The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X85-30 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. Ø63mm bore, 85mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X85-30 delivers 1559 N of push force at 0.5 MPa, making it a capable mid-bore actuator for tasks that need on-the-fly stroke tuning. Its rear adjusting screw lets you shorten the stroke end by up to 30 mm without removing the cylinder, so commissioning and format changes happen in minutes instead of hours.
This 63 mm bore unit uses a 20 mm piston rod, PT1/4 pneumatic ports, and a 28 mm air cushion to decelerate the load quietly. The adjustable-stroke body length A(SCJ) is 197 mm, and the cylinder is rated for a maximum operating pressure of 1.0 MPa, where it produces 2805 N of push force.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X85-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 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 | M16×1.5 |
| 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, 28 mm |
| Max stroke | Up to 1500 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | 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.
Dial in the exact push stroke during machine build without cutting rod extensions or shimming hard stops. The 30 mm rear screw lets technicians fine-tune the end position while the line is dry-cycling.
Quickly adjust the stroke when a packaging line switches between box sizes. One operator can reset the stop in seconds, keeping changeover downtime to a minimum on carton-erecting stations.
Take up mechanical play in clamping or pressing fixtures over time. As tooling wears, the 30 mm adjustment range lets you restore the original clamp position without replacing the cylinder.
Step up to an 80 mm bore SCJ if your load exceeds the 1559 N push force this 63 mm unit provides at 0.5 MPa (the SCJ80 delivers 2513 N at the same pressure). If your application never requires stroke adjustment, a fixed-stroke SC63 cylinder is a simpler, lower-cost alternative. For a direct replacement, match the 63 mm bore, 85 mm nominal stroke, 30 mm adjust range, PT port thread, and basic mounting style.
At this 85 mm stroke, rod deflection is minimal under axial loads, but if you are pushing an off-centre mass, add an external guide rail or switch to a guided cylinder to protect the rod bearing from side wear.
Adjustable-stroke checklist
At 0.5 MPa, push force is 1559 N and pull force is 1402 N (the pull force is lower because the 20 mm rod reduces the piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N.
Yes, if the mounting footprint and port location match. The SCJ63 body is slightly longer to house the rear adjusting screw, so check the 197 mm A(SCJ) dimension against your available space. You must also match the port thread (PT) and ensure the 30 mm adjustment range covers your stroke-variation needs.
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