This bearing for H bracket Mechanical Buffalo (MB) std.
Dimension : 70mm x 18mm x hole 30mm
Weight         : 40 gm
 
The Bearing 6306 is a deep groove ball bearing widely used in automotive, industrial, and mechanical applications. Below is a concise overview based on available information:

Specifications:
Type: Single-row deep groove ball bearing.
Part Number: 6306 (suffixes like 2RS, ZZ, or 2Z indicate seals/shields, e.g., 6306-2RS for rubber seals, 6306-ZZ for metal shields).
Material: Typically chrome steel (Gcr15); stainless steel or ceramic available for specialized uses.
Load Ratings (approximate, varies by manufacturer):
Dynamic Load: ~26,700 N
Static Load: ~15,000 N
Speed Limits (approximate):
Grease Lubrication: ~9,000–11,000 RPM
Oil Lubrication: ~12,000–14,000 RPM
Cage: Usually steel; nylon or brass for high-speed or specific applications.
Sealing Options:
Open (no seals/shields)
2RS (double rubber seals for dust/water resistance)
ZZ/2Z (double metal shields for lower friction)
Clearance: Standard (C0), with C3 (greater clearance) for high-speed or high-temperature applications.
 
Applications:
Automotive: Used in alternators, starters, water pumps, or wheel hubs.
Industrial: Common in electric motors, pumps, fans, and conveyors.
Machinery: Found in agricultural equipment, power tools, and HVAC systems.
Other: Bicycles, motorcycles, or appliances (sealed versions like 6306-2RS are popular).
 
Key Features:
Supports radial and moderate axial loads in both directions.
Low friction, suitable for high-speed operations.
Durable, especially with sealed/shielded versions for low maintenance.
Standardized size ensures wide availability and affordability.