Airtac SCJ50 Standard Cylinder SCJ50X70-30S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X70-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 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-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X70-30S
The SCJ50X70-30S is a 50 mm bore, single-rod, double-acting pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw provides a 30 mm adjustment range, letting you fine-tune the effective stroke from 40 mm up to the nominal 70 mm without removing the cylinder. This model includes a built-in magnet, allowing direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for end-of-stroke detection.
With a 20 mm diameter piston rod and PT1/4 ports, it delivers 982 N of push force and 825 N of pull force at 0.5 MPa. The cylinder features an adjustable air cushion (21 mm long) for smooth deceleration and operates within a 30-800 mm/s speed range. The body length A(SCJ) is 194 mm, making it a compact solution for applications needing on-machine stroke tweaking during commissioning or format changes.
Airtac SCJ50 Standard Cylinder SCJ50X70-30S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X70-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 70 mm |
| Stroke adjustment | Up to 30 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 SCJ50X70-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×70 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ50X70-30S Is Used
Commissioning & Setup
Fine-tune the actuator's end position during initial machine setup. The 30 mm adjustment screw allows engineers to quickly compensate for assembly tolerances in tooling and fixtures without needing shims or custom stops.
Wear Compensation
In clamping or pressing operations, the adjustable stroke can be periodically shortened to take up slack from pad wear or material compression, maintaining consistent clamping force and cycle time without replacing the cylinder.
Product Changeover
Quickly adapt a stopper or diverter station for different product sizes. The 30 mm adjust range allows operators to change the stopping position for a new box or pallet format in seconds using just a wrench.
Is the Airtac SCJ50 Standard Cylinder SCJ50X70-30S the Right Cylinder?
Choose this SCJ50X70-30S when you need to dial in a precise stroke end position on the fly. If 982 N of push force at 0.5 MPa is insufficient, stepping up to a 63 mm bore (SCJ63) provides 1559 N of push force. If the force is more than adequate, a 40 mm bore (SCJ40) delivers 628 N. The SCJ is the right pick over a fixed-stroke SC when the exact stroke length is not yet finalized or must be periodically recalibrated. For a direct replacement, match the 50 mm bore, 70 mm nominal stroke, 30 mm adjust range, PT port thread, and the -S magnet option. This model uses a basic mount; if a pivoting motion is required, consider the TC centre trunnion variant.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X70-30S FAQ
At the standard operating pressure of 0.5 MPa, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. The push force is higher because the single rod reduces the effective piston area on the retract side. The maximum push force at 0.9 MPa is 1767 N.
A screw on the rear cap acts as an internal stroke limiter for the extend direction. Turning the screw changes the piston's end position by up to 30 mm. This screw is not a locking device; the cylinder will drift or drop if air pressure is lost. For load holding without pressure, an external rod lock or pilot-operated check valve is required.
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