Square Body Nut

A square body nut is a type of fastener designed for attaching cladding made of thin sheet materials to various frames. It is used when welding or other durable joining methods cannot be applied.

The nut is made as a square plate with a hole fitted with internal metric thread; it is placed in a metal housing with spring legs. The fastener is installed into a pre-prepared hole flush with the surface, and is secured on the surface by the nut’s spring legs.

Features and specifications

Nuts of this type are called body nuts or cage nuts — they are widely used in vehicle body assembly. They are made of carbon steel, including zinc-plated versions, as well as corrosion- and weather-resistant stainless steel.

Key characteristics of the fasteners:

• Standard hole size range — from M4 to M10.
• Maximum width of the part including the housing — from 12.2 to 16.6 mm.
• Overall height — from 6 to 7.8 mm.

Applications

Square body nuts are used in mechanical engineering industries, including the automotive industry. They are also used in construction — for attaching thin sheet materials to frames. They can also be used for household tasks.

Dimensions of square body nuts

Designation	d
Square body nut	M5
Square body nut	M6
Square body nut	M8

d a b c d₁ e f g k l m
M5	13.6-14.2	7.7-8.4	8.5	6.0-6.3	13.0-13.5	9.3	7	0.7-1.6	9.5×9.5	11×11×4.5
M6	13.6-14.2	7.7-8.4	8.5	6.0-6.3	13.0-13.5	9.3	7	0.7-1.6	9.5×9.5	11×11×4.5
M6	13.6-14.2	7.7-8.4	9.5	6.0-6.3	13.0-13.5	9.3	7	1.7-2.7	9.5×9.5	11×11×4.5
M8	17.5-18.4	9.9-10.7	10.5	7.4-7.7	16.4-16.9	11.5	10.6	1.0-1.7	12.5×12.5	14×14×5.5
M10	17.5-18.4	9.9-10.7	10.5	7.4-7.7	16.4-16.9	11.5	10.6	1.0-1.7	12.5×12.5	14×14×5.5

Designations:

d - nominal thread diameter of the square nut

a - outer size across the spring legs

b - size between the spring legs

c - spring leg height

d₁ - distance from the nut end face to the sheet material

e - width of the nut housing

f - spring leg width

g - size

k - sheet thickness

l - hole size in the sheet

m - nut size