Airtac SCJ40 Standard Cylinder SCJ40X80-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke80 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X80-20
The SCJ40X80-20 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke reduction. This allows you to dial in the exact stroke end position without swapping the cylinder, making it ideal for commissioning trials or format changeovers. With an 80 mm nominal stroke and a 40 mm bore, the unit delivers 628 N of push force at 0.5 MPa, using a 16 mm diameter piston rod and PT1/4 ports.
Built on the robust SC tie-rod platform, the SCJ40X80-20 includes an adjustable air cushion for smooth deceleration and operates reliably between -20 and +70 °C with its standard TPU seals. The body length A(SCJ) is 185 mm, providing a compact envelope for the force class. This basic configuration offers a cost-effective solution for applications where you need to fine-tune the retract or extend end-stop position during setup.
Airtac SCJ40 Standard Cylinder SCJ40X80-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCJ40 Standard Cylinder SCJ40X80-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ40 Standard Cylinder SCJ40X80-20 Is Used
Commissioning & Setup
The 20 mm adjusting screw lets technicians fine-tune the end-of-stroke position during machine commissioning, eliminating the need to shim or reposition the cylinder mounting to achieve a perfect pick-and-place location.
Format Changeover
On packaging or assembly lines that handle multiple product sizes, the adjustable stroke allows operators to quickly reset a pusher or stop gate's travel from 80 mm down to 60 mm without changing the cylinder, minimizing downtime between batches.
Wear Take-Up
In clamping or pressing fixtures, the stroke can be gradually extended over the cylinder's service life to compensate for wear on tooling pads or seals, maintaining consistent clamping force without replacing the actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X80-20 the Right Cylinder?
Choose the SCJ40 when you need the 40 mm bore's force profile—628 N push at 0.5 MPa—and the ability to fine-tune the stroke end by up to 20 mm. If your application requires more force, stepping up to a 50 mm bore (SCJ50) provides 982 N of push force at the same pressure. For applications where the stroke is fixed and never needs adjustment, the standard SC40 fixed-stroke cylinder is a simpler, more economical alternative. This SCJ40X80-20 is a direct replacement for another AirTAC SCJ adjustable-stroke cylinder with identical 40 mm bore, 80 mm nominal stroke, 20 mm adjust range, PT ports, and basic mounting.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ40 Standard Cylinder SCJ40X80-20 FAQ
The theoretical push force at 0.5 MPa is 628 N, and the pull force is 528 N, due to the 16 mm rod reducing the piston area on the return stroke. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N. Always apply a safety factor for real-world dynamic loads.
A rear-cap screw mechanically limits the piston's stroke end by up to 20 mm, allowing you to shorten the 80 mm nominal stroke to any length between 60 and 80 mm. It is a direct replacement for an SCJ40 of the same configuration, but it cannot be used to replace a standard SC fixed-stroke cylinder unless the mounting and porting are identical and you require the adjustability feature.
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