Airtac SCJ50 Standard Cylinder SCJ50X70-40TC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X70-40TC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 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-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X70-40TC
This SCJ50X70-40TC is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides up to 40 mm of field-adjustable stroke reduction. At 0.5 MPa, it delivers 982 N of push force and 825 N on the pull stroke, making it a capable mid-range actuator for tasks requiring fine-tuned end-position control.
The 50 mm bore uses a 20 mm diameter piston rod and PT1/4 ports, with a 21 mm air cushion at each end for smooth deceleration. The TC suffix designates a centre trunnion mount, supplied with the TCM1 bracket, which allows the cylinder to pivot and is ideal for swinging or articulating machine elements. Its body length is 194 mm plus the nominal stroke.
Airtac SCJ50 Standard Cylinder SCJ50X70-40TC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X70-40TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 70 mm |
| Stroke adjustment | Up to 40 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 SCJ50X70-40TC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×70 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50X70-40TC Is Used
Format Changeovers
Quickly adjust the end-stop for different product sizes on packaging or labelling machines without mechanical rework, reducing downtime between batches.
Part Diverter Gates
The centre trunnion mount allows the cylinder to pivot, making it suitable for actuating diverter arms on conveyor systems where the stroke end can be tuned for a precise gate angle.
Clamping with Wear Compensation
In automated welding or assembly fixtures, the 40 mm adjustment range can be used to compensate for clamp pad wear over time, maintaining consistent clamping force without replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X70-40TC the Right Cylinder?
Choose the SCJ50 when you need the 982 N push force at 0.5 MPa; if your load is lighter, stepping down to a 40 mm bore (628 N push) can reduce air consumption and physical size. For higher force requirements, the 63 mm bore provides 1559 N push. The 40 mm adjustment range on this model is perfect for commissioning trials or format changeovers where the end-stop needs to be dialled in precisely without swapping the cylinder.
This model is a direct replacement for another AirTAC SCJ50X70-40TC with a centre trunnion mount and PT ports. If your application does not require a pivoting motion, a basic or foot-mounted SCJ50X70-40 would be a simpler alternative. For applications where the stroke never needs field adjustment, the fixed-stroke SC series offers a more compact and cost-effective solution.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50X70-40TC FAQ
A screw in the rear cap acts as an adjustable end-stop for the piston. Turning the screw changes the retracted stroke end position by up to 40 mm, allowing you to fine-tune the 70 mm nominal stroke down to a minimum of 30 mm. It does not alter the cylinder's force or speed.
At the standard 0.5 MPa operating pressure, the push force is 982 N and the pull force is 825 N. The pull force is lower due to the area of the 20 mm piston rod. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1767 N.
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