Rollers - Materials & Dimensions

Rollers are offered by ICT mostly in the dimensional range from 4 mm up to 160 mm of diameter (indeed for needles and pins it is possible to offer also smaller diameters, from 0.8 mm). Besides 100Cr6 steel and Chrome Manganese steel (for rollers larger than 40 mm of diameter), it’s possible to order also plenty of other materials: all stainless steels, many types of plastics, ceramics and many others. Just get in touch with us at info@consulting-trading.com or through the contact form below to confirm the availability and get the quote.

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Chrome Steel Cylindrical Rollers & Pins

100Cr6, i.e. the chrome steel used for bearings application, is the most widely used material for rollers and is also known as 52100 or SUJ2 steel. The steel sources that ICT uses guarantee very fine-grain martensitic microstructure, which allows high hardness and exceptional wear and fatigue resistance properties. For rollers diameter larger than 40 mm, the steel is 100CrMn6 in order to guarantee better heat treatment properties up to the core of the product and, at the end, superior performances in application.

Our chrome steel cylindrical rollers are widely used worldwide in various applications, from bearings to ball screws, from constant velocity joints to check valves, from automotive steering to seating systems, just to mention few. The precision we offer allows to use them in very high speed applications.

ICT cylindrical rollers are available both with profile TR and ZB, sorted in groups of 1 micron each or packed by plastic tube-packaging concept, keeping exactly the same production sequence as from the last lapping operation.

Specifically in the larger products range (from 14 to 160 mm of diameter), through its own partner ICT can produce more than 10 million finished rollers per year, using exclusively steel sources of extreme high quality like Ovako, Sanyo Special Steel, Timken and Dongbei Special Steel. Furthermore the special manufacturing process allows to serve the market with lead-times of only 40 to 50 days that, in cases of urgency, can be reduced to 2 or 3 weeks. However, we offer also service through consignment stocks in all continents, providing just-in-time policy to our customers.

We can always support to chose the best fit products for your own needs. Just get in touch with us directly at info@consulting-trading.com or through the format “Request a Quote” to explain your needs.

Cylindrical rollers precision classes

The standard GB/T 4661-2002 defines the geometrical properties of cylindrical rollers and classifies them in 4 different classes, from class 0 to class III (being class 0 the most accurate one). The ISO 683-17 norm defines the classes from G2 to G5, being the G2 the most accurate one.

ICT can offer rollers in class 0 or G2 (and worse ones), i.e. with max ovality lower than 1 micron, Ra lower than 0.1 micron and with interval gauging of diameters in 1 micron steps and of lengthes in 6 microns steps (up to 30 mm diameter).

ICT can provide also cylindrical rollers according to DIN 5402 standard.

Pins

The offer of pins is mostly in 100Cr6 steel with sizes that range from 3×10 up to 6×100 mm, both of type M6 and H6. In these cases the max roundness error is 1.5 micron, while the max Ra is 0.15 micron. They are conforming to norm DIN 6325. Also inch sizes are available upon request.

ICT pins are produced with both ends rounded and are widely used in steel construction, bridges and engines. Just get in touch with us directly at info@consulting-trading.com or through the format “Request a Quote” to explain your needs.

Chrome Steel Taper Rollers

Taper rollers of ICT ranges in the diameters from 5 to 160 mm and in lengthes from 6 to 280 mm, with radius end face that are included between a minimum of 44 up to a max of 1800 mm.

Also in this case the most common type of steel is bearings chrome steel, 100 Cr6. However, for dimensions larger than 40 mm the chrome Mn steel is used in order to enhance the temprability properties of the material and to guarantee an uniform microstructure in the whole section of rollers (from surface to core).

Most of these rollers are custom designed for each customer, satisfying very high standards of precision. This allows the taper rollers to facilitate smooth rotation of bearings, to reduce starting torque and to contribute to make longer the life of end products. Among the final applications, let’s here recall the automotive (e.g. suspension hubs, engines, transmission, etc.) and industrial machinery components (e.g. speed reducers, motors, cam followers).

In the whole dimensional range, ICT can offer ovality error less than 1 micron, end face roughness Ra less than 0.25 micron and diameter sorting tolerances betweeen 1 and 4 micron.

Taper rollers precision classes

The standard GB/T 10235-2001 defines the geometrical properties of taper rollers and classifies them in 4 different classes, from class 0 to class III (being class 0 the most accurate one). The ISO 683-17 norm defines the classes from G2 to G5, being the G2 the most accurate one.

ICT can offer rollers in class 0 or G2 (and worse ones), i.e. with max ovality lower than 1 micron, Ra lower than 0.04 micron and with interval gauging of diameters in 1 micron steps. Upon customer request, taper rollers can be provided by plastic tube packing in the same output sequence from the last lapping operation, in order to minimize the diameter spread in the bearings assembly.

ICT can provide also cylindrical rollers according to DIN 5402 standard.

