The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X100-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø40mm bore, 100mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X100-40S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly in your hands via a rear-cap adjusting screw. With a 40 mm adjustment range on a 100 mm nominal stroke, you can dial in the exact end position on the machine without swapping the cylinder or adding external hard stops. Its 16 mm diameter rod and PT1/4 ports deliver a push force of 628 N at 0.5 MPa, rising to 1130 N at 0.9 MPa.
This model includes a built-in magnet (-S suffix), allowing CMSG/DMSG/EMSG reed or solid-state sensors to clamp directly onto the tie-rod barrel for reliable, non-contact position sensing. The standard TPU seal and PT thread keep it ready for filtered-air duty from -20 to +70 °C. The SCJ body length for this bore is 185 mm, slightly longer than a fixed-stroke SC to house the adjusting mechanism.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X100-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 40 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. |
| ×100 | Nominal (maximum) stroke length in mm. |
| -40 | 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 40 mm adjustment range lets technicians fine-tune the actuator's end stop to align with tooling or fixtures perfectly, eliminating the need to machine custom spacers or reposition the entire cylinder.
On packaging or assembly lines that handle multiple product sizes, operators can quickly adjust the stroke end to match a new box height or part width, reducing downtime between batches without any disassembly.
In clamping or pressing operations, the stroke can be incrementally extended over time to compensate for pad or tooling wear, maintaining consistent contact force without reprogramming the machine controller.
Step up to a 50 mm bore SCJ if your application demands more force—the SCJ50 delivers 982 N of push at 0.5 MPa, a significant jump from this 40 mm model's 628 N. If you never need to alter the stroke after installation, the fixed-stroke SC40 series offers a simpler, more compact alternative. For guided or high-side-load tasks, pair this cylinder with an external linear guide or consider a guided cylinder.
When replacing an existing unit, match the bore (40 mm), nominal stroke (100 mm), and the 40 mm adjust range (-40). This model uses PT threads and a basic mount; if your original cylinder had a foot or flange mount, order the corresponding SCJ accessory (e.g., LB foot mount F-SC40LB or FA front flange F-SC40FA). The built-in magnet (-S) must also be matched for sensor compatibility.
Adjustable-stroke checklist
A screw on the rear cap limits how far the piston can retract, effectively shortening the stroke end by up to 40 mm. The 100 mm nominal stroke is the maximum; you can set any shorter stroke within that 40 mm window. It does not alter the cylinder's force or speed.
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (reduced by the 16 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 128 kgf. Always size your load for the lower pull force if the cylinder does work in both directions.
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