The AirTAC Airtac SCJ125 Standard Cylinder SCJ125X350-75 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. Ø125mm bore, 350mm nominal stroke, PT1/2 ports and adjustable end cushioning.
The SCJ125X350-75 delivers a robust 6136 N push force at 0.5 MPa (11045 N at 0.9 MPa), making it a strong choice for heavy-duty applications needing field-tunable stroke. Its rear adjusting screw provides a 75 mm stroke-end reduction range, allowing operators to fine-tune the piston stop without removing the 32 mm rod cylinder from the machine.
This ISO 6430 class tie-rod cylinder uses a PT1/2 port and M27x2 rod thread, with a 28 mm air cushion to decelerate large loads. The body length A(SCJ) is 266 mm, and the pull force is 5734 N at 0.5 MPa, reflecting the single-rod design's area difference.
| Model | Airtac SCJ125 Standard Cylinder SCJ125X350-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/2 |
| Rod thread | M27×2 |
| 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 – 500 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 | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 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. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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.
Fine-tune the pressing depth on a hydraulic-style pneumatic press by adjusting the rear screw, accommodating variations in part thickness or tooling wear without disassembling the setup.
Adjust the final push position of a pallet layer squaring arm to handle different pallet sizes or box dimensions, using the 75 mm range to set the precise end stop for each format.
Set the exact clamping stroke for large weldments or castings during fixture commissioning. The adjustable stroke lets operators find the optimal grip point, preventing part deformation from over-travel.
Choose the SCJ125X350-75 when you need to dial in a stroke end point during commissioning or format changes on heavy tooling. If 6136 N of push force is more than required, stepping down to the 100 mm bore (3927 N push at 0.5 MPa) reduces actuator size and air consumption. For applications needing a fixed, non-adjustable stroke, the standard SC125X350 is a simpler alternative. At a 350 mm stroke, ensure the rod is supported against side loads; an external guide rail or switching to a guided cylinder is recommended if the load is not perfectly axial. A direct replacement must match the 125 mm bore, 350 mm nominal stroke, 75 mm adjust range, PT port thread, and basic mounting style.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 6136 N and the pull force is 5734 N. The maximum push force at the 0.9 MPa operating limit is 11045 N. The pull force is lower because the 32 mm piston rod reduces the effective area on the return stroke.
Yes, if you need the ability to shorten the stroke end by up to 75 mm. The SCJ125X350-75 is a direct dimensional match for an SC125X350 in terms of bore, port size (PT1/2), and mounting interfaces, but the body is slightly longer to house the adjusting screw mechanism.
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