Airtac SCJ40 Standard Cylinder SCJ40X250-30S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-30S 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke250 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X250-30S
The SCJ40X250-30S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you a 30 mm fine-tuning range on its 250 mm nominal stroke. This model includes a built-in magnet, so you can clamp CMSG/DMSG/EMSG reed or solid-state sensors directly onto the tie-rod barrel for precise end-of-stroke or mid-stroke position feedback without extra brackets.
At 0.5 MPa, it delivers 628 N of push force and 528 N on the pull stroke, making it a solid mid-range actuator for applications that need both power and adjustability. The 16 mm piston rod, PT1/4 ports, and 21 mm air cushion work together to provide smooth, controlled motion. The body length A for this SCJ is 185 mm, and it handles speeds from 30 to 800 mm/s.
Airtac SCJ40 Standard Cylinder SCJ40X250-30S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 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 SCJ40X250-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SCJ40X250-30S Is Used
Commissioning & Setup
During machine commissioning, the 30 mm rear screw lets technicians dial in the exact stroke end position without swapping cylinders or machining hard stops, speeding up the final alignment of actuators on assembly fixtures.
Product Format Changeover
On packaging lines, quickly adjust the push stroke for a new box size. The SCJ40X250-30S allows operators to shorten the stroke end by up to 30 mm in seconds, minimizing downtime between product runs.
Wear Compensation
In clamping or pressing operations, the adjustable stroke end can be advanced over time to compensate for wear on tooling or workpieces, maintaining consistent contact pressure without reprogramming the machine control system.
Is the Airtac SCJ40 Standard Cylinder SCJ40X250-30S the Right Cylinder?
Step up to the 50 mm bore SCJ if your load requires more than the 628 N push force this 40 mm model provides at 0.5 MPa (the SCJ50 offers 982 N). If your application does not need the 30 mm stroke-end adjustment, a fixed-stroke SC40X250-S with a magnet is a simpler, cost-effective alternative. For a direct replacement, match the 40 mm bore, 250 mm nominal stroke, 30 mm adjust range, PT1/4 ports, basic mounting, and the -S magnet option.
At a 250 mm stroke, the rod is fully supported within the cylinder, but if you are pushing a heavy or off-centre load, consider an external guide rail or a guided cylinder to protect the rod and bearing from side-load damage over time.
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 SCJ40X250-30S FAQ
The push force is 628 N at 0.5 MPa and 1130 N at the maximum operating pressure of 0.9 MPa. The pull force is lower because of the single rod design, providing 528 N at 0.5 MPa. These values are identical to the fixed-stroke SC40 cylinder.
A rear-cap adjusting screw sets the physical end point of the piston's stroke, allowing you to shorten it by up to 30 mm from the 250 mm maximum. It acts as a mechanical stop and does not change the cylinder's bore, operating pressure, or output force. It is not a speed or force controller.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCJ Adjustable-Stroke Cylinders
Request a Quote for Airtac SCJ40 Standard Cylinder SCJ40X250-30S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.