Airtac SCJ50 Standard Cylinder SCJ50X70-10
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X70-10 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø50mm bore, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke70 mm
- Stroke adjust-10 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X70-10
The SCJ50X70-10 is a 50 mm bore double-acting, single-rod cylinder that delivers 982 N of push force at 0.5 MPa, making it a robust actuator for medium-duty automation. Its defining feature is a rear-cap adjusting screw that provides up to 10 mm of stroke-end adjustment, allowing technicians to fine-tune the piston's stop position on the machine without dismounting the cylinder or adding external hard stops.
This model has a nominal 70 mm stroke and uses a 20 mm diameter piston rod with an M16x1.5 male thread for tooling attachment. The tie-rod construction houses an adjustable air cushion (21 mm long) for smooth deceleration, and the standard PT1/4 ports ensure straightforward pneumatic plumbing. The body length A is 194 mm, providing a compact envelope for applications where space and precise end-position control are both critical.
Airtac SCJ50 Standard Cylinder SCJ50X70-10 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X70-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 70 mm |
| Stroke adjustment | Up to 10 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X70-10
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×70 | Nominal (maximum) stroke length in mm. |
| -10 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ50 Standard Cylinder SCJ50X70-10 Is Used
Commissioning & Setup
The 10 mm adjustment screw lets integrators fine-tune the stroke end on a new machine without fabricating shims or repositioning the entire cylinder, speeding up the final alignment of clamps and stops.
Wear Take-Up on Stops
In high-cycle pusher stations, the mechanical end-stop can wear over time. The SCJ's rear screw allows operators to compensate for this wear in seconds, restoring the precise push position without downtime for part replacement.
Format Changeover
When a packaging line switches between product sizes, the 10 mm adjustable range enables a single cylinder to handle slightly different push lengths, eliminating the need for multiple fixed-stroke actuators and reducing changeover time.
Is the Airtac SCJ50 Standard Cylinder SCJ50X70-10 the Right Cylinder?
Choose the SCJ50X70-10 when you need to dial in the stroke end during commissioning or for format changeovers within a 10 mm window. If your force requirement is lower, the 40 mm bore SCJ delivers 628 N push at 0.5 MPa and has a smaller M12x1.25 rod thread; for higher force, the 63 mm bore steps up to 1559 N push and a 28 mm cushion. A fixed-stroke SC cylinder is a simpler, lower-cost alternative if you never need to adjust the end position after installation.
A direct replacement must match the 50 mm bore, 70 mm nominal stroke, 10 mm adjustment range, PT1/4 ports, and basic mounting. If you need piston position sensing, specify the -S magnet option to use CMSG/DMSG sensors. For pivoting applications, the TC centre trunnion mount with the TCM1 bracket is the correct SCJ-compatible accessory.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-10)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X70-10 FAQ
At the standard 0.5 MPa operating pressure, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke.
Yes, if you need the adjustable stroke feature. The SCJ50X70-10 has the same 50 mm bore, 70 mm nominal stroke, and port size as an SC50X70, but its body is slightly longer to house the adjusting screw. Ensure your mounting layout has clearance for the rear adjustment mechanism, and match the port thread (PT) and mounting style.
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