The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X85-30S 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, 85mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X85-30S is a double-acting, single-rod pneumatic cylinder that puts field-adjustable stroke control directly on the machine. Its rear-cap screw lets you shorten the stroke end by up to 30 mm without removing the cylinder, making it a practical choice for commissioning trials and format changeovers where the exact travel needs to be dialled in on-site. The built-in magnet (-S) allows CMSG/DMSG/EMSG sensors to clamp directly onto the 40 mm bore tie-rod barrel for reliable end-of-stroke sensing.
With a 16 mm diameter piston rod and PT1/4 ports, this unit delivers 628 N of push force and 528 N of pull force at 0.5 MPa. At the maximum operating pressure of 0.9 MPa, push thrust reaches 1130 N. The adjustable air cushion decelerates the load smoothly over the final 21 mm of travel, protecting end caps and reducing noise. The body length A(SCJ) is 185 mm, and the cylinder is rated for standard TPU seals from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X85-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 85 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. |
| ×85 | 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.
The 30 mm rear adjustment screw lets technicians fine-tune the stroke end position during initial machine bring-up without swapping cylinders or fabricating custom hard stops.
On packaging or sorting lines that handle different product sizes, operators can quickly adjust the cylinder stroke to match a new box height or pallet width, minimizing downtime between batches.
In clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear in tooling or gripper pads over time, maintaining consistent contact without reprogramming the machine.
Choose the SCJ40 bore when your application needs roughly 600 N of push force at standard shop air. If you require more force, stepping up to the SCJ50 delivers 982 N push at 0.5 MPa, while stepping down to the SCJ32 provides 402 N. This adjustable-stroke model is ideal when the exact stroke length is still being determined during setup; if your stroke is fixed and never changes, the standard SC40 fixed-stroke cylinder is a simpler, more cost-effective alternative. For a direct replacement, match the 40 mm bore, 85 mm nominal stroke, 30 mm adjust range, PT port thread, basic mounting, and the -S magnet option.
At an 85 mm stroke, the standard rod support is adequate for purely axial loads, but any significant side force will require an external guide rail or a switch to a guided cylinder to prevent rod bending and premature seal wear.
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, the theoretical push force is 128 kgf. The pull force is always lower because the rod reduces the effective piston area on the return stroke.
Yes, provided you match the 40 mm bore, PT1/4 ports, and basic mounting. The SCJ40X85-30S has a slightly longer body (185 mm) to house the adjusting screw, so ensure you have the extra space. It also includes a magnet for sensor mounting, which the standard SC may not have.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.