Countersunk Self-Drilling Screws – Flush Fastening for Metal, Wood & Composite Panels

csk self drilling screw

D1	2.9	3.5	3.9	4.2	4.8	5.5	6.3
D2	5.5	6.8	7.5	8.1	9.5	10.8	12.4
k	1.7	2.1	2.3	2.5	3	3.4	3.8
Steel	1800-2500	1800-2500	1800-2500	1800-2500	1800-2500	1000-1800	1000-1800
Torque/Nm	1.5	2.8	3.8	4.7	6.9	10.4	16.9
m	3	4.2	4.6	4.7	5.1	6.8	7.1
Bit No	1	2	2	2	2	3	3
L1	4.5	5	6	7	8	10	11
Plate Thickness	0.7-1.9	0.7-2.25	0.7-2.4	1.75-3	1.75-4.4	1.75-5.25	2-6

carbon steel countersink drill tail screw

Inch Size	Metric Size	Inch Size	Metric Size	Inch Size	Metric Size
#7X1/2''	3.9X13	#8x1/2''	4.2x13	#10x1/2''	4.8x13
#7X5/8''	3.9X16	#8x5/8''	4.2x16	#10x5/8''	4.8x16
#7X3/4''	3.9x19	#8x3/4''	4.2x19	#10x3/4''	4.8x19
#7X1''	3.9x25	#8x1''	4.2x25	#10x1''	4.8x25
#7X1 1/4''	3.9x32	#8x1 1/4''	4.2x32	#10x1 1/4''	4.8x32
#7X1 1/2''	3.9x38	#8x1 1/2''	4.2x38	#10x1 1/2''	4.8x38
#7X2''	3.9x50	#8x2''	4.2x50	#10x2''	4.8x50
#7x2 1/2''	3.9x63	#8x2 1/2''	4.2x63	#10x2 1/2''	4.8x63
#7x3''	3.9x75	#8x3''	4.2x75	#10x3''	4.8x75
		#8x3 1/5''	4.2x80	#10x3 1/5''	4.8x80
		#8x3 1/2''	4.2x90	#10x3 1/2''	4.8x90
		#8x4''	4.2x100	#10x4''	4.8x100

Cross Recessed Countersunk Head Self-Drilling Screws

countersunk self drilling screw manufacture

Typical Applications

CSK self-drilling screws are commonly used in:

Metal roofing and wall cladding systems

Light steel framing and drywall tracks

Sheet metal to steel connections

Aluminum and thin steel panel fixing

Interior finishing where flush surfaces are required

They are especially suitable where speed, appearance, and consistency are critical.

These screws are designed with a countersunk (flat) head and a cross recessed (Phillips) drive, allowing them to sit flush with the surface for a neat finish. The self-drilling tip eliminates the need for pre-drilling, saving installation time and ensuring secure fastening in steel and wood.

Key Features

Head Type

Countersunk (flat head)

Drive Type

Cross recessed (Phillips drive, typically PH2)

Point

Self-drilling (Tek point) for fast penetration into steel and wood

Material

Carbon steel or stainless steel

Surface Finish

Zinc plated, black phosphate, nickel plated, or other custom coatings

Standards

DIN 7504, ISO 7049, ANSI standards available

Applications

Fastening metal sheets to steel structures

Securing wood-to-metal connections

Installation of drywall, gypsum boards, and plasterboards

Used in furniture assembly, construction, and mechanical industries

Ideal for projects requiring flush surface finishes

advantage

No pre-drilling required – saves time and labor

Flush countersunk head ensures smooth and clean appearance

Cross recessed drive provides excellent torque transmission

Corrosion-resistant finishes extend service life

Suitable for high-speed power driver installation

FAQ

Q: When can I get quotation ?

A: All your inquiry or price request can be answered within 12 hours while we got your detailed request for the product.

Q: How can I get sample to check your quality?

A: Free sample can be arranged for testing based on prepaid DHL or Fedex account.

Q: ODM OEM is workable or accepted?

A: Yes. Packing with your own Logo is workable and OEM is accepted

Q: How about your delivery time?

A: Normally it will depend on the quantity.

Q: You are a manufacture or Trader?

A: We are 100% manfacture with nearly 20 years history.

Q: What is your payment term?

A: TT,LC or Negotiable.

Q: Workable to pay visit to your factory?

A: Sure. We welcome all customers to pay a visit to our factory to know more about us for long term business.

Q: How about the quality of your product.

A: All product will be tested in a random way before it delivered.

1 Section: What Problem Do Countersunk Self-Drilling Screws Solve?

Answer real user questions by addressing problems:

Need for pre-drilling adds time and labor

Uneven surface finish with protruding fasteners

Risk of material deformation or lifting around the hole

Loose engagement in thin metal or wood layers

2 Section: Design Features & Practical Benefits

Break down features into benefits buyers care about:

Countersunk Head

Sits level with the panel surface

Reduces snagging and interference with overlay finishes

Creates a neat, professional look

Self-Drilling Tip

Penetrates material without pre-drilling

Saves installation time

Improves alignment with substrate

Thread Engagement

Provides secure grip in thin sheet steel and wood

Maintains joint integrity under vibration

Improves pull-out resistance

3 Section: Typical Use Cases & Installation Scenarios

List scenarios where buyers are searching for solutions, not just products:

Metal roof and wall panel installation

Steel frame assemblies

Decking and board attachments

Equipment enclosure building

Composite panel joinery

Retrofit applications where surface finish matters

4 Section: Installation Tips & Best Practices

Help users reduce common mistakes - this yields high SEO value:

Align panels before fastening to avoid misalignment

Use torque-controlled drivers to prevent over-tightening

Ensure proper countersink depth for flush finish

Check material thickness and choose appropriate screw length

What Makes CSK Self-Drilling Screws Different?

In many construction and fabrication projects, traditional screws require:

Pre-drilling

Separate countersinking

Additional installation time

The CSK self-drilling screw solves these issues by combining drilling, tapping, and fastening into one operation. Once installed, the countersunk head sits level with the surface, reducing snagging, improving safety, and enhancing visual consistency.

Material & Surface Finish Options

To suit different environments and service conditions, CSK self-drilling screws are available in multiple material and coating options.

Materials

Carbon steel (standard construction use)

Stainless steel (for corrosion-resistant applications)

Surface Treatments

Zinc plated (white / blue)

Ruspert / mechanical zinc

Black phosphate

Custom coatings available upon request

These options help extend service life in indoor, outdoor, and humid environments.

Production Process & Quality Control

Each CSK self-drilling screw is manufactured under controlled production procedures to ensure stable performance:

Raw material selection and inspection

Cold heading of countersunk head

Precision thread forming

Drill point shaping and heat treatment

Surface coating application

Final inspection for dimensions, hardness, and coating thickness

This process ensures reliable drilling performance and consistent quality.

Packaging, Shipping & Supply Capability

Packaging Options

Bulk packing

Small boxes with outer cartons

Palletized packaging for export

OEM branding and customized packaging available

Shipping Methods

Sea freight (FCL / LCL)

Air freight for urgent orders

Express courier for samples

We support both small test orders and large-volume supply.

Payment Terms & Business Support

Payment methods: T/T, L/C at sight

OEM / ODM: Size, coating, and packaging customization supported

Documents: Packing list, CO, inspection reports available

Flexible cooperation terms are available for long-term partners.

Why Choose CSK Self-Drilling Screws?

CSK self-drilling screws provide a practical solution for projects that demand flush installation, fast assembly, and dependable performance. Their integrated drilling capability reduces installation steps, while the countersunk head delivers a clean finish suitable for modern construction and fabrication needs.

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