This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X50-50, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X50-50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X50-50
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50
The AirTAC SIJ125X50-50 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 50mm on-site (nominal 50mm is the maximum). The direct replacement is the SAIJ125X50-50, matching the interface, force, and mounting.
The SAIJ upgrade uses an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. The stop screw sets end position but is NOT a load lock; use SAIL/BSAI or an external rod lock for held loads. This SKU lacks a -S magnet and cannot take a switch.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X50-50 |
| Bore size | Ø125 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ125X50-50 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAIJ125X50-50 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50 Is Used
Press Fit Tuning
Field-trim the 0-50mm extend stroke to set precise bearing press depth without machining new hard stops.
Divertor Adjustment
Dial in the exact diverter finger extension on-site to handle varying package widths on the line.
Pallet Stop Positioning
Adjust the extend stop screw to fine-tune pallet halt locations dynamically without repositioning mounts.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50 with the SAIJ125X50-50
Replace the SIJ125X50-50 directly with the SAIJ125X50-50 (direct, same ISO 15552 mounts: Basic, FA, LB, TC). The 50mm adjust window lets you tune the extend end-position precisely on-site. This non-magnetic SKU cannot take a switch; add -S for CS1-B/DS1-B sensor accuracy if needed. Because stroke is under 300mm, side-load wear is minimal. Remember the stop screw is not a brake; for load-holding without live air, specify an external rod lock or pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X50-50
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50 FAQ
Yes, the SIJ125X50-50 is discontinued. The direct replacement is the SAIJ125X50-50. It shares the same ISO 15552 interface, 125mm bore, 50mm stroke, 50mm adjust window, G1/2 port, and mounting options. The SAIJ family also features an upgraded piston seal for longer life.
The external stop screw allows you to trim the extend stroke by up to 50mm on-site. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X50-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X50-50 replacement — usually within 7-8 hours.