The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X250-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø250mm bore, 250mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X250-30 is a double-acting, single-rod tie-rod cylinder with a 30 mm rear adjusting screw for fine-tuning the stroke end position. In the 250 mm bore class, it delivers 24544 N of push force and 23562 N of pull force at 0.5 MPa, with a maximum push force of 44178 N at the 0.9 MPa operating limit. The 50 mm diameter piston rod and PT1 inch ports support substantial flow for consistent actuation.
This ISO 6430 class cylinder features a 40 mm adjustable air cushion to decelerate the piston smoothly. The body length A is 409 mm, providing a robust platform for heavy-duty applications. The stroke can be shortened by up to 30 mm from its 250 mm nominal maximum, allowing operators to dial in the exact end position during commissioning or format changes without replacing the cylinder.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X250-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 30 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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, 40 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 | 24544 N | 23562 N |
| 0.7 MPa | 34361 N | — |
| Max (@1.0 MPa) | 5006 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. |
|---|---|
| 250 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -30 | 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 final pressing depth on a large hydraulic-style pneumatic press by adjusting the stroke end screw, accommodating variations in tooling or material stack-up without reprogramming.
Adjust the push stroke on a heavy palletizing system to handle different pallet sizes or product overhangs, using the 30 mm range to perfect the placement position.
Compensate for wear on clamping pads in a large structural welding fixture by incrementally advancing the stroke end with the adjusting screw, maintaining consistent clamping force.
Select the SCJ250X250-30 when you need the high force of a 250 mm bore with the ability to adjust the stroke end by up to 30 mm. If your application requires even more force, stepping up to a larger bore is not an option in this series, so consider a tandem or multi-position cylinder. For a lower force class, the 200 mm bore provides 15708 N of push force at 0.5 MPa. The fixed-stroke SC series is a better choice if you never need to alter the end position. For a direct replacement, match the 250 mm bore, 250 mm nominal stroke, 30 mm adjust range, PT port thread, and basic mounting. At this stroke length, ensure the rod is guided externally or use a guided cylinder if significant side loads are present to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. The maximum push force at the 0.9 MPa operating limit is 44178 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
A screw in the rear cap acts as an internal stop for the piston, allowing you to shorten the stroke end by up to 30 mm from the 250 mm nominal maximum. It does not change the cylinder's force or speed, only the physical end position of the rod's extension.
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