Airtac SCJ40 Standard Cylinder SCJ40X450-30S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-30S 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke450 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X450-30S
The SCJ40X450-30S is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a 450 mm nominal stroke, featuring a rear adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. This allows precise fine-tuning of the piston stop position without removing the cylinder, making it ideal for commissioning and format changeovers. The built-in magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
At 0.5 MPa, this cylinder delivers 628 N of push force and 528 N of pull force, with a maximum push thrust of 1130 N at 0.9 MPa. The 16 mm diameter piston rod and PT1/4 port ensure robust air flow, while the 21 mm air cushion at each end decelerates the piston for smooth operation. With a body length A of 185 mm, this genuine AirTAC unit is a durable solution for applications requiring a long, adjustable working stroke.
Airtac SCJ40 Standard Cylinder SCJ40X450-30S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 450 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 SCJ40X450-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 SCJ40X450-30S Is Used
Commissioning & Setup
The 30 mm adjustable stroke allows engineers to dial in the exact stop position during initial machine commissioning, eliminating the need to fabricate custom shims or external hard stops.
Product Pusher with Sensor Feedback
With the built-in magnet, CMSG sensors easily mount to the barrel to confirm full extension and retraction, making this cylinder perfect for a long-stroke product diverter or pusher on a packaging line.
Wear Compensation
In high-cycle applications, tooling or contact surfaces can wear down over time. The rear adjuster can be tweaked to extend the stroke slightly, compensating for wear and maintaining consistent part engagement without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X450-30S the Right Cylinder?
Choose the SCJ40X450-30S when your application requires a 450 mm stroke that can be shortened by up to 30 mm for fine-tuning an end position. If 628 N of push force at 0.5 MPa is insufficient, consider stepping up to the 50 mm bore SCJ50 series, which provides 982 N of push force. For a fixed, non-adjustable stroke, the standard SC series is a more economical alternative. This model is a direct replacement for any AirTAC SCJ cylinder with a 40 mm bore, 450 mm nominal stroke, 30 mm adjust range, PT ports, and a magnetic piston.
Given the 450 mm stroke length, be mindful of potential rod bending under high side loads. For applications where the load is not perfectly guided, consider using an external guide rail or switching to a guided cylinder to protect the rod and seals from premature wear.
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 SCJ40X450-30S FAQ
At the standard operating pressure of 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. Pull force is lower due to the area of the 16 mm piston rod.
Yes, the SCJ40X450-30S can replace a fixed-stroke SC40X450 if you need the added benefit of a field-adjustable stroke end. The mounting dimensions and port locations are compatible, though the SCJ body is slightly longer to house the adjusting screw. Ensure your machine can accommodate the extra body length.
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