Airtac SCJ40 Standard Cylinder SCJ40X275-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X275-50 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. Ø40mm bore, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke275 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X275-50
The SCJ40X275-50 is a double-acting, single-rod tie-rod cylinder with a 50 mm field-adjustable stroke range built into the rear cap. With a 40 mm bore delivering 628 N of push force at 0.5 MPa, it is well-suited for applications where the stroke end position needs regular fine-tuning during commissioning or product changeovers. The 16 mm diameter piston rod and PT1/4 ports provide a robust connection for pneumatic circuits.
This model's 275 mm nominal stroke is the maximum extension before the rear adjusting screw is engaged. Turning the screw lets you shorten the stroke end by up to 50 mm without dismounting the cylinder or adding external hard stops. The body length A for this SCJ configuration is 185 mm, making it a compact solution for integrating adjustable end-position control into machine designs.
Airtac SCJ40 Standard Cylinder SCJ40X275-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X275-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 275 mm |
| Stroke adjustment | Up to 50 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 SCJ40X275-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×275 | 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 SCJ40 Standard Cylinder SCJ40X275-50 Is Used
Commissioning & Setup
Fine-tune the actuator end-stop on a new packaging machine during initial run-off, dialing in the exact stroke for a sealing jaw without fabricating custom shims or mechanical stops.
Product Format Changeover
Quickly adjust the push-off stroke on a conveyor diverter to handle boxes of different widths, reducing changeover time between production batches with a simple screw adjustment.
Wear Compensation
Periodically tweak the stroke end to compensate for gradual wear on a contact pad or tooling tip, maintaining consistent part engagement without replacing the entire cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X275-50 the Right Cylinder?
Choose the SCJ40X275-50 when your application requires a mid-range force output with the flexibility to change the stroke end position on the machine. If you need more force, stepping up to the 50 mm bore provides 982 N of push force at the same 0.5 MPa pressure. For applications where the stroke length is fixed and will never need adjustment, the standard SC40X275 fixed-stroke cylinder is a simpler, more cost-effective alternative. To replace this unit, match the 40 mm bore, 275 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting style with another AirTAC SCJ cylinder.
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 SCJ40 Standard Cylinder SCJ40X275-50 FAQ
A rear-cap adjusting screw sets the stroke end position. The cylinder's nominal stroke is 275 mm, and the screw lets you shorten that stroke by up to 50 mm in the field. It adjusts the end position only and does not change the cylinder's force, speed, or bore size.
At 0.5 MPa operating pressure, the SCJ40X275-50 generates 628 N of push force and 528 N of pull force. The pull force is lower because the single piston rod reduces the effective piston area on the return stroke.
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