The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X80-75 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke reduction. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a versatile actuator for applications where the end position needs fine-tuning during commissioning or changeover.
This model features a nominal 80 mm maximum stroke, PT1/4 ports, and an M12x1.25 rod thread. The adjustable-stroke design adds minimal length compared to a fixed-stroke SC cylinder, with a body length of 185 mm, allowing it to fit into tight spaces where an external stop would be impractical.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 75 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. |
| ×80 | Nominal (maximum) stroke length in mm. |
| -75 | 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 in 75 mm increments during machine setup to perfectly align a stop position without re-machining brackets or swapping cylinders.
Quickly adapt a pusher or diverter stroke for different product sizes on a packaging line by turning the rear screw, minimizing downtime between batches.
Take up mechanical play or tooling wear over time by incrementally extending the effective stroke, maintaining consistent contact pressure without replacing the actuator.
Choose the SCJ40 when you need to dial in the stroke end position on the machine without swapping cylinders. If the 628 N push force at 0.5 MPa is insufficient, stepping up to a 50 mm bore provides 982 N. For applications requiring a fixed, repeatable stroke with no field adjustment, the standard SC series is a more economical choice. A direct replacement must match the 40 mm bore, 80 mm nominal stroke, 75 mm adjustment range, PT port thread, and basic mounting. For strokes of 300 mm or more, evaluate side-loading and consider adding an external guide rail to prevent rod bending.
Adjustable-stroke checklist
A screw in the rear cap limits how far the piston can retract. By turning the screw, you can shorten the stroke end by up to 75 mm from the nominal 80 mm maximum. It adjusts the mechanical stop position only and does not change the cylinder's force or speed.
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the rod area on the return side.
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