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When a misaligned or slipping shaft coupling derails your CNC router, 3D printer, or stepper motor drive system, every axis of movement suffers. The D16L20 flexible shaft coupling is engineered for makers, machine builders, and automation engineers who need a compact, reliable connector between motor and lead screw shafts without the rigidity that causes binding or bearing wear.
This jaw-style flexible coupling features an aluminum alloy body with an elastomeric spider insert, spanning an outer diameter of 16mm and a body length of 20mm (approx. 0.63 × 0.79 in). Bore hole combinations range from 2mm to 6.35mm (approx. 0.079–0.250 in) for d1 and d2, covering the most common NEMA 17, NEMA 23, and metric lead screw shaft diameters. Available in packs of 1, 5, 10, or 20 pieces.
Typical use cases include CNC router Z-axis coupling between stepper motor and ball screw, 3D printer flexible shaft coupling for Z-lead screw drives, and DIY linear actuator builds requiring a stepper motor coupler connector with angular misalignment tolerance.
Spider insert absorbs vibration and accommodates angular and parallel misalignment, protecting motor bearings and extending drivetrain life.
27 hole-size combinations cover NEMA 17 (5mm), NEMA 23 (6.35mm), and common metric lead screw shafts — select d1 × d2 to match your exact setup.
Lightweight yet rigid outer hubs resist deformation under torque, maintaining concentricity across repeated motion cycles.
Available in 1, 5, 10, or 20-piece quantities — stock up for multi-axis machines or workshop inventory without overpaying per unit.
Set-screw clamping on both hubs allows quick shaft changes during prototyping or maintenance without disassembling the drive system.
Tight hub-to-spider fit minimizes rotational play, keeping positional accuracy consistent in CNC and 3D printing applications.
| Coupling Type | Jaw / Spider Flexible Coupling |
|---|---|
| Outer Diameter (D) | 16mm (0.63 in) |
| Body Length (L) | 20mm (0.79 in) |
| Bore d1 (Motor Shaft) | See variant options |
| Bore d2 (Lead Screw Shaft) | See variant options |
| Bore Range | 2mm – 6.35mm (0.079 – 0.250 in) |
| Hub Material | Aluminum Alloy |
| Insert Material | Elastomeric Spider (Polyurethane) |
| Clamping Method | Set Screw |
| Finish | See variant options |
| Pack Quantity | 1 / 5 / 10 / 20 pcs (see variant options) |
| Compatible Motors | NEMA 17, NEMA 23, and equivalent metric stepper motors |
Measure your motor shaft diameter (d1) and your lead screw or driven shaft diameter (d2) with a caliper. Select the variant that matches both values exactly. Common pairings: NEMA 17 motors typically use a 5mm shaft; NEMA 23 motors typically use a 6.35mm shaft. Lead screws vary — check your screw spec sheet before ordering.
Yes. The jaw-style spider insert accommodates angular misalignment (typically up to 1°) and small amounts of parallel offset. It is not designed for large misalignments — always align shafts as closely as possible during installation to maximize coupling life and minimize vibration.
The aluminum alloy hubs offer moderate corrosion resistance. For prolonged outdoor or high-humidity use, applying a light protective coating to the hubs is recommended. The polyurethane spider insert is moisture-resistant under normal operating conditions.
The D16L20 jaw coupling is rated for low-to-medium speed CNC and 3D printing applications, typically up to 1,000–3,000 RPM depending on load. Torque capacity varies by bore size and spider durometer. For high-torque or high-speed industrial applications, contact us to confirm suitability before ordering.
This coupling fits any machine where the motor shaft and lead screw shaft diameters fall within the 2–6.35mm bore range offered. It is widely used in DIY CNC routers, laser engravers, and FDM 3D printers with lead screw Z-axes. Check your machine's shaft specs and select the matching d1 × d2 variant.
The spider insert in jaw couplings is a wear item and can typically be replaced without replacing the aluminum hubs. Standard D16 spider inserts are widely available. If you need replacement inserts, contact us for compatibility guidance.
Multi-axis CNC machines and 3D printer farms require multiple couplings per build. Buying in bulk reduces per-unit cost and ensures you have spares on hand for maintenance. The 5-pack and 10-pack options are popular for workshop stock, while the 20-pack suits production or multi-machine setups.
