About GMN Bearings

GMN is under the leadership of its fourth generation family owned business. GMN Paul Müller Industrie GmbH & Co. KG in Nuremberg manufactures high-precision ball bearings, machine spindles, freewheel clutches, non-contact seals and electric drives. 

1908   Georg Müller opens his mechanical workshop;

1923   Start of ball bearing production (angular ball bearing E5);

1928   Start of “high-precision ball bearing” production;

1932   Start of production for the patented “tempo grinding spindles”;

1937   Motor-driven grinding spindle with 5 kW motor for a grinding depth of up to 1,000 mm;

1952   Belt-driven grinding spindle with 105,000 rpm

• Electric spindle for grinding holes with a grinding depth of 2,000 mm

1953   First water-cooled HF spindle with up to 30,000 rpm;

1963   Patent registration freewheel clutch;

1966   Start of production for sprag type freewheel clutches with 4 mm sprag height;

1967  Start of production for sprag type freewheel clutches with 16 mm sprag height;

1976  Start of production for non-contact labyrinth metal seals;

1978  First HF spindle for automatic tool change;

1979  Start of production for non-contact labyrinth plastic seals;

1981  High-speed milling with magnetic bearing spindle (25 kW, 30,000 rpm);

1982  HF spindle with 24,000 rpm for aluminum machining;

1983  High-speed HFS (milling) and HSS (grinding) spindles with oil injection lubrication;

1985  HF spindle with speed factor up to 1.8 mill. mm/min

• Development of the oil-air lubrication

1987  Start of production for sprag type freewheel clutches with 8 mm sprag height;

1988  Ball bearing cage made of PEEK for temperatures up to 250 °C and grease lubrication;

1989  Spindle series for internal grinding with oil-air lubrication

• High-speed HF spindle for machining centers
• Development and testing of active magnetic-bearing high-speed spindles

1991  Spindle series for internal grinding with a speed coefficient up to 2.5 mill. mm/miHF 

spindle   for machining centers with HSK, internal coolant supply, rotary encoder, short

acceleration and braking times;

1997 Complete bearing systems for X-ray tubes;

2002 HF spindle with 80 kW at 16,500 to 30,000 rpm and a removal rate of 8 l/min;

2003 Spindle series for internal grinding with speed coefficient of up to 2.8 mill. mm/min

• High-performance grinding spindle with 125 kW at 20,000 rpm
• Small milling spindles for automatic tool change and with encoder-free synchronous motor. 
• HF spindle for rotary milling centers with Hirth shaft locking
• Sealed spindle bearing design for maximum speeds and increased service life

2004 HF spindle with HSK 25 and 75,000 rpm, internal coolant supply and encoder;

2005 HF spindle with 120 kW at 13,500 to 30,000 rpm and removal rate of > 10 l/min;

2006 Internal grinding spindle with 250,000 rpm and speed coefficient 4.5 mill. mm/min;

2008  Spindle bearing with a hole diameter of 75 to 120 mm;

2010  Spindle bearing with optimized inner ring geometry for maximum speeds with a hole

diameter of 75 to 120 mm.

GMN Products

GMN Bearings has an extensive range of precision bearings. The GMN product portfolio includes:

• Angular Contact Ball Bearings
  Engineered to accommodate both radial and axial loads, GMN’s angular contact ball bearings excel in high-speed applications and precision machinery.

• Spindle Bearings
  GMN spindle bearings are known for their precision and high rotational speeds, GMN spindle bearings play a critical role in various machining applications, like CNC machines and milling centers.

• Deep Groove Ball Bearings
  With low-friction attributes and exceptional quality, GMN’s deep groove ball bearings find themselves in a wide array of applications, from household appliances to industrial machinery.

• Radial Ball Bearings
  GMN’s radial ball bearings are specially designed to support radial loads, ensuring smooth operation and minimizing friction for maximized machine efficiency.

• Hybrid Bearings
  Featuring ceramic balls, GMN’s hybrid bearings elevate performance levels, reduce friction, and extend service life.

• Special Custom Bearings
  GMN takes immense pride in its ability to tailor bearings to meet specific customer requirements.