Stainless Steel DIN 7504K Self-Drilling Screw

The Stainless Steel DIN 7504K Self-Drilling Screw produced by Wanluo are manufactured in strict accordance with German industrial standards, specially developed for rapid fastening of metal plates and steel structure profiles. Different from ordinary self-tapping screws that require pre-drilled holes, this screw adopts an integrated drill bit tail structure, combining drilling, tapping and locking into one single process.

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Product Description

Wanluo factory’s China Stainless Steel DIN 7504K Self-Drilling Screw completely solves the cumbersome procedures of pre-drilling, hole positioning and secondary fastening in traditional assembly, while avoiding problems such as hole deviation, workpiece cracking and low batch production efficiency. With powerful self-drilling capability and stable locking performance, it is a high-efficiency special fastener for steel structure engineering, metal shell assembly and outdoor iron plate fixing.

Structural Advantages & Production Technology

DIN 7504K cross pan head self-drilling screws adopt high-precision cold forging integral forming process. The unique triangular drill tail is precisely ground with sharp cutting edge and accurate drilling angle, which can quickly penetrate steel plates, iron profiles and metal composite plates without pre-opening holes. The standard cross recess fits electric drills and screwdrivers closely, effectively preventing tool slipping during high-speed drilling and locking. The dense and uniform thread profile provides strong grasping force, realizing tight fitting and anti-loosening locking after drilling and forming. Made of high-hardness stainless steel or high-strength carbon steel with surface anti-corrosion treatment, the screw body features high overall hardness, wear resistance and oxidation resistance, ensuring smooth drilling without breaking the tail and long-term stable fastening effect.

Product Parameter

Parameter Item	Detailed Specification
Product Name	Stainless Steel DIN 7504K Self-Drilling Screw, Pan Head Drill Tail Screw
Executive Standard	DIN 7504K, ISO Standard, GB Standard, Custom Non-standard Sizes
Available Material	304 Stainless Steel, 410 Stainless Steel, Carbon Steel Zinc-plated
Size Range	ST3.5-ST6.3 full standard drill tail sizes, custom length available
Head Type	Round pan head, large force-bearing surface, neat assembly appearance
Drive Type	Standard cross recess, compatible with electric & manual tools
Structural Feature	Integrated drill tail, one-piece drilling, tapping and locking
Surface Treatment	Pickling & passivation / Zinc-plated, anti-rust and anti-corrosion
Mechanical Properties	High drilling hardness, strong penetration, no tail breaking, stable anti-loosening
Packaging Method	Moisture-proof inner packaging + export carton, pallet bulk packing
Supply Service	Spot supply, non-standard customization, mixed fastener one-stop procurement

Stainless Steel Din 7504k Self Drilling Screw

Thread Size		ST2.9	ST3.5	(ST3.9)	ST4.2	ST4.8	(ST5.5)	ST6.3
P	Pitch	1.1	1.3	1.3	1.4	1.6	1.8	1.8
a	max	1.1	1.3	1.3	1.4	1.6	1.8	1.8
c	min	0.4	0.6	0.6	0.8	0.9	1	1
d_c	max	6.3	8.3	8.3	8.8	10.5	11	13.5
d_c	min	5.8	7.6	7.6	8.1	9.8	10	12.2
e	min	4.28	5.96	5.96	7.59	8.71	8.71	10.95
k	max	2.8	3.4	3.4	4.1	4.3	5.4	5.9
k	min	2.5	3	3	3.6	3.8	4.8	5.3
k_w	min	1.3	1.5	1.5	1.8	2.2	2.7	3.1
r	max	0.4	0.5	0.5	0.6	0.7	0.8	0.9
s	max	4	5.5	5.5	7	8	8	10
s	min	3.82	5.32	5.32	6.78	7.78	7.78	9.78
d_p		2.3	2.8	3.1	3.6	4.1	4.8	5.8
Drilling range(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

Core Advantages & Industrial Applications

1. Three-in-one function of drilling, tapping and locking eliminates pre-drilling operation, greatly simplifies assembly procedures, effectively improves batch construction efficiency and saves labor and processing costs.

2. High-precision ground drill tail features sharp penetration performance, which can directly drill through thin steel plates, iron sheets and aluminum profiles without workpiece deformation, cracking or hole deviation, ensuring high assembly accuracy.

3. Round pan head design provides large uniform compression surface, which can closely fit the workpiece surface, disperse locking pressure, avoid local indentation damage, and present neat and flat assembly effect.

4. Excellent material hardness and anti-corrosion performance, not easy to break during high-speed drilling operation. Stainless steel and galvanized versions adapt to indoor construction, outdoor open-air facilities and humid corrosive environments for long-term use.

5. Widely applicable to steel structure color steel plate fixing, electrical equipment shell assembly, metal bracket connection, engineering decoration fastener installation and other metal plate fastening scenarios.

Stainless Steel Din 7504k Self Drilling Screw

FAQ

Q1: What is the biggest difference between Stainless Steel DIN 7504K Self-Drilling Screw and ordinary self-tapping screws?

A1: Ordinary DIN7981/DIN7982 self-tapping screws need pre-drilled holes, while DIN 7504K self-drilling screws have a built-in drill bit tail, which can directly drill metal plates without pre-processing, featuring higher efficiency and stronger metal fastening ability.

Q2: What thickness of steel plates can DIN 7504K screws drill through?

A2: Standard drill tail specifications are suitable for conventional thin and medium steel plates. Different sizes correspond to different drilling thickness ranges, which can meet the drilling and fastening requirements of most light steel structures and metal sheet assembly.

Q3: Will the drill tail break during installation?

A3: The screw adopts overall high-hardness heat treatment and precision grinding process. Under standard electric tool operation and matching plate thickness, the drill tail will not break or wear, ensuring stable construction effect.

Q4: Are stainless steel drill tail screws suitable for outdoor engineering?

A4: Yes. 304/316L stainless steel materials have excellent weather resistance and salt spray resistance, which can effectively resist outdoor wind and rain erosion, suitable for long-term fixed installation of outdoor steel structure facilities.

Q5: Can you customize special-length self-drilling screws?

A5: Sure. We support customizing non-standard screw length, special drill tail angle and special surface treatment to meet personalized fastening needs of special engineering and equipment.

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