Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X300-30SH
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X300-30SH is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm bore and 300mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service. A variable air cushion at both ends lets you tune end-of-stroke deceleration on site.
- BoreØ40 mm
- Stroke300 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM12×1.25
- CushionVariable air cushion, both ends
- 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 MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X300-30SH
When a 300 mm travel has to stop short of full extension, the MACJ40X300-30SH lets you set the exact extend position within a 30 mm window - no spacers, no re-ordering. Output stays the same as any bore 40 MACJ: 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N at 0.7 MPa. Derate to about 377 N for continuous duty and the cylinder keeps margin in reserve.
Stainless tube, chrome-plated 16 mm rod, riveted aluminium covers: built for the damp corners of a plant where painted minis corrode. The standard piston magnet accepts CMSG, DMSG and EMSG reed switches for end-of-stroke signalling. Note the trailing H in the code is a special suffix - confirm from datasheet before ordering.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X300-30SH Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X300-30SH |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| 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 | Variable air cushion, both ends |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MA-series datasheet. Barrel: stainless-steel tube (round-body, riveted rolling-packed construction); piston rod: carbon steel with 20µm hard-chrome plating; covers: aluminium alloy. Thread options: PT (blank) / G / NPT. Every MA-series cylinder ships with a built-in magnet for CMSG / DMSG / EMSG position sensors.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 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 MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X300-30SH
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Stroke length in mm. |
| -30 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| -S | Built-in magnet for CMSG / DMSG / EMSG sensors (standard on MA series). |
| CA / U / CM | Back-cover type: CA pivot, U flat-end, CM round-end. |
MA-family variants: MA / MAC (double acting ±cushion), MSA / MTA (single acting push / pull), MAD / MACD (double rod ±cushion), MAJ / MACJ (adjustable stroke ±cushion), MAR (cushioned with integrated F/U mount). Mounting accessories: FA flange, LB foot, SDB pivot; plus I and Y knuckles. Thread PT (blank) / G / NPT.
Where the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X300-30SH Is Used
Seal bar press
Sets a heat-seal bar precisely inside the 30 mm window so film seals land at the same depth every cycle.
Bottling line stop gate
A gate that must retract fully but advance to a fixed point: the adjuster locks in the advance depth.
Screening hood raise
Lifts a ventilation hood on a mixing vessel; the cushion damps the hood as it seats at top of stroke.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X300-30SH the Right Cylinder?
Match the stroke window to your stop position: anything inside 30 mm of full extension can be set here, otherwise order a larger -NN window. Force-wise, bore 32 offers 402.2 N at 0.5 MPa for lighter work and bore 50 offers 981.3 N if you need more than 628.3 N. Remember the adjuster shortens the extend stroke only and does not hold a load when pressure drops - plumb a pilot check valve where that matters. FA and LB mounts fit; for the H suffix, confirm from datasheet.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) is standard for sensors
- ✓ Back cover (CA/U/CM) & mount (FA/LB/SDB)
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 Do not dismantle the riveted front/back covers.
- check On first run, back off the cushion screws and release gradually.
- check Installation by qualified personnel per AirTAC docs.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X300-30SH FAQ
Double-acting output: 628.3 N push and 527.8 N pull at 0.5 MPa, climbing to 879.6 N push and 738.9 N pull at 0.7 MPa; 128.1 kgf is the theoretical maximum at 1.0 MPa. Bore 40 mm, 16 mm rod, 1/8" port, rod thread M12x1.25. Operating pressure 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-800 mm/s.
Yes - every MACJ ships with the piston magnet already installed as a standard feature, so CMSG, DMSG and EMSG reed switches mount directly onto the barrel and signal rod position with no special-order piston. Keep in mind the adjuster is an extend-stroke end stop only; it will not lock the rod against drift if air is lost.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC MACJ Cylinders
Request a Quote for Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X300-30SH
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.