Airtac SCJ40 Standard Cylinder SCJ40X25-10S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X25-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø40mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke25 mm
- Stroke adjust-10 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X25-10S
The SCJ40X25-10S delivers 628 N of push force at 0.5 MPa, giving you a compact 40 mm bore actuator with a 10 mm field-adjustable stroke range. Its 16 mm diameter piston rod and PT1/4 port ensure a robust connection, while the rear adjusting screw lets you fine-tune the stroke end position during commissioning or changeovers without swapping the cylinder.
This model includes a built-in magnet, allowing you to clamp CMSG, DMSG, or EMSG sensors directly onto the tie-rod barrel for reliable, non-contact position sensing. The 21 mm air cushion at each end decelerates the piston smoothly, and the 185 mm body length keeps the footprint compact for tight machine spaces.
Airtac SCJ40 Standard Cylinder SCJ40X25-10S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X25-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 10 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 SCJ40X25-10S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -10 | 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 SCJ40X25-10S Is Used
Commissioning Fine-Tuning
Adjust the stroke end by up to 10 mm on a new assembly line to perfectly align a pusher or stop without re-machining hard stops.
Wear Compensation
Take up mechanical play in a clamping fixture over time by advancing the screw, maintaining consistent grip force as tooling wears.
Format Changeover
Quickly shift the end position for a different product size on a packaging machine, reducing downtime between batches.
Is the Airtac SCJ40 Standard Cylinder SCJ40X25-10S the Right Cylinder?
Choose the SCJ40X25-10S when you need to dial in a precise stroke end on the fly. If 628 N of push force is marginal, stepping up to the 50 mm bore provides 982 N at the same pressure. For applications where the stroke must never be altered after setup, the fixed-stroke SC series is a simpler alternative. This unit directly replaces another AirTAC SCJ40 with a 25 mm nominal stroke and a 10 mm adjust range, matching PT ports and the S magnet option.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-10)
- ✓ 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 SCJ40X25-10S FAQ
At 0.5 MPa, it generates 628 N pushing and 528 N pulling. The push force is higher because it is a single-rod cylinder, with the full bore area acting in one direction.
You can if you need the 10 mm field adjustability and the magnet. It matches the bore, nominal stroke, and PT ports, but the body is slightly longer to house the adjusting screw.
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Related AirTAC SCJ Adjustable-Stroke Cylinders
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