DIN 431 Low Pipe Nut

DIN 431 is the standard governing the manufacture of pipe nuts with inch rather than metric thread. A distinguishing feature of this type of fastener is its reduced height, which allows installation in confined spaces where the dimensions of the threaded connection must be minimized.

These nuts are in demand across various branches of industry and construction, and are used for installation work on a wide range of sites. The hexagonal parts are designed to be tightened by hand or with a nut driver.

Manufacturing features

In accordance with the standard, pipe nuts are made from carbon steel grade 14H. They can additionally be given a zinc coating — galvanizing extends service life by resisting corrosion. Nuts made of stainless steel A2 and A4 are also available: these alloys resist corrosion thanks to the alloying elements in their composition. Pipe nuts made of brass and other non-ferrous alloys are also used in industry.

The reduced height of these nuts results in fewer thread turns, which lowers strength, so this type of fastener is not used in assembling critical, high-load connections. Thanks to its reduced dimensions, it is used where nuts of standard size cannot be installed.

Technical specifications of the fasteners

In accordance with the European standard DIN 431, the nuts are manufactured with the following parameters:

• The height of the part can range from 8 to 13 mm, selected according to size.
• The nominal diameter of the nut’s inch thread bore can vary from G1/8” to G2”.
• The size of the part allows the use of wrenches ranging from 18 to 75 mm for installation.

The wide size range makes it possible to select fasteners with the required parameters for various tasks. The FLOK catalogue features nuts of all sizes.

Applications

Pipe nuts manufactured using cold forging technology are used in various branches of industry. They are most in demand in mechanical engineering: the automotive industry, instrument making, machine-tool building, and the production of various equipment. They are also used in construction for assembling metal frameworks and other tasks.

FLOK supplies fasteners in wholesale lots: review the range and order the required quantity of fasteners and hardware. Consultations are available to help select alternatives for the optimal solution.

Dimensions of DIN 431 pipe nuts with inch thread

d	m	s
G 1/8”	6	18
G 1/4”	6	21
G 3/8”	7	27
G 1/2”	8	32
G 5/8”	8	34
G 3/4”	9	36
G 1”	10	46
G 1 1/4”	11	55
G 1 1/2”	12	60
G 1 3/4”	13	70
G 2”	13	75

Designations:

d - nominal thread diameter, inch

m - nut height, min, mm

s - nut width across flats, max, mm