Airtac SCJ40 Standard Cylinder SCJ40X350-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X350-20 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, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke350 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X350-20
The SCJ40X350-20 is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal 350 mm stroke, featuring a rear-cap adjusting screw that provides 20 mm of field-adjustable stroke-end retraction. This allows operators to fine-tune the piston's stopping position without dismounting the cylinder or adding external hard stops, making it ideal for commissioning trials and format changeovers. The 16 mm diameter piston rod and PT1/4 ports deliver a push force of 628 N at 0.5 MPa, scaling to 1130 N at 0.9 MPa.
Built on the proven AirTAC SC tie-rod platform, the SCJ body length A is 185 mm plus stroke, with an integrated 21 mm air cushion for smooth deceleration. The standard TPU seals and PT threads suit general industrial environments from -20 to +70 °C. This model is a basic configuration without a magnet or mounting bracket, ready to accept the SCJ-compatible FA, LB, or TC mounting accessories.
Airtac SCJ40 Standard Cylinder SCJ40X350-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X350-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 350 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 SCJ40X350-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SCJ40X350-20 Is Used
Commissioning & Setup
The 20 mm adjustment range lets technicians quickly fine-tune the end-of-stroke position during initial machine setup without swapping cylinders or machining custom stops, speeding up the commissioning process.
Product Format Changeover
On packaging or assembly lines, the adjustable stroke allows operators to adapt the cylinder's reach for different product sizes or tooling offsets in minutes, minimizing downtime between production runs.
Wear Compensation
In clamping or pressing applications, the stroke can be incrementally extended over time to compensate for tooling or pad wear, maintaining consistent contact force without reprogramming the machine.
Is the Airtac SCJ40 Standard Cylinder SCJ40X350-20 the Right Cylinder?
Choose the SCJ40X350-20 when you need to dial in a 350 mm stroke end by up to 20 mm on the machine, a capability the fixed-stroke SC40 lacks. If your force requirement is lower, the SCJ32 provides 402 N of push at 0.5 MPa; for more force, step up to the SCJ50 which delivers 982 N. The adjustable stroke is purely a position-setting feature—it does not alter the cylinder's force output or speed.
For a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 350 mm nominal stroke, 20 mm adjust range, PT1/4 ports, and the same basic mounting. At this 350 mm stroke length, ensure the rod is not subjected to significant side loads; if lateral forces are present, pair the cylinder with an external guide rail or consider a guided cylinder 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 SCJ40 Standard Cylinder SCJ40X350-20 FAQ
The cylinder delivers a push force of 628 N at 0.5 MPa and 1130 N at 0.9 MPa. The pull force is lower due to the 16 mm rod reducing the piston area on the retract side, providing 528 N at 0.5 MPa.
Yes, if you need the adjustable stroke feature. The SCJ40X350-20 shares the same bore, port size (PT1/4), and mounting footprint as the SC40. Ensure the slightly longer body length A (185 mm + stroke) fits your space and that you match the 20 mm adjust range for the same stroke-end flexibility.
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