Stopping Plugs

Product features

Majority of metric and NPT threads are available

Applicable for Zones 1/21 and 2/22

Allen key type

Thread sizes: metric M16 to M90 or NPT 3/8″” to 3

Atex Ex symbol

IECEx Ex symbol

IP68 Ex symbol

IP68 Ex symbol

IP66 Ex symbol

Technical Data

Dimensions: please see details below

Certification: ATEX, IECEx

ATEX marking:

Atex Ex symbolII 2 GD Ex db IIC Gb

Atex Ex symbolII 2 GD Ex eb IIC Gb

Atex Ex symbolII 2 GD tb IIIC Db

IECEx marking:
Ex db IIC Gb
Ex eb IIC Gb
Ex tb IIIC Db

Material: stainless steel 316L, brass

Ambient temperature: -55°C to +160°C

IP rating: IP66/IP68

Type of protection: Ex d, Ex e, Ex t

Thread types: metric, NPT


Send us your request to receive a quotation.

Specify the number and size of glands and accessories (switches, lights, etc.). The system will suggest the minimum dimensions of the box. You will also be able to download a quote for the entire set.


Stopping Plug
Stopping Plug

About Stopping Plug

HARDO stopping plugs are designed to blank off unused entries in hazardous area approved devices. It allows those devices to maintain their integrity and Ex ratings.

HARDO Stopping Plug

HPLG series of  stopping plugs can be used in Zones 1/21 and 2/22 and are made according to IEC standards. All HPLG series stopping plugs are ATEX and IECEx certified. They offer Ex e, Ex d, Ex t protection types as well as IP 66/68 rating. HARDO HPLG stopping plugs can be made of brass or stainless steel AISI 316L and are available with both metric and NPT threads sizes M16 to M90 and 3/8” and 3”.


Stopping Plug
Thread Size MetricThread Size NPTAllen Key SizeThread Lenght MetricThread Lenght NPTTightening Torque For MetricTightening Torque For NPT
M163/8”8131165 Nm90 Bm
M201/2”10131465 Nm90 Nm
M253/4”10131595 Nm90 Nm
M321”141318110 Nm113 Nm
M401.1/4”141519130 Nm113 Nm
M501.1/2”141519165 Nm113 Nm
M632”141520195 Nm181 Nm
M752.1/2”141530230 Nm181 Nm
M903”141531290 Nm181 Nm
HPLG0M=M160N=3/8”B = BRASS
1M=M201N=1/2”S = SS 316L