The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X450-40S 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X450-40S is a double-acting, single-rod pneumatic cylinder that delivers 1559 N of push force at 0.5 MPa, with a 20 mm rod and PT1/4 ports. Its defining feature is the rear-cap adjusting screw, which provides a 40 mm field-adjustable range to fine-tune the stroke end position without swapping the cylinder. This model includes a built-in magnet, allowing CMSG/DMSG/EMSG sensors to be clamped directly onto the tie-rod barrel for reliable end-of-stroke detection.
With a 450 mm nominal stroke and a 28 mm air cushion, this cylinder is well-suited for mid-stroke transfer and positioning tasks where the final stop point needs to be dialed in during commissioning or after tooling wear. The body length A(SCJ) is 197 mm, making it slightly longer than a fixed-stroke SC of the same bore. Operating on 0.15-1.0 MPa filtered air, it handles speeds from 30-800 mm/s and temperatures from -20 to +70 °C.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X450-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 450 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. |
| ×450 | 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.
The 40 mm adjust range lets technicians dial in the exact stop position for a 450 mm transfer arm during initial machine setup, eliminating the need to shim or reposition hard stops.
In automated clamping or pressing fixtures, the stroke can be incrementally extended via the rear screw to compensate for jaw or pad wear, maintaining consistent clamping force without replacing the cylinder.
On packaging lines handling different box sizes, operators can quickly adjust the stroke end of a 63 mm bore pusher cylinder by up to 40 mm to accommodate a new product format, reducing line downtime.
Choose the SCJ63X450-40S when you need a 63 mm bore cylinder with a 450 mm nominal stroke that can be shortened by up to 40 mm on the machine. If more force is required, step up to the 80 mm bore SCJ series, which provides 2513 N of push force at 0.5 MPa; for a lighter, more compact solution, the 50 mm bore offers 982 N. For applications where the stroke never changes, the fixed-stroke SC63X450 is a simpler, more cost-effective alternative. Because this is a 450 mm stroke, be mindful of side loads—if the rod is not guided externally, consider adding a guide unit or switching to a guided cylinder to prevent rod bending.
As a direct replacement, match this model with another AirTAC SCJ adjustable-stroke cylinder of 63 mm bore, 450 mm nominal stroke, and a 40 mm adjust range. Ensure the replacement has a built-in magnet (-S suffix) and PT ports. This basic mount version uses the cylinder body for fixation, but FA front flange or LB foot mounts are available if needed.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder generates 1559 N of push force and 1402 N of pull force. The maximum push force at 0.9 MPa is 2805 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke.
Yes, if you need the ability to adjust the stroke end. The SCJ63X450-40S has the same 63 mm bore, 450 mm maximum stroke, and port size as the fixed-stroke SC. However, the SCJ body is slightly longer to accommodate the adjusting mechanism, so check your machine's dimensional clearance before swapping.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.