The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X200-50H is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø80mm bore, 200mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X200-50H is an 80 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you a 50 mm fine-tuning range on the 200 mm nominal stroke. This model is built with Viton (FKM) seals for reliable operation in high-temperature environments from 0 to +150 °C, making it suitable for hot presses, drying ovens, and foundry equipment. The 25 mm diameter piston rod and PT3/8 ports deliver a push force of 2513 N at 0.5 MPa, scaling up to 4523 N at the maximum operating pressure of 0.9 MPa.
A rear-cap adjusting screw lets you precisely dial in the stroke end position without dismounting the cylinder or adding external hard stops, which is invaluable during commissioning and for format changeovers. The SCJ body length A is 239 mm, slightly longer than a fixed-stroke SC of the same bore to house the adjustment mechanism. As a tie-rod cylinder, it is robust and serviceable, with an adjustable air cushion to decelerate the piston smoothly at the end of travel.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X200-50H |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 200 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| 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, 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 | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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. |
|---|---|
| 80 | Bore size in mm. |
| ×200 | Nominal (maximum) stroke length in mm. |
| -50 | 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 50 mm adjustment range allows operators to fine-tune the platen closing position on a heated laminating press, compensating for different material thicknesses while the Viton seals withstand the sustained 150°C operating temperature.
In a high-temperature drying line, this cylinder ejects parts from a conveyor. The adjustable stroke lets you set the precise push-off distance for different product sizes without needing to swap the cylinder.
Used on a casting knockout machine, the SCJ80X200-50H provides a powerful 2513 N push. The stroke-end screw is adjusted to set the hammer impact depth, and the FKM seals resist the ambient heat and airborne contaminants.
Choose this 80 mm bore when your application needs a push force around 2513 N at standard shop air (0.5 MPa). If you require less force, stepping down to the 63 mm bore provides 1559 N of push; for significantly higher force, the 100 mm bore delivers 3927 N at the same pressure. The SCJ adjustable-stroke design is the right choice when your machine requires fine end-position tuning—if the stroke is fixed and never changes, a standard SC cylinder is a more economical alternative. For a direct replacement, match an AirTAC SCJ cylinder with an 80 mm bore, 200 mm nominal stroke, a 50 mm adjustment range, PT ports, and Viton seals. At a 200 mm stroke, side-loading is generally manageable, but for any off-axis force, an external guide rod or a guided cylinder is recommended to protect the rod bearing and seal.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 2513 N and the pull force is 2268 N (reduced due to the 25 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force is 513 kgf. The adjustable stroke screw does not alter the cylinder's force output.
No. The SCJ80X200-50H is a standard double-acting cylinder and will not hold its position if air pressure is exhausted or lost. The adjustable air cushion only decelerates the piston at the stroke end, and the stroke adjustment screw only sets the end position—neither feature acts as a mechanical lock. If load holding is required upon pressure loss, you must add an external pilot-operated check valve or a rod brake.
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