Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 750mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke750 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20S
The AirTAC SAIJ40X750-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits fine-tuning of the end position. It provides a usable travel window of 730 to 750 mm, letting you dial back the nominal 750 mm stroke by up to 20 mm without adding external stops. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between smaller 32 mm bores and heavier 50 mm assemblies.
This unit uses a SUS304 stainless steel rod for superior corrosion resistance and pairs with PT tapered ports. The extruded aluminum barrel includes sensor grooves on both sides, and because this is a magnet model, it directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for precise end-of-stroke detection. SAIJ uses a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on some standard lines.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 750 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / 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 | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×750 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20S Is Used
Machine Changeover
Dial in the 730-750 mm retract position during product size changes without disassembling the line or swapping cylinders.
Variable End-Stop Tuning
Use the rear 20 mm adjuster to fine-tune the exact end position during commissioning, absorbing mechanical tolerances easily.
Extended Travel Assembly
Leverage the 750 mm stroke for pushing or pulling loads across wide machine beds, guided externally to prevent side-load wear.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20S the Right Cylinder?
Choose this 40 mm bore when 402 N from a 32 mm bore is insufficient but a 50 mm bore delivering 982 N is physically oversized. The adjustable stroke is ideal for machine setup and product changeover, allowing you to reposition the retract stop during commissioning rather than swapping the entire cylinder for a fixed-stroke SAI variant. Remember that the rear adjuster acts only as a travel stop, not a lock; the cylinder cannot hold a load without live air pressure, so for fail-safe load holding you should consider an SAIL or BSAI series cylinder instead.
Because the 750 mm stroke is substantial relative to the 16 mm rod diameter, long unsupported travel invites side-loading. Even though the M12x1.25 rod thread is robust, you must use an external guide to prevent binding and premature seal wear over this extended travel distance.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw lets you shorten the effective stroke by up to 20 mm, providing a usable travel window of 730 to 750 mm. It functions as a mechanical stop to set the end position and does not lock the load without air pressure.
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.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.