Rotork IQ Size 35
Rotork IQ35F16B4 Intelligent Electric Actuator
An IQ size 35 multi-turn actuator configuration with ISO 5210 F16 non-thrust base and B4 coupling geometry.
Product Summary
Exact mechanical configuration at a glance
Rotork IQ35F16B4 identifies an IQ size 35 actuator mechanical configuration using an ISO 5210 F16 base and B4 non-thrust coupling.
Rotork’s official size 35 drawing specifies a 44 mm H8 maximum bore for the B4 coupling, a 216 mm base diameter and four M20 × 2.5 mounting holes on a 165 mm pitch circle diameter.
Technical Highlights
Configuration details that define the model
ISO 5210 F16
Metric F16 mounting geometry for the specified configuration.
B4 non-thrust
B3/B4 coupling arrangement shown in the official size 35 drawing.
44 mm H8
Maximum B4 coupling bore stated on the official drawing.
216 mm
Overall circular base diameter for the F16 arrangement.
165 mm PCD
Metric F16 mounting-hole pitch circle diameter.
4 × M20 × 2.5
Four equally spaced metric threaded holes.
Performance & Compatibility
Mechanical interface and configuration compatibility
The F16 base is the ISO 5210 metric arrangement shown for IQ size 35 non-thrust couplings. Do not substitute the FA16 arrangement, which uses MSS SP-102 dimensions and 3/4-inch UNC mounting holes.
The B4 coupling is documented with a 44 mm H8 maximum bore and 69 mm shaft clearance. Electrical supply, motor speed and output torque are configuration-dependent and must be matched to the actuator nameplate or official order documentation.
| Actuator size | IQ 35 |
|---|---|
| Base | F16, ISO 5210 |
| Coupling form | B4, non-thrust |
| B4 maximum bore | 44 mm H8 |
| Shaft clearance | 69 mm |
| Base diameter | 216 mm |
| Mounting PCD | 165 mm |
| Mounting holes | 4 × M20 × 2.5, equally spaced |
Installation / Connection Guide
Official IQ35 dimensions and F16/B4 interface
Both images are cropped from Rotork’s official IQ3 size 35 dimensional data sheet. The first shows the actuator envelope; the second shows the B3/B4 coupling and F16 base geometry.
Selection & Ordering Notes
Checks before ordering or replacing the unit
-
Keep the full model string
Use IQ35F16B4 to preserve the size, base standard and coupling selection.
-
Use metric F16 mounting
The specified F16 interface uses four M20 × 2.5 holes on a 165 mm PCD.
-
Confirm the machined B4 bore
The official drawing gives 44 mm H8 as the maximum; the delivered bore must match the driven shaft.
-
Match electrical performance separately
Supply, motor speed and torque are not established by the F16/B4 mechanical suffix alone.
FAQ
IQ35F16B4 technical questions
What does F16 identify in IQ35F16B4?
It identifies the ISO 5210 F16 metric base arrangement.
What type of coupling is B4?
B4 is the non-thrust coupling option shown with the B3/B4 arrangement in the official drawing.
What is the maximum B4 bore?
The official IQ size 35 drawing specifies a 44 mm H8 maximum bore.
What mounting-hole pattern is used?
The F16 base uses four M20 × 2.5 holes equally spaced on a 165 mm PCD.
Does IQ35F16B4 alone define motor speed and torque?
No. Those values depend on the actuator’s electrical and motor configuration and must be checked against official order data or the nameplate.
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