HMR4 series · spec 300 · Helical, heavy-duty family
HMR4-300 helical rotary actuator
3,100 Nm driving torque at 210 bar, 180° / 360° rotation, in foot, front-flange or rear-flange mounting. The HMR4-300 is 3rd of 14 sizes in the HMR4 heavy-duty range, built to order for continuous high-load duties on mining, drilling and material-handling equipment, where the same actuator is specified across foot, front-flange and rear-flange builds.
It sits between HMR4-280 at 2,820 Nm and HMR4-470 at 4,750 Nm.
Specifications — HMR4-300
| Rated driving torque | 3,100 Nm |
|---|---|
| Rated pressure | 210 bar |
| Rotation | 180° / 360° |
| Mounting | FT — Foot / FF — Front flange / RF — Rear flange |
| Output shaft | 1F / 2F |
| Valve options | NV / CB / CS |
| Ordering pattern | HMR4-{spec}-{angle}-{mount}-{output}-{valve} |
| Example order code | HMR4-500-180-FT-2F-CS |
HMR4 is rated at 210 bar continuous; at this torque class the tie-rod clearance and bracket stiffness matter as much as the port size. HMR4 is offered in 180° and 360° as standard rotations, with the same rated performance across FT, FF and RF mounting.
What the code means
Every HMR4 unit is specified the same way. If your tag carries a different suffix, the base size is still HMR4-300.
| HMR4 | Series — helical rotary actuator, heavy-duty family, 210 bar rated |
|---|---|
| 300 | Spec size — 3,100 Nm driving torque class |
| 180 / 360 | Rotation — total travel in degrees |
| FT / FF / RF | Mounting — foot / front flange / rear flange |
| 1F / 2F | Output — 1F single flange shaft / 2F double flange shaft |
| NV / CB / CS | Valve — integral valve block or plain ports |
Where HMR4-300 sits in the HMR4 range
The nearest sizes either side of HMR4-300. If your load is borderline, these are the two builds worth checking before you commit to a size. See the full HMR4 range →
Cross reference
Models customers compare with HMR4-300
These are the models that sit in the same torque class and come up in the same enquiries. They are comparable references, not validated substitutions — we confirm the mounting pattern, shaft and port details against your unit before quoting.
| Make | Model | Reference page |
|---|---|---|
| Helac | L30-25 | See the L30-25 page |
| HKS | F10 125 | No page — ask us |
| HKS | F5 125 | No page — ask us |
| Moveco | RR40 | See the RR40 page |
| Sungji | SRC-125 | No page — ask us |
Comparable performance based on rated torque class for engineering comparison. The mounting interface must be confirmed by our engineering team before quotation.
What we check before quoting
On the unit
- Mounting pattern and bolt spacing
- Shaft type, spline or keyway, and length
- Port size, thread form and valve arrangement
On the machine
- Available envelope and tie-rod clearance
- Working pressure and flow at the actuator
- Rotation stops and any mechanical limits
HMR4-300 questions
What can I use in place of an HMR4-300?
We build the HMR4-300 itself to order, and where an HMR4-300 is no longer available we quote the closest HM HMR4 build and confirm the fit against your unit. We do not publish a one-to-one substitution table, because mounting pattern, shaft, port thread and valve arrangement have to match your machine, not just the torque class.
Is HMR4-300 a direct replacement for Helac L30-25?
No — we do not claim a verified drop-in for any other make. Enquiries for this torque class arrive tagged as Helac L30-25, HKS F10 125, HKS F5 125, Moveco RR40, Sungji SRC-125; we treat those as comparable references and compare rated torque, mounting interface, shaft and ports before quoting the HMR4-300 build that suits your machine.
How is the HMR4-300 order code put together?
The pattern is HMR4-{spec}-{angle}-{mount}-{output}-{valve}. A worked example is HMR4-500-180-FT-2F-CS. Rotation, mount, output and valve are chosen per machine, so the code on your drawing is what we build to.
Still identifying the unit? Start with how to identify a rotary actuator or the cross-reference guide.
Send your tag and mounting drawing
We confirm the fit against HMR4-300, quote the matching build and give you a delivery date.
Request a quote for HMR4-300