Stainless Steel DIN 7981 Pan Head Self Tapping Screw

The Stainless Steel DIN 7981 Pan Head Self Tapping Screw produced by Wanluo are manufactured in strict accordance with German industrial standards, specially optimized for rapid fastening of thin plates, plastic profiles and lightweight materials. Different from standard machine screws that require pre-tapped threaded holes, this self-tapping screw features a sharp threaded cutting tip and progressive thread design, enabling one-step drilling and tapping fastening without pre-processing threads.

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Product Description

Wanluo’s China Stainless Steel DIN 7981 Pan Head Self Tapping Screw effectively simplifies assembly procedures, reduces workpiece processing steps, and solves the problems of cumbersome pre-tapping, low efficiency and easy hole deviation in traditional fastening processes. With excellent universality and stable self-tapping performance, it is a mainstream fastener for light industrial assembly, civilian products and shell fixing projects.

Structural Features & Processing Technology

DIN 7981 cross pan head self-tapping screws adopt integrated precision cold forming process with smooth and rounded pan head, no sharp edges after installation, ensuring neat and flat assembly surface. The standard cross recess design perfectly matches universal screwdriver tools, realizing fast manual and electric locking without tool slipping. The sharp and orderly thread profile features high tapping hardness, which can quickly cut into thin metal plates, plastic, wood and other materials without cracking or damaging the workpiece. Made of high-quality stainless steel raw materials, the screw body has uniform hardness, strong cutting performance and excellent corrosion resistance, maintaining stable fastening firmness after long-term use and avoiding loosening or rust failure.

Product Parameter

Parameter Item	Detailed Specification
Product Name	Stainless Steel DIN 7981 Pan Head Self Tapping Screw, Cross Head Tapping Screw
Executive Standard	DIN 7981, ISO Standard, GB Standard, Custom Non-standard Sizes
Available Material	304, 316L Stainless Steel, Carbon Steel Custom Galvanized Treatment
Size Range	ST2.2-ST6.3 full standard self-tapping sizes, custom length available
Head Type	Round pan head, smooth surface, no protruding sharp corners
Drive Type	Standard cross recess, compatible with universal screwdrivers
Surface Treatment	Pickling & passivation, polished burr-free surface, anti-rust and anti-corrosion
Mechanical Properties	Sharp tapping performance, high hardness, stable clamping force, not easy to loose
Packaging Method	Moisture-proof inner packaging + export carton, pallet packing for bulk shipment
Supply Service	Spot inventory supply, non-standard customization, mixed fastener one-stop procurement

Stainless Steel Din 7981 Pan Head Self Tapping Screw

Screw Thread d			ST2.2	ST2.9	ST3.5	(ST3.9)	ST4.2	ST4.8	ST5.5	ST6.3
P	Pitch		0.8	1.1	1.3	1.3	1.4	1.6	1.8	1.8
a	max		0.8	1.1	1.3	1.3	1.4	1.6	1.8	1.8
d_k	max=nominal size		4.2	5.6	6.9	7.5	8.2	9.5	10.8	12.5
d_k	min		3.9	5.3	6.54	7.14	7.84	9.14	10.37	12.07
k	max=nominal size		1.8	2.2	2.6	2.8	3.05	3.55	3.95	4.55
k	min		1.55	1.95	2.35	2.55	2.75	3.25	3.65	4.25
y	max	Type C	2	2.6	3.2	3.5	3.7	4.3	5	6
y	max	Type F	1.6	2.1	2.5	2.7	2.8	3.2	3.6	3.6
Socket No.			1	1	2	2	2	2	3	3
M₁	≈		2.6	3	4.2	4.4	4.6	5	6.5	7.1
M₂	≈		2.4	2.9	3.9	4.1	4.3	4.7	6.2	6.7

Core Advantages & Industrial Applications

1. No pre-tapping required, realizing one-step drilling and fastening, greatly simplifying assembly processes, improving production efficiency and reducing workpiece processing costs for batch assembly.

2. Optimized sharp thread cutting design ensures smooth tapping into thin metal sheets, plastic parts, wood and composite materials, effectively avoiding workpiece cracking, slipping and tooth damage during installation.

3. Smooth round pan head provides large contact bearing area, evenly dispersing locking pressure, protecting thin and fragile workpieces from extrusion deformation, with neat and beautiful installation effect.

4. Premium stainless steel material delivers excellent oxidation and corrosion resistance, adapting to indoor and outdoor light assembly scenarios, maintaining long-term stable fastening performance without rusting or loosening.

5. Universal cross drive and standard size specifications feature strong compatibility, suitable for manual and electric tool assembly, widely used in electronic equipment casings, furniture accessories and light industrial products.

Stainless Steel Din 7981 Pan Head Self Tapping Screw

FAQ

Q1: What is the difference between Stainless Steel DIN 7981 Pan Head Self Tapping Screw and ordinary machine screws?

A1: Ordinary machine screws need matched pre-tapped holes for assembly, while DIN 7981 self-tapping screws have self-drilling and tapping functions, which can directly fasten thin workpieces without pre-threading, featuring higher assembly efficiency and simpler operation.

Q2: What materials are DIN 7981 self-tapping screws suitable for?

A2: They are widely applicable to thin stainless steel plates, iron sheets, plastic profiles, wood boards, resin parts and other lightweight low-hardness materials, ideal for light-load fixing and assembly.

Q3: Will self-tapping screws damage the workpiece during installation?

A3: Our screws adopt precision sharp thread design with smooth cutting performance. Standard installation will not cause workpiece cracking or edge warping, ensuring complete and flat workpiece surface after fastening.

Q4: Can stainless steel self-tapping screws be used outdoors?

A4: Yes. 304/316L stainless steel materials have good weather resistance and salt spray resistance, which can effectively resist outdoor wind and rain erosion, suitable for long-term outdoor light structural fixing.

Q5: Do you support customized special-length self-tapping screws?

A5: Absolutely. We support customizing non-standard screw length, thread pitch and special sharpness to meet personalized fastening requirements of special equipment and customized products.

Hot Tags: Stainless Steel Self Tapping Screws, DIN 7981 Pan Head Screws, Self Tapping Screws Wholesale

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