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Molybdenum Socket Countersunk Screws (DIN 7991)

Molybdenum Socket Countersunk Screws, manufactured to DIN 7991 standard / ISO 10642, feature a flat head and hexagonal drive recess – fastened using a standard hex wrench or insert bit.

The hex drive offers greater efficiency compared to other common drive types e.g. slotted and Phillips drives – providing increased cam-out resistance and enabling higher torque levels. Power drivers can be utilised to further reduce installation time.

Once installed into a pre-drilled countersunk hole, the fastener head sits flush with the target housing to provide an aesthetically pleasing finish.

Molybdenum offers strong levels of corrosion resistance and one of the highest melting points of all pure elements – retaining its strength and toughness at elevated temperatures. This makes Molybdenum Socket Countersunk Screws (DIN 7991) great for use in high-pressure and high-temperature applications, or those subject to extreme conditions.

Available now at Fastenright in thread sizes M3 and M4 as standard, with other sizes available to order on request.

These Socket Countersunk Screws can be supplied in a range of materials including Grade 12.9 Steel, A2 / A4 Stainless Steel and Brass, with other exotic materials such as Aluminium and Titanium also available.

Non-standard sizes, grades and finishes are available to order as specials, including small volume manufacture, modifications and bespoke parts made to drawings. Minimum order quantities apply.
Molybdenum Socket Countersunk Screws (DIN 7991) Technical Drawing

Technical Data & Available Sizes
Thread Diameter M3 M4
dk (mm) 6 8
k (mm) 1.7 2.3
S (mm) 2 2.5
Available Sizes (L) M3 M4
6mm black icon image
8mm black icon image black icon image
10mm black icon image black icon image
12mm black icon image black icon image
16mm black icon image
black icon image = Molybdenum
Size not listed? Please make an enquiry – we may be able to provide it.
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