FGH4K-1024G-90G-NG/20P Heavy-Duty Encoder Replacement Solution

The FGH4K-1024G-90G-NG/20P heavy-duty incremental encoder was originally developed for precision feedback applications in harsh industrial environments. As this model has become increasingly difficult to source from its original manufacturer, we now provide a customized 1:1 replacement solution to help users maintain system performance and reliability. Our engineering team designs encoders that fully replicate the original specifications — including shaft size, mechanical mounting, pulse resolution, and electrical interface — ensuring a perfect fit and seamless installation. To further support our industrial partners, we have streamlined our production workflow to achieve short delivery times, allowing rapid replacements and minimizing costly downtime in production lines.

The original FGH4K-1024G-90G-NG/20P encoder earned a solid reputation in metallurgical and steel-processing industries, where it was commonly installed in rolling mills, drive control systems, and position feedback mechanisms for heavy-duty equipment. The model’s robust housing, high shock resistance, and consistent output accuracy under vibration and temperature fluctuations made it one of the preferred encoders for continuous operation environments. Our custom-manufactured heavy-duty version inherits all these strengths while ensuring modern compatibility and stable supply for long-term maintenance requirements.

Our replacement solution has been successfully deployed across multiple regions, including the Middle East, Russia, Southeast Asia, Indonesia, and South America. These installations demonstrate our capability to provide reliable encoder alternatives that meet the demanding conditions of global metallurgical industries.

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