This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X50-20LB, 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 SIJ125X50-20LB
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X50-20LB 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 SAIJ125X50-20LB, 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 → SAIJ125X50-20LB
- 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 SIJ125X50-20LB
The AirTAC SIJ125X50-20LB is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 20mm on-site, giving a usable 30-50mm window from the 50mm nominal maximum. The direct replacement is the SAIJ125X50-20LB, matching the LB mounting interface, force, and cushioning.
The SAIJ upgrade introduces an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. This SKU lacks a magnet (-S), so it cannot accept legacy CS1-B/DS1-B sensors. Note that the external stop sets the end position but is not a load lock; for held loads use SAIL, BSAI, or an external rod lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-20LB Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-20LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X50-20LB |
| 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 SAIJ125X50-20LB 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 SAIJ125X50-20LB 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 SIJ125X50-20LB
| 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 SIJ125X50-20LB Is Used
Press Fit Tuning
Dialing in a 30-50mm insertion stroke for large bearings, allowing operators to trim the extend on-site without swapping cylinders.
Divertor Gate Adjustment
Fine-tuning the actuation reach of a heavy diverter arm across mixed product sizes using the 20mm external stop screw window.
Pallet Stop Positioning
Setting an exact end-stop for 125mm bore pallet routing gates where fixed stroke cylinders lack the required field flexibility.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-20LB with the SAIJ125X50-20LB
To replace the discontinued SIJ125X50-20LB, order the exact direct replacement SAIJ125X20LB, which preserves the ISO 15552 dimensions, LB mounting, G1/2 port, and 20mm adjust window. Choose the 20mm adjust window when you need precise 30-50mm extend tuning. Because this SKU has no -S magnet, magnetic sensing is impossible. The 40mm adjustable air cushions decelerate the load near stroke end, but do not brake or hold position on air loss; for load-holding select a SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X50-20LB
- ✓ 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 SIJ125X50-20LB FAQ
Yes, the SIJ125X50-20LB is discontinued. The direct replacement is the SAIJ125X50-20LB, which matches the ISO 15552 interface, 125mm bore, 50mm nominal stroke, 20mm adjust window, G1/2 port, and LB mounting. The SAIJ family also uses an upgraded two-piece Y-shaped piston seal.
The external stop screw provides a 20mm adjust window, allowing the extend stroke to be shortened from the 50mm maximum down to 30mm. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X50-20LB
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X50-20LB replacement — usually within 7-8 hours.