The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X50-20H 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. Ø80mm bore, 50mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X50-20H is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw provides a 20 mm adjustment range, allowing you to fine-tune the stroke end position without removing the cylinder. It delivers a push force of 2513 N at 0.5 MPa and uses a 25 mm diameter piston rod.
This model is fitted with Viton (FKM) seals, extending its operating temperature range to 0–150 °C, making it suitable for high-heat or aggressive environments where standard TPU seals would degrade. The body length A(SCJ) is 239 mm, and it features an adjustable air cushion for smooth deceleration. The port size is PT3/8.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X50-20H |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 20 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. |
| ×50 | 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.
In packaging machines operating in heated zones, the 20 mm adjustment range lets operators quickly fine-tune the end stop for different box sizes without swapping the cylinder, while the Viton seals handle the sustained 0–150 °C ambient temperature.
During the setup of a new welding fixture, the adjustable stroke allows engineers to precisely set the clamp's final position to accommodate slight variations in workpiece thickness, with 2513 N of push force at 0.5 MPa providing a secure hold.
On a high-cycle stamping press, the stroke end screw can be periodically adjusted to compensate for mechanical wear on tooling or bump stops, maintaining consistent press depth and extending the service life of the tooling set.
Select the SCJ80X50-20H when you need a robust 80 mm bore cylinder with the ability to dial in the stroke end on the machine. If 2513 N of push force at 0.5 MPa is insufficient, stepping up to the 100 mm bore provides 3927 N. For applications that do not require in-field stroke adjustment, a fixed-stroke SC80X50 cylinder is a simpler alternative. As a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with an 80 mm bore, 50 mm nominal stroke, a 20 mm adjustment range, PT ports, basic mounting, and Viton seals.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. The maximum operating force at 0.9 MPa is 4523 N push. Because it is a single-rod cylinder, the push force is greater than the pull force due to the area of the 25 mm rod.
A rear-cap screw sets the stroke end position within a 20 mm range, shortening the 50 mm nominal stroke. It is not a locking device; the piston will drift if air pressure is lost. To hold a load without live pressure, you must add an external rod brake or a pilot-operated check valve.
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.