The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X70-40 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, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X70-40 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 40 mm of field-adjustable stroke reduction. This lets you dial in the exact stroke end position during commissioning or changeovers without removing the cylinder. At 0.5 MPa, it delivers 628 N of push force and 528 N of pull force, making it suitable for medium-duty positioning and clamping tasks.
With a 16 mm diameter piston rod and PT1/4 ports, this 40 mm bore tie-rod cylinder includes a 21 mm air cushion to decelerate the piston smoothly. The body length A is 185 mm, slightly longer than the fixed-stroke SC variant to accommodate the adjusting mechanism. Operating pressure spans 0.15–1.0 MPa, and the standard speed range is 30–800 mm/s.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X70-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 70 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. |
| ×70 | 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.
Fine-tune the stroke end position during initial machine setup to achieve precise part contact or clearance without fabricating custom stops.
Adjust the stroke incrementally to compensate for gripper pad wear or tooling compression over time, maintaining consistent clamping force.
Quickly reset the cylinder stroke for different product sizes on a packaging or assembly line by turning the rear adjusting screw.
Choose the SCJ40X70-40 when you need to fine-tune the stroke end position on the machine, such as setting a precise clamp gap or compensating for tooling wear. If 628 N of push force at 0.5 MPa is insufficient, stepping up to the 50 mm bore SCJ50 series provides 982 N at the same pressure. For applications where the stroke is fixed and never needs adjustment, the standard SC40 fixed-stroke cylinder offers a simpler, more compact alternative.
A direct replacement must match the 40 mm bore, 70 mm nominal stroke, 40 mm adjust range, PT1/4 ports, and basic mounting. This model carries no magnet, so position sensing requires external switches. For swinging loads, consider the TC centre trunnion mounting variant.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 1280 N. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
Yes, if you need the adjustable stroke feature. The SCJ shares the same bore, rod, and port dimensions as the SC40, but the body is slightly longer. Ensure the 40 mm adjust range and the additional length fit your mounting space. The stroke end screw only shortens the stroke; it does not extend it beyond the 70 mm nominal rating.
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