This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X300-50, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAU replacement uses the same profile body, bore, stroke, force and SC-series mounting. It moves to the current CMSG / DMSG / EMSG sensor switches (the SU used CS1-B / DS1-B) and adds the SAUF valve-integrated option.
Airtac SUJ Adjustable Cylinder SUJ40X300-50
The AirTAC SUJ Adjustable Cylinder SUJ40X300-50 is a double-acting profile-type standard cylinder with a Ø40mm bore and 300mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X300-50, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X300-50
- 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 SUJ Adjustable Cylinder SUJ40X300-50
The AirTAC SUJ40X300-50 is a double-acting double-rod profile cylinder with an external stop screw that lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 250 to 300 mm stroke. The nominal 300 mm is the maximum. Bore 40 mm pushes 628 N and pulls 528 N at 0.5 MPa, with a 1/4 inch port and M12x1.25 rod thread. This SUJ is discontinued; the direct replacement is the SAUJ40X300-50, matching the bore, stroke, force, port and FA/LB mounting.
The SAUJ upgrade uses current CMSG/DMSG/EMSG sensors, whereas this legacy model used CS1-B/DS1-B. Because this specific SKU lacks a magnet, it cannot take a switch. The stop screw sets end position but is not a load lock; use an external rod lock for held loads.
Airtac SUJ Adjustable Cylinder SUJ40X300-50 Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X300-50 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X300-50 |
| Bore size | Ø40 mm |
| Stroke | 300 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| 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 standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SU datasheet (now discontinued). The SAUJ40X300-50 carries the same ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
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 | |
The SAUJ40X300-50 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SUJ Adjustable Cylinder SUJ40X300-50
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SU-family variants: SUD (double rod), SUJ (adjustable stroke) — each maps to its SAU equivalent (SUD→SAUD, SUJ→SAUJ). The current SAU line adds the SAUF valve-integrated option.
Where the Airtac SUJ Adjustable Cylinder SUJ40X300-50 Is Used
Variable Pitch Indexing
Trimming the extend stroke by up to 50 mm on-site allows a single 300 mm cylinder to drive multiple variable pitch indexing motions without swapping the whole actuator.
Adjustable Transfer Pusher
A transfer pusher can fine-tune its 250 to 300 mm reach on the floor to accommodate different package sizes arriving down the line.
Variable Depth Sealing
Packaging equipment can alter the extend end position to seal cartons of varying depths, using the stop screw to set the exact 250 to 300 mm depth.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X300-50 with the SAUJ40X300-50
To replace the discontinued SUJ40X300-50, order the direct replacement SAUJ40X300-50. If you need more force, the neighbouring 50 mm bore pushes 982 N at 0.5 MPa; if you need less, the 32 mm bore pushes 402 N. Choose the 50 mm adjust window if you need to trim the extend stroke on-site from 300 mm down to 250 mm. Mounting is basic, FA, or LB (SC series only). This non-magnetic SKU cannot take a switch; the SAUJ upgrade uses CMSG/DMSG/EMSG sensors instead of the old CS1-B/DS1-B. At 300 mm stroke, use external guides to prevent rod bending and side-load wear. The stop screw sets end position but is not a lock; add an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X300-50
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S): sensor family CS1-B → CMSG
- ✓ Mounting reused (FA/FB/CA/CB/LB)
- ✓ Need a built-in valve? → SAUF
Airtac SUJ Adjustable Cylinder SUJ40X300-50 FAQ
Yes, the SUJ40X300-50 is discontinued. The direct replacement is the SAUJ40X300-50, which matches the 40 mm bore, 300 mm stroke, 50 mm adjust window, 1/4 inch port and FA/LB mounting. The SAUJ uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B.
The external stop screw window is 50 mm, allowing you to trim the extend stroke from the 300 mm maximum down to 250 mm. The stop sets end position but is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X300-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X300-50 replacement — usually within 7-8 hours.