Precision Rollers
Choosing the right roller
Heavy Duty Industrial Rollers
At Atlas Ball & Bearing, we supply a wide range of heavy-duty rollers engineered for demanding environments. Designed to provide superior load-bearing capacity and wear resistance, our rollers are used across numerous industries including automotive, aerospace, energy, and manufacturing.
As rolling elements in bearings and assemblies, industrial rollers offer excellent durability, precision, and load distribution. Their cylindrical shape provides a larger contact surface than balls, making them ideal for high-load or high-pressure applications.
Cylindrical Rollers
Available with flat ends (either ground or unground) and with either a straight or logarithmic (crowned) end.
Rollers
Steel Rollers
Rollers are usually manufactured in chrome steel (UNI 100Cr6) but can also be produced to special order in:
- AISI S2
- M2 Tool Steel
- Hardness 58-65 HRc
The standard hardness for chrome steel rollers is HRc 58-65 (653 – 832Hv10), which indicates a high level of hardness.
This hardness range is ideal for applications that demand superior wear resistance and load-bearing capacity, such as bearings, conveyor systems, and precision machinery. Rollers with this hardness can endure continuous, heavy-duty usage without deforming, ensuring long-term performance.
Rollers
Stainless Steel Rollers
We also offer rollers produced in stainless steel alloys for applications requiring corrosion resistance and durability:
- AISI 302
- AISI 316
- AISI 420
Rollers
Needle Rollers
Form A
Also known as NRA or TB
Form B
Also known as NRB or TT
| DIMENSIONAL AND GEOMETRICAL ACCURACY | |||||
|---|---|---|---|---|---|
| Deviations and tolerances for diameter | Length tolerance limits | ||||
| Grade | Maximum Diameter Tolerance (µm) |
Gauge Division (µm) |
Roundness (µm) |
Surface Finish (µm) |
See table below |
| G2 | +0 ~ -2 | 2 | 1 | 0.1 | h13 |
| More details about Grade G2... | |||||
| G5 | +0 ~ -5 | 5 | 2 | 0.2 | h13 |
| More details about Grade G5... | |||||
| LENGTH TOLERANCES (mm) | |||
|---|---|---|---|
| Over | Up to | h13 | |
| - | 6 | +0 | -0.180 |
| More details about the range “- to 6 mm”... | |||
| 6 | 10 | +0 | -0.220 |
| More details about the range “6 to 10 mm”... | |||
| 10 | 18 | +0 | -0.270 |
| More details about the range “10 to 18 mm”... | |||
| 18 | 30 | +0 | -0.330 |
| More details about the range “18 to 30 mm”... | |||
| 30 | 50 | +0 | -0.330 |
| More details about the range “30 to 50 mm”... | |||
Where no grade is specified when ordering, Atlas will supply NRA G5 with a diameter tolerance of +0 ~ -5µm.
Sample our work
Where appropriate we can supply detailed technical data and samples for testing/evaluation by the customer prior to bulk supply or manufacture.
Rollers
Cylindrical Rollers
These are flat-ended rollers and generally have a length that is one to three times the diameter.
The diameter size range available is from 2.5mm (0.0984″) to 70mm (2.7559″), with lengths ranging from 4mm (0.1575″) to 70mm (2.7559″).
The main use for cylindrical rollers is in bearings, with other uses including automotive seat slides and rockbit drills.
Rollers normally conform to the tolerances shown below.
| DIMENSIONAL AND GEOMETRICAL ACCURACY | |||||
|---|---|---|---|---|---|
| Grade | Diameter Tolerance (µm) | Roundness (µm) | Surface Finish (µm) | Ground Ends (µm) | Unground Ends (µm) |
| G2 | +0 ~ -2 | 2 | 1 | 0.1 | h13 |
| More details about Grade G2... | |||||
| G5 | +0 ~ -5 | 5 | 2 | 0.2 | h13 |
| More details about Grade G5... | |||||
| LENGTH TOLERANCES (mm) | |||
|---|---|---|---|
| Over | Up to | + Tolerance | - Tolerance |
| - | 6 | +0 | -0.180 |
| More details about range “- to 6 mm”... | |||
| 6 | 10 | +0 | -0.220 |
| More details about range “6 to 10 mm”... | |||
| 10 | 18 | +0 | -0.270 |
| More details about range “10 to 18 mm”... | |||
| 18 | 30 | +0 | -0.330 |
| More details about range “18 to 30 mm”... | |||
| 30 | 50 | +0 | -0.330 |
| More details about range “30 to 50 mm”... | |||
Whilst the standard cylindrical rollers have a straight profile, they are available with a crowned or logarithmic profile, details upon request.
Cylindrical Spindles
These are long rollers that are used as pins or dowels, or as shafts in micro electric motors. The diameters available are from 2mm (0.0787″) through to 8mm (0.3149″), with lengths from 10mm (0.3937″) through to 100mm (3.937″).
Sample Our Work!
Take the first step towards precision and quality with our expert services. At Atlas Ball & Bearing, we’re committed to delivering top-notch precision balls and rollers for a wide range of industries, including gas, oil, medical, and transportation. Our dedicated team is ready to assist you with custom solutions tailored to your specific needs. Experience the Atlas Ball & Bearing difference now!