NU Cylindrical Roller Bearings Comparison: 207 vs 317 vs 409
The NU 207 (bore 35 mm, OD 72 mm, width 17 mm), NU 317 (85x180x41 mm), and NU 409 (45x120x29 mm) serve light, medium, and heavy series cylindrical roller bearing applications across Indonesian industrial machinery. Performing an accurate NU cylindrical roller bearings comparison requires examining boundary dimensions, load capacities, and cage construction rather than assuming same-suffix interchangeability.
All three designations feature the classic NU design: an outer ring with two integral flanges and a smooth, flangeless inner ring[1][2]. This construction allows axial displacement of the shaft relative to the housing while carrying heavy radial loads in equipment operating from Surabaya to Cikarang.
What are the dimensions and series differences for NU 207, NU 317, and NU 409 bearings?
The NU 207 (bore 35 mm, OD 72 mm, width 17 mm), NU 317 (85x180x41 mm), and NU 409 (45x120x29 mm) serve light, medium, and heavy series cylindrical roller bearing applications. Bearing series numbers indicate load capacity tiers rather than size alone, meaning cylindrical roller bearings with matching double-digit suffixes are not interchangeable[1][2].
| Part Number | Bore (d) | Outside Diameter (D) | Width (B) | ISO Dimension Series | Typical Industrial Application |
|---|---|---|---|---|---|
| NU 207 | 35 mm | 72 mm | 17 mm | NU 200 (Light) | Electric motors, small gearboxes, light conveyors |
| NU 317 | 85 mm | 180 mm | 41 mm | NU 300 (Medium) | Heavy-duty reduction drives, mill rollers, pumps |
| NU 409 | 45 mm | 120 mm | 29 mm | NU 400 (Heavy) | High-impact crushers, severe load industrial machinery |
In standard ISO designations, the first digit following the NU prefix (2, 3, or 4) establishes the dimensional profile and load tier[1][3]. The NU 200 series provides a compact cross-section suited for high speeds and moderate radial loads. The NU 300 series expands the outside diameter and roller geometry for elevated radial capacity. The NU 400 series features a heavy cross-section built to withstand severe radial forces in mining and manufacturing plant operations in Jakarta or Medan.
A common misunderstanding among maintenance technicians is that bearings sharing a double-digit suffix share a bore size. While an NU 207 and NU 307 both feature a 35 mm bore (bore code 07 multiplied by 5), the NU 409 has a 45 mm bore (09 multiplied by 5)[1][3]. Suffix digits identify bore code within a family, not a cross-series dimension match. Explore our NU 207 product page for detailed profile specifications.
Parts in this article
| Part (bore x OD x width) | Variants | Price |
|---|---|---|
| NU 207 35 x 72 x 17 mm NU 200 Series | NU 207 ECP NU 207 EM | Ask today's price on WhatsApp |
| NU 317 85 x 180 x 41 mm NU 300 Series | NU 317 E NU 317 ECP NU 317 EM | Ask today's price on WhatsApp |
| NU 409 45 x 120 x 29 mm NU 400 Series | NU 409 | Ask today's price on WhatsApp |
| NU 307 35 x 80 x 21 mm NU 300 Series | NU 307 ECP NU 307 EM | Ask today's price on WhatsApp |
Are NU series bearings interchangeable, and how do you select the correct variant?
NU series bearings with identical dimensions are not automatically interchangeable across different internal cage specifications or series classes. Selecting the correct variant requires matching both the physical envelope and the specific material suffix to your operating conditions.
HI-TEC SILVER supplies verified variants including NU 207 ECP, NU 207 EM, NU 317 E, NU 317 ECP, and NU 317 EM. These suffix codes denote critical internal optimizations and cage construction[1][3]:
- E / EC Designators: Indicate an optimized internal geometry with larger or extra rollers for increased radial load rating[1][2].
- ECP Suffix: Combines the optimized internal design with a glass-fibre-reinforced polyamide 66 (PA66) polymer cage[1][3]. Polymer cages offer low friction and quiet operation in standard temperature ranges.
- EM / E Variant: Features a heavy-duty machined brass cage[1][3]. Brass cages handle extreme operating temperatures, aggressive synthetic lubricants, and severe shock loads in heavy processing plants.
Substituting an ECP polymer variant into a high-heat application requiring an EM brass cage often leads to premature failure and costly machine downtime. Learn more about internal design variations in our guide on the difference between N NU and NJ bearings.
HI-TEC provides part verification, current pricing, and stock availability for NU series bearings via WhatsApp at +62 823-1004-6527. Contact our team to confirm your exact part designation before ordering.
Need a price? Ask HI-TEC Asia on WhatsApp Send the part number (NU 207, NU 317, NU 409, or any other) to ask for today's price and availability. Open WhatsApp |
Frequently Asked Questions
What are the exact dimensions of NU 207, NU 317, and NU 409 cylindrical roller bearings?
The NU 207 features a 35 mm bore, 72 mm outside diameter, and 17 mm width. The NU 317 measures 85x180x41 mm, while the NU 409 has a 45 mm bore, 120 mm outside diameter, and 29 mm width.
What is the difference between NU 200, NU 300, and NU 400 series bearings?
The numbers 2, 3, and 4 represent ISO dimension series for light, medium, and heavy load capacities. NU 300 and NU 400 series bearings have larger outside diameters and thicker rollers than NU 200 bearings of equal bore size.
Are cylindrical roller bearings with the same suffix interchangeable across series?
No, bearings from different series (such as NU 207 vs NU 407) are not interchangeable. They have different outside diameters, widths, and load ratings even when their double-digit bore codes match.
Where can I inquire about pricing and availability for HI-TEC SILVER NU bearings?
You can request instant part verification, pricing, and stock availability for HI-TEC SILVER NU series bearings directly from HI-TEC ASIA via WhatsApp at +62 823-1004-6527.
References
- [PDF] Bearing Handbook for Electric Motors - SKF. https://cdn.skfmediahub.skf.com/api/public/0901d19680056c36/pdf_preview_medium/140-430_Bearing_EM_Handbook_Nov_2020_pdf_preview_medium.pdf (2026-07-15)
- NU 2340 ECML - Cylindrical roller bearings. https://www.skf.com/ng/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings/single-row-cylindrical-roller-bearings/productid-NU%202340%20ECML?failover=true (2026-10-01)
- Basic bearing designation system. https://www.skf.com/us/products/rolling-bearings/principles-of-rolling-bearing-selection/general-bearing-knowledge/bearing-basics/basic-bearing-designation-system (2026-10-30)