The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X75-30TC 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ40X75-30TC is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you a 30 mm fine-tuning range on the 75 mm nominal stroke. Its 40 mm bore delivers 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa), while the 16 mm diameter piston rod and 21 mm air cushion provide smooth, controlled deceleration. The centre trunnion mount (F-SC40TC with TCM1 bracket) allows the cylinder to pivot during operation, ideal for swinging or articulating machine elements.
This adjustable-stroke design lets commissioning engineers dial in the exact stop position without swapping cylinders or adding external hard stops, saving time during setup and format changes. With a PT1/4 port, standard TPU seals for -20 to +70 °C operation, and a body length of 185 mm, it directly replaces any SCJ40X75-30TC cylinder requiring the same trunnion mounting configuration.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X75-30TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 75 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. |
| ×75 | 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.
Fine-tune the end-of-stroke position during machine commissioning by up to 30 mm without removing the cylinder, speeding up the trial-and-error process for sensor alignment and part placement.
Quickly adjust the stroke end for different product sizes on a packaging or assembly line. The trunnion mount allows the cylinder to pivot, following a curved guide or swinging gate.
Compensate for mechanical wear in tooling or gripper fingers over time. The screw adjustment lets operators restore precise end-position accuracy without replacing worn parts immediately.
Choose the SCJ40 bore when your application needs around 628 N of push force at standard plant pressure. If you need more force, step up to the SCJ50 with 982 N push at 0.5 MPa; for a lighter, more compact solution, the SCJ32 delivers 402 N. The 30 mm adjustment range is ideal for processes that need moderate stroke-end variability, such as accommodating different part thicknesses. If your stroke is fixed and never changes, a standard SC fixed-stroke cylinder may be a more economical choice. For strokes of 300 mm or longer, always evaluate side-loading on the 16 mm rod; an external guide rail or a guided cylinder is recommended to prevent rod bending and ensure long seal life.
Adjustable-stroke checklist
A rear-cap adjusting screw limits the piston's out-stroke end position. You can shorten the nominal 75 mm stroke by up to 30 mm in the field. It adjusts the stroke end only—it does not change the cylinder's force, speed, or bore size.
A direct replacement must be an AirTAC SCJ40X75-30TC with a centre trunnion (TC) mount and PT1/4 ports. The F-SC40TC mounting kit includes the trunnion bracket. Ensure the replacement matches the 30 mm adjust range, as other ranges like -10 or -50 will alter the stroke-end adjustability.
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