Airtac SCJ40 Standard Cylinder SCJ40X275-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X275-20 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke275 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X275-20
The SCJ40X275-20 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke. A rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm, giving you 275 mm of nominal travel that can be dialed back precisely during commissioning or format changes. The 40 mm bore delivers 628 N of push force at 0.5 MPa, making it a capable mid-range actuator.
This tie-rod cylinder uses a 16 mm diameter piston rod with an M12x1.25 rod thread and PT1/4 ports. Air cushioning is 21 mm long at each end, and the SCJ body length A is 185 mm. It runs on 40 µm filtered air from 0.15 to 1.0 MPa, with a speed range of 30-800 mm/s and an operating temperature of -20 to +70 °C.
Airtac SCJ40 Standard Cylinder SCJ40X275-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X275-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 275 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 SCJ40X275-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×275 | 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 SCJ40X275-20 Is Used
Commissioning & Setup
Dial in the exact stroke end position during machine bring-up without changing cylinders or machining custom stops. The 20 mm adjustment range lets you compensate for assembly tolerances.
Product Changeover
Quickly adjust the cylinder's end stop to handle different product sizes on a packaging or sorting line. The screw mechanism makes format changes tool-free and repeatable.
Wear Compensation
As gripper pads or tooling tips wear down over time, use the rear adjusting screw to take up the slack and restore precise positioning without disassembling the actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X275-20 the Right Cylinder?
Choose the SCJ40X275-20 when you need to fine-tune the stroke end position on a machine without adding external hard stops. If you require more force, stepping up to the 50 mm bore provides 982 N of push at 0.5 MPa. For applications where the stroke is fixed and never needs adjustment, the standard SC series is a simpler, cost-effective alternative. A direct replacement must match the 40 mm bore, 275 mm nominal stroke, 20 mm adjustment range, PT1/4 ports, and basic mounting. At 275 mm of stroke, the rod is well-supported within the cylinder; if you are pushing an offset load, consider an external guide rail to prevent rod bending.
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 SCJ40X275-20 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (the difference is due to the 16 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1280 N. Always size your cylinder based on the required force at your specific working pressure.
Yes, provided the bore (40 mm), nominal stroke (275 mm), port thread (PT1/4), and mounting style match. The SCJ body is slightly longer to house the adjusting screw, so check the 185 mm body length A against your available space. The SCJ is not an ISO 15552 cylinder, so it will not directly interchange with ISO-profile actuators.
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