The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X500-50STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X500-50STC is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides a 50 mm field-adjustable stroke range, letting you fine-tune the end position without swapping the cylinder. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force at 0.5 MPa, making it a robust choice for medium-duty automation tasks.
This model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion (TC) mount, supplied with the TCM1 bracket, for pivoting applications. The 500 mm nominal stroke is well within the 1500 mm maximum standard stroke for this bore, and the 28 mm air cushion provides smooth, adjustable deceleration at stroke ends.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X500-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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 50 mm rear adjustment screw allows technicians to precisely calibrate the stroke end position during machine commissioning, eliminating the need for custom shims or hard stops.
Used on a sorting conveyor with a pivoting arm, the TC mount and adjustable stroke let operators fine-tune the diverter's throw to handle different package sizes without changing the actuator.
In a clamping or pressing fixture, the adjustable stroke can be periodically extended to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force over time.
Choose the SCJ63 when you need around 1559 N of push force at 0.5 MPa. If your force requirement is lower, stepping down to an SCJ50 bore provides 982 N; for higher demands, the SCJ80 bore offers 2513 N. This adjustable-stroke model is ideal when the final stroke length must be dialled in during commissioning or format changes, unlike a fixed-stroke SC cylinder.
For a direct replacement, match an AirTAC SCJ cylinder with a 63 mm bore, 500 mm nominal stroke, a 50 mm adjust range (-50), PT port thread, centre trunnion (TC) mounting, and a built-in magnet (-S). At this 500 mm stroke, ensure the rod is adequately supported against side loads; if significant lateral force is present, consider adding an external guide rail or switching to a guided cylinder assembly.
Adjustable-stroke checklist
At 0.5 MPa operating pressure, the theoretical push force is 1559 N and the pull force is 1402 N. The push force is higher because the single rod reduces the effective piston area on the return stroke. Maximum push force at 0.9 MPa is 2805 N.
A rear-cap screw allows you to shorten the stroke end by up to 50 mm from the 500 mm nominal maximum. This is a mechanical stroke limiter, not a force or speed control. It can replace an SC fixed-stroke cylinder if you need field adjustability, provided the bore, mounting (TC), magnet option, and port thread (PT) match.
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