DIN 557 Square Nuts

What is a DIN 557 Square Nut?

DIN 557 standard square nuts are four-sided nuts. They have a larger contact surface area, allowing for greater torque to be applied when tightening, making them less prone to loosening.

Beyond Fastener stocks metric standard square nuts in diameters ranging from M5 to M12; 6# to 1/2″. Click on the link to view related products: Square Nuts.

Specifications

MM	P	e max	e min	k max	k min	s max	s min
M5	0.8	11.3	9.93	4	3.52	8	7.64
M6	1	14.1	12.53	5	4.52	10	9.64
M8	1.25	18.4	16.34	6.5	5.92	13	12.57
M10	1.5	22.6	20.24	8	7.42	16	15.57
M12	1.75	25.4	22.84	10	9.42	18	17.57
M16	2	33.9	30.11	13	12.3	24	23.16

Square Nuts vs Hex Nuts

Feature	Square Nuts	Hex Nuts
Shape	4 sides	6 sides
Surface Contact	Larger	Smaller
Anti-loosening	Better	Standard
Installation	Easier in slots	Standard use
Application	Wood, channels	General fastening

Applications of DIN 557 Square Nuts

• Construction structures
• Wooden assemblies
• Furniture manufacturing
• Agricultural machinery
• Rail and infrastructure
• Industrial equipment

DIN 557 Square Nut Supplier

We are a trusted global fastener manufacturer supplying high-quality DIN 557 square nuts.

• Full size range (M4–M64)
• OEM & custom manufacturing
• Strict quality control
• Multiple materials & coatings
• Fast delivery
• Global export experience

FAQ – DIN 557 Square Nuts

What is DIN 557?

DIN 557 is a standard for square nuts used in structural and industrial applications.

What are square nuts used for?

They are used in construction, wood assemblies, and machinery where anti-rotation is important.

Are square nuts stronger than hex nuts?

They provide better surface contact but strength depends on material and grade.

Can DIN 557 nuts be used with carriage bolts?

Yes, they are commonly used together.

Are custom sizes available?

Yes, OEM production is supported.