The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X300-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X300-40 is a 63 mm bore double-acting single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap screw lets you shorten the stroke by up to 40 mm without removing the cylinder, giving 1559 N of push force at 0.5 MPa (2805 N at 0.9 MPa) for precise end-position tuning.
Its 20 mm rod and PT1/4 ports handle mid-range automation tasks. The tie-rod body (A length 197 mm) includes a 28 mm air cushion to decelerate the piston quietly. Standard TPU seals and PT threads suit filtered-air systems from -20 to +70 °C.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X300-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 40 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. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -40 | 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.
Adjust the rear screw to dial in the exact retract position during machine commissioning, compensating for tooling tolerances without reprogramming the controller.
Quickly reset the stroke end for different product sizes on a packaging line. The 40 mm range handles multiple SKU formats with a single cylinder model.
As gripper pads or pusher faces wear down over thousands of cycles, advance the stroke end slightly via the adjusting screw to maintain consistent part contact.
Choose this 63 mm bore when a 50 mm cylinder (982 N push at 0.5 MPa) is marginal and an 80 mm (2513 N) is oversized. The 40 mm adjustment range is ideal for commissioning trials or format changeovers on a 300 mm stroke. If you need a fixed stroke, pick the SC63X300; for guided motion, add an external guide or use a guided cylinder.
For strokes of 300 mm and above, watch for side-loading on the rod. If the load is not perfectly axial, fit an external guide rail or switch to a guided cylinder to prevent rod bending and seal wear. The SCJ63X300-40 replaces another AirTAC SCJ of the same bore, nominal stroke, 40 mm adjust range, PT port, and basic mount.
Adjustable-stroke checklist
At 0.5 MPa, push force is 1559 N and pull force is 1402 N (the rod reduces the piston area on the return). At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N.
Physically yes, if the extra body length for the adjusting screw fits your machine. The SCJ adds stroke-end adjustability up to 40 mm shorter, while the fixed-stroke SC has no rear screw. Mounting, port, and rod dimensions are identical.
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