Exd Exe Unions| Hazardous Area | Flameproof & Increased Safety Unions
Electrical Thread Conversions & Cable Installation Solutions for Hazardous Areas & Explosion Proof/Protection Applications
Exe Exd unions
Flameproof & Increased Safety Unions

Adaptors | Flameproof & Increased Safety
Raxton Exd/Exe hazardous area unions provide a running joint whilst eliminating exposed threads and are particularly suitable for use where a coupler would be impractical – adaptors are ATEX Certified.
Standard Exe Exd unions, manufactured by Raxton, are available in a variety of thread forms and are available with male to female or female to female thread entries. The female connection thread of the union shall step not more than one size up from the male connection thread, or equal to one size up in the case of a thread gender change. Eg M20(M) to M25(F) or M20(M) to 3/4 NPT(F).
Raxton flameproof (Exd) and increased safety (Ex e) unions are marked with the applicable approval number and size.
Materials
- Brass: BS2874: 1985 CZ121
- Mild Steel: BS970 PT3 230M07
- Stainless Steel: BS970 PT3 316 S11
- Aluminium Bronze: BS1400 1985 AB2 or BS2874:1986 CA104
Raxton Exe & Exd unions are available in a variety of finishes including Nickel, Electro Zinc, Zinc Passivated, Chromatised, Electroless Nickel and Anodised.
Exd exe union dimensions
The ATEX Certified unions are suitable for both Zone 1 & Zone 2 hazardous area installations.
Thread | Protrusion (mm) | Bore (mm) | Dia. (mm) |
M16 | 45.0 | 11.0 | 30.0 |
M20 | 45.0 | 14.3 | 42.0 |
M25 | 45.0 | 20.5 | 47.0 |
M32 | 45.0 | 26.8 | 54.0 |
M40 | 45.0 | 33.5 | 62.0 |
M50 | 45.0 | 44.0 | 77.0 |
M63 | 45.0 | 55.2 | 87.0 |
M75 | 45.0 | 66.7 | 102.0 |
Hazardous Areas
The hazardous area unions are certified and approved to the following international hazardous area classifications and are Flameproof & Increased Safety Standards.
Approvals & Certifications: Sira 10ATEX1225X | IECEx SIR 12.0014X | GOST TС С-GB.ГБ06.В00105 | INMETRO NCC 12.0764X
union Thread selection
- Isometric (ISO) to BS3643:1981 and ISO 965 Pts 1 & 3
- Imperial (ET) to BS31:1940 (1979)
- National Pipe Thread (NPT) to ANSI/ASME:1983
- British Standard Pipe (BSP) to BS21:1985
- Pg to DIN 40430:1971
These union selection tables identify the standard thread variations produced and are designed to assist the user in selecting the correct hazardous area Exe/Exd union suitable for use in Zone 1 or Zone 2 potentially explosive atmospheres according to the ATEX Directive.Â
Isometric to BS 3643:1981
Adaptor Size | Major Diameter (mm) | Threads per Inch | Pitch |
16mm (M16) | 16 | 16.93 | 1.50 |
20mm (M20) | 20 | 16.93 | 1.50 |
25mm (M25) | 25 | 16.93 | 1.50 |
32mm (M32) | 32 | 16.93 | 1.50 |
40mm (M40) | 40 | 16.93 | 1.50 |
50mm (M50) | 50 | 16.93 | 1.50 |
63mm (M63) | 63 | 16.93 | 1.50 |
75mm (M75) | 75 | 16.93 | 1.50 |
National Pipe Thread to ANSI/ASME: 1983
Adaptor Size | Major Diameter (mm) | Threads per Inch | Pitch |
1/8″ NPT | 10.30 | 27 | 0.94 |
1/4″ NPT | 13.72 | 18 | 1.41 |
3/8″ NPT | 17.15 | 18 | 1.41 |
1/2″ NPT | 21.34 | 14 | 1.81 |
3/4″ NPT | 26.67 | 14 | 1.81 |
1″ NPT | 33.40 | 11 1/2 | 2.20 |
1 1/4″ NPT | 42.16 | 11 1/2 | 2.20 |
1 1/2″ NPT | 48.26 | 11 1/2 | 2.20 |
2″ NPT | 60.33 | 11 1/2 | 2.20 |
2 1/2″ NPT | 73.03 | 8 | 3.175 |
3″ NPT | 88.90 | 8 | 3.175 |
4″ NPT | 114.30 | 8 | 3.175 |
British Standard Pipe to BS 21:1985
Adaptor Size | Major Diameter (mm) | Threads per Inch | Pitch |
1/8″ BSP | 9.73 | 28 | 0.91 |
1/4″ BSP | 13.16 | 19 | 1.34 |
3/8″ BSP | 16.66 | 19 | 1.34 |
1/2″ BSP | 20.96 | 14 | 1.81 |
3/4″ BSP | 26.44 | 14 | 1.81 |
1″ BSP | 33.25 | 11 | 2.31 |
1 1/4″ BSP | 41.91 | 11 | 2.31 |
1 1/2″ BSP | 47.80 | 11 | 2.31 |
2″ BSP | 59.61 | 11 | 2.31 |
2 1/2″ BSP | 75.18 | 11 | 2.31 |
3″ BSP | 87.88 | 11 | 2.31 |
4″ BSP | 113.03 | 11 | 2.31 |
Adaptors, Reducers, Stopping Plugs & Breather Drains
For further information about the complete range of Raxton electrical thread conversion and flameproof/increased safety products for use with cables and ATEX electrical enclosures installed in potentially explosive atmospheres or hazardous area locations please refer to the information below:
Exd/Exe Reducers | Exd/Exe Male to Male & Female to Female Adaptors | Exd/Exe Right Angle Adaptors |
Exd/Exe Swivel Adaptors | Exd/Exe Y and T Adaptors | Exd/Exe Stopping Plugs |
Exd/Exe Breather Drains | Exd/Exe Compound Stopper Box | Exd/Exe Unions |
➡ View all Exd Exe Adaptors, Reducers, Stopping Plugs & Breather Drain Plugs | ATEX Hazardous Area

Exd Exe Adaptors, Reducers, Stopping Plugs & Breather Drain Plugs | ATEX Hazardous Area
THORNE & DERRICK
Thorne & Derrick are Specialist Distributors of Hazardous Area & Explosion Proof Equipment with IECEx & ATEX Certifications to the onshore and offshore oil, gas, petrochemicals and process industries.
We supply major UK and international infrastructure projects and also MRO (Maintenance, Repair, Operations) requirements for both planned and unplanned plant shutdowns – we react with a rapid response to customer demand to ensure downtime is minimised and reliable Power, Light & Heat is restored or provided.
Key Product Categories: Control Panels | Plugs & Sockets | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace Cables & Systems | Gas Detection & Detectors | Fire Detection & Detectors | Heat Detectors | Electrical Heating & HeatersÂ
➡ Also Process Instrumentation Products: Ashcroft Pressure Gauges | ASCO Valves | Katronic Flow Meters | KROHNE Flow Meters | VEGA Level Sensors | Rotronic Temperature & Humidity Sensors | SIKA Pressure Gauges