Airtac SCJ40 Standard Cylinder SCJ40X55-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X55-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø40mm bore, 55mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke55 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X55-30
The SCJ40X55-30 is a double-acting, single-rod pneumatic cylinder that puts 628 N of push force at 0.5 MPa into a compact, field-adjustable package. Its rear-cap adjusting screw provides up to 30 mm of stroke-end reduction, letting you dial in the exact stop position for a 55 mm nominal stroke without swapping the cylinder or adding external hard stops.
Built on a proven tie-rod design, this 40 mm bore unit uses a 16 mm diameter piston rod and PT1/4 ports. The adjustable air cushion decelerates the piston smoothly, and the body length A(SCJ) is 185 mm. It is a practical choice when a machine's end-stop needs fine-tuning during commissioning or format changes.
Airtac SCJ40 Standard Cylinder SCJ40X55-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X55-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 55 mm |
| Stroke adjustment | Up to 30 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 SCJ40X55-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×55 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ40X55-30 Is Used
Commissioning Fine-Tuning
Adjust the stroke end in 30 mm increments during machine setup to perfectly align the actuator with mating parts, eliminating the need for shims or custom stops.
Format Changeover
Quickly adapt the stopping position for different product sizes on a packaging line. The screw adjustment allows operators to change the stroke end without tools or disassembly.
Wear Compensation
Take up mechanical play or seal wear over time by advancing the stroke end. This keeps the mechanism operating precisely without replacing the entire cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X55-30 the Right Cylinder?
Choose the SCJ40X55-30 when you need to fine-tune the stroke end position on a 40 mm bore platform. If 628 N of push force at 0.5 MPa is insufficient, stepping up to the 50 mm bore provides 982 N. For applications that do not require stroke adjustment, the fixed-stroke SC40 cylinder is a simpler, cost-effective alternative. A direct replacement must match the 40 mm bore, 55 mm nominal stroke, 30 mm adjust range, PT port thread, and basic mounting style.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ40X55-30 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N.
A screw in the rear cap limits how far the piston can retract, effectively shortening the stroke end by up to 30 mm. It does not change the cylinder's bore or force output, only the stop position.
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