and is suited for workshop stock, batch machine builds, or situations where you anticipate future replacements. Both packs cover the same bore size combinations, so you can mix and match by ordering multiple variants in the quantity that suits your project.
Installation requires only a hex (Allen) key sized to the set screws — typically 1.5 mm to 3 mm depending on the screw size used. No press-fit tools, heating, or adhesives are required. Slide each shaft half into its respective bore, position the coupler at the desired axial location, and tighten the set screws alternately to ensure even clamping.
