Needle roller bearings from Western Bearing House
Needle roller bearings use long, thin rollers to give high radial load capacity in a very small cross-section. They suit applications where the housing bore must stay small, such as transmissions, hydraulic pumps and compact countershafts.
- Series
- 2
- Catalogued sizes
- 47
- Bore range
- 12–140 mm
- O.D. up to
- 190 mm
Typical applications
Engineering features
- Compact radial cross-section
- NA, 4900 and 6900 series
- High radial load capacity
- Metric sizes from 12 mm bore
- Hardness, dimensional and vibration tested
- AISI 52100 / 100Cr6 steel, 60–64 HRC
Technical specifications
Construction, standards and dimension range for needle roller bearings. Dimensions are converted to millimetres for inch series.
| Bearing type | Needle roller bearings |
|---|---|
| Designs and series | NA series with inner ring; 4900 and 6900 series |
| Catalogued sizes | 47 sizes in 2 series |
| Bore range (d) | 12–140 mm |
| Outside diameter (D) | 37–190 mm |
| Width range (B) | 20–63 mm |
| Measurement system | Metric sizes |
| Material | High-carbon chromium bearing steel, AISI 52100 / 100Cr6 |
| Hardness | Through-hardened, 60–64 HRC |
| Precision class | ISO 492 / DIN 620 Normal (P0), P6 and P5 |
| Radial clearance | C2, Normal, C3 and C4 |
| Cage | Pressed steel |
| Bore type | Cylindrical |
| Quality testing | Hardness, dimensional, runout and vibration testing of every bearing |
| Packing | Anti-corrosive VCI export wrapping |
| Typical applications | Automotive transmissions, Hydraulic pumps, Industrial countershafts, Compact gear drives |
Series overview
Every catalog series in this family. Select a series to open its full size and interchange table below.
| Series | Description | System | Sizes | Bore (d) | O.D. (D) | Width (B) | Catalog page |
|---|---|---|---|---|---|---|---|
| Needle roller bearings Series 4900 and 6900 | Metric | 27 | 45–140 mm | 68–190 mm | 22–63 mm | 87 | |
| Needle roller bearings NA series | Metric | 20 | 12–100 mm | 37–135 mm | 20–32 mm | 91 |
Size and interchange tables
Bearing numbers with their equivalents and dimensions from our catalog. Select any row for its technical drawing and full cross-reference.
| Bearing number and equivalents | Dimensions (mm) | Weight (kg) | ||
|---|---|---|---|---|
| Bearing no. | Bore d | O.D. D | Width B | |
| 4909 | 45 | 68 | 22 | – |
| 4910 | 50 | 72 | 22 | – |
| 4911 | 55 | 80 | 25 | – |
| 4912 | 60 | 85 | 25 | – |
| 4913 | 65 | 90 | 25 | – |
| 4914 | 70 | 100 | 30 | – |
| 4915 | 75 | 105 | 30 | – |
| 4916 | 80 | 110 | 30 | – |
| 4917 | 85 | 120 | 35 | – |
| 4918 | 90 | 125 | 35 | – |
| 4919 | 95 | 130 | 35 | – |
| 4920 | 100 | 140 | 40 | – |
| 4922 | 110 | 150 | 40 | – |
| 4924 | 120 | 165 | 45 | – |
| 4926 | 130 | 180 | 50 | 150 |
| 4928 | 140 | 190 | 50 | – |
| 6909 | 45 | 68 | 40 | – |
| 6910 | 50 | 72 | 40 | – |
| 6911 | 55 | 80 | 45 | – |
| 6912 | 60 | 85 | 45 | – |
| 6913 | 65 | 90 | 45 | – |
| 6914 | 70 | 100 | 54 | – |
| 6915 | 75 | 105 | 54 | – |
| 6916 | 80 | 110 | 54 | – |
| 6917 | 85 | 120 | 63 | – |
| 6918 | 90 | 125 | 63 | – |
| 6919 | 95 | 130 | 63 | – |
| Bearing number and equivalents | Dimensions (mm) | |||||
|---|---|---|---|---|---|---|
| SKF | FAG | RIV | NBC / Hoffmann | Bore d | O.D. D | Width B |
| NA 12 | NA 12 | – | NR 12 | 12 | – | – |
| NA 15 | NA 15 | – | NR 15 | 15 | – | – |
| NA 17 | NA 17 | AGn 17 | NR 17 | 17 | 37 | 20 |
| NA 20 | NA 20 | AGn 20 | NR 20 | 20 | 42 | 20 |
| NA 25 | NA 25 | AGn 25 | NR 25 | 25 | 47 | 22 |
| NA 30 | NA 30 | AGn 30 | NR 30 | 30 | 52 | 22 |
| NA 35 | NA 35 | AGn 35 | NR 35 | 35 | 58 | 22 |
| NA 40 | NA 40 | AGn 40 | NR 40 | 40 | 65 | 22 |
| NA 45 | NA 45 | AGn 45 | NR 45 | 45 | 72 | 22 |
| NA 50 | NA 50 | AGn 50 | NR 50 | 50 | 80 | 28 |
| NA 55 | NA 55 | AGn 55 | NR 55 | 55 | 85 | 28 |
| NA 60 | NA 60 | AGn 60 | NR 60 | 60 | 90 | 28 |
| NA 65 | NA 65 | AGn 65 | NR 65 | 65 | 95 | 28 |
| NA 70 | NA 70 | AGn 70 | NR 70 | 70 | 100 | 28 |
| NA 75 | NA 75 | AGn 75 | NR 75 | 75 | 110 | 32 |
| NA 80 | NA 80 | AGn 80 | NR 80 | 80 | 115 | 32 |
| NA 85 | NA 85 | AGn 85 | NR 85 | 85 | 120 | 32 |
| NA 90 | NA 90 | AGn 90 | NR 90 | 90 | 125 | 32 |
| NA 95 | NA 95 | AGn 95 | NR 95 | 95 | 130 | 32 |
| NA 100 | NA 100 | AGn 100 | NR 100 | 100 | 135 | 32 |
Source: Western Bearing House product guide, page 87.
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