Airtac SCJ40 Standard Cylinder SCJ40X400-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-20S 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. Ø40mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke400 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X400-20S
The SCJ40X400-20S is a 40 mm bore double-acting single-rod cylinder with a rear adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction, letting you fine-tune the 400 mm nominal stroke without removing the cylinder. At 0.5 MPa it delivers 628 N push and 528 N pull, and the 16 mm diameter piston rod with M12x1.25 male thread handles moderate side loads in tie-rod construction.
The built-in magnet (-S suffix) allows CMSG, DMSG, or EMSG reed and solid-state sensors to clamp directly onto the barrel for end-of-stroke or mid-position sensing. TPU seals with PT1/4 ports and a 21 mm air cushion ensure quiet deceleration, with a body length A of 185 mm plus stroke. This model is a genuine AirTAC component, ready for commissioning trials and format changeovers.
Airtac SCJ40 Standard Cylinder SCJ40X400-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 20 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 SCJ40X400-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SCJ40 Standard Cylinder SCJ40X400-20S Is Used
Commissioning & Setup
Fine-tune the stroke end during machine commissioning without swapping cylinders or machining hard stops, saving hours of mechanical adjustment on a 400 mm stroke axis.
Wear Compensation
Compensate for tooling or gripper wear over time by adjusting the screw to maintain precise end-of-stroke positioning in automated assembly cells.
Format Changeover
Quickly adapt the stroke for different product sizes on packaging or labelling lines by turning the rear screw, eliminating the need for multiple fixed-stroke cylinders.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-20S the Right Cylinder?
Choose the SCJ40X400-20S when you need to dial in the stroke end on a 40 mm bore platform without adding external hard stops. If you require more force, step up to the SCJ50 series which delivers 982 N push at 0.5 MPa; if space or weight is a constraint, the SCJ32 offers 402 N push. For applications where the stroke never changes, the fixed-stroke SC40X400 eliminates the adjuster and is slightly shorter. A direct replacement must match the 40 mm bore, 400 mm nominal stroke, 20 mm adjust range, PT1/4 ports, and the -S magnet option. At 400 mm stroke, ensure the rod is guided externally or use a guided cylinder if side loads exceed the rod bearing capacity.
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 SCJ40 Standard Cylinder SCJ40X400-20S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 128 kgf. The adjustable screw does not alter the force output.
Yes, if you need the adjustable stroke feature. The SCJ40X400-20S shares the same bore, rod, and port dimensions as the SC40, but the body is slightly longer to accommodate the rear adjusting screw. Ensure the 20 mm adjust range and the -S magnet option match your sensor requirements.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCJ Adjustable-Stroke Cylinders
Request a Quote for Airtac SCJ40 Standard Cylinder SCJ40X400-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.