The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X70-30 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, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X70-30 is a double-acting, single-rod pneumatic cylinder that puts fine stroke control directly into the rear cap. A built-in adjusting screw lets you shorten the stroke end by up to 30 mm without removing the cylinder from the machine, making it ideal for commissioning trials, format changeovers, or taking up mechanical wear over time. The 63 mm bore generates 1559 N of push force at 0.5 MPa, while the 20 mm piston rod and 28 mm air cushion deliver smooth, reliable deceleration.
This genuine AirTAC SCJ unit uses a PT1/4 port and an M16x1.5 rod thread, with a body length A of 197 mm. The adjustable-stroke design does not alter the cylinder's force output or speed—it simply sets a new mechanical end position within the 30 mm range. For position sensing, an optional magnet (add -S to the code) allows CMSG/DMSG sensors to clamp directly onto the tie-rod barrel.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X70-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 70 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. |
| ×70 | 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.
Fine-tune the end stop during machine bring-up without swapping cylinders. The 30 mm adjustment screw lets technicians dial in the exact stroke position on the fly.
Quickly adapt a packaging pusher or diverter to a new box size by adjusting the stroke end. The 63 mm bore provides ample force for medium-weight product handling.
Take up mechanical play in linkages or tooling over time. A simple turn of the rear screw restores the precise end position without downtime for a cylinder swap.
Step up to an 80 mm bore SCJ if your application demands more than the 1559 N push force this 63 mm unit provides at 0.5 MPa; the SCJ80 delivers 2513 N. For applications that do not require field-adjustable stroke, the fixed-stroke SC63 series offers a simpler, more cost-effective alternative. If the load needs guided motion to prevent rod rotation, pair this cylinder with an external guide or consider a guided cylinder series.
To replace an existing SCJ63X70-30, match the 63 mm bore, 70 mm nominal stroke, and 30 mm adjustment range exactly. Ensure the port thread is PT, the mounting style is basic (or match your specific FA/LB/TC bracket), and confirm whether a magnet is needed. The mounting accessories use the F-SC63 prefix (e.g., F-SC63FA for a front flange).
Adjustable-stroke checklist
At 0.5 MPa, the cylinder delivers 1559 N pushing and 1402 N pulling. The maximum operating force at 0.9 MPa is 2805 N push. The rear adjusting screw changes only the stroke end position, not the force output.
Yes, if you need field-adjustable stroke. The SCJ63X70-30 matches the SC63 mounting dimensions and porting, but the body is slightly longer to house the adjusting screw. Ensure your machine has clearance for the rear adjustment mechanism.
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