Bugle/Round Head Self-drilling Screw

Timber to timber
Flat surface after drill

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Bugle/Round Head Self-Drilling Screws

Bugle/Round Head Self-Drilling Screws are designed for fastening applications where a self-drilling and self-tapping screw with a rounded or bugle-style head is required.

They are mainly used for light sheet metal assembly, and can also be applied to timber, plasterboard, home decoration, and outdoor applications depending on the screw material, point design, and application requirements.

SANN MUO manufactures customized Bugle Head and Round Head Self-Drilling Screws in carbon steel, alloy steel, and stainless steel, with different dimensions, drilling points, coatings, and washer configurations available according to customer drawings and samples.

Bugle/Round Head Self-Drilling Screw Specifications

Specification	Available Options
Product Type	Bugle/Round Head Self-Drilling Screw
Screw Function	Self-Drilling & Self-Tapping
Head Type	Bugle Head / Round Head
Main Application	Light Sheet Metal Assembly
Secondary Applications	Timber, Plasterboard, Home Decoration, Outdoor Deck
Material	Stainless Steel 304 / 316 / 410, Carbon Steel 1022 / 1018, Alloy Steel 10B21 / 10B33
Gauge	#8 – #14
Metric Diameter	M4 – M6.3
Imperial Length	1/2" – 10"
Metric Length	12 – 250 mm
Coating	C1 – C4 / Customized
Washer	EPDM / Steel Bonded Washer Available
Standards	DIN / IFI / ISO / ASTM / ASME
Customization	Drawings and Samples Accepted

What Is a Bugle/Round Head Self-Drilling Screw?

A Bugle/Round Head Self-Drilling Screw combines a self-drilling point with a rounded or bugle-style head.

The self-drilling point allows the screw to penetrate suitable materials without requiring a separate pilot hole, while the screw thread forms the fastening connection during installation.

The head design provides a different surface profile from hex head, pan head, or truss head self-drilling screws.

The product is particularly suitable when the buyer requires:

Self-drilling installation
Self-tapping fastening
Bugle or round head geometry
Light sheet metal assembly
Timber or board applications
Customized screw specifications

Main Features of Bugle/Round Head Self-Drilling Screws

Bugle / Round Head Design

The defining feature of this product is the Bugle/Round Head.

Compared with a hex head self-drilling screw, the bugle or rounded head provides a different contact profile and appearance after installation.

The head design can be selected according to:

Material thickness
Surface appearance
Required bearing area
Installation method
Application requirements

Self-Drilling and Self-Tapping Function

The screw combines drilling and tapping functions into one fastener.

During installation:

Drill → Penetrate → Form Thread → Fasten

This can simplify the fastening process and reduce the need for separate drilling operations in suitable applications.

Suitable for Light Sheet Metal Assembly

The primary application of Bugle/Round Head Self-Drilling Screws is light sheet metal assembly.

Typical applications can include:

Light-gauge sheet metal
Metal panels
Thin metal components
Building materials
General light-duty metal assembly

Application suitability depends on material thickness, screw diameter, drilling point, and required holding performance.

Bugle/Round Head Self-Drilling Screw Applications

Light Sheet Metal Assembly

This is the primary application category for the product.

The self-drilling point allows the screw to drill through suitable light-gauge metal while forming the mating thread.

Timber and Board Applications

Depending on the screw point and material combination, Bugle/Round Head screws can also be used for timber and board applications.

Typical examples include:

Timber panels
Woodworking
Plasterboard
Home decoration

Outdoor Applications

For outdoor applications, material and coating selection becomes important.

Stainless steel or an appropriate corrosion-resistant coating can be selected according to the environmental conditions.

Bugle/Round Head vs. Pan Head vs. Truss Head Self-Drilling Screws

Feature	Bugle / Round Head	Pan Head	Truss Head
Head Profile	Bugle / Rounded	Rounded / Dome	Wide / Low Profile
Head Coverage	Medium	Medium	Large
Bearing Area	Medium	Medium	Large
Main Application	Light Sheet Metal / Board	Light Sheet Metal / Board	Light Sheet Metal / Board
Timber / Board	Suitable	Suitable	Suitable
Main Selection Factor	Head profile and appearance	General-purpose fastening	Large bearing area
Typical Buyer Requirement	Specific head profile	General fastening	Wider surface contact

Which Head Should You Choose?

Choose a Bugle/Round Head when the head geometry and finished appearance are important to the application.

Choose a Pan Head when a conventional rounded screw head is preferred.

Choose a Truss Head when a larger head diameter and wider bearing area are required.

Material and Size Options

SANN MUO manufactures Bugle/Round Head Self-Drilling Screws in:

Stainless Steel 304
Stainless Steel 316
Stainless Steel 410
Carbon Steel 1022
Carbon Steel 1018
Alloy Steel 10B21
Alloy Steel 10B33

Available sizes include:

#8 – #14

M4 – M6.3

Length options include:

1/2" – 10"

or:

12 – 250 mm

Custom sizes can be manufactured according to customer drawings and samples.

Custom Bugle/Round Head Self-Drilling Screws

SANN MUO can customize:

Head diameter
Head profile
Screw diameter
Screw length
Thread
Drilling point
Material
Coating
Washer
Surface finish
Special specifications

Customers can provide an existing screw sample or technical drawing for evaluation.

FAQ About Bugle/Round Head Self-Drilling Screws

Q. What is a Bugle/Round Head Self-Drilling Screw?

It is a self-drilling and self-tapping screw featuring a bugle or rounded head, primarily used for light sheet metal assembly and selected timber or board applications.

Q. What are Bugle Head Self-Drilling Screws used for?

They are mainly used for light sheet metal assembly and can also be used for timber, plasterboard, home decoration, and other suitable applications.

Q. What is the difference between Bugle Head and Hex Head Self-Drilling Screws?

Bugle/Round Head screws have a rounded head profile, while Hex Head screws are designed for hex-drive installation and are widely used for metal and structural fastening.

Q. Can Bugle/Round Head screws be customized?

Yes. SANN MUO can customize dimensions, head design, thread, drilling point, material, coating, and washer according to customer requirements.

Q. Can SANN MUO supply these screws as a second source?

Yes. Customers can provide an existing sample or drawing for specification evaluation and second-source development.

SELF DRILLING SCREWS
Self drilling screws are very easy to install, but con- tractors still encounter challenges like penetration speed or functioning problems. Therefore, it is our goal to eradicate those challenges by making self-drilling screws that are faster at drilling and are more stabilized.

Easy to use
SEC's Nick Point self-drilling tip contains a small indent slightly on the side of the screw tip. It has been verified through many experiments and comparisons to have a consist shorter drilling time. Furthermore, our feedback from construction staffs indicating an effortless quick drilling speed.

Stable quality
Our self-drilling screws have a better penetration point that is slip resistant. Besides, a single SEC self-drilling screw can be redrilled 5 times without affecting performance.

Suitable coating
Depending on the environment at which your self-drilling screws are applied, we are able to coat these products according to C1-C4 specifications or according to your own customized specifications.own customized specifications.

Any customization
The SEC self-drilling screw can be matched with any EPDM size or steel bonded washer. We can also paint the screw head to the color of your roof or wall.

Common Applications

Steel Truss

Metal siding

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