High Clamping Force
Flat-bottomed pan head maximizes contact area, preventing thin material deformation.
DIN 7981 Cross Recessed Pan Head Tapping Screws
- Standard: DIN 7981
- Material: SUS304, SUS316, SUS410, Carbon Steel
- Thread Size: ST2.2 – ST6.3
- Surface Treatment: Plain, Zinc Plated, HDG, Dacromet, Ruspert
- Thread Type: Self-tapping Thread
- Min Order: 5000pcs
- Sample: Free sample (after quote)
- Delivery time: 30 – 45 Days
Product Overview
Product Application
DIN 7981 is the German standard for cross recessed pan head self-tapping screws (Type C / AB thread). It is widely used for fastening sheet metal, plastics, and thin-gauge materials. During installation, the screw forms its own mating thread in a pre-drilled hole, eliminating the need for pre-tapped threads and improving assembly efficiency.
The DIN 7981 standard has been superseded by ISO 7049, but it remains one of the most commonly specified standards worldwide.
Draw
Specification
Key Dimensions & Geometry
The standard defines the dimensions, drive types, and thread profiles for the fasteners:
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Head Style: Pan Head. It features a flat underside and a rounded, low-profile top with a radius edge. It provides a neat appearance and a wide bearing surface to distribute clamping pressure.
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Drive Types:
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Form H: Phillips cross-recess (most common).
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Form Z: Pozidriv cross-recess (provides better torque transmission and less cam-out).
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Thread Types:
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Type C: Pointed tip (cone point), used for pre-drilled holes in sheet metal.
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Type F: Flat tip (blunt point), often used in blind holes or plastic applications where a sharp point might damage internal components.
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Product Advantages
Efficient Self-Tapping
Eliminates pre-tapping by forming own threads, significantly reducing assembly time.
Automation-Friendly
Cross recess ensures auto-centering and minimizes cam-out, ideal for high-speed production.
Common Questions
Are DIN 7981 and ISO 7049 fully interchangeable?
No. ISO 7049 has slightly larger head diameters and heights, which can cause clearance interference in tight spaces.
Why avoid driving stainless steel (A2/A4) DIN 7981 screws directly into stainless sheets?
Causes galling/locking. Austenitic stainless steel lacks the hardness to cut identical substrates, causing frictional welding.
When to choose Cone Point (Type C) vs. Blunt Point (Type F)?
Use Type C for penetrating sheet metal layers; use Type F for blind holes, restricted rear clearance, or plastics/aluminum castings.
Why is Pozidriv (Type Z) preferred over Phillips (Type H) in automated assembly?
Pozidriv eliminates cam-out. Its parallel wall design handles higher torque without driver slippage, maximizing production uptime.
