SKF NKI 30/20 TN needle roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Needle roller bearing
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Description
SKF NKI 30/20 TN belongs to needle roller bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for NKI 30/20 TN and any equivalents.
Needle roller bearings in the SKF NKI TN range combine an inner ring with a plastic cage in a single-row radial design. They fit where radial room is tight but the load to be carried is significant, which is why they turn up in compact machinery across many industries. MR Industrial Accessories LLC supplies this line to customers in the United States and Latin America.
Reading the code tells you most of what you need. NKI means the bearing has an inner ring. The pair of numbers after the slash gives bore and width in millimeters, so NKI 5/12 TN runs on a 5 mm shaft and measures 12 mm wide. TN points to a polyamide cage, which keeps weight down and slides more freely than a metal one. Other sizes in the line include NKI 6/12 TN, NKI 6/16 TN, NKI 25/20 TN, NKI 28/20 TN, NKI 30/20 TN and NKI 30/30 TN.
Where do these bearings earn their place? Machine tools, pumps, compressors, transmissions and packaging lines are typical, since all of them work with limited radial space. The same logic applies to gearboxes, pulleys, linear motion equipment and industrial robots. Because the rolling elements are needles, the bearing handles substantial radial load within a low cross section, which is the main reason designers reach for this series instead of a wider ball bearing.
Selection comes down to three inputs: radial load, operating speed and the surrounding environment. The TN cage performs well at moderate temperatures, so hot-running applications may call for a different variant. Needles tolerate very little misalignment, so shaft and housing seats must be accurate and lubrication must be right from the start. How well you seal the arrangement depends on how much contamination is present.
Interchange is possible with needle roller bearings from other manufacturers that also use an inner ring and plastic cage, provided the dimensions and load rating line up. Tolerances and internal clearance still need checking before you commit. Send the part number from your drawing or the old bearing, and our team will confirm the match and suggest equivalents where needed.
To request a quote, message us on WhatsApp or by email with the code you need. We reply promptly and can help you confirm the right option for the application.
Dimensions
Dimensions and tolerances: Message us the part number on WhatsApp and we'll verify its dimensions and version with the manufacturer's datasheet.
Frequently asked questions
- What does the TN suffix indicate on an SKF NKI bearing?
- It identifies a plastic cage, typically polyamide. Compared with a metal cage, it lowers weight, slides more easily and suits higher speeds.
- How is an NKI bearing different from an NK bearing?
- NKI bearings include an inner ring; NK bearings do not. Having the inner ring makes mounting easier on shafts that have not been specially treated and can allow higher axial loads in certain arrangements.
- How do I pick the correct needle roller bearing for my equipment?
- Start with radial load, speed, the space available and the working environment, then check shaft and housing dimensions. If anything is unclear, send us the details and we will help you choose.