Airtac SCJ40 Standard Cylinder SCJ40X50-30SLB
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-30SLB 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke50 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X50-30SLB
The SCJ40X50-30SLB is a 40 mm bore, double-acting, single-rod cylinder with a 50 mm nominal stroke and a 30 mm rear adjusting screw, giving you the ability to fine-tune the stroke end position on the fly without swapping the unit. At 0.5 MPa it delivers 628 N of push force and 528 N on the pull stroke, placing it in a practical force class for positioning and clamping tasks.
This model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and the LB foot mount (F-SC40LB) for stable axial surface mounting. The 16 mm diameter rod and 21 mm air cushion at each end ensure smooth deceleration, while the PT1/4 port keeps plumbing simple. The body length A(SCJ) is 185 mm, slightly longer than a fixed-stroke SC of the same bore to house the adjusting mechanism.
Airtac SCJ40 Standard Cylinder SCJ40X50-30SLB Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-30SLB |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 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 SCJ40X50-30SLB
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SCJ40X50-30SLB Is Used
Commissioning & Setup
The 30 mm adjusting screw lets technicians quickly dial in the exact end-stop position during machine commissioning, eliminating the need for trial-and-error shimming or external hard stops.
Packaging Format Changeover
On a packaging line, the stroke can be easily adjusted to accommodate different box or product sizes. The 628 N push force is well-suited for light to medium case sealing and diverting gates.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be periodically tweaked to compensate for tooling or pad wear, maintaining consistent clamping pressure without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X50-30SLB the Right Cylinder?
Choose the SCJ40 when you need to dial in a precise end position during commissioning or for different product formats. If 628 N of push force is insufficient, stepping up to the 50 mm bore (SCJ50) provides 982 N at the same 0.5 MPa. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a simpler and more cost-effective alternative. This SCJ40X50-30SLB is a direct replacement for another AirTAC SCJ40 with a 50 mm nominal stroke, 30 mm adjust range, PT ports, LB foot mount, and a magnet.
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 SCJ40X50-30SLB FAQ
A screw in the rear cap adjusts the retract stroke end position by up to 30 mm. This allows you to shorten the effective stroke from the nominal 50 mm maximum without changing the cylinder's bore or force output. It is a mechanical stroke-end stop, not a force or speed regulator.
At the standard operating pressure of 0.5 MPa, the SCJ40X50-30SLB generates 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. Because it is a single-rod cylinder, the pull force is always lower due to the area of the 16 mm rod.
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