AYA FASTENERS Guide | What Are Cup Head Square Neck Bolts?

Carriage bolts or Cup Head Square Neck Bolts are highly useful fasteners with unique features. As they are cup head neck bolts, their head shape resembles a cup. So, you will find a rounded, smooth surface on the heads of these bolts. You can use them safely, as there is no risk of a protruding head.
Moreover, the square neck is just beneath the bolt's head. The square-shaped design prevents the fastener from rotating when you tighten the nuts.

The carriage bolts are available in various diameters and lengths. Based on the material's thickness and other factors, you can choose the bolt's size during the purchase. Besides, these bolts are made from various materials like stainless steel.
As these bolts have coarser threads, you can use them in applications where joints need fine-tuned adjustments.

bolts with square neck dimension table (DIN 603)

news-1-1

Screw Thread
d

M10

M12

M16

M20

P	Pitch
b	L≤125
	125＜L≤200
	L＞200
d_k	max
d_k	min
d_s	max
d_s	min
k₁	max
k₁	min
k	max
k	min
r₁	≈
r₂	max
r₃	max
s	max
s	min

0.8	1	1.25	1.5	1.75	2	2.5
16	18	22	26	30	38	46
22	24	28	32	36	44	52
/	/	41	45	49	57	65
13.55	16.55	20.65	24.65	30.65	38.8	46.8
12.45	15.45	19.35	23.35	29.35	37.2	45.2
5	6	8	10	12	16	20
4.52	5.52	7.42	9.42	11.3	15.3	19.16
4.1	4.6	5.6	6.6	8.75	12.9	15.9
2.9	3.4	4.4	5.4	7.25	11.1	14.1
3.3	3.88	4.88	5.38	6.95	8.95	11.05
2.7	3.12	4.12	4.62	6.05	8.05	9.95
10.7	12.6	16	19.2	24.1	29.3	33.9
0.5	0.5	0.5	0.5	1	1	1
0.75	0.9	1.2	1.5	1.8	2.4	3
5.48	6.48	8.58	10.58	12.7	16.7	20.84
4.52	5.52	7.42	9.42	11.3	15.3	19.16

Why use Cup Head Square Neck Bolts?

The square-shaped neck lying beneath the bolt's neck cannot rotate when you install an object.

01/

It is a highly advantageous feature when you need to fasten the components of any wooden items.

02/

Easy installation is another common reason for choosing carriage bolts for your project. Their square neck allows you to keep the bolts in place while tightening the nuts. So, the installation will not be a hassle.

03/

There is also no risk of tampering because Cup Head Square Neck Bolts have a tamper resistance design. Workers cannot alter screws and equipment.

04/

From an aesthetic perspective, these bolts are the best choice. Their rounded cup heads with smooth surfaces have a pleasing look. So, you can choose these bolts for applications where the fasteners remain visible.

05/

Carriage bolts are made from quality materials that make them corrosion-resistant. Thus, you can use them for outdoor applications. Their contact with harsh weather elements and moisture will not cause damage.

06/

The bolts ensure a stable and secure connection between pieces. As the bolts do not have protruding heads, they will not cause hazards to the user.

■ Applications ■

◎ Manufacturers and contractors associated with the construction and woodworking industries can invest in carriage bolts. They can use the bolts to join wooden parts. For instance, bolts allow them to secure frames or attach doors to hinges.
◎ Moreover, these fasteners are used while dealing with outdoor projects, such as the installation of decks and fences. Bolts with galvanized finishes are resistant to corrosion and designed for outdoor usage.
◎ Railroad constructors also can use bolts with square neck for securing the rails.
◎ Even the agricultural equipment manufacturing sector uses cup head bolts to secure components in the machinery.
◎ Besides, you can use them for your wooden boat-building projects.
◎ So, cup head square neck bolts have several applications in different wooden projects. You can buy bolts of perfect size to leverage benefits from these fasteners.

10/20/50pcs M3 M4 M5 M6 Black 304 Stainless Steel Cup Head Square Neck Bolts Screws (Color : M4x0.7x8mm - 20pcs) : Amazon.co.uk: DIY & Tools

Looking for Fasteners?
Click below to browse AYA FASTENERS' extensive Fastener catalog, including high-quality screws, bolts, nuts, and washers products.

CONTACT AYA FASTENERS