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Exd Flameproof / Exe Increased Safety Adaptors and Reducers (AD-U/RD-U Series)

Brass ADU  RDU






Redapt AD-U and RD-U Series of Adaptors and Reducers provide a method of matching electrical threadforms on hazardous area approved equipment whilst ensuring the integrity and Ex approval of the installation is maintained.

Manufactured from hexagon material to facilitate easy installation, they are also supplied complete with a captive O-ring seal. The O-ring is located within a recess on the face of the product, helping to protect the O-ring from environmental damage and ensuring it is not displaced during installation.

Adaptors are used where the thread size of the cable gland or connection device is larger than, or of an equivalent size, to the entry thread of the enclosure.

Reducers are used where the thread size of the cable gland or entry device is smaller than the entry thread of the enclosure.

Redapt Adaptors & Reducers are designed for hazardous area applications and are certified to protection concepts Exd “Flameproof” and Exe “Increased Safety” for use in Zone 1 and Zone 2 applications.

Approved to the latest international standards, adaptors and reducers can be supplied with ATEX, IECEx, and GOST-R hazardous area certificates.

In addition CSA approval certificates can be supplied to cover use in North American and Canadian Class I Division 1 and Class I Zone 1 applications.

Metallic adaptors and reducers are also available as an Exe Increased Safety round bodied product - the AO-E Series (adaptors) and RO-E Series (reducers).

Technical Data Table

Protection Method
Exd – Flameproof / Exe – Increased Safety
Ingress Protection (IP) Maintained IP66 / IP67 / IP68 to a depth of 2 metres
Impact Resistance
20 Nm (7Nm for aluminium products)

-50°C to 180°C (no O-ring)

(actual temperature dependent on O-ring used)


Base Materials

O-ring Materials



Brass, 316 stainless Steel, aluminium, mild steel

Nitrile, silicone, viton, EPDM, neoprene, others on application

Nickel, zinc, others on application 

Metric, NPT, PG, ISO Pipe (BSP), ET, others on application
Standards Approved To
IEC 60079-0, IEC 60079-1, IEC 60079-7, IEC 61241-0, IEC 61241-1

Ex Approvals 

ATEX Approval


IECEx Approval


GOST-R Approval


CSA Approval (North America)



IECEx SIR 12.0016X

TC RU С-GB.ГБ06.В00106 – Russian
TC RU С-GB.ГБ06.В00106 – English
TC RU С-GB.ГБ06.В00106 Annex Document - English

1248014 (LR 106084)

Other Approvals

CCOE Approval (India) 


CCOE (India) Letter

Installation Instructions


Product Datasheet

Metallic Adaptors and Reducers

Adaptor and Reducer Selection Guide  

How To Order

Part Number System