Rollers

Atlas supply many types of rollers, for use in a wide variety of applications. The main types of roller are as follows:

Needle Rollers - available with either round or flat ends

Cylindrical Rollers - available with flat ends (either ground or unground) and with either a straight or logrithmic (crowned) profile.

Cylindrical Spindles - available with round or flat ends

Materials - rollers are usually manufactured in Chrome steel (UNI 100Cr6) but can also be produced to special order in:
AISI S2 and M2 Tool Steel
Stainless steel AISI 302, AISI 316 and AISI 420

Hardness - Chrome steel rollers are manufactured to a hardness of HRc 58 - 65 (653 - 832Hv10)

AVAILABLE
MATERIALS

CHROME ALLOY

STAINLESS ALLOYS

TOOL STEEL ALLOYS

Needle Rollers

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Needle rollers have a small diameter (1mm to 6mm) with a length of more than 3 times the diameter.
Their main use is as rolling elements in bearings where they are particularly useful when space is limited and a high radial load is required. They are also useful as locating pins and mini-shafts.

The following diagram shows end shapes/profile

Form A also known as NRA or TB	Form B also known as NRB or TT

CLICK FOR STANDARD SIZE AND WEIGHT CHART

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 ~ -10	2	1	0.1	h13
G5	+0 ~ -10	5	2	0.2	h13

LENGTH TOLERANCES (mm)
Over	Up to	h13
-	6	+0	-0.180
6	10	+0	-0.220
10	18	+0	-0.270
18	30	+0	-0.330
30	50	+0	-0.330

Where no grade is specified when ordering, Atlas will supply NRA G5 with a diameter tolerance of +0 ~ -5µm

Cylindrical Rollers
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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, other uses include automotive seat slides and rockbit drills.
Rollers normally conform to the tolerances shown below.

DIMENSIONAL AND GEOMETRICAL ACCURACY
Deviations and tolerances for diameter				Length tolerance
Grade	Diameter Tolerance µm	Roundness µm	Surface Finish µm	Ground Ends µm	Unground Ends µm
G 2	(< 26mm) 2µm	1	0.1	<15mm +0 ~ -30 >16mm +0 ~ -50	+0 - 200
	(26mm ~ 60mm) 3µm	1.5
G 5	5µm	2	0.2	+0 ~ -50	h13 (See table above)

Whilst the standard cylindrical rollers have a straight profile, they are available with a crowned or logarithmic profile, details upon request

Cylindrical Spindles

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These are long rollers which 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").

Further information is available upon request.

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