The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-30STC 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.
The SCJ40X50-30STC is a 40 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap screw provides up to 30 mm of stroke shortening, letting you fine-tune the end position from 20 mm to the full 50 mm nominal stroke without swapping the cylinder. This model delivers 628 N of push force at 0.5 MPa and is built with a 16 mm diameter piston rod.
This specific unit is factory-equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion pivot (-TC) for swinging applications. The TC mount includes the TCM1 bracket (order code F-SC40TC) and allows the cylinder body to pivot, accommodating angular movement in the driven load. The default TPU seal and PT port threads suit standard industrial air service from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-30STC |
|---|---|
| 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.
| 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. |
| ×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.
The 30 mm adjustment range allows technicians to precisely set the stroke end during initial machine setup without cutting rods or adding external hard stops, cutting commissioning time.
On a packaging line, quickly re-set the pusher stroke for a new box size. The SCJ40's 628 N push force handles medium-weight product diverting, and the centre trunnion mount allows the cylinder to swing into position.
In clamping or pressing fixtures, the adjustable stroke end can be advanced over time to compensate for pad wear or material thickness changes, maintaining consistent clamping force without replacing the actuator.
Choose the SCJ40 when you need up to 628 N of push force at standard shop air pressure and the ability to dial in the stroke end on the machine. If your force requirement is lower, the 32 mm bore SCJ32 provides 402 N of push; for a step up in force, the SCJ50 delivers 982 N at the same 0.5 MPa. This adjustable-stroke design is ideal when the exact stroke length is determined during commissioning or requires periodic tweaking. If your application uses a fixed, unchanging stroke, the standard SC40 fixed-stroke cylinder is a simpler, cost-effective alternative.
For replacement, match with another AirTAC SCJ40X50-30S with a TC centre trunnion mount, ensuring the 30 mm adjust range, PT port threads, and magnet sensor compatibility are identical. The centre trunnion is the correct choice for pivoting loads; for a rigid surface mount, consider the LB foot mount instead.
Adjustable-stroke checklist
As a single-rod cylinder, push and pull forces are different. At 0.5 MPa, the theoretical push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N.
This SCJ40X50-30STC is a direct replacement for any AirTAC SCJ40 with a 50 mm nominal stroke, a 30 mm adjustment range, a centre trunnion (TC) mount, a magnet sensor option, and PT threads. Verify that the adjust range and mounting style match your existing unit exactly, as the rear screw and pivot point must be identical.
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