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Brand: NSK
NSK N1010MRKR Super Precision Cylindrical Roller Bearing
Description
A super precision cylindrical roller bearing for machine tool spindles
The NSK N1010MRKR is a single-row cylindrical roller bearing of the NSK super precision range, with a 50 mm bore, 80 mm outside diameter and 16 mm width. NSK notes that cylindrical roller bearings have higher radial rigidity and can take higher radial loads than ball bearings, which makes them especially suitable for applications that need high rigidity such as lathe spindles, and for the rear end bearing carrying large belt loads. The tapered bore (KR) lets the spindle builder set the radial clearance or preload by driving the inner ring up the shaft taper, and the roller-guided brass cage (MR) suits high speed. The optimised internal design and cage shape of the series are described as giving low heat generation and stable running at high speed.
Technical specifications
| Parameter | Specification |
|---|---|
| Designation | N1010MRKR: N = single-row cylindrical roller bearing (outer ring without ribs), 10 = dimension series 10, 10 = 50 mm bore, MR = roller-guided brass cage, KR = tapered bore |
| Bore d / outside D / width B | 50 mm / 80 mm / 16 mm |
| Chamfer r / r1 (min.) | 1 mm / 0.6 mm |
| Roller set outer diameter Ew | 72.5 mm |
| Basic dynamic load rating Cr | 37.0 kN |
| Basic static load rating C0r | 36.0 kN |
| Limiting speed, grease / oil | 13,000 rpm / 20,000 rpm |
| Axial displacement s | 2.0 mm |
| Mass (approx.) | 0.286 kg |
| Bore | Tapered (KR); radial clearance codes CC9, CC0 and CC1 apply to tapered-bore bearings |
| Cage | MR: roller-guided brass cage |
Size table for the NSK N10 series with brass cages
Rows are the brass-cage MR variants of the N10 series from the NSK super precision cylindrical roller bearing table; NSK also lists RS and RX ultra-high-speed versions with polymer cages in the same table.
| Designation | d mm | D mm | B mm | Cr kN | C0r kN | Ew mm | Grease rpm | Oil rpm | Mass kg |
|---|---|---|---|---|---|---|---|---|---|
| N1006MR1KR | 30 | 55 | 13 | 19.7 | 19.6 | 48.5 | 19,000 | 31,000 | 0.135 |
| N1007MRKR | 35 | 62 | 14 | 26.0 | 23.2 | 55 | 17,000 | 27,000 | 0.172 |
| N1008MRKR | 40 | 68 | 15 | 31.5 | 29.0 | 61 | 15,000 | 25,000 | 0.213 |
| N1009MRKR | 45 | 75 | 16 | 37.5 | 35.5 | 67.5 | 14,000 | 22,000 | 0.279 |
| N1010MRKR | 50 | 80 | 16 | 37.0 | 36.0 | 72.5 | 13,000 | 20,000 | 0.286 |
| N1011BMR1KR | 55 | 90 | 18 | 43.5 | 44.0 | 81 | 12,000 | 18,000 | 0.425 |
| N1012BMR1KR | 60 | 95 | 18 | 46.0 | 48.5 | 86.1 | 11,000 | 17,000 | 0.454 |
| N1013BMR1KR | 65 | 100 | 18 | 47.0 | 51.0 | 91 | 10,000 | 16,000 | 0.483 |
| N1014BMR1KR | 70 | 110 | 20 | 57.5 | 63.0 | 100 | 9,000 | 15,000 | 0.668 |
Designation and use
The numbering system starts with the bearing type (N), dimension series and bore number, where the bore equals the bore number times 5 in millimetres. Then follow material (no code: SUJ2 bearing steel; RS and RX: the NSKROBUST ultra-high-speed versions, with RX using heat-resistant steel), the cage code (MR roller-guided brass, TP outer-ring-guided PEEK), the tapered bore code KR, the radial clearance and the accuracy class. Cylindrical roller bearings of the N type have no ribs on the outer ring side and so act as free-end bearings that allow axial displacement of the shaft, as the table value s shows, and they are normally paired with an angular contact bearing set that locates the spindle.
