IDENTIFICATION
How to Identify Your Helac Actuator: Model Tag, Serial Number & Code Breakdown
A Helac rotary actuator is identified by the model code on its silver plastic tag, usually fixed to the housing. If the tag is missing or worn, read the stamped numbers on the body and measure the outside diameter, shaft, and mounting pattern. The model code states the series, size, mounting type, rotation angle, and valve option in a fixed order.
Last reviewed: September 2026
Three Ways to Identify Your Actuator
01
Read the tag
Locate the silver plastic tag on the housing. The full model code is printed here and is the fastest identification method.
02
Check stamped numbers
If the tag is missing, look for stamped numbers on the body. These usually show the series and size, sometimes with a manufacturing date.
03
Measure the unit
Measure outside diameter, shaft diameter, mounting bolt pattern, and rotation angle. Send the numbers and we narrow down the series.
Helac Model Code Breakdown
The code is read from left to right. Each segment tells us something about the replacement we need to match.
| Position | Meaning | Example values |
|---|---|---|
| 1–3 | Series | L10, L20, L30, L40, HTX, HP |
| 4 | Size / gear set | 5, 7, 10 (varies by series) |
| 5 | Mounting type | M = foot mount; flange variants follow series convention |
| 6 | Shaft type | RF, S1, etc. (depends on series) |
| 7 | Rotation angle | 180, 360 (degrees) |
| 8 | Valve / port option | O = valve on one side; H = hose port variant |
Example code
L10-5-5-M-RF-360-S1-O-H
Serial Numbers and Manufacturing Date
Stamped serial numbers help confirm the production batch and sometimes the manufacturing date. They are useful when the model tag is partially legible or when verifying whether a unit belongs to an OEM-specific revision.
Always include a photo of any stamped numbers along with the tag photo so we can cross check against production records.
What to Photograph for an Inquiry
1. Tag close-up
Clear, in-focus photo of the model code and serial number.
2. Mounting face
Shows bolt pattern and pilot diameter.
3. Shaft end
Shows shaft diameter, keyway, or spline detail.
4. Machine nameplate
Helps confirm OEM part number and application.
FREE IDENTIFICATION
Send for Free Identification
Send the model code, OEM part number, and photos. We identify the exact series and confirm the replacement match before you order.
Or email directly: hm@hmhydraulics.com
Questions
Frequently asked questions
What if the Helac tag is missing?+
If the plastic tag is missing or unreadable, look for stamped numbers on the housing and measure the outside diameter, shaft diameter, mounting pattern, and rotation angle. Send us clear photos and we identify the series.
Where is the model tag located?+
The silver plastic tag is usually riveted or glued to the side of the actuator housing, near the valve ports.
Can I identify the actuator from the OEM part number alone?+
Often yes, because OEM part numbers map back to Helac model codes. We can cross-reference the OEM number and confirm the replacement match.
What photos should I send for identification?+
Send a close-up of the tag, a clear view of the mounting face, the shaft end, and the machine nameplate. These four photos cover the data we need most.
Do the stamped numbers include the full model code?+
Stamped numbers may show only the series and size. The full configuration—rotation angle, valve, and mounting—is usually only on the plastic tag.
Helac® and all OEM names are trademarks of their respective owners. HM Hydraulics is an independent manufacturer and is not affiliated with, sponsored by, or endorsed by Helac, Parker, or any listed OEM. Part numbers and model codes are used solely for identification and compatibility purposes.