The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X70-50 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. Ø40mm bore, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X70-50 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, offering a nominal 70mm maximum stroke that can be shortened by up to 50mm via the rear-cap adjusting screw. With a 40mm bore and 16mm piston rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a versatile actuator for applications requiring precise end-position tuning during commissioning or format changes.
This tie-rod cylinder features a PT1/4 port, an M12x1.25 rod thread, and a 21mm air cushion for smooth deceleration. The body length A(SCJ) is 185 mm, slightly longer than a fixed-stroke SC to accommodate the adjustment mechanism. Operating on filtered air from 0.15 to 1.0 MPa, it's a genuine AirTAC solution for dynamic stroke adjustment without swapping the cylinder.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X70-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 70 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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, 21 mm |
| Max stroke | Up to 1200 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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.
Quickly dial in the exact stroke end position on new automation equipment without fabricating custom stops, reducing integration time and cost.
In clamping or pressing fixtures, the 50mm adjustment range can be used to take up mechanical wear on tooling or workpieces over time, maintaining consistent pressure.
Adjust the actuator's end-stop for different product sizes on a packaging or assembly line, enabling rapid changeovers with a simple screw adjustment instead of a cylinder swap.
Choose the SCJ40X70-50 when your process demands on-machine stroke fine-tuning within a 50mm window, eliminating the need for external hard stops. If 628 N of push force at 0.5 MPa is insufficient, stepping up to a 50mm bore provides 982 N of push force. For applications where the stroke is permanently fixed, a standard SC series cylinder is a more economical choice. A direct replacement must match the 40mm bore, 70mm nominal stroke, 50mm adjust range, PT port thread, and basic mounting.
Adjustable-stroke checklist
A rear-cap adjusting screw limits the piston's retraction, allowing you to shorten the stroke end by up to 50mm from the 70mm nominal maximum. This is a mechanical stop for position control, not a force or speed regulator.
At 0.5 MPa, the theoretical push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. The pull force is lower due to the area of the 16mm piston rod.
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.