Logarithmic profile

The cross-section of roller profile controls the pressure distribution in the contact area and radically affects the roller bearings basic dynamic load rating and rating lives. The most critical areas – where excessive pressure peaks may occur – are at the ends, where edge loading may happen. Logarithmic profile of roller (developed by Lundberg and improved by John-Gohar) has a continuous evolution with no discontinuities till the intersection with end fillet. Its ultimate target is to minimize the material stresses in the roller raceway contact.

ICT can offer both cylindrical and taper rollers with reliable logarithmic profile and enhanced performances in the most stressed applications.

Chrome Steel Spherical Rollers

Spherical rollers of ICT ranges in the diameters from 8 to 160 mm and in lengthes from 8 to 160 mm, with radius end face that are included between a minimum of 44 up to a max of 1800 mm.

Most of these rollers are custom designed for each customer, satisfying very high standards of precision. This allows the spherical rollers to facilitate smooth rotation of bearings, to reduce starting torque and to contribute to make longer the life of end products. Among the final applications, let’s here recall gearboxes, wind turbines, continuous casting machines, pumps, mining and costruction equipments, pulp and paper processing equipments.

In the whole dimensional range, ICT can offer ovality error less than 2 micron, end face roughness Ra less than 0.25 micron and diameter sorting tolerances betweeen 2 and 5 micron.

Chrome Steel Needles

The cylindrical needle rollers can be offered in version NRA (i.e. with both ends rounded) and in version NRB (i.e. with parallel end faces). Both solutions are available in different materials, from 100Cr6 to all types of soft and hard stainless steels, in the following dimensional range:

Diameter form 1 to 6 mm;
Length from 3.8 to 49.8 mm.

ICT needles are used in full complement bearings, epyciclic gear reduction units, universal joint crosses and rotating elements in general, they can be sorted in groups of 1 micron and – upon request – they can be supplied with logarithmic profile.

Stainless Steel Cylindrical Rollers & Others

Our offer of stainless steel rollers cover multiple types of materials.

Rollers in AISI 304/302 steel are dedicated to those applications whose conditions require corrosion and toughness performances not available in hardenable stainless steels. Exemple of applications are couplings, valves and pumps

AISI 316 stainless steel rollers have exceptional corrosion resistance thanks to their higher nickel and molybdenum content. Developed to resist in contact with sulphuric, phosphoric and acetic acid, they are extensively used in applications involving photographic chemicals, inks, rayon, rubber, textile bleaches, dye stuffs and high temperature equipments. Examples of such applications are medical, health and beauty aid, food and beverage parts and assemblies.

AISI 420 steel rollers show good wear characteristics, high hardness and excellent resistance to corrosion from mild atmospheres, fresh water, steam, blood, ammonia, petroleum products and mild acidic environments.

Rollers in AISI 430 steel offer good resistance to mild atmospheric conditions, steam, dairy products, nitric acid and many petroleum products and organic materials, and provide superior resistance at elevated temperatures compared to AISI 302 or 304 or 316 materials. Rollers in this steel are passivated.

Rollers in AISI 440C steel provide maximum hardness, toughness and dimensional stability. After heat treatment process, they reach high values of hardness that allow excellent properties of resistance to rolling-contact fatigue. Excellent is also the resistance to mild acids, alkalis, food, fresh water and air. They are passivated to remove free iron contaminants and to facilitate spontaneous formation of a protective passive film. They are widely used in rolling bearings, actuators and pumps.

AS special rollers, ICT can offer both cylindrical and taper hollow rollers, in a variety of materials, diameters and profiles according to the customer specifications.

For any inquiry or request of info just get in touch with us directly at info@consulting-trading.com or through the “Request a Quote” format to explain your needs.

Ceramic Rollers

Silicon nitride rollers are used in high technology industries such as aerospace and defense, inside hybrid bearings and full ceramic bearings. Main features are the excellent corrosion resistance from chemicals and other demanding environmental conditions, the reduced density that minimize centrifugal force, skidding and wear under high speed and acceleration, the resistance to fatigue of around 10 times more than in chrome steel products, the electric insulation properties and capability to resist very high temperatures. They areboth used in all-ceramic bearings and in hybrid ceramic bearings. Specifically in hybrid roller bearings, weight is lighter than conventional bearings and operational speed is higher, with less friction and less lubrication need. Since the silicon nitride rollers are totally inert due to their covalently bonded crystalline structure, there is absolutely no possibility of seizure, fretting, cold welding or adhesive wear between the rolling elements and metal raceways even in “oil-off” situations.

Zirconia oxide rollers have the highest strength and toughness at room temperature of all the advanced ceramic materials. Therefore when a superior load bearing capability is required in the application, zirconia oxide roller is the optimal solution.

ICT can offer ceramic rollers in the dimensional range from 3 to 40 mm of diameter and with design according to customers’ drawing.

For any inquiry or request of more info, just get in touch with us directly at info@consulting-trading.com or through the “Request a Quote” format to explain your needs.