Special type socket head cap screw custom made grade 12.9 black oxide

Special type socket head cap screw is commonly used in machine parts, die fixturing, and clamping. The flat socket head enables driving where there is not sufficient space for wrenches or sockets, and allows the screw head to sit flush with the surface. Ever Hardware provides custom made special type socket head cap screw and customizable packaging.

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.

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.

The hex socket screw drive has a hexagonal recess and may be driven by a hex wrench, also known as an Allen wrench, Allen key, hex key or inbus as well as by a hex screwdriver (also known as a hex driver) or bit. Tamper-resistant versions with a pin in the recess are available.
The German company Bauer & Schaurte patented the hex socket 1936 in Germany, and offered products based on it to the market. The abbreviation “Inbus” is derived from “Innensechskant Bauer & Schurte”, analogous to the US use of “Allen key”.

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Category Special Type Socket Head Cap Screw
Finish Oxide or As request
Type Machine-threaded or As request
Material Teflon/Brass/Stainless steel/carbon steel/Aluminum
Brand Ever Hardware
Place of origin China Mainland
Size option As request
Color Black or as request

Special type socket head cap screw custom made grade 12.9 black oxideEver Hