FSI has been designing and manufacturing high quality optical incremental rotary shaft encoders for industrial, commercial, military and medical applications for over 40 years. Encoders convert motion into digital information for display or control based on motion variables such as position, speed, length, RPM, etc. FSI encoders are widely recognized for their legendary quality and durability. Our main product line includes the RSE series, HDE (Heavy Duty) series, ESE series, MBR (low cost) series, Defender and the Tuff-Coder.

FSI encoders are available in single channel or quadrature, line counts up to 2500, a range of mounting options including Series 25, single or double shaft, varying shaft diameters, index pulse & differential, and up to a NEMA 4X stainless steel enclosures for both industrial and OEM applications.

In addition to our "Fork Standards" encoders, FSI has partnered with Kwangwoo to provide a complete line of competitively-priced, high-quality, industrial-grade optical encoders, both solid and hollow shaft. We manufacture and brand label encoders for many familiar encoder suppliers.

FSI is committed to innovation, quality and customer satisfaction

FSI (Fork Standards) : Solid Shaft Encoders

Kwangwoo: Solid Shaft Encoders   Hollow Shaft Encoders   Absolute Encoders   Manual Pulse Encoders

Encoder Brochure (500K)                 Encoder Ordering Guide (600K)                 Kwangwoo Encoder Brochure (341K)

Solid Shaft Encoder
FSI Optical Incremental Rotary Shaft Encoders
RSE: Our main cube encoder family, the (gold standard) of the industry. Millions of standard versions available, plus additional customization is available.		HDE: Ruggedized and fully sealed cube encoder family, including double shaft seals. For severe wet (NEMA 4) and dusty environments. Millions of standard versions available, plus additional customization is available.
ESE: Standard industrial grade encoder, lower cost than the RSE. Common versions and options available.		MBR: Our lowest cost cube encoder. Limited versions available. Available in single channel or quadrature designs, with line counts of 60, 100, 120, 360 or 600 PPR.
Defender: NEMA 4X stainless steel construction. All applicable options from the RSE and HDE families are also available in the Defender series.		Tuff-Coder: The toughest encoder ever made. 5/8” diameter shaft on 10” spaced heavy-duty bearings with grease fittings. The main enclosure body is machined from a solid block of metal. NEMA 4 construction.

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Kwangwoo Solid Shaft Encoder
Kwangwoo Optical Incremental Rotary Shaft Encoders
RIB-40-12	RIB-60-16	RIB-60-18	RIB-60-20
RIB-60-22	RIB-60-56	RIB-60-58	RIB-66-60
RIB-80-30	RIB-A1-36

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Hollow Shaft Encoders
Kwangwoo Optical Incremental Hollow Shaft Rotary Encoders
RIA-30-50	RIA-38-52	RIA-40-08	RIA-40-10
RIA-60-54	RIA-80-24	RIA-80-26	RIA-80-28
RIA-90-32	RIA-90-34

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Absolute Encoders
Kwangwoo Optical Absolute Rotary Shaft Encoders
RAA-60-40	RAA-60-42	RAA-60-44	RAA-70-46

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Manual Encoder
Kwangwoo Optical Rotary Pulse Generator
RIM-80-48

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