Spindle bearings must be fitted with a measured clearance: the table lists the clearance reduction achieved by the tapered-bore fit and the measured residual clearance classes. Handle with clean tools and do not mix inner and outer rings of different bearings unless the maker specifies interchangeability. For other bearing types see Electric Motors, Pumps and Turbines.
Documents and quotation
State the full designation, cage, bore type, radial clearance class, accuracy class and lubrication method (grease, oil-air or oil mist). The attached PDF is a page extract from the NSK Super Precision Bearings catalogue (Cat. No. E1254) with the cylindrical roller features, the numbering system and the N10 table for bores of 30 to 70 mm. Seven Star LLC is an independent supplier in Muscat; availability and lead time are confirmed per enquiry.
Datasheets & Documents
- Catalog NSK Super Precision Bearings E1254 - extract: single-row cylindrical roller bearings, numbering system and N10 table Download
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About brand
NSK is a Japanese manufacturer of bearings and motion and control components and the largest bearing maker in Japan. The company was founded in Tokyo in 1916, when it also produced its first bearings, and it was the first company to make ball bearings in Japan. NSK Ltd. is headquartered in Shinagawa, Tokyo, and listed on the Tokyo Stock Exchange.
Seven Star LLC is an independent supplier in Muscat. We list NSK catalogue bearings for maintenance teams, workshops and machine builders in Oman and the GCC.
NSK company profile
| Founded | 1916, Yurakucho, Tokyo, Japan (predecessor partnership 1914) |
|---|---|
| Headquarters | Ōsaki, Shinagawa, Tokyo, Japan |
| Ownership | Public company, Tokyo Stock Exchange |
| Distinction | First manufacturer of ball bearings in Japan |
| Product families | Deep groove and angular contact ball bearings, cylindrical, tapered and spherical roller bearings, super-precision machine tool bearings, linear guides and ball screws, automotive components |
Milestones
- 1914: The predecessor partnership is set up in Tokyo.
- 1916: NSK is founded and produces its first bearings.
NSK product series
Ball bearings on this site include the 608 extra small and 6208DDU deep groove bearings, the 7208A single-row and 5206 double-row angular contact bearings, the 7304AWDT matched pair, the QJ210 four-point-contact bearing, the BL210 maximum-type bearing, the 51208 single-direction and 52208 double-direction thrust ball bearings and the 30TAC62C ball screw support bearing. Roller bearings include the HR30210J tapered roller bearing and the NU210EW cylindrical roller bearing.
Super precision bearings include the 70BNR10H NSKROBUST angular contact bearing and the N1010MRKR cylindrical roller bearing for machine tool spindles, and the UCP208D1 pillow block unit covers housed bearings.
Where NSK bearings are used
Electric motors, pumps, fans and gearboxes, conveyors, machine tool spindles and ball screw drives, and general industrial machinery. Each product page quotes dimensions, load ratings and limiting speeds as printed in the NSK catalogue.
NSK products we list
Ordering NSK bearings: what we need
Give the complete designation marked on the bearing, including prefix and suffix letters such as seal, cage, clearance and precision codes. If the marking is worn, measure bore, outside diameter and width and tell us the machine and shaft position, the operating speed and the lubrication. State the quantity and any precision class or special clearance required.
Facts checked against NSK's own company history (nsk.com), October 2026.
Browse NSK products by category: Ball Bearings.
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Frequently Asked Questions
What is the NSK N1010MRKR?
It is a single-row super precision cylindrical roller bearing with a 50 mm bore, a roller-guided brass cage and a tapered bore, used in machine tool spindles.
What does KR mean in the designation?
KR denotes a tapered bore in the NSK numbering system for these bearings. Radial clearance in tapered-bore bearings is set by the fit on the shaft taper.
What are the ratings and speeds?
Cr is 37.0 kN and C0r is 36.0 kN. Limiting speeds are 13,000 rpm with grease and 20,000 rpm with oil.
Can it locate the shaft axially?
The N type allows axial displacement of up to 2.0 mm in the table, so it acts as a free-end bearing; an angular contact set normally locates the shaft.
Are higher-speed versions available?
NSK lists RS and RX ultra-high-speed single-row types with PEEK cages in the same table, with grease limits up to 21,000 rpm for the 45 mm bore RX.
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