The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X125-75 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X125-75 is a 40 mm bore, double-acting, single-rod pneumatic cylinder with a rear adjusting screw that lets you shorten the stroke end by up to 75 mm without removing the cylinder from the machine. Its 16 mm diameter piston rod delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a strong mid-range actuator for applications where the final stop position needs field-level fine-tuning.
This tie-rod cylinder uses PT1/4 ports and an M12x1.25 rod thread, with a body length of 185 mm for the SCJ configuration. The built-in variable air cushion (21 mm long) decelerates the piston smoothly at end-of-travel, and the standard TPU seals operate reliably from -20 to +70 °C. The 75 mm adjustment range is particularly useful for commissioning trials or format changeovers where the exact stroke must be dialed in on-site.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X125-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 125 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. |
| ×125 | 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.
Dial in the exact stroke end position during initial machine commissioning. The 75 mm adjustment range allows engineers to fine-tune the actuator's stop point without swapping cylinders or machining external hard stops.
Quickly adapt to different product sizes on packaging or assembly lines. Operators can adjust the stroke end by up to 75 mm to accommodate a new box height or component length, minimizing downtime between batches.
Take up mechanical play or tooling wear over time. The rear screw lets maintenance teams restore the precise end-of-stroke position by advancing the stop point by up to 75 mm, extending the effective service life of the tooling.
Choose the SCJ40X125-75 when you need to adjust the stroke end position by up to 75 mm during setup or production changes. If 628 N of push force at 0.5 MPa is insufficient, stepping up to the 50 mm bore (SCJ50 series) provides 982 N of push force. For applications that do not require field adjustability, the standard fixed-stroke SC40 series offers a simpler, more compact solution. If side loads are a concern, consider adding an external guide rail.
For direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 125 mm nominal stroke, 75 mm adjustment range, PT1/4 ports, and the same basic mounting configuration. The rear adjusting screw is the defining feature; ensure the replacement unit carries the identical -75 adjustment code to maintain the full tuning range on your equipment.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this cylinder generates 628 N of push force (full bore area) and 528 N of pull force (annular area minus the 16 mm rod). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1256 N.
Only if you need the adjustable stroke feature. The SCJ40X125-75 has a longer body (A=185 mm) than a fixed-stroke SC40 to house the rear adjusting screw. It is a direct dimensional replacement only for another AirTAC SCJ40 cylinder with the same 125 mm nominal stroke and 75 mm adjustment range.
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