The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-20STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X75-20STC delivers 628 N of push force at 0.5 MPa, making it a capable mid-range actuator for tasks that demand a precise, field-tunable stroke end. Its 16 mm diameter piston rod and PT1/4 port provide a robust connection, while the rear adjusting screw offers a 20 mm range to fine-tune the cylinder's extended position without swapping hardware.
This model is factory-equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion (TC) mount, supplied with the TCM1 bracket (F-SC40TC), allowing the cylinder to pivot and self-align in swinging load applications. The TPU seals and PT threads ensure reliable, leak-free operation in standard industrial air systems.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 20 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. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Quickly adjust the stroke end stop by up to 20 mm when switching between product sizes on a packaging or labeling machine, eliminating the need for mechanical hard stops.
Field engineers can dial in the exact actuator extension during initial machine setup, compensating for minor build tolerances in welded frames or custom tooling.
On sorting gates or diverter arms, the adjusting screw can be used to take up mechanical play or seal wear over time, maintaining consistent part contact without replacing the cylinder.
Choose this 40 mm bore when your application needs more force than a 32 mm unit (402 N push) but does not require the 982 N output of a 50 mm cylinder. The 20 mm adjustable stroke is ideal for commissioning and fine-tuning end positions, but if your design has a fixed, unchanging stroke, a standard SC fixed-stroke cylinder is a simpler and more cost-effective alternative. For direct replacement, match the bore (40 mm), nominal stroke (75 mm), 20 mm adjust range, PT port thread, TC centre trunnion mount, and magnet option exactly.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this double-acting cylinder generates 628 N of push force and 528 N of pull force. The pull force is lower due to the area of the 16 mm piston rod. The maximum push force at 0.9 MPa is 1130 N.
You can, if the bore, nominal stroke, and mounting style match. The SCJ40X75-20STC has the same body length A(SCJ) of 185 mm but adds a rear adjusting screw for a 20 mm stroke-end reduction. Ensure you have clearance for the screw and that the TC trunnion mount (F-SC40TC) and magnet sensor option are compatible with your machine.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.