The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø63mm bore, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X350-75 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides up to 75 mm of retraction from the 350 mm nominal stroke, so you can dial in the exact stopping position during commissioning or changeover without swapping cylinders or adding external hard stops. With a 20 mm rod, PT1/4 ports, and a 28 mm air cushion, it handles 1559 N of push force at 0.5 MPa and up to 2805 N at the 0.9 MPa maximum operating pressure.
This genuine AirTAC SCJ cylinder uses a tie-rod construction and is built for filtered-air service from 0.15 to 1.0 MPa. The adjustable screw sets only the stroke end—it does not alter force or speed. The 350 mm stroke is well within the 1500 mm maximum standard stroke for the 63 mm bore, and the body length A(SCJ) is 197 mm plus stroke, making it a direct dimensional match when replacing an existing SCJ63 of the same configuration.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 75 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. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -75 | 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 75 mm adjustment range lets technicians fine-tune the end position on a new assembly line without re-machining mounts or cutting hard stops, speeding up initial machine runoff.
On packaging or filling lines that run multiple product sizes, operators can quickly reset the cylinder stroke to match a new box height or bottle diameter by turning the rear screw.
In clamping or pressing fixtures where tooling surfaces wear over time, the SCJ63X350-75 lets you advance the stroke end to maintain consistent contact force without replacing the tooling or the cylinder.
Choose the 63 mm bore when the 50 mm bore’s 982 N push at 0.5 MPa is borderline and you need the step up to 1559 N without moving to the larger 80 mm frame. If your application does not require field-adjustable stroke, the fixed-stroke SC63 is a simpler, lower-cost alternative. For a drop-in replacement, match bore (63), nominal stroke (350), adjust range (75), port thread (PT), and mounting style—this basic-body model uses no additional bracket. At 350 mm of stroke, side-load and rod buckling become real concerns; if the load is not guided externally, consider adding a guide rod or switching to a guided cylinder to protect the rod bearing and seal.
Adjustable-stroke checklist
Push force uses the full 63 mm bore area: 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 lower because the 20 mm rod reduces the effective piston area—expect 1402 N at 0.5 MPa. The adjusting screw does not change these force values.
Yes, provided the bore, nominal stroke, and port thread match. The -75 suffix indicates a 75 mm adjustment range; if your current cylinder has a different range (e.g., -50), the replacement will alter the available stroke-end travel. Always match the adjust code to maintain the same setup envelope, or confirm the new range is acceptable for your process.
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