Key Takeaways

• Material selection is the single most important call you make when specifying pipe fittings. Brass, stainless steel, and Nyglass each have a service window where they outperform every other option, so matching the material to the fluid, pressure, and environment is non-negotiable.
• Brass pipe fittings remain the workhorse for water, gas, fuel, and pneumatic service, while stainless steel pipe fittings are the right call for corrosive, high-temperature, hygienic, and marine duty where carbon steel will not last.
• Nyglass fittings deliver outstanding chemical resistance, light weight, and electrical inertness, making them ideal for agricultural, wastewater, and chemical handling work where metal fittings would corrode or pose a galvanic risk.
• Always confirm thread standard, pressure rating, temperature limit, and chemical compatibility before placing an order. The Fox Global team can help you specify the right fittings the first time, with Australia-wide stock and delivery.

Every piping system is only as reliable as the fittings that hold it together. A poorly matched fitting is a leak waiting to happen, a maintenance ticket waiting to be raised, and in the worst case a safety risk that nobody on site needs. Get the fitting selection right, on the other hand, and the system runs cleaner, longer, and at lower lifecycle cost.

The challenge is that “pipe fittings” is a broad category. Material, type, thread standard, pressure class, and end configuration all need to be matched to the service conditions. This guide walks through the three pipe fitting materials Fox Global supplies most often into Australian industry, brass, stainless steel, and Nyglass, and shows you how to specify the right one for the job.

What Pipe Fittings Actually Do

Pipe fittings are the components that join, redirect, branch, terminate, or change the size of a pipeline. Elbows turn corners, tees split flow, reducers step up or down between sizes, unions allow the line to be broken for maintenance, and plugs or caps close off open ends. On a typical industrial site you will find dozens of fittings on every skid, every pump set, and every length of process pipework.

Two design choices shape almost every pipe fitting decision: the material the fitting is made from, and the type of connection it uses (threaded, push-fit, compression, flanged, or welded). For small to mid-bore lines under about 4 inch, threaded screwed fittings are the most common choice across Australian industrial, commercial, and rural systems. They install fast, do not need hot work permits, and can be broken down for maintenance without cutting the pipe.

That leaves material as the primary specification call. Get the material wrong and even a perfectly engineered fitting will fail prematurely. Get it right and you have a connection that will hold up for decades.

Brass Pipe Fittings: The Versatile All-Rounder

Brass pipe fittings are the most widely specified threaded fittings in general plumbing, gas, fuel, and pneumatic service across Australia. The reasons come down to a balanced set of properties: brass is naturally corrosion resistant, it machines cleanly to tight thread tolerances, it is easy to seal, and it sits at a far lower price point than stainless steel.

Brass is an alloy of copper and zinc. The exact ratio determines the working properties. Higher copper content (around 60 percent or more) gives stronger corrosion resistance and better suitability for potable water, while higher zinc content delivers harder, more machinable brass for general industrial fittings.

The malleability of the alloy is part of why brass performs so well as a fitting material: it threads cleanly to a tight tolerance, producing a leak-proof joint that holds up under pressure and vibration without galling. For potable water and aggressive water conditions, dezincification resistant (DZR) brass is the standard specification, since it adds a small percentage of arsenic, nickel, or silicon to suppress the loss of zinc that would otherwise leave the fitting porous and weak.

Brass pipe fittings are widely used across residential, commercial, and industrial applications, with typical service including cold and hot water reticulation, compressed air ring mains, instrument air, fuel and oil transfer, LPG and natural gas distribution, irrigation manifolds, and general pneumatic and hydraulic accessories.

Brass works comfortably from sub-zero conditions through to around 200 degrees Celsius, with pressure ratings on standard threaded brass typically running to 16 to 25 bar depending on size and configuration. In Australia, brass plumbing fittings used in potable water service typically conform to AS 3688, with BSPT and BSPP threads as the dominant standards.

