GRW precision bearings and spindle components

GRW precision bearing assemblies: radial 600 series, angular contact spindle units, duplex sets, miniature dental bearings, and automated testing benches.

GRW 600, 6000 and SS series precision radial deep groove ball bearings

Single-row radial ball bearings of GRW 600, 6000, and SS lines are manufactured according to DIN/ISO and ANSI/AFBMA standards. Precision ground raceways and micro-finished rolling elements minimize rotational friction torque alongside vibration levels in high-speed drives and spindle supports.

Precision tolerance grading meeting ABEC 5, ABEC 7, and ABEC 9 industrial classes
Material grades including SS stainless alloys and vacuum degassed 100Cr6 steels
Metallic non-contact shields Z alongside synthetic rubber 2RS contact ring seals
Retainer options fabricated from phenolic resin, PEEK polymer, and pressed metals

GRW AC, B and 719 series angular contact spindle ball bearings

High-precision angular contact spindle bearings from GRW are engineered for high-speed machine tool electrospindles, dental handpieces, and optical scanners. Optimized contact geometry and tight tolerances provide outstanding radial rigidity and axial positioning stability under dynamic loads.

Contact angles of 15° and 25° supporting combined dynamic radial and thrust loads
Hybrid ceramic rolling elements made from silicon nitride Si3N4 for top velocities
Outer-ring guided cages machined from reinforced phenolic and engineering polymers
Precision matched pairing sets with calibrated preload values for spindle stacks

GRW matched duplex bearing pairs in DB, DF and DT arrangements

GRW matched duplex bearing sets feature ground ring faces aligned for back-to-back (DB), face-to-face (DF), or tandem (DT) mounting. These precision assemblies deliver zero-play positioning across linear drive feed screws and rotary CNC tables under alternating axial thrust forces.

Factory calibrated internal clearance and preload options rated L, M, and S levels
Tandem DT setup distributing high unidirectional axial forces across both units
Back-to-back DB and DF layouts stabilizing shafts against dual axial movements
Laser marked matching rings ensuring correct orientation during spindle installation

GRW miniature high-precision ball bearings for medical and instrument fields

GRW miniature bearings with bore sizes beginning at one millimeter are engineered for dental turbines, surgical power tools, aerospace gyros, and optical encoders. Specialized non-corrosive alloys endure steam autoclave cycles and chemical sanitization without dimensional loss.

Bore diameters starting from 1.0 mm with form deviation limits under 0.0005 mm
Resilient against aggressive cleaning solvents, alcohol wash, and steam sterilization
Dry-film lubricant coatings and vacuum-stable synthetic greases for cleanrooms
Flanged outer ring configurations type F for secure mounting inside thin walls

GRW integrated precision bearing units and cartridge assemblies

Pre-assembled bearing units from GRW combine high-precision bearings, lightweight housing shells, ground spacers, and shafts into ready-to-mount modules. Adhesive bonding under controlled axial preload eliminates runout and shortens assembly cycles across precision instrumentation.

Pre-set calibrated preload requiring zero alignment adjustments during installation
Structural alloy housing elements treated with protective anodized surface layers
Multi-stage labyrinth seal barriers preventing dust and moisture ingress in service
Integrated mounting flanges for direct positioning on machine reference planes

GRW bearing inspection instruments and dental turbine test benches

Specialized testing equipment from GRW encompasses automated dental turbine test benches, torque meters, and acoustic bearing vibration analyzers. These systems deliver automated rotational evaluation up to 600,000 rpm alongside comprehensive tribological tracking in quality labs.

Automated speed measurement across micro turbines from 20,000 up to 600,000 rpm
Pneumatic brake unit applying calibrated load from 0.1 to 6 N with 0.1 N precision
Standard digital interface exporting test curves, torque data, and report files
Reference load cell sensors and quick-clamping fixtures for repeatable testing

Gebrüder Reinfurt engineering origins and Rimpar production headquarters

German high-precision bearing manufacturer Gebrüder Reinfurt (GRW) was founded in 1942 in Wuerzburg, northern Bavaria. In 1958, the enterprise established a dedicated manufacturing plant in Rimpar, which became the corporate headquarters in 2009.

The facility houses modern cleanroom departments configured for contamination-free bearing assembly.

In 2015, GRW joined the global industrial group Kaman Corporation. This integration combined traditional German mechanical expertise with rigorous aerospace reliability standards, ensuring thorough quality inspection protocols across all rolling elements and ground raceways prior to deployment.

Structural characteristics and precision ratings of 600 and 6000 radial lines

Single-row deep groove radial bearings of GRW 600 and 6000 lines conform to DIN/ISO and ANSI/AFBMA standards across ABEC 5, ABEC 7, and ABEC 9 precision classes. Superfinished raceway micro-geometry minimizes rotational friction torque and thermal generation during continuous high-velocity rotation.

For challenging operating environments, GRW supplies SS stainless alloy and vacuum-degassed 100Cr6 chrome steel variants with sub-zero structural stabilization.

Cages formed from phenolic laminate, PEEK polymer, and stainless strip maintain geometric integrity across temperatures from -270 °C up to +450 °C.

Kinematics and dynamic stiffness of AC and B series angular contact units

GRW angular contact spindle bearings of AC, B, and 719 families are built for machine tool electrospindles and high-speed drives.

The inner geometry is engineered for combined radial and axial force distribution at 15-degree and 25-degree contact angles, preventing dynamic spindle deflection under cutting forces.

Hybrid configurations feature ceramic rolling elements made from premium silicon nitride Si3N4. Ceramic balls exhibit low mass density and minimal thermal expansion coefficients, suppressing centrifugal loading along outer ring tracks and preventing seizure during high-velocity milling.

Duplex pairing schemes DB, DF, DT and calibrated internal preload control

Precision duplex bearing sets from GRW are matched with micron-level face offset accuracy. The back-to-back arrangement (DB) provides superior moment rigidity against tilting forces, whereas the face-to-face setup (DF) accommodates minor angular misalignments without inducing internal ball binding.

For heavy unidirectional axial thrusts, the tandem layout (DT) distributes dynamic loads evenly across multiple rows. Factory selective fitting produces calibrated preload ratings in light L, medium M, and heavy S tiers, eliminating lost motion across linear motion axes.

Miniature dental turbine bearings and steam autoclave resilience

The specialized miniature line from GRW covers micro bearings with bore diameters starting from 1 mm, designed for dental turbines, micro-motors, and gyroscopic instruments. These units operate reliably at extreme velocities reaching hundreds of thousands of revolutions per minute.

Dental versions incorporate corrosion-proof alloys immune to sterilizing fluids and repetitive steam autoclave cycles at +135 °C. Outer rings with integrated F-type flanges facilitate straightforward installation inside slim handpiece shells without danger of axial shifting under vibration.

Automated inspection technology and dynamic Dental Test Bench systems

To verify operating lifespan and dynamic runout across high-speed handpieces, GRW developed the automated Dental Test Bench. The instrument operates through an autonomous test sequence, eliminating operator subjectivity while delivering repeatable verification data.

A contactless magnetic sensor monitors rotation speeds spanning 20,000 to 600,000 rpm. The pneumatic braking mechanism applies controlled torque loading between 0.1 and 6 N with ±0.1 N accuracy, while software records digital inspection charts and performance graphs.

GRW and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of GRW and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.