The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X500-20STC 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. Ø63mm bore, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X500-20STC is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering 1559 N of push force at 0.5 MPa. Its rear-cap screw provides up to 20 mm of stroke-end adjustment, making it ideal for commissioning fine-tuning, format changeovers, or compensating for tooling wear without replacing the cylinder. This model features a 20 mm rod, M16x1.5 rod thread, and PT1/4 ports, with a 28 mm air cushion for smooth deceleration.
Built as a robust tie-rod cylinder, the SCJ63 incorporates a built-in magnet and a centre trunnion (TC) mount, supplied with the TCM1 bracket (order code F-SC63TC) for pivoting applications. Operating on filtered air from 0.15 to 1.0 MPa, it delivers 2805 N of push force at the maximum operating pressure of 0.9 MPa. The 500 mm nominal stroke is well within the 1500 mm maximum standard stroke for this bore, ensuring reliable long-stroke performance.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X500-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 20 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. |
| ×500 | 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.
The 20 mm rear adjustment screw allows engineers to precisely dial in the optimal stroke end position during machine setup, eliminating the need to swap cylinders or fabricate custom external stops for a 500 mm throw.
Quickly adjust the pusher stroke for different box or product sizes. The trunnion mount is ideal for the pivoting pusher linkages common in case packers and palletizers, where a 63 mm bore provides the necessary force.
In high-cycle clamping fixtures, the adjustable stroke can be periodically extended to compensate for wear on clamp pads or the workpiece, maintaining consistent clamping force without immediate maintenance.
Select the SCJ63 for applications needing around 1559 N of push force at standard plant pressure. If your load requires more force, stepping up to an 80 mm bore provides 2513 N at the same 0.5 MPa. For a lighter, more compact solution, the 50 mm bore offers 982 N. The adjustable stroke is the key differentiator; if a fixed stroke is sufficient, the standard SC series is the direct alternative. This model is a direct replacement for another AirTAC SCJ63X500-20STC with a centre trunnion mount and magnet.
For a 500 mm stroke, always assess side-loading on the piston rod. If the load is not guided and applies a lateral force, an external guide rail or switching to a guided cylinder is recommended to prevent rod bending and premature seal wear. The centre trunnion mount allows the cylinder body to pivot, which can help compensate for minor misalignments in a single plane.
Adjustable-stroke checklist
Being a single-rod cylinder, push and pull forces differ. At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 0.9 MPa, the push force increases to 2805 N. The theoretical force at 1.0 MPa is 318 kgf.
A rear-cap screw shortens the stroke end position by up to 20 mm from the 500 mm nominal maximum. It does not adjust speed or force. This SCJ63X500-20STC directly replaces any AirTAC SCJ cylinder with the same 63 mm bore, 500 mm nominal stroke, 20 mm adjust range, PT ports, centre trunnion (TC) mount, and built-in magnet.
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