Firm DIN 7981 Torx Tapping Screw

Xiaoguo® firm DIN 7981 torx tapping screw – custom lengths, coatings, and materials available. Great for blind assembly or high‑torque lines (no cam‑out). Wholesale pricing ready – ask for a quote.

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Product Description

According to the installation conditions, the firm DIN 7981 torx tapping screw supplied by Xiaoguo® have the following five advantages, making them the preferred choice for industrial buyers who wish to buy reliable fasteners for high-torque applications.

firm DIN 7981 torx tapping screw

Situations requiring high torque locking

For example, when fixing the metal bracket onto a thick steel plate or hard wood, if the common cross-slot is used, it may slip when the force is too great. The 6-lobed structure with six petals can withstand higher torque and will not damage the slot, and is suitable for operation with an impact wrench or torque wrench.

Poor vision or narrow operating space

For example, in the corners of the distribution box or deep inside the car chassis, where the eyes cannot see the screw heads, one can only rely on touch. When the wrench is inserted into the 6 lobes, it will automatically align itself and is not prone to being tilted. Moreover, it will not come out after being inserted.

Repair access that needs frequent disassembly and assembly

For example, equipment inspection covers and rear covers of instrument panels. The 6 lobes can be repeatedly inserted and removed without wearing out as quickly as those with cross slots. Combined with stainless steel material, they can be used repeatedly for a long time.

Automated assembly line

During mass production, workers operate the electric screwdriver with a fixed torque. The 6 lobes are closely matched with the wrench and will not come loose due to vibration, reducing the downtime for adjustment. The flat head has a simple shape and the vibrating table feeds the screws smoothly.

Soft base materials (plastic, thin aluminum sheet, wood-plastic composite materials)

The large flat surface of the firm DIN 7981 torx tapping screw pan head can prevent indentation; self-drilling threads are directly formed, unlike machine-drilled screws which require nuts or threading.

firm DIN 7981 torx tapping screw

Mon	ST2.9	ST3.5	ST4.2	ST4.8	ST5.5	ST6.3
P	1.1	1.3	1.4	1.6	1.8	1.8
a	1.1	1.3	1.4	1.6	1.8	1.8
da max	3.5	4.1	4.9	5.6	6.3	7.3
dk max	5.6	7	8	9.5	11	12
dk min	5.3	6.64	7.64	9.14	10.57	11.57
k max	2.4	2.6	3.1	3.7	4	4.6
k min	2.15	2.35	2.8	3.4	3.7	4.3
r max	0.1	0.1	0.2	0.2	0.25	0.25
No.	T10	T15	T20	T25	T25	T30
e	2.8	3.35	3.95	4.5	4.5	5.6
t max	1.27	1.4	1.8	2.03	2.03	2.42
t min	1.01	1.14	1.42	1.65	1.65	2.02
d max	2.9	3.53	4.22	4.8	5.46	6.25
d min	2.76	3.35	4.04	4.62	5.28	6.03
d1 max	2.18	2.64	3.1	3.58	4.17	4.88
d1 min	2.08	2.51	2.95	3.43	3.99	4.7

Customized service

We offer flexible customization services for firm DIN 7981 torx tapping screw.

Customized content

Length: Standard length 4 - 120 mm

Diameter: Customized according to your requirements

Head shape: The diameter and height of the cap can be adjusted slightly according to the drawing.

Specification of the6 lobes： The slot type is customized according to the specified drill bit size you provide.

Thread type: AB type (normal self-tapping), C type (with cutting groove), triangular lock thread.

Material: Carbon steel; Stainless steel 304, 316; Brass, aluminum alloy.

Surface treatment: Electro-galvanizing (blue-white/yellow zinc), hot-dip galvanizing, Dacromet coating, blackening, phosphating, mechanical galvanizing.

Customization process

Provide the drawings (in PDF/DWG format) or send physical samples, specifying the quantity, material and surface requirements.

2-day assessment

After confirmation, the mold will be made and prototyping will be carried out. The samples will be ready in 7 to 15 days.

Small-scale trial production (500 - 2000 pieces), followed by system integration testing. If there are no issues, then mass production will be carried out.

Summary

Whether it's changing the length of the firm DIN 7981 torx tapping screw, changing the material, or designing a completely new specification, just let us know your requirements and we will come up with a solution.