The most typical type of bearing. Deep groove ball bearings can sustain radial load and axial load in both directions. Because of less friction torque, noise and vibration, these are suitable for high speed applications.

For the contact angle, these are capable of a radial load and a large axial load in one direction at the same time. With using several of them together, these can keep appropriate preload and be used as support bearings of ball screw and rotating main shaft.

Polylube Bearings enclose “Solid grease”, which is a lubricant mainly containing lubricating grease and resin. There are two types: the spot-pack type in which solid grease is injected into several points of the retainer, and the full-pack type in which all space around the rolling elements is filled with solid grease.

There are several types of cylindrical roller bearings besides the standard type. Type E of identical size to standard ones has a high load capacity. Type HT has a large axial load capacity. Type HL provides extended wear life under the conditions where the development of a lubricating film inside the bearing is difficult. There are some types based on the number of row, such as double row type, four row type and so on. For extremely heavy load applications, Type SL of the non-separable full roller is available.

Tapered Roller Bearings are designed so raceway surface of the inner and outer rings and the apex of the tapered rollers intersect at one point on the bearing centerline. For this feature, the rollers are guided along the raceway surface by being pushed against the inner rib by the synthetic force received from the inner and outer raceway surfaces.

Self-Aligning Roller bearings have the inner ring with double-row track groove, the outer ring with spherical surface and the rolling element of barrel-shaped. The center of the outer ring track surface matches the center of the bearing. Because the bearing is able to align itself, it can be used even when having a finishing unevenness or an inclination of inner and outer ring caused by shaft deflection.

These bearings are designed primarily to support axial loads at contact angles between 30° and 90°. There are thrust ball bearings using balls and thrust roller bearings using rollers.

The rolling element of Needle Bearing is cylindrical and its cross-section height is slight. Compared with other types, the Needle Bearings have a significant load-bearing capacity and rigidity for their space. The inertial forces acting on them is limited. Needle Bearings have various types, such as Radial Bearings, Thrust Bearings, Cam Follower, Roller Follower and One-Way Clutch.

Besides Pillow type and Flanged type, products with special specifications are available.

• Stainless Steel series (Stainless Steel Bearing + Stainless Steel Cast Iron Bearing Box)
• Plastic series (Stainless Steel Bearing + Glass Fiber-Reinforced Resin Bearing Box)
• Ductile series (Spheroidal Graphite Cast Iron Bearing Box)
• Steal series (Rolling Steel Bearing Box for General Structures)

There are sliding bearings made of resin, rolling bearings made of engineering plastic, resin rolling bearings and miniature resin sliding bearings available, used for industrial machine, automobile/electrical accessories, office machine, information device, water supply equipment and so on.

There are Sintered Bearings, Sintered Machine Parts, Fluid Hydrodynamic Bearings, Magnetic Material Product and Resin Molded product available, used for automotive electric equipment, office equipment, information device parts, medical device parts and electrical component for industrial devices.

Minebea's main product line is ball bearings. Minebea is the world's leading manufacturer of miniature and small-sized ball bearings, up to 22mm in external diameter, and has a global market share in excess of 60%. These bearings are mainly used for information and telecommunications equipment, household electrical appliances and motors for electric control systems of automobile. Minebea also manufactures Rod End.

Mizui Seiko is one of the few roller shaft manufacturers in Japan that enables the one-stop production of in-house consistency. Mizui Seiko is capable of composite cutting of materials bigger than φ0.5 (corresponding to coil material and bar material), secondary process cutting, polishing (center-less, infeed, inner diameter, barrel and spherical), grinding (end, groove, surface) and superfinishing (SPF, burnishing, buff).

Cylindrical Roller, Needle Roller, Bar Roller

Custom Made
Material: any of SUJ2 SUS, SKH, SKD etc.
Outer-diameter: inch/fraction diameter (φO.OO)
Outer-diameter range: submicron (+allowance/-allowance)
Hardness: HRC18-65
LOT: 1-1,000,000
End surface: C face, R face, A face, tapered groove

Small-Diameter Shaft

Precision Small-Diameter Shaft
Outer-diameter process size: φ0.5-φ1.54
Outer-diameter accuracy: 0.5㎛
Outer-diameter roughness: Ra0.01
Roundness: 0.1㎛

Super-Small Pin

0.5×L0.6
Fine cutting + precision polishing
Corresponding to austenite type and martensite type
From Small quantity (trial) to tens of thousands(mass production)

Hollow Roller

Small-Inner-Diameter Polishing Roller
［Outer-diameter polishing + end surface polishing + inner-diameter polishing］
Inner-diameter machining size: 1.5mm-5.0mm
Inner-diameter roughness: range 1μm, allowance Ra0.2㎛

Mirror Surface Shaft

Precision Mirror Surface Shaft
Outer-diameter polishing or infeed polishing + super-finishing
Composite polishing
D cutting, H cutting, groove polishing, end face polishing
Outer-diameter machining size: φ2-φ6
Outer-diameter accuracy: 0.5㎛
Outer-diameter roughness: Ra0.01

Fine ASSY

Shaft ASSY
φ0.7×8.5, flange φ1×0.7
Unmating force: 5kg
Pressuring and caulking skill can reduce customers’ processes
More than 100 kg unmating force is available