Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40S
The AirTAC SAIJ40X300-40-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, letting you dial back the 300 mm nominal travel by up to 40 mm. This creates a 260-300 mm usable end-position window, ideal for fine-tuning machine setup or product changeover without swapping the hardware. It delivers 879 N of push force at 0.7 MPa and pulls with 528 N at 0.5 MPa.
Built with a SUS304 stainless steel rod (code B) for corrosion resistance, this unit includes a magnet for position sensing. You can mount CMSE reed or DMSE solid-state switches directly into the dual-side sensor grooves. The 16 mm rod and M12x1.25 thread handle side loads well, but at 300 mm of travel you should still use an external guide to prevent rod binding. The rear adjuster acts purely as a travel stop and does not hold the load without live air.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAIJ40BX300-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SAIJ40BX300-40S Is Used
Product Changeover Tuning
Quickly fine-tune the 260-300 mm travel end-position when switching product sizes on a packaging line, avoiding the need to physically swap cylinders.
Machining Fixture Stop
Acts as a precise external stop for workholding fixtures, using the rear adjuster to set exact material feed distances without adding bulky external stopper blocks.
Diverting Gate Adjustment
Sets variable diverting distances on conveyor systems, allowing operators to dial in the exact 260-300 mm gate extension required for different package widths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (offering 563 N push at 0.7 MPa) is too weak, but a 63 mm bore (2182 N push at 0.7 MPa) is oversized. The adjustable 260-300 mm window is selected over a fixed-stroke SAI cylinder when you need variable end-stops during commissioning. For load-holding without continuous air pressure, this plain cylinder is insufficient; instead, look to the SAIL air-released lock or BSAI clamp-lock series.
This SAIJ40X300-40-S is dimensionally interchangeable per ISO 15552. It uses PT tapered ports, a 30-800 mm/s speed range, and a reduced mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ40BX300-40S FAQ
This 40 mm bore cylinder provides 628 N of push force and 528 N of pull force at 0.5 MPa. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw lets you shorten the effective stroke by up to 40 mm from the 300 mm nominal length, creating a 260-300 mm usable travel window. It functions as a mechanical stop and does not lock the load without live 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 SAIJ40BX300-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.