The Stahlpanzerrohrgewinde standard for screw thread

Screw thread

A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread...

s, more often called by the shorter name Panzergewinde (pronunciation), is a technical standard created in Germany and subsequently used in various countries, such as the German-speaking zone (Germany, Switzerland, Austria) and neighboring European countries. The German name "Stahlpanzerrohrgewinde" translates to English as 'steel conduit thread'. The thread is used to join pieces of electrical conduit

Electrical conduit

An electrical conduit is an electrical piping system used for protection and routing of electrical wiring. Electrical conduit may be made of metal, plastic, fiber, or fired clay. Flexible conduit is available for special purposes....

 and cable gland

Cable gland

A cable gland is a device designed to attach and secure the end of a cable to the equipment...

s.

Alternate stylings of the German name are Stahl-Panzer-Rohr-Gewinde and an abbreviated form, StaPa-Rohr-Gewinde.

The standard, codified by the Deutsches Institut für Normung

Deutsches Institut für Normung

is the German national organization for standardization and is that country's ISO member body. DIN is a Registered German Association headquartered in Berlin...

(DIN, German Institute for Standardization), is DIN 40430. Panzergewinde sizes are named with the prefix PG plus a nominal number which approximately corresponds to the maximum cable diameter (in millimeters) that can be passed through the conduit.

Because the walls of the conduit are usually relatively thin, the thread depth should not be very large. Thus a thread angle

Thread angle

The thread angle of a screw is the angle between the threads. This is a defining factor for the shape of a screw thread. Standard values include:...

 of 80° is used. The Verband der Elektrotechnik, Elektronik und Informationstechnik

Verband der Elektrotechnik, Elektronik und Informationstechnik

The VDE Association for Electrical, Electronic and Information Technologies e.V. is one of Europe’s largest technical-scientific associations with 35,000 members, including 1,300 corporate and institutional members and 8,000 students.- Organization :...

(VDE) (which began as a trade association

Trade association

A trade association, also known as an industry trade group, business association or sector association, is an organization founded and funded by businesses that operate in a specific industry...

 for standardization in electrical engineering) originally standardized (and named) the thread for use with conduit and cable glands that were made of steel

Steel

Steel is an alloy that consists mostly of iron and has a carbon content between 0.2% and 2.1% by weight, depending on the grade. Carbon is the most common alloying material for iron, but various other alloying elements are used, such as manganese, chromium, vanadium, and tungsten...

, although today the thread is used with both steel (typically plated

Plating

Plating is a surface covering in which a metal is deposited on a conductive surface. Plating has been done for hundreds of years, but it is also critical for modern technology...

 with combinations of nickel, zinc, or tin to resist rusting) and polyvinyl chloride

Polyvinyl chloride

Polyvinyl chloride, commonly abbreviated PVC, is a thermoplastic polymer. It is a vinyl polymer constructed of repeating vinyl groups having one hydrogen replaced by chloride. Polyvinyl chloride is the third most widely produced plastic, after polyethylene and polypropylene. PVC is widely used in...

 (PVC).

Beginning in 2000, the VDE standard for cable glands (VDE 0619) was formally replaced by EN 50262. After a transitional period of several years during which it could still be used, it was replaced in 2003 by a final metric fine thread with 1.5 mm pitch. Similary, conduit threads were replaced by EN 60423.

Even today, Panzergewinde cable glands are still often found on chemical reactor

Chemical reactor

In chemical engineering, chemical reactors are vessels designed to contain chemical reactions. The design of a chemical reactor deals with multiple aspects of chemical engineering. Chemical engineers design reactors to maximize net present value for the given reaction...

s and bioreactor

Bioreactor

A bioreactor may refer to any manufactured or engineered device or system that supports a biologically active environment. In one case, a bioreactor is a vessel in which a chemical process is carried out which involves organisms or biochemically active substances derived from such organisms. This...

s (for example, PG13.5 thread for screwing in sensors) and various other equipment, enclosures, junction box

Junction box

An electrical junction box is a container for electrical connections, usually intended to conceal them from sight and meter tampering. A small metal or plastic junction box may form part of an electrical conduit wiring system in a building, or may be buried in the plaster of a wall, concealed...

es, and connectors

Electrical connector

An electrical connector is an electro-mechanical device for joining electrical circuits as an interface using a mechanical assembly. The connection may be temporary, as for portable equipment, require a tool for assembly and removal, or serve as a permanent electrical joint between two wires or...

.

Sizes

Thread nominal size	Outer diameter [mm (in)]	Threads per inch (TPI)	Pitch [in (mm)]	Inner diameter [mm (in)]	Cable diameter [mm (in)]
PG7	12.5 (0.492125984251969 in)	20	0.05 (1.27 mm)	11.28 (0.444094488188976 in)	3 to 6.5 mm (0.118110236220472 to 0.255905511811024 in)
PG9	15.5 (0.610236220472441 in)	18	0.05556 (1.4112 mm)	13.86 (0.545669291338583 in)	4 to 8 mm (0.15748031496063 to 0.31496062992126 in)
PG11	18.6 (0.732283464566929 in)	18	0.05556 (1.4112 mm)	17.26 (0.679527559055118 in)	5 to 10 mm (0.196850393700787 to 0.393700787401575 in)
PG13.5	20.4 (0.803149606299213 in)	18	0.05556 (1.4112 mm)	19.06 (0.750393700787402 in)	6 to 12 mm (0.236220472440945 to 0.47244094488189 in)
PG16	22.5 (0.885826771653543 in)	18	0.05556 (1.4112 mm)	21.16 (0.833070866141732 in)	10 to 14 mm (0.393700787401575 to 0.551181102362205 in)
PG21	28.3 (1.114 in)	16	0.0625 (1.5875 mm)	26.78 (1.054 in)	13 to 18 mm (0.511811023622047 to 0.708661417322835 in)
PG29	37 (1.457 in)	16	0.0625 (1.5875 mm)	35.48 (1.397 in)	18 to 25 mm (0.708661417322835 to 0.984251968503937 in)
PG36	47 (1.85 in)	16	0.0625 (1.5875 mm)	45.48 (1.791 in)
PG42	54 (2.126 in)	16	0.0625 (1.5875 mm)	52.48 (2.066 in)
PG48	59.3 (2.335 in)	16	0.0625 (1.5875 mm)	57.78 (2.275 in)

Pronunciation

• Stahlpanzerrohrgewinde: SHTAHL-pahntser-rōr-guh-vĭn-duh
• Panzergewinde: PAHNTSER-guh-vĭn-duh
• PG: peh-geh