Airtac SCJ50 Standard Cylinder SCJ50X70-50S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X70-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 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-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X70-50S
The SCJ50X70-50S is a double-acting, single-rod tie-rod cylinder with a 50 mm adjustable stroke range, letting you fine-tune the stroke end position from 20 mm up to the full 70 mm nominal stroke. It delivers 982 N of push force at 0.5 MPa and up to 1767 N at 0.9 MPa, driven by a 20 mm diameter piston rod.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the barrel for precise end-of-stroke detection. The rear adjusting screw shortens the stroke end without changing the cylinder body, making on-machine commissioning and format changeovers fast and tool-free.
Airtac SCJ50 Standard Cylinder SCJ50X70-50S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X70-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 70 mm |
| Stroke adjustment | Up to 50 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 SCJ50X70-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×70 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ50X70-50S Is Used
Commissioning & Setup
Fine-tune the end-stop position during initial machine setup without removing the cylinder or adding external hard stops, saving hours of mechanical adjustment time.
Product Format Changeover
Quickly adjust the stroke to accommodate different product sizes on a packaging line or diverting station by turning the rear screw, eliminating the need for multiple fixed-stroke cylinders.
Wear Compensation
Take up mechanical wear in tooling or gripper linkages over time by slightly extending the effective stroke, maintaining consistent clamping or positioning force without replacing parts.
Is the Airtac SCJ50 Standard Cylinder SCJ50X70-50S the Right Cylinder?
Choose the SCJ50X70-50S when you need to dial in a stroke end position within a 50 mm window without swapping cylinders. If your force requirement is lower, the 40 mm bore SCJ40 delivers 628 N push at 0.5 MPa; for more force, step up to the SCJ63 with 1559 N push. This cylinder replaces another AirTAC SCJ50 with a 70 mm nominal stroke, 50 mm adjust range, PT ports, basic mounting, and a magnet.
For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. If the rod is subjected to side loads, consider an external guide rail or a guided cylinder to prevent rod bending and seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ50X70-50S FAQ
At 0.5 MPa, it provides 982 N of push force and 825 N of pull force. The maximum operating push force at 0.9 MPa is 1767 N. The pull force is lower because the 20 mm rod reduces the effective piston area on the retract side.
Yes, this is a direct replacement for an AirTAC SCJ50 with a 70 mm nominal stroke and a 50 mm adjust range, provided the original also used PT ports, basic mounting, and a magnet. Always match the bore, nominal stroke, adjust range, and port thread for a guaranteed fit.
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