The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X500-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X500-75 delivers a nominal 500 mm stroke that you can fine-tune on the machine by up to 75 mm using the rear-cap adjusting screw, giving you a true field-adjustable stroke end without swapping the cylinder. In the 40 mm bore class, this double-acting, single-rod cylinder produces 628 N of push force and 528 N of pull force at 0.5 MPa, making it a solid mid-range actuator for tasks where the stroke length needs to be dialed in during commissioning or changeover.
This tie-rod cylinder uses a 16 mm diameter piston rod with an M12x1.25 male thread and PT1/4 ports. Its adjustable air cushion is 21 mm long, and the SCJ body length A is 185 mm, slightly longer than a fixed-stroke SC to house the adjustment mechanism. The operating pressure range is 0.15–1.0 MPa, and the standard speed range is 30–800 mm/s.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X500-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 75 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. |
| ×500 | Nominal (maximum) stroke length in mm. |
| -75 | 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 75 mm adjustment range lets technicians precisely set the end-of-stroke position during machine commissioning, eliminating the need to fabricate custom external hard stops for a 500 mm travel.
On a packaging line, quickly adjust the pusher stroke from 425 mm to 500 mm to handle a new box size without mechanical modifications, reducing downtime between product runs.
In a clamping or pressing fixture, use the screw to advance the stroke end by a few millimeters to compensate for pad or tooling wear over time, maintaining consistent clamping force without replacing parts.
Step up to the 50 mm bore (SCJ50, 982 N push at 0.5 MPa) if this 40 mm model's 628 N push force is marginal for your load. For a fixed, repeatable stroke with no field adjustment, the standard SC40 is a simpler choice. This SCJ40X500-75 is a direct replacement for another AirTAC SCJ40 adjustable-stroke cylinder with a 500 mm nominal stroke, 75 mm adjust range, PT ports, and basic mounting. For strokes of 500 mm, be mindful of side loading on the fully extended rod. If your application imposes a significant radial load, pair the cylinder with an external guide rail or consider a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it delivers 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The rear adjusting screw only changes the stroke end position and does not alter the cylinder's output force.
Only if you need the field-adjustable stroke feature. The SCJ40 body is longer (A=185 mm) than the standard SC40 to house the adjusting screw. It is a direct dimensional match for another AirTAC SCJ40X500-75 with PT ports and basic mounting.
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