The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X125-10 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X125-10 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw, allowing the stroke end position to be fine-tuned by up to 10 mm without replacing the unit. This field-adjustable feature is ideal for commissioning and format changes, delivering 628 N of push force at 0.5 MPa.
With a 16 mm diameter rod and PT1/4 ports, the cylinder body length is 185 mm. It operates on filtered air from 0.15 to 1.0 MPa, with a standard TPU seal for temperatures of -20 to +70 °C and an adjustable air cushion for smooth deceleration.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X125-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 125 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.
| 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. |
| ×125 | 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.
Adjust the stroke end during initial setup to compensate for assembly tolerances without swapping cylinders.
Quickly adapt the stop position for different product sizes on a packaging or sorting line.
Take up mechanical play that develops over time in clamping or pressing fixtures.
Choose the SCJ40X125-10 when you need to dial in a 125 mm nominal stroke with up to 10 mm of end-position adjustment on the machine. If your application requires a fixed stroke, the standard SC40X125 is a direct alternative. For higher force, step up to the 50 mm bore, which provides 982 N of push at 0.5 MPa. The replacement match is an AirTAC SCJ cylinder with a 40 mm bore, 125 mm stroke, 10 mm adjust range, and PT threads.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 1.0 MPa operating limit is 1130 N.
A screw in the rear cap limits the piston's retraction, shortening the effective stroke by up to 10 mm from the nominal 125 mm. It sets the end position, not the speed or force.
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