Hazardous Area Ex Fittings

Hazardous Area Ex Fittings: Brass Reducers & Enlargers for Explosive Atmosphere Installations

Hazardous area ex fittings solve a problem that comes up constantly on classified sites — the cable gland thread size on hand doesn't match the entry on the junction box or enclosure. This range covers nickel-plated brass reducers and enlargers built for that exact gap, including bimetal M12 to M20 enlargers for multi-step conversions, giving electricians, instrumentation techs and cablers a way to fit non-matching gland and entry sizes on Ex-rated equipment without compromising the seal.

What's in This Range

• Brass Enlargers — nickel-plated, single-step conversion for stepping up gland entry size on hazardous area enclosures.
• Brass Reducers — metric thread reducers across common gland sizes for downsizing existing entries.
• Ex db IIC Gb Rated Reducers — bimetal two-step reducers carrying explicit Ex d certification for demanding classified zones.
• NPT to Metric Reducer Adaptor — converts male NPT thread to female metric, useful where imported or legacy equipment doesn't match local gland standards.

Who Uses This

These fittings turn up on switchboard and junction box upgrades at fuel depots, grain handling facilities and mining sites, where classified-zone enclosures rarely arrive with the exact gland size an electrician is stocking on the van. Instrumentation techs use the smaller reducers to fit sensor cabling into existing Ex e terminal boxes, while enlargers and two-step bimetal reducers get used on chemical processing and offshore installations where entry sizes vary between equipment brands.

Hazardous Area Ex Fittings — Common Questions

Do I need a single-step reducer or a two-step bimetal reducer?

A single-step reducer works if you're only jumping one thread size, such as M25 down to M20. For a bigger gap — for example stepping down from M75 to M63 — a bimetal two-step reducer distributes the size change across two threads, which keeps the seal more reliable than forcing a single-step reducer beyond its rated range.

Will these fittings maintain IP66/68 sealing on outdoor or washdown equipment?

Yes, provided the seal washer is intact and correctly seated — brass reducers and enlargers only maintain their rating if the compatible seal is in good condition. If a seal has perished or gone missing, a compatible spare seal restores the sealing performance without replacing the whole fitting.

Are these fittings certified for use on Ex d and Ex e rated equipment?

Some fittings in this range carry explicit Ex d IIC Gb certification, which is the level required for flameproof enclosures in zones 1 and 2 under AS/NZS 60079. Always check the specific certification marked on the fitting against your enclosure's own Ex rating before installing, since not every reducer or enlarger in the range carries the same certification level.

Why Choose SCHNAP

• Nickel-plated brass Alco fittings covering a wide thread range, from M12 through to M75, for matching most gland-to-enclosure combinations.
• Ex db IIC Gb certified reducers available for zone 1 and 2 flameproof enclosure work, alongside standard IP66/68 rated options.
• 30-day return policy and Australia-wide delivery on the full hazardous area fittings range, with trade discounts for account holders.

Not sure which reducer size fits your existing gland? Our cable gland reducer sizing guide walks through matching thread sizes step by step — browse the range above or get in touch with our trade team for help selecting the right fitting.