The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X185-50S 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, 185mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X185-50S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw gives you up to 50 mm of retraction adjustment from the 185 mm nominal maximum, so commissioning technicians and line operators can dial in the exact stop position without swapping cylinders or adding external hard stops. The 20 mm diameter piston rod and 28 mm air cushion work together to handle deceleration smoothly, and the PT1/4 ports keep plumbing straightforward.
At 0.5 MPa this bore delivers 1559 N pushing and 1402 N pulling, rising to 2805 N push at the 0.9 MPa maximum operating pressure. The built-in magnet (the -S suffix) lets you clamp CMSG, DMSG, or EMSG reed or solid-state sensors directly onto the tie-rod barrel for non-contact position feedback. The body length A(SCJ) is 197 mm, and the cylinder is rated for standard strokes up to 1500 mm in this bore size.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X185-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 185 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. |
| ×185 | 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.
Fine-tune the retracted stop position during new-equipment runoff. The 50 mm adjustment range lets you shift the stroke end incrementally while observing part fit or sensor timing, then lock the screw once the sweet spot is found.
When a cartoner or case packer switches between product sizes, the SCJ63X185-50S lets operators adjust the pusher stroke end by hand. No need to stock multiple fixed-stroke cylinders for each format.
In welding or assembly jigs where clamp pads wear over time, the adjustable screw takes up the lost travel. The 1559 N push force at 0.5 MPa provides ample clamping pressure for medium-gauge steel or aluminium workpieces.
Choose the SCJ63 bore when the 50 mm bore's 982 N push at 0.5 MPa is borderline and you need the next step up in force without jumping to the larger 80 mm frame. If your application requires a fixed, non-adjustable stroke, the standard SC63 series removes the rear screw and is a simpler, lower-cost alternative. For guided or side-loaded moves, pair this cylinder with an external linear guide or consider a guided cylinder instead.
This model is a direct dimensional and functional replacement for any AirTAC SCJ63 cylinder with a 185 mm nominal stroke, 50 mm adjustable range, PT ports, basic mounting, and a magnet. For strokes of 300 mm or longer, evaluate side-load forces on the 20 mm rod; an external guide rail or a guided cylinder assembly will prevent rod bending and premature seal wear.
Adjustable-stroke checklist
Push force is 1559 N at 0.5 MPa, 2182 N at 0.7 MPa, and 2805 N at the 0.9 MPa maximum operating pressure. Pull force is slightly lower due to the 20 mm rod area: 1402 N at 0.5 MPa. The adjusting screw does not alter the force; it only sets the stroke end position.
Yes, provided the original cylinder has the same 185 mm nominal stroke, 50 mm adjustment range, PT ports, and basic mounting. The -S magnet adds sensor compatibility without changing the envelope or mounting dimensions. If your original did not have a magnet, you can still use this model and simply leave the sensors off.
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