The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X35-20 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, 35mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X35-20 is a 40 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that lets you shorten the stroke end by up to 20 mm without removing the unit. At 0.5 MPa it delivers 628 N push and 528 N pull, suiting light-to-medium clamping, pressing, and positioning tasks where the final stop needs field tweaking.
Inside the tie-rod body, a 16 mm diameter rod runs through a 21 mm air cushion, and the PT1/4 ports keep flow rates up. The body length A(SCJ) is 185 mm, only slightly longer than the fixed-stroke SC equivalent, so it drops into tight spaces while still offering on-machine stroke adjustment.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X35-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 35 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. |
| ×35 | 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.
During machine bring-up, technicians can back out the rear screw to creep up on the exact stop position for a 40 mm bore gripper or ejector, avoiding hard stops that stress tooling.
On a small conveyor diverter, the 20 mm adjustment range compensates for pad wear over months of cycling, restoring the original push-off point without replacing the cylinder or shimming the mount.
A packaging lane using an SCJ40X35-20 can quickly adapt the pusher stroke end for different box widths by turning the rear screw, cutting changeover time versus swapping fixed-stroke cylinders.
Step up to a 50 mm bore (982 N push at 0.5 MPa) if the 628 N push force is marginal for your load, or drop to 32 mm (402 N) when a smaller footprint matters more. The SCJ is the right pick when you need to dial in the stroke end during commissioning or after tooling wear; if the stroke length is fixed and never changes, the standard SC series saves cost. For a drop-in replacement, match the 40 mm bore, 35 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting. If you add a magnet option (-S suffix), CMSG/DMSG sensors can detect the piston position directly on the barrel.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, push force is 628 N and pull force is 528 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
Yes, provided the bore (40 mm), port thread (PT1/4), and mounting style match. The SCJ body is slightly longer (A=185 mm) to house the adjusting screw, and the nominal stroke must match your original. The SCJ adds the ability to shorten the stroke end by up to 20 mm, which the fixed-stroke SC cannot do.
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