The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X450-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø100mm bore, 450mm nominal stroke, PT1/2 ports and adjustable end cushioning.
The SCJ100X450-20 is a double-acting, single-rod tie-rod cylinder with a 100 mm bore and a nominal stroke of 450 mm, featuring a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. This allows machine builders to dial in the exact stopping position during commissioning or changeovers without replacing the cylinder or adding external hard stops. With a push force of 3927 N at 0.5 MPa and a maximum push of 7068 N at 0.9 MPa, it delivers the substantial thrust needed for pressing, clamping, and heavy positioning tasks.
The 25 mm diameter piston rod and PT1/2 port ensure robust air flow for consistent cycling, while the 29 mm air cushion at each end decelerates the piston quietly and protects the end caps. The body length A(SCJ) is 245 mm, slightly longer than the fixed-stroke SC version to accommodate the adjusting mechanism. Operating on filtered air from 0.15 to 1.0 MPa, this cylinder is suitable for general industrial automation where stroke length must be precisely tuned on-site.
| Model | Airtac SCJ100 Standard Cylinder SCJ100X450-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø100 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/2 |
| Rod thread | M20×1.5 |
| 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, 29 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 | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 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. |
|---|---|
| 100 | Bore size in mm. |
| ×450 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
During machine setup, the 20 mm adjustment screw lets technicians precisely dial in the retract stroke end for a 450 mm linear transfer, compensating for fixture tolerances without re-machining brackets.
In a conveyor stop or lift-and-carry station, the 3927 N push force at 0.5 MPa moves heavy pallets, and the adjustable stroke allows fine-tuning the stop position to accommodate different product sizes.
On a high-cycle clamping press, the stroke-end screw can be advanced over time to take up mechanical wear in the tooling, maintaining consistent clamp force without reprogramming the PLC or changing the cylinder.
Select the SCJ100X450-20 when you need a powerful 100 mm bore actuator with a 450 mm reach that can be fine-tuned by up to 20 mm at the stroke end. If the application demands higher force, stepping up to the 125 mm bore provides 6136 N of push at 0.5 MPa; for a lighter, more compact solution, the 80 mm bore offers 2513 N. For strokes of 300 mm or more, be mindful of side-loading on the rod—consider an external guide rail or a guided cylinder if the load is not perfectly axial. A fixed-stroke SC cylinder is the better choice when the stroke length is permanently fixed and no field adjustment is ever required.
This model is a direct replacement for another AirTAC SCJ100X450-20 adjustable-stroke cylinder with PT ports and basic mounting. When replacing, match the bore, the 450 mm nominal stroke, and the 20 mm adjustment range exactly. If your current unit includes a magnet or a specific mounting bracket, ensure the replacement code carries the same suffix to maintain sensor compatibility and mechanical fit.
Adjustable-stroke checklist
The push force is 3927 N at 0.5 MPa and 7068 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the single 25 mm rod, providing 3681 N at 0.5 MPa. These values are identical to the fixed-stroke SC100 cylinder.
You can replace a fixed-stroke SC100 with an SCJ only if you need the adjustable stroke feature and your machine can accommodate the slightly longer body length (A(SCJ) 245 mm). The mounting, port size (PT1/2), and forces are the same, but you must ensure the 450 mm stroke and 20 mm adjustment range match your application's requirements.
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.