Square Weld Nut Mild Steel

Xiaoguo® Square Weld Nut Mild Steel made in China offers a more stable connection than screw connections when subjected to force, and can withstand greater shear and tensile forces. If you have specific purchase information, we will provide you with a reasonable price list for calculation.

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Product Description

Comparison

Square Weld Nut Mild Steel is the most common type of welding square nuts. Its core advantage lies in its excellent welding performance and low cost. Here is a detailed comparison between it and stainless steel welding nuts.

Project	Square Weld Nut Mild Steel	Stainless steel welded square nut
Welding performance	Optimal, low carbon content, stable weld core	Good, but requires matching with stainless steel base material. The electrode life is slightly shorter.
Corrosion resistance	Poor, must apply coating	Excellent, 304 is sufficient for general outdoor use, 316 is suitable for seawater environments
Intensity	4.8/6.8 grade, lower	A2-70/A4-70 ≈ 700 MPa, equivalent to below 8.8 grade
Cost	Low	High (approximately 2-3 times)
Application selection	Indoor, dry, after painting use	Outdoor, humid, corrosive environment

Conclusion: For indoor or general coating environments, Square Weld Nut Mild Steel can be used; for outdoor, marine, food, medical, and other corrosive environments, Stainless steel welded square nut must be selected.

Square Weld Nut Mild Steel

Core advantage

Square Weld Nut Mild Steel is the most common and widely used type of welding square nut. Its core advantages can be summarized as follows:

（1）Welding performance

Carbon content ≤ 0.25%: Meets the strict carbon content requirements for welding nuts as stipulated in DIN 928 standard.

High process tolerance: Not sensitive to fluctuations in welding current, pressure and time, suitable for large-scale automated production.

（2）Four-point protrusion design

The four symmetrically distributed welding protrusions ensure that the current is concentrated and the heat is evenly distributed.

（3）Square shape, automatic anti-rotation

The square base is in alignment with the square hole of the workpiece. During welding, no additional fixtures are required to prevent the nut from rotating.

An optional pilot structure is available, which further precisely positions and prevents welding slag from entering the threads.

Square Weld Nut Mild Steel

d	p	S		H		h		K	D
NominalDiameter	Pitch	BasicDimension	Tolerance	BasicDimension	Tolerance	BasicDimension	Tolerance	BasicDimenson(Aproximate）	BasicDimension	Tolerance
M4	0.7	9.0	0一0.2	3.2	±0.15	0.8	0一0.2	0.2	7.0	一0.1一0.3
M5	0.8	10.0		4.0		0.8		0.2	7.0
M6	1.0	11.0		5.0		0.8		0.2	9.0
M8	1.25	13.0		6.0	±0.2	0.8		0.2	11.0

（4）High cost-effectiveness

The price of low-carbon steel is relatively low

The cold heading forming process is mature, with high production efficiency and low unit cost.

（5）Permanent anti-loosening

After welding, the Square Weld Nut Mild Steel and the workpiece become one piece and will never loosen, especially suitable for vibration environments.

（6）The surface treatment is flexible and can adapt to various environments.

It can be treated through electro-galvanizing, Dacromet coating, hot-dip galvanizing, etc., which can increase the salt spray resistance from a few hours of bare steel to 48 to 1000 hours.