Brass also plays well with the rest of the plumbing world. It is compatible with copper, PEX, and PVC pipework using the right adapters and inserts, which makes it a sensible choice for renovations, retrofits, and mixed-material installations where seamless integration into existing systems matters. Where space, alignment, or future disassembly rules out screwed fittings altogether, brass compression fittings are a practical alternative.

A compression fitting uses a nut, a compression ring (or olive), and a body to grip and seal a copper or plastic pipe without solder or threads, which is particularly useful on water service lines, instrumentation tie-ins, and tight retrofit work. Fox Global stocks brass fittings across all the common types: elbows, tees, sockets, unions, reducers, plugs, caps, and barrel nipples.

Where brass falls short is in highly corrosive media (concentrated acids, ammonia, and seawater above splash-zone exposure), in high-purity hygienic service, and in extreme temperature work. For those duties, stainless steel takes over. Brass is also a poor choice in any environment where dezincification has not been ruled out, which is why DZR-rated brass is the safer call wherever water chemistry is uncertain.

Stainless Steel Pipe Fittings: Built for the Tough Stuff

Stainless steel pipe fittings are the specification of choice when corrosion, contamination, hygiene, or extreme temperature are part of the picture. They are stronger than brass, far more chemically resistant, and they keep their structural integrity across a temperature range that no other common fitting material can match.

In Australia, stainless steel pipe fittings are most commonly supplied in two grades. Grade 304 contains around 18 percent chromium and 8 percent nickel and handles fresh water, mild chemical service, food contact, and general industrial environments without issue. Grade 316 adds 2 to 3 percent molybdenum, which dramatically improves resistance to chloride-induced pitting. Grade 316 is the standard for marine, coastal, food and beverage processing, brewing, dairy, pharmaceutical, and chemical handling work, anywhere salts, chlorides, or aggressive media are likely to come into contact with the line.

Threaded stainless steel fittings are typically supplied in three forged classes: 150 lb for general utility and lower-pressure industrial work, 3000 lb for process and hydraulic service, and 6000 lb for high-pressure steam and heavy industrial duty. Sizes commonly run from a quarter inch through to four inch BSP, covering everything from instrument tubing connections through to mid-bore process lines. Above four inch, screwed fittings give way to flanged or butt-welded connections, where gasket-style sealing performs better at large diameters.

The trade-off with stainless steel is upfront cost. A 316 elbow can land at several times the price of an equivalent brass fitting. In harsh service, however, that premium pays back many times over through longer life, fewer replacements, and the avoided cost of a contamination event or unplanned shutdown. For any application where failure carries a real consequence, stainless steel is rarely the wrong call.

Nyglass Fittings: Lightweight, Chemically Tough, Electrically Inert

Nyglass is a composite of nylon (polyamide) reinforced with glass fibres, typically in the range of 30 percent glass content by weight. The glass acts as a structural reinforcement, lifting the tensile strength, stiffness, dimensional stability, and heat resistance of the base nylon to levels that approach light metal alloys, while keeping the weight, chemical resistance, and corrosion immunity of an engineered plastic.

In our range, Nyglass fittings are most commonly seen as cam and groove (camlock) couplings used for hose-to-pipe connection in chemical, agricultural, and wastewater service. The material has three properties that set it apart.

• First, broad chemical resistance: Nyglass shrugs off most fertilisers, mild acids, alkalis, solvents, varnishes, and inks that would attack metal fittings.
• Second, low weight: a Nyglass fitting weighs a fraction of an equivalent brass or stainless fitting, which matters on portable hose runs, frequently moved equipment, and tower-mounted installations.
• Third, electrical inertness: Nyglass does not conduct, so there is no risk of galvanic corrosion when joined to dissimilar metals, and no spark hazard when struck or rubbed.

Typical applications include crop spraying and fertiliser handling, agricultural irrigation, chemical dosing, wastewater treatment, solvent and ink transfer in printing operations, and any low to medium pressure fluid transfer where corrosion or static is a concern. Nyglass is also resistant to UV weathering and salt spray, so it holds up well in outdoor and coastal installations where uncoated metal fittings would corrode quickly.

Two limits are worth keeping in mind. Nyglass is rated to a maximum continuous service temperature of around 79 degrees Celsius, so it is not the right choice for steam, high-temperature process lines, or hot water above warm potable temperatures. It is also not rated for compressed air or gas service, since a polymer-bodied coupling failing under air pressure can become a projectile. For air, gas, and high-temperature work, a metal fitting is the safer specification.

Matching the Material to Your Application

Choosing between brass, stainless steel, and Nyglass comes down to a small number of service questions. Run through these before placing an order and the right specification usually picks itself.

• What fluid is moving through the line? Potable water, hot water, gas, and fuels are classic brass territory, with DZR brass the safer call where water chemistry is aggressive. Salt water, chlorinated solutions, food, beverage, dairy, pharmaceutical, and most aggressive chemicals point to grade 316 stainless steel. Fertiliser, agricultural chemicals, mild acids, alkalis, solvents, and inks sit comfortably in Nyglass territory.
• What is the working temperature? If the line runs above 80 degrees Celsius, Nyglass is out. If it runs above 200 degrees Celsius or below minus 30 Celsius, brass is also out and stainless steel is the only practical metal option. For everything in between, all three materials are candidates.
• What pressure class do you need? Brass and stainless steel screwed fittings cover the vast majority of Australian industrial pressure classes, with 6000 lb stainless reaching well above the working pressure of any standard Nyglass coupling. For high-pressure systems and pulsating service, metal fittings are the only sensible choice.
• Is the environment outdoors, coastal, or corrosive? In coastal locations, the mining belt, and chemical plants, accelerated corrosion will eat plain brass and lower-grade carbon steel. Grade 316 stainless and Nyglass both hold up well in these conditions, so the choice between them comes back to temperature and pressure.
• Is there a galvanic or spark risk? Where the line is in contact with structural steel, equipment frames, or dissimilar metals in damp conditions, an electrically inert Nyglass fitting can break the galvanic circuit and prevent accelerated corrosion of the less noble metal. The same property removes any risk of sparking in flammable atmospheres, although for fuel and gas service, brass remains the more common spark-free metal option.

Sizes, Threads, and Pressure Ratings

Three specification details need to match across every fitting on the same line: thread standard, nominal size, and pressure rating. Mix any of these up and the joint either will not seal or will not hold.

Thread Standard

Australia uses BSP (British Standard Pipe) as the dominant thread form, governed by AS ISO 7-1 and BS 21. BSPP is parallel and seals against a washer or O-ring, while BSPT is tapered and seals on the threads themselves with the help of a sealant.

NPT (National Pipe Taper) is the American equivalent and is also tapered, but the angle and pitch differ from BSPT, so the two are not interchangeable. Forcing an NPT male into a BSP female (or the reverse) damages both parts and produces a joint that will leak under pressure. Fox Global supplies BSP as standard with NPT available on request for imported equipment.

Nominal Size

Sizes for screwed pipe fittings in Australia commonly run from one quarter inch BSP through to four inch BSP, which covers most instrument, utility, and process applications. Brass screwed fittings typically run from 6 mm (¼ inch) to 50 mm (2 inch). For Nyglass camlock-style fittings, sizes range from 15 mm (half inch) to 150 mm (six inch). Above four inch on threaded brass and stainless, flanged or butt-welded connections take over.

Pressure Rating

Threaded fittings carry a forged class rating that defines the working pressure envelope. Brass typically rates to 16 to 25 bar depending on size and configuration. Stainless steel screwed fittings come in 150 lb, 3000 lb, and 6000 lb forged classes, climbing into tens of MPa for the heavier classes at room temperature. Always read the pressure-temperature curve, since the rated pressure derates as the line temperature rises.

Source the Right Pipe Fittings from Fox Global

Fox Global is an established Australian importer, manufacturer, and distributor of industrial pipe fittings, valves, hose, flanges, and flow control products. The pipe fittings range covers brass screwed fittings (including DZR brass for potable water service), 304 and 316 stainless steel screwed fittings across all standard forged classes, and Nyglass camlock-style fittings for chemical, agricultural, and wastewater work. Stock is held across a full set of sizes, classes, and configurations, with same-day dispatch from Sydney and rapid freight to anywhere in Australia.

Every fitting Fox Global supplies comes from a manufacturer qualified for material traceability, dimensional accuracy, and thread quality. That means consistent performance from one batch to the next, and the certainty that what arrives on site matches the specification on the drawing. Where a project calls for material certificates, batch testing, or a specific compliance standard, the technical team can arrange it before the order ships.

If you are unsure whether brass, stainless steel, or Nyglass is the right pick for your application, the Fox Global team is happy to walk you through it. Tell us the fluid, the pressure, the temperature, and the environment, and we will help you specify the fittings the first time. Give us a call on 1300 852 795 to learn more about the full pipe fittings range, request a quote, or talk through a specification.

Pipe Fittings FAQs

What is the best thread sealant for brass and stainless steel pipe fittings?

For BSPT and NPT tapered threads, PTFE thread tape is the everyday choice for water, air, and low-pressure service, applied with two to three wraps in the direction of thread engagement. For higher-pressure, vibration-prone, or chemical work, an anaerobic liquid thread sealant is preferable, since it cures into the thread profile and resists back-off under cyclic loading.

On brass for fuel gas and LPG, choose a sealant rated for hydrocarbon service. Avoid hemp and traditional pipe dope on stainless threads or in food-grade and pharmaceutical lines, as they can introduce contamination. Always confirm sealant compatibility with the line media and temperature before installation.

Are pipe fittings recyclable at the end of their service life?

Brass and stainless steel pipe fittings are both fully recyclable as scrap metal. Brass holds significant resale value as a copper-zinc alloy and is widely accepted at metal recyclers across Australia. Stainless steel, particularly grade 316 with its molybdenum content, also commands a useful scrap price.

Nyglass is more difficult to recycle through standard kerbside streams, since the glass-reinforced thermoplastic needs specialist handling, but it can be processed through industrial plastics recyclers. Segregating fittings by material at decommissioning, rather than mixing them with general waste, recovers value and reduces landfill volume.

How should pipe fittings be stored before installation?

Store fittings in their original packaging, in a dry, indoor environment, off the floor and away from direct sunlight. Stainless steel fittings should be kept clear of carbon steel filings, grinding dust, and chloride sources (including some treated timbers and de-icing salts), since surface contamination can disrupt the chromium-rich passive layer and cause spotting.

Brass fittings should be kept dry, as long-term exposure to humid air promotes oxidation that, while cosmetic, can complicate threading. Nyglass should be kept out of direct UV exposure, since prolonged sunlight gradually degrades polymer surfaces. Caps and plugs left on threads from the factory protect the sealing surfaces and should stay in place until the fitting is ready to be installed.

Do pipe fittings need to be inspected once they are installed?

A new joint should be pressure-tested before being put into service, and ideally re-checked after the first thermal cycle, since metals expand, contract, and bed in slightly under their first run-up to operating temperature. After that, threaded joints in service should be visually checked for weeping, surface staining, and any sign of mechanical damage on a routine basis, with frequency dictated by the criticality of the service.

For hazardous, hot, or high-pressure lines, a structured inspection schedule (often three, six, or twelve monthly) is the safest approach. Any joint showing leakage, thread damage, or corrosion creep should be isolated, broken down, inspected, and either resealed or replaced before being returned to duty.

Can I match imported fittings to an existing Australian pipework system?

You can, but the thread standard needs to be confirmed before the parts go anywhere near the line. Most Australian piping is BSP, while imported equipment from North America is almost always NPT, and some European and Asian sources use metric or proprietary thread forms. Visually, BSP and NPT look similar, but the thread angle, taper, and pitch are different enough that forcing them together damages both parts.

The safest approach is to identify the existing thread with a thread gauge or with calipers and a known reference, then either order matching fittings or use a properly rated BSP-to-NPT adapter at the transition point. Fox Global stocks BSP as standard and can supply NPT and adapters on request, so the change-over can be done cleanly without risking a leak path.