Airtac SCJ40 Standard Cylinder SCJ40X250-100SFA
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-100SFA is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke250 mm
- Stroke adjust-100 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X250-100SFA
The SCJ40X250-100SFA is a 40 mm bore double-acting single-rod cylinder with a 250 mm nominal stroke and a substantial 100 mm rear-end stroke adjustment range. This allows machine builders to fine-tune the piston's end position across a wide window without swapping the cylinder, making it ideal for commissioning trials or formats that change frequently. At 0.5 MPa, it delivers 628 N of push force, while the 16 mm diameter piston rod provides robust guidance for offset loads.
This model is factory-equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG solid-state or reed sensors, and an FA front rectangular flange (F-SC40FA) for secure panel mounting on the rod end. The body length A(SCJ) is 185 mm, slightly longer than a fixed-stroke SC to house the adjusting screw mechanism, and the standard PT1/4 port supplies air efficiently for the 30-800 mm/s speed range.
Airtac SCJ40 Standard Cylinder SCJ40X250-100SFA Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-100SFA |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 100 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 SCJ40X250-100SFA
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ40X250-100SFA Is Used
Commissioning & Setup
The 100 mm adjustment range lets technicians dial in the exact stop position during initial machine setup without fabricating custom hard stops, significantly reducing commissioning time on new automation cells.
Product Changeover
On packaging or sorting lines handling multiple product sizes, the stroke can be quickly reset via the rear screw to accommodate different box heights or part dimensions without mechanical disassembly.
Wear Compensation
In high-cycle clamping or pressing fixtures, the adjustable stroke can be extended over time to compensate for wear on tooling or seals, maintaining consistent clamping force and part quality.
Is the Airtac SCJ40 Standard Cylinder SCJ40X250-100SFA the Right Cylinder?
Choose this 40 mm bore SCJ when your application needs a push force of around 628 N at standard plant pressure, and the 100 mm stroke-end adjustability is critical for setup flexibility. If you need more force, stepping up to the 50 mm bore SCJ provides 982 N of push force at the same 0.5 MPa. For a simpler, cost-reduced setup where the stroke is fixed and never needs field changes, a standard SC40X250 cylinder is a direct alternative without the adjusting screw. To ensure a drop-in replacement, match the 40 mm bore, 250 mm nominal stroke, 100 mm adjustable range, PT port thread, and FA front flange mounting.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ 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 SCJ40X250-100SFA FAQ
The rear cap has an adjusting screw that limits how far the piston can retract. By turning the screw, you can shorten the stroke end by up to 100 mm from the 250 mm maximum. It sets the mechanical end position and does not adjust air pressure or speed. The push force remains 628 N at 0.5 MPa regardless of the stroke setting.
Yes, this is a direct replacement if your existing cylinder has a 40 mm bore, 250 mm nominal stroke, and a 100 mm adjustment range. This model includes a magnet for sensors and an FA front flange. Verify that your port thread is PT and that the mounting hole pattern for the F-SC40FA flange matches your machine.
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 SCJ40X250-100SFA
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.