FGH4K-1200G-90G-NG/20P Heavy-Duty Encoder Replacement Solution

The FGH4K-1200G-90G-NG/20P heavy-duty encoder, once widely used in industrial systems requiring precision and durability, has become increasingly difficult to procure as the original production has ceased. To help customers overcome sourcing challenges, we now provide a fully customized 1:1 replacement solution specifically designed to match the original model. Each key specification — including mechanical dimensions, shaft diameter, flange configuration, and output interface — is engineered for perfect interchangeability, allowing for direct installation without equipment modification. Our production process is optimized for flexibility and speed, ensuring short delivery times and helping users minimize downtime while maintaining system reliability.

In metallurgical and heavy manufacturing environments, the FGH4K-1200G-90G-NG/20P encoder has proven its value through its rugged construction, stable signal transmission, and resistance to shock, heat, and contamination. It was frequently used in rolling mills, drive systems, and process automation setups that demand high precision under harsh operating conditions. Our upgraded heavy-duty replacement continues this tradition, offering exceptional reliability and compatibility. The solution has already been successfully implemented in various regions including the Middle East, Russia, Southeast Asia, Indonesia, and South America — regions known for their reliance on durable motion control equipment in challenging industrial applications.

Replacement solution reference image.

Incremental Encoder Specifications (FG(H)4 Series)

Construction type

• Solid shaft B5 (flange) or B35 (flange + foot)
• H = Hollow shaft
• HJ = Hollow shaft (isolated)

Series

[Series information not explicitly listed in the image]

Electrical connection

• R = Terminal strip in a terminal box / 12-pole round connector Bundy
• C = Cable outlet / FCC connector in a terminal box
• KK = Second terminal box (available output signals on request)

Pulses per rotation

• Square pulses: 500, 600, 1000, 1024, 1200, 1300, 2000, 2048, 2400, 2500, ...1 million
• Sinus signals: 500, 600, 1000, 1024, 1200, 1300, 2500
• Other pulse ratios on request

Signal output

• Basic version: 0°, 90°, each with inverted signals
• - = without reference pulse
• NG = Reference pulse with inverted signal

Additional options signal outputs (see p.11)

• 2F = Option 2F; B2 = Option B2
• B = Option B; B3 = Option B3

Overspeed switch (see p.11)

• - = without option S
• S = Option S

Shaft