16mm Ballnut Variant 3 pitch 4,0mm (213514)

The ISEL variant 3 ball screw nut is a special type. You have to pay close attention when you want to buy this. The nut can only be used together with the mounting block tension block 1 or 2. Or you have to make a mounting block yourself. Without the blocks, the nut has no pre-tension and cannot be used. The nice thing about this nut is that seals can also be mounted in it to keep dust and dirt out. Furthermore, it is the only ball screw nut that is really available in every pitch. 2.5mm 4mm 5mm 10mm and 20mm.

This model ball screw nut with a pitch of 4mm is a popular choice, and often also a safe choice. Suppose you have a NEMA 23 stepper motor with 2 Nm torque, then it generates approximately 2826 Newton (approximately 288 kg) force. If you use the same stepper motor with a pitch of 2.5mm, then you generate almost double the force. That is 4522 Newton (approximately 460kg). The tricky part is that you are already exceeding the dynamic load rating of 3500 Newtons that is permitted for these ball screw nuts (see image 4). We would rather go for a pitch of 4 or 5 mm. Because then you are much further from the limits of what the nuts can handle and that is why this nut with a pitch of 5 mm is often a good choice. Another advantage is that the dynamic load rating of 4600 Newtons is more than the 3500 Newtons of the pitch of 2.5 mm. Suppose you were to use even heavier stepper motors. Then you can get the force down again by going to an even larger pitch. A pitch of 10 mm and 20 mm also exists in Variant 3 from ISEL. This is often done to generate machine with a higher feed rate.

Component features:

• Ball screw Diameter: 16mm
• Pitch: 4mm
• Dynamic load: 4600N
• Static load: 7200N
• External diameter: 28h7
• Length: 50mm
• ISEL part number: 213514
• NOTE: different brands such as HIWIN & ISEL are not interchangeable