Airtac SCJ250 Standard Cylinder SCJ250X100-20S
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X100-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø250mm bore, 100mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke100 mm
- Stroke adjust-20 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X100-20S
The SCJ250X100-20S is a large-bore, double-acting single-rod pneumatic cylinder engineered for heavy-duty applications where the stroke end position needs field-level fine-tuning. With a 250 mm bore and a 50 mm diameter piston rod, it delivers a substantial 24544 N of push force at 0.5 MPa, scaling up to 44178 N at the maximum operating pressure of 0.9 MPa. The rear-cap adjusting screw provides up to 20 mm of stroke-end adjustment, allowing operators to dial in the exact stopping position without removing the cylinder from the machine.
This model includes a built-in magnet (denoted by the -S suffix), enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the barrel for precise, non-contact position feedback. The cylinder body length A is 409 mm, and it features a 40 mm adjustable air cushion to decelerate the piston smoothly. As a tie-rod cylinder in the ISO 6430 class, it is suited for demanding industrial environments running on filtered air at 0.15-1.0 MPa.
Airtac SCJ250 Standard Cylinder SCJ250X100-20S Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X100-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 20 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.
Theoretical Output Force (Ø250mm)
| 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.
Model Code: Airtac SCJ250 Standard Cylinder SCJ250X100-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×100 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Where the Airtac SCJ250 Standard Cylinder SCJ250X100-20S Is Used
Commissioning & Process Tuning
During the setup of large hydraulic press replacements or heavy material handling systems, the 20 mm adjustable stroke lets commissioning engineers fine-tune the end stop for perfect alignment without swapping out the massive cylinder.
Heavy-Duty Clamping
In foundry or steel mill clamping fixtures, the 24544 N push force securely locks workpieces. The stroke-end screw allows for quick adjustment to accommodate slight variations in part thickness or tooling wear over long production runs.
Large-Scale Diverter Gates
For aggregate or mining conveyor diverters, the SCJ250 provides the raw force to move heavy gates. The adjustable stroke ensures the gate seals perfectly against its frame, compensating for installation tolerances and preventing material leakage.
Is the Airtac SCJ250 Standard Cylinder SCJ250X100-20S the Right Cylinder?
Select the SCJ250 when your application demands the highest force output in the SCJ family, with 24544 N of push force at 0.5 MPa. If your force requirement is lower, stepping down to the 200 mm bore model reduces push force to 15708 N at the same pressure, offering a more compact and cost-effective solution. The 20 mm adjustable stroke range is ideal for commissioning and fine-tuning the end position on large-scale equipment. For applications needing a fixed, non-adjustable stroke, the standard SC250 cylinder is the correct alternative.
This cylinder is a direct replacement for another AirTAC SCJ250 adjustable-stroke unit with a 100 mm nominal stroke, 20 mm adjustment range, PT ports, and a built-in magnet. For strokes of 300 mm or more, carefully evaluate side-loading on the 50 mm rod. If the load is not perfectly guided, an external guide rail or a switch to a guided cylinder is strongly recommended to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ250 Standard Cylinder SCJ250X100-20S FAQ
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force increases to 44178 N. The push force is greater than the pull force because it is a single-rod cylinder.
No, the adjustable stroke is not a speed control. A mechanical screw in the rear cap sets the physical stroke end position, allowing you to shorten the stroke by up to 20 mm. It does not regulate air flow or piston speed. The cylinder's speed is controlled externally by flow control valves in the pneumatic circuit.
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