PMB31B-20201-01
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The Pacific Scientific PMB31B-20201-01, part of the PMB Brushless Servomotors Series, features a chrome steel ball bearing design with double shielding. It has a 31mm outer diameter, 20mm inner diameter, and a dynamic load rating of 16.5 kN. Its temperature range spans -30°C to +100°C.
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Product Description:
A ball bearing with exceptional accuracy, the Pacific Scientific PMB31B-20201-01 is utilized in brushless servo-motors and other high-performance rotating devices.
This bearing has an outer diameter of 31 mm, an inner diameter of 20 mm, and is 21 mm wide, making it compact and durable enough to bear radial and axial loads in motion control assemblies. The bearing is made out of high-grade chrome steel and ensures great wear resistance, hardness, and fatigue life-applicable to long-duty-cycle and high-speed applications. It is twin shielded, with excellent protection of the inner parts to dust, contamination, and retention of the lubricant, yet permitting low-resistance turning. It has the characteristics of a dynamic load rating of 16.5 kN and a static load rating of 9.8 kN, which offers solid support to challenging coaching conditions. It runs at a limiting rate of 12,000 rpm with grease and 14,000 rpm with oil lubrication, providing flexibility according to the speed and thermal needs of the application with which it is used.
It has ISO P0 tolerances with consistent dimensional accuracy that is appropriate to general-purpose industrial applications, so it is relatively inexpensive. The bearing has a wide temperature range of –30°C to +100°C, and a range that covers standard temperature and more thermal-intensive environments. Having a rotor inertia of 0.14 kg·m² × 10⁻³ with an encoder, the bearing aspect of the overall motion system is paramount-it influences acceleration and deceleration properties, which is of particular significance in cases of servo applications where rapid dynamic response is required. At only 0.086 kg, the PMB31B-20201-01 is durable with the increased precision needed in motion systems subjected to high levels of control.
Frequently Asked Questions about PMB31B-20201-01:
Q: What are the dimensions of the PMB31B-20201-01 bearing?
A: It has an outer diameter of 31 mm, an inner diameter of 20 mm, and a width of 21 mm—compact enough for servo motors while supporting heavy loads.
Q: What material is used to construct the PMB31B-20201-01?
A: The bearing is made from high-grade chrome steel, which offers excellent wear resistance, hardness, and long fatigue life.
Q: What are the load ratings for the PMB31B-20201-01?
A: It has a dynamic load rating of 16.5 kN and a static load rating of 9.8 kN, providing solid support in demanding motion control applications.
Q: What are the lubrication options and speed limits for the PMB31B-20201-01?
A: The bearing supports up to 12,000 rpm with grease and 14,000 rpm with oil, offering flexibility based on thermal and speed demands.
Q: What type of protection and accuracy does the PMB31B-20201-01 offer?
A: It features twin shields for contamination protection and lubricant retention, and is rated to ISO P0 tolerances for reliable, general-purpose industrial precision.
