The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-50H 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X75-50H is a double-acting, single-rod tie-rod cylinder that puts a 50 mm field-adjustable stroke end at your fingertips. At 0.5 MPa it delivers 1559 N of push force and 1402 N on the pull stroke, driven through a 20 mm diameter piston rod. The rear-cap adjusting screw lets you fine-tune the stroke end position anywhere within that 50 mm window without removing the cylinder from the machine—ideal for commissioning trials, format changeovers, or compensating for tooling wear.
This variant is built with Viton (FKM) seals, extending the operating temperature range from the standard -20 to +70 °C up to 0 to +150 °C, making it suitable for hot environments or applications with aggressive media. The body length A(SCJ) is 197 mm, and the cylinder includes an adjustable air cushion (28 mm long) to decelerate the piston smoothly at end of travel. Ports are PT1/4 with an M16×1.5 rod thread, matching the standard SCJ63 mounting ecosystem.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-50H |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 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. |
| ×75 | 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.
A packaging line running multiple box sizes uses the 50 mm adjust screw to quickly reset the pusher end-stop between batches. Operators dial in the exact stroke end for each SKU without swapping cylinders or adding mechanical hard stops.
In a heated press or drying oven, the Viton seals maintain integrity up to 150 °C while the adjustable stroke lets technicians compensate for thermal expansion of the tooling. The 1559 N push force at 0.5 MPa provides consistent clamping pressure.
During machine commissioning, the rear screw allows fine-tuning of the actuator stroke end to match the actual mechanical assembly. Later, as gripper pads or tooling wear, maintenance staff can advance the stroke end by a few millimetres to restore full engagement without replacing parts.
Choose the SCJ63 when you need the 1559 N push force at 0.5 MPa that bridges the gap between the 40 mm bore (628 N) and the 80 mm bore (2513 N). If your stroke is fixed and you never need to tweak the end position, the standard SC63 fixed-stroke cylinder is a simpler, slightly shorter alternative. For applications where the rod end travels in an arc, add the TC centre trunnion mount (F-SC63TC) to let the whole cylinder pivot. To replace an existing SCJ63X75-50H, match the 63 mm bore, 75 mm nominal stroke, 50 mm adjust range, PT ports, basic mounting, and Viton seal material—any deviation in the adjust range or seal compound will alter the mechanical envelope or temperature rating.
Adjustable-stroke checklist
At 0.5 MPa the cylinder produces 1559 N pushing and 1402 N pulling. The rear adjusting screw only sets the physical stroke end position within a 50 mm range—it does not alter the bore area, operating pressure, or output force. Push force is always higher than pull force because the single rod reduces the piston area on the return side.
Yes, provided the original unit is an SCJ63 with a 75 mm nominal stroke, 50 mm adjust range, PT ports, and Viton seals. The mounting style must also match—this is a basic (no bracket) configuration. If your original had a magnet, foot mount, or trunnion, you will need the corresponding suffix code (e.g. SCJ63X75-50SH for magnet + Viton).
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