ASA Hydraulik ASA Series Cooler Connector - Sold Individually, Two Required per Cooler, BSPP or UNO

These are the universal connectors for the large ASA Series axial oil coolers, and they are sold one at a time. A single cooler needs two of them, one for the inlet and one for the outlet, so order quantity 2 per cooler. Getting that wrong is the most common ordering mistake on this part, and a cooler with one connector cannot be plumbed. Pick your port size below, set the quantity to 2, and it is on its way.

Ways to buy:

• Off the shelf - 1-1/4 inch and 1-1/2 inch BSPP, plus 1-5/8 inch and 1-7/8 inch UNO, and a 1/2 inch port sandwich plate.
• Quantity 2 is what one cooler needs. These are individual connectors, not a pair and not a kit. One cooler, two connectors. Two coolers, four connectors.
• Need a gauge or sensor port? ILLZASA40-40G12 is a 1/2 inch port sandwich plate, not a connector. It fits between the cooler and the connector and gives you a tapping for a pressure gauge or a temperature sensor.
• Different cooler family? TT Rail coolers use a different arrangement, supplied as one complete kit of two fittings per cooler. Use the TT Rail connector kit listing for those.
• Add the extras - temperature switches, fan controllers and replacement fan kits are all listed separately.
• Not listed? Call us and we will factory-code it. The ASA connector range runs to other thread forms and frame sizes beyond the five held here.

Pick your model

NG 32 and NG 40 are the ASA frame sizes. Match the frame size of the connector to the connector face on your cooler, then choose the port thread you want to plumb into.

What is in the box

• One connector. Not a pair. Quantity 1 in the cart is one connector.
• Two are required per cooler, one on the inlet and one on the outlet. Set the quantity to 2 for a single cooler.
• On ILLZASA40-40G12: one 1/2 inch port sandwich plate. This is an intermediate plate, not a connector, and it does not replace either of the two connectors the cooler needs.
• NOT included - the cooler. This listing is the connector only.
• NOT included: hose tails, adaptors, hose, gauges, sensors, or brackets to carry the hose weight.

Specifications

How to choose

• First, order two. Whatever size you land on, a single cooler takes two connectors. This is the one thing worth double checking before you hit buy.
• Match the frame size to your cooler. NG 32 and NG 40 connector faces are different. Check which face your ASA Series cooler has before you pick a port thread.
• BSPP or UNO is decided by your existing fittings. If the machine is plumbed in BSPP, stay in BSPP. If it is on straight thread O-ring boss fittings, take the UNO. Do not mix and adapt if you can avoid it, every adaptor is another joint to leak.
• Size the port to the return line, not to the hose you have on the shelf. Necking a big cooler down to a small port lifts back pressure across the core for no gain.
• Add the sandwich plate if you want to measure anything. One 1/2 inch port between cooler and connector is the tidiest place to put a temperature sensor or a gauge, and it is far better than cutting into a hose later. It is an extra, not one of the two connectors.

Technicians Advice

Two things sink these joints.

The first is PTFE tape on a BSPP connector. BSPP is a parallel thread that seals on the face, on an O-ring, and tape does nothing there except stop the connector seating square and shed shreds into your return line.

Fit it dry, check the O-ring is clean and evenly seated in its groove, wipe a little clean system oil on it so it does not roll as the joint closes, and pull the fasteners down progressively side to side rather than torquing one corner home first. These are aluminium castings, so firm and even beats hard: over-torque distorts the sealing face and once that face is not flat the O-ring cannot save it.

The second is weight. These are big coolers on big hose, and a 1-1/2 inch line full of oil is heavy. If the connector thread is carrying that weight, plus the whip of a machine working, the joint will eventually weep or the boss will crack. Clamp the hose within about 300mm of the connector so the run is supported before it reaches the cooler, and leave a slack loop so thermal movement and vibration are absorbed by the hose rather than the port.

While you are there, think about the air. An ASA Series cooler needs a clear path on both faces, not just the front, and the depth of clear space behind the fan matters as much as in front of the core.

Box one into a cabinet or push it up against a wall and the fan simply recirculates its own hot discharge, the air-on temperature climbs, and the cooler quietly stops working while everything looks correctly installed. Re-check both connectors after the first heat cycle, and if you fitted the sandwich plate remember it adds another joint face to check as well.

Official Datasheets

📄 ASA Series Connectors (PDF)

Complete your setup

Remember: two connectors per cooler. One for the inlet, one for the outlet.

TT Rail Connector KitsTemperature SwitchesFan Temperature ControllersReplacement Fan Kits

Need help choosing? Call 1300 146 737 or email sales@mhfgc.com.au - real technicians, real answers.