The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X150-30 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, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X150-30 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family, built on a 40 mm bore with a 16 mm diameter piston rod. Its defining feature is a rear-cap adjusting screw that provides up to 30 mm of stroke-end reduction, letting you fine-tune the piston's stop position in the field without dismounting the cylinder. At 0.5 MPa air pressure, it delivers 628 N of push force and 528 N on the pull stroke, with a maximum push of 1130 N at the 0.9 MPa operating limit.
This model uses PT1/4 port threads and an M12x1.25 rod-end thread, with an adjustable air cushion of 21 mm at each end for smooth deceleration. The body length A(SCJ) is 185 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism. Standard strokes for the 40 mm bore go up to 1200 mm, so this 150 mm unit is well within the standard range and available as a stock item.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X150-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 150 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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.
During machine commissioning, the 30 mm rear adjuster lets technicians dial in the exact stroke end position without swapping cylinders or machining external hard stops, speeding up line bring-up.
On packaging or assembly lines that run multiple product sizes, the adjustable stroke allows operators to quickly reset the push or eject distance for different box heights or part lengths.
In clamping or pressing fixtures where tooling or pads wear over time, the screw adjuster can be advanced to take up the resulting gap, maintaining consistent contact without reprogramming the machine.
Choose the SCJ40X150-30 when your application needs a 40 mm bore cylinder with a nominal 150 mm stroke and the ability to trim the stroke end by up to 30 mm during setup or changeover. If you need more force, stepping up to the 50 mm bore (SCJ50 series) raises push force to 982 N at 0.5 MPa; for a lighter, more compact solution, the 32 mm bore provides 402 N. If your stroke is fixed and never needs field adjustment, the standard SC40X150 single-rod cylinder is a simpler, cost-effective alternative. For a direct replacement, match the bore (40 mm), nominal stroke (150 mm), adjust range (-30), port thread (PT), and mounting style. This basic configuration accepts the SCJ mounting subset—FA front flange, LB foot, or TC centre trunnion with TCM1 bracket—using F-SC40 type accessory codes. At 150 mm stroke, rod bending under side load is not a primary concern, but always align the load axially for best seal life.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (the difference is due to the 16 mm rod area on the pull side). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1280 N, but AirTAC rates the maximum working push at 0.9 MPa, which is 1130 N.
Yes, if you need the adjustable stroke feature. The SCJ40X150-30 shares the same bore, nominal stroke, port size (PT1/4), and mounting accessories as the SC40 series. The body is slightly longer (185 mm A-length) to house the rear adjusting screw. Ensure your mounting arrangement has clearance for the extra length and the adjuster access.
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