The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-30S 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. Ø63mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X250-30S is a double-acting, single-rod pneumatic cylinder from AirTAC's adjustable-stroke series, offering a nominal 250mm stroke with a 30mm rear-end adjustment range. This allows fine-tuning of the stroke end position without removing the cylinder, ideal for commissioning and format changes. With a 63mm bore, it delivers 1559 N of push force at 0.5 MPa, driven by a 20mm diameter piston rod.
A built-in magnet (suffix -S) is integrated into the piston, enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. The cylinder features a 28mm air cushion for smooth deceleration and operates with PT1/4 ports. Its body length A(SCJ) is 197mm, and it is rated for a maximum operating pressure of 1.0 MPa.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 250 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. |
| ×250 | 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 push stroke for different box sizes on a packaging line. The 30mm adjustment screw allows operators to quickly adapt the final position of a pusher plate without reprogramming or changing mechanical stops.
Used in a clamping fixture where the clamped part thickness varies or tooling wears over time. The adjustable stroke lets the machine builder set a precise, repeatable clamp point and easily take up mechanical slack during maintenance.
During the setup of a pneumatic sorting gate, the exact stroke end for full-open and full-close positions can be dialed in with the rear screw. The built-in magnet provides sensor confirmation that the gate has reached its adjusted position.
For applications requiring slightly less force, consider stepping down to the SCJ50 series, which provides 982 N of push force at 0.5 MPa. If a higher force is needed, the SCJ80 bore delivers 2513 N. When sensor feedback is not required, the standard SCJ63X250-30 without the -S magnet is a direct alternative. This cylinder is a direct replacement for any AirTAC SCJ63 with a 250mm nominal stroke, 30mm adjust range, PT ports, and a magnetic piston.
Given the 250mm stroke, be mindful of side-loading on the 20mm rod. If the load is not guided externally, an external guide rail or a switch to a guided cylinder should be considered to prevent rod bending and premature seal wear. For fixed-stroke applications, the standard SC series is a more economical choice.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 1559 N, and the pull force is 1402 N due to the 20mm rod reducing the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the push force reaches 2805 N.
Yes, this is a direct dimensional and functional replacement for an AirTAC SCJ63 with a 250mm nominal stroke and 30mm adjustment range. Ensure the port thread (PT1/4), magnet option (-S), and basic mounting style match your original unit.
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