HMR6 series · spec 680 · Helical, through-shaft straddle-mount family
HMR6-680 helical rotary actuator
6,780 Nm driving torque at 210 bar, 220° / 180° rotation, in straddle mount. The HMR6-680 is 5th of 5 sizes in the HMR6 through-shaft straddle range, built to order for two-sided drive points on one axis, where the shaft passes right through the housing and both ends drive a load.
It is the largest size in the HMR6 range, above HMR6-500 at 5,090 Nm.
Specifications — HMR6-680
| Rated driving torque | 6,780 Nm |
|---|---|
| Rated pressure | 210 bar |
| Rotation | 220° / 180° |
| Mounting | FT — Foot, straddle only (standard) |
| Output shaft | DS |
| Valve options | NV / CB / CS |
| Ordering pattern | HMR6-{spec}-{angle}-{valve} |
| Example order code | HMR6-280-220-CB |
HMR6 is rated at 210 bar continuous; the straddle mount means both bearing faces are loaded, so bracket alignment is checked before quoting. 220° is the standard rotation on HMR6; 180° is a special angle that has to be confirmed by engineering.
What the code means
Every HMR6 unit is specified the same way. If your tag carries a different suffix, the base size is still HMR6-680.
| HMR6 | Series — helical rotary actuator, through-shaft straddle family, 210 bar rated |
|---|---|
| 680 | Spec size — 6,780 Nm driving torque class |
| 220 / 180 | Rotation — total travel in degrees |
| FT | Mounting — foot, straddle only |
| DS | Output — DS through double spline shaft |
| NV / CB / CS | Valve — integral valve block or plain ports |
Where HMR6-680 sits in the HMR6 range
The nearest sizes either side of HMR6-680. If your load is borderline, these are the two builds worth checking before you commit to a size. See the full HMR6 range →
| Model | Driving torque | Rotation | Page |
|---|---|---|---|
| HMR6-500 | 5,090 Nm | 220° / 180° | HMR6-500 |
| HMR6-680this page | 6,780 Nm | 220° / 180° | — |
Cross reference
Models customers compare with HMR6-680
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 | T20-60 | See the T20-60 page |
| Sungji | SRS-150 | See the SRS-150 page |
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
HMR6-680 questions
What can I use in place of an HMR6-680?
We build the HMR6-680 itself to order, and where an HMR6-680 is no longer available we quote the closest HM HMR6 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 HMR6-680 a direct replacement for Helac T20-60?
No — we do not claim a verified drop-in for any other make. Enquiries for this torque class arrive tagged as Helac T20-60, Sungji SRS-150; we treat those as comparable references and compare rated torque, mounting interface, shaft and ports before quoting the HMR6-680 build that suits your machine.
How is the HMR6-680 order code put together?
The pattern is HMR6-{spec}-{angle}-{valve}. A worked example is HMR6-280-220-CB. 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 HMR6-680, quote the matching build and give you a delivery date.
Request a quote for HMR6-680