Double ended insert screws hexagon socket threaded black bolts
Double ended insert screws have the same length threads on each end usually to house a nut. Both ends have chamfered points. A stud is an upright support in the wall of a building to which sheathing, drywall, etc., are attached. Ever Hardware provides custom made double ended insert screws and customizable packaging.
Black oxide or blackening is a conversion coating for ferrous materials, stainless steel, copper and copper based alloys, zinc, powdered metals, and silver solder. It is used to add mild corrosion resistance, for appearance and to minimise light reflection. To achieve maximal corrosion resistance the black oxide must be impregnated with oil or wax. One of its advantages over other coatings is its minimal buildup.
12.9 grade steel means that a component manufactured form this grade of steel has 12X100 N/mm^2 tensile strength and 9 is a multiplier means 90% of 1200 = 1080 N/mm^2 is the yield strength of the grade.
Similarly we also have grade 8.8 , 10.9 , 6.8 also. This is imperial method implied by engineers to differentiate between different sets of steel grade. Mainly used to differentiate the bolts and nuts. like Grade 12.9 Hexagonal Bolt.
Galvanization, or galvanisation, (or galvanizing as it is most commonly called in that industry), is the process of applying a protective zinc coating to steel or iron, to prevent double ended insert screws rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc. Galvanizing protects in three ways:
It forms a coating of zinc which, when intact, prevents corrosive substances from reaching the underlying steel or iron.
The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.
The zinc protects its base metal by corroding before iron. For better results, application of chromates over zinc is also seen as an industrial trend.
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|Category||Double ended insert screws|
|Finish||Galvanization or As request|
|Type||Machine-threaded or As request|
|Material||Teflon/Brass/Stainless steel/carbon steel/Aluminum|
|Place of origin||China Mainland|
|Size option||As request|
|Color||Black or as request|