| Size SleeveX | Max. Bore d1 / d2 mm | Outer Dia D mm | Hub Outer D1 Dia mm | Total Length L mm | Sleeve Length L1 mm | Hub Length l1 / l2 mm | Space Betⁿ Hubs l3 mm | l4 | l5 | No. of Teeth | Extra Long Hub Length l1 / l2 mm |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M14 | 15 | 40 | 25 | 50 | 37 | 23 | 4 | 10 | 6.5 | 20 | 40 |
The M14 is engineered for tight spaces where reliable torque transmission and basic misalignment compensation are required. It features a slim profile with a 40 mm outer diameter and a standard length of 50 mm.
The following values are extracted directly from the technical data for the standard M14 configuration:
| Specification | Metric Value |
| Max Bore Capacity (d1 / d2) | 15 mm |
| Outer Diameter (D) | 40 mm |
| Hub Outer Diameter (D1) | 25 mm |
| Total Length (L) | 50 mm |
| Sleeve Length (L1) | 37 mm |
| Number of Teeth | 20 |
| Distance Between Hubs (l3) | 4 mm |
The M14 utilizes a multi-tooth design (20 teeth) to ensure smooth power delivery and reduced backlash.
Compact Footprint: With a total length of only 50 mm, it is ideal for small motor-to-pump connections or laboratory-scale equipment.
Hub Versatility: The standard hub length is 23 mm, but for applications requiring more shaft engagement, an Extra Long Hub variant is available with a length of 40 mm.
Precision Machining: The 15 mm maximum bore allows for precise fitment on small-frame NEMA or IEC motors.
Internal Clearances: It maintains a strict 4 mm spacing between hubs ($l3$) to allow for slight axial float and to prevent metal-to-metal contact during operation.
Given its dimensions and tooth count, the M14 is typically found in:
Small Centrifugal Pumps: Used in chemical dosing or coolant circulation.
Stepper/Servo Motor Drives: Providing a flexible link in automated machinery.
Conveyor Systems: For light-duty material handling where space is at a premium.
Encoder Couplings: Where high tooth counts (20) help maintain rotational accuracy.
Summary
The M14 is the foundational size of this series. While it lacks the massive torque capacity of the RRS 226, it offers the same reliability and "SleeveX" design benefits in a package optimized for 15 mm shafts and 40 mm clearances.
