Airtac SCJ40 Standard Cylinder SCJ40X400-40
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø40mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke400 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X400-40
The SCJ40X400-40 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the rear cap. A 40 mm adjustment screw lets you shorten the 400 mm nominal stroke without remounting the cylinder, which is invaluable during commissioning or format changeovers on packaging and assembly lines. The 16 mm diameter piston rod and 21 mm air cushion work together to provide smooth, controlled motion through the entire stroke.
With a 40 mm bore, this cylinder delivers 628 N of push force at 0.5 MPa and up to 1130 N at 0.9 MPa, making it a capable mid-range actuator. The tie-rod construction keeps it serviceable, and the PT1/4 ports are standard. The body length A(SCJ) is 185 mm, providing a compact footprint for its stroke class. This genuine AirTAC unit is ready to ship for quick machine upgrades.
Airtac SCJ40 Standard Cylinder SCJ40X400-40 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 40 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.
Theoretical Output Force (Ø40mm)
| 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.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X400-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ40 Standard Cylinder SCJ40X400-40 Is Used
Commissioning & Setup
Field technicians can dial in the exact 400 mm stroke end-stop during initial machine setup without cutting rods or adding external hard stops, reducing commissioning time.
Product Changeover
On a packaging line, the 40 mm adjustment range allows operators to quickly reset a pusher stroke for a new box size, minimizing downtime between production runs.
Wear Compensation
In clamping or pressing applications, the rear screw can be advanced slightly over time to compensate for tooling wear, maintaining consistent force application without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-40 the Right Cylinder?
Choose the SCJ40X400-40 when you need a mid-stroke actuator with in-situ stroke adjustment up to 40 mm. If your force requirement is lower, stepping down to a 32 mm bore reduces push force to 402 N at 0.5 MPa. For higher force, the 50 mm bore provides 982 N. If stroke adjustment is not required, the fixed-stroke SC series offers a simpler, more cost-effective alternative.
For a direct replacement, match the 40 mm bore, 400 mm stroke, 40 mm adjustment range, PT ports, and basic mounting. At this 400 mm stroke, be mindful of side loads that can cause rod bending; if the load is not perfectly guided, add an external guide rail or consider a guided cylinder to protect the rod and seals. The SCJ uses the standard SC mounting subset, so FA, LB, or TC brackets can be added if needed.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ40 Standard Cylinder SCJ40X400-40 FAQ
The push force is 628 N at 0.5 MPa and 1130 N at 0.9 MPa. The pull force is lower due to the single 16 mm rod, providing 528 N at 0.5 MPa. The rear adjustment screw only changes the stroke end position and does not affect the cylinder's force output.
Yes, if you need the 40 mm stroke adjustment feature. The SCJ40X400-40 shares the same bore, port (PT1/4), and mounting accessories (FA, LB, TC) as the SC40 series. Ensure the slightly longer body length A(SCJ) of 185 mm fits your machine envelope.
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