DIN 557 Square Nut with Chamfer, Steel

The DIN 557 standard covers the manufacture of square nuts with a chamfer. This is a special fastener designed for use in threaded connections subject to dynamic loads and strong vibration.

The square shape of the nut allows it to be easily installed in a pre-prepared rectangular slot of the corresponding size, and the chamfer simplifies installation. The nut is used together with a bolt or screw: when tightened with a wrench, it forms a strong connection protected against self-loosening.

Materials

Square nuts to the DIN 557 standard are produced from various materials:

• The most common variant is nuts made of carbon steel, property class 5. The metal is given a zinc coating: a thin layer of zinc is applied by hot-dip galvanizing or electrogalvanizing. The protective coating prevents premature deterioration of the metal upon contact with the external environment.
• Stainless steel. Stainless steel nuts are used under conditions of constant corrosive exposure and last a long time thanks to protection against destructive factors.

The products comply with product grade C. Despite their non-standard shape, they are convenient to use and quickly installed into prepared slots.

Technical specifications of the product

Square nuts for slot installation and reliable connection fixation have the following characteristics:

• Thread diameter of the hole — from M5 to M16.
• Chamfer diameter — from 6.7 to 22 mm.
• Overall height of the fastener — from 4 to 13 mm.
• Width across flats of the nut — from 8 to 24 mm.
• Thread pitch — from 0.8 to 2 mm.

Nuts are selected by parameters according to the task at hand. The closest analogue is manufactured to the DIN 562 standard, however such nuts have a reduced height compared to the DIN 557 standard.

Application possibilities of the products

Fasteners of this type are widely used in industry: in heavy machine building, automotive manufacturing, machine tool production, and the assembly of various equipment. They are used for assembling units and assemblies constantly subject to dynamic loads: installing a square-shaped nut in a slot prevents self-loosening. Products of this type increase connection reliability and are quickly installed. They are also used in construction and installation work.

FLOK supplies DIN 557 square nuts and their closest analogues in wholesale lots. The product complies with manufacturing standards.

Dimensions of DIN 557 square nuts with chamfer in mm:

d	m	s	mw
M5	4	8	2.5
M6	5	10	3.2
M8	6.5	13	4.1
M10	8	17	5.2
M12	10	19	6.6

Dimensions of DIN 557 square nuts in mm

d	dw	m	s
M5	6.7	4	8
M6	8.7	5	10
M8	11.5	6.5	13
M10	14.5/15.5	8	16/17
M12	16.5/17.2	10	18/19
M16	22	13	24

Designations:

d - nominal thread diameter

dw - chamfer diameter, min.

m - nut height

s - width across flats