Airtac SCJ40 Standard Cylinder SCJ40X80-30STC
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-30STC 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke80 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X80-30STC
The SCJ40X80-30STC is a double-acting, single-rod air cylinder that lets you fine-tune the stroke end position by up to 30 mm using a rear-cap adjusting screw, without swapping the unit. With an 80 mm nominal stroke and 40 mm bore, it delivers 628 N of push force at 0.5 MPa, making it a solid choice for light-to-medium pneumatic tasks where precise end-stop setup speeds commissioning.
This model ships with a built-in magnet (-S) for direct mounting of CMSG/DMSG sensors and a centre trunnion pivot (TC) that includes the TCM1 bracket, ideal for applications requiring the cylinder to swing. The 16 mm piston rod, PT1/4 ports, and 21 mm air cushion are standard for the 40 mm bore, and the body length A(SCJ) is 185 mm.
Airtac SCJ40 Standard Cylinder SCJ40X80-30STC Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-30STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 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 SCJ40X80-30STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 SCJ40X80-30STC Is Used
Commissioning & Setup
Quickly fine-tune the end position of a stop gate on a conveyor during initial machine setup, eliminating the need for shims or custom brackets.
Format Changeovers
Adjust the stroke end for a diverter arm on a packaging line when switching between product sizes, reducing downtime between batches.
Wear Compensation
Periodically tweak the stroke end to compensate for seal wear or tooling drift in a clamping fixture, maintaining consistent clamping force over time.
Is the Airtac SCJ40 Standard Cylinder SCJ40X80-30STC the Right Cylinder?
Choose the SCJ40X80-30STC when you need to dial in a stroke end on the machine, such as during format changeovers. If you need more force, stepping up to the 50 mm bore provides 982 N of push at 0.5 MPa; for a lighter, more compact solution, the 32 mm bore offers 402 N. The TC centre trunnion mount handles pivoting loads, but if your application has significant side forces, consider an external guide rail. This unit is a direct replacement for another AirTAC SCJ40X80-30 with a magnet and TC mount using PT ports.
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 SCJ40X80-30STC 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 reaches 1130 N. Remember, as a single-rod cylinder, the pull force is lower due to the rod area.
Yes, this specific model (SCJ40X80-30STC) includes the -S magnet option, so it is ready for AirTAC CMSG, DMSG, or EMSG reed and solid-state sensors to be clamped directly onto the tie-rod barrel.
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