Representative HEIDENHAIN rotary encoder image, not the exact ID

HEIDENHAIN EQN 437 Absolute Multiturn Rotary Encoder

HEIDENHAIN EQN 437 Absolute Multiturn Rotary Encoder

Key specifications

Very high axial tolerance of up to ±1 mm or ±1.5 mm
Blind hollow shaft, hollow through shaft, or tapered shaft
Very high positioning accuracy of down to ±20"
33 554 432 positions/rev.
Multiturn functionality for up to 4096 revolutions
Max. operating temperature: 100 °C
Absolute rotary encoder with integral bearing and mounted stator coupling
Multiturn (4096 revolutions)
Interface: EnDat 2.2/22
25 bits positions/rev
Available with functional safety; Fanuc version EQN 437F

Download historical specifications (2009 catalog, PDF)

Current specifications

May 2026 catalog. Match the full HEIDENHAIN ID, interface and shaft version before selecting a replacement.

EQN 437, valid for ID 1178025-xx: absolute multiturn, EnDat 2.2 / EnDat22, 33,554,432 positions per revolution and 4096 revolutions; accuracy ±20 arcseconds.
DC 3.6 V to 14 V; maximum power consumption 0.7 W at 3.6 V and 0.8 W at 14 V; typical current at 5 V 95 mA. M12 flange socket, radial, or 1 m cable with M12 coupling.
Blind hollow shaft or hollow through shaft, Ø8 or Ø12 mm; mounted stator coupling. Functional-safety versions require their exact product information and ID check; do not substitute the EQN 437F Fanuc version.

Download current EQN 437 specifications (May 2026, PDF)

Historical configuration specifications

From the HEIDENHAIN Rotary Encoders catalog, October 2009. Values are catalog values; confirm your unit's configuration from its ID label.

EQN 437: absolute multiturn, EnDat 2.2, 33 554 432 positions x 4 096 revolutions, 3.6 to 14 V, up to 140 mA.
Blind hollow shaft or hollow through shaft D = 8 or 12 mm, mounted stator coupling, IP 67 at housing and IP 64 at shaft inlet, approx. 0.3 kg, –40 °C to 100 °C.

Documents

Pricing and lead times on request. Use Request a Quote and include measuring length, interface, and accuracy grade.