The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-75S 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ63X400-75S is a double-acting, single-rod tie-rod cylinder with a field-adjustable stroke end, providing a 75 mm fine-tuning range on the 400 mm nominal stroke. The rear-cap adjusting screw lets you dial in the exact stroke end position during commissioning or format changes without swapping the cylinder. At 0.5 MPa, it delivers 1559 N of push force and 1402 N of pull force, with a 20 mm rod and M16x1.5 rod thread.
This model includes a built-in magnet (-S suffix), allowing CMSG/DMSG/EMSG reed or solid-state sensors to clamp directly onto the barrel for reliable end-of-stroke sensing. The 63 mm bore features PT1/4 ports, a 28 mm air cushion for smooth deceleration, and a body length A(SCJ) of 197 mm. Operating pressure ranges from 0.15 to 1.0 MPa, with a standard speed of 30-800 mm/s.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 400 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. |
| ×400 | 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.
Quickly adjust the stroke end to accommodate different box heights or product sizes on a packaging line, eliminating the need for mechanical stops and reducing changeover time.
Fine-tune the final clamp position for workpieces of varying thicknesses in CNC machining or welding fixtures, ensuring consistent holding force without crushing delicate parts.
During new machine commissioning, the 75 mm screw adjustment allows engineers to experimentally determine the optimal actuator stroke on the fly, then lock it in for production.
Choose this 63 mm bore when your application needs more force than the 40 mm bore (628 N push at 0.5 MPa) but does not require the bulk of an 80 mm bore (2513 N push). The 75 mm adjustment range is ideal for processes where the end position may need significant re-tuning over time. If your stroke length is fixed and never changes, a standard SC63X400 fixed-stroke cylinder is a simpler, more cost-effective alternative.
For this 400 mm stroke, be mindful of side loads that can cause rod bending or uneven seal wear. If the load is not guided externally, use an external guide rail or switch to a guided cylinder to protect the rod and bearings. This SCJ63X400-75S is a direct replacement for any AirTAC SCJ cylinder of the same bore, nominal stroke, 75 mm adjust range, PT port thread, and built-in magnet.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder provides 1559 N of push force and 1402 N of pull force. The maximum push force at 0.9 MPa is 2805 N. The adjustable stroke screw does not alter the cylinder's output force.
Yes, if you need the ability to adjust the stroke end. The SCJ shares the same mounting dimensions and port locations as the SC series. Ensure the 75 mm adjustment range is sufficient for your needs, and match the bore, nominal stroke, magnet option, and port thread for a direct physical interchange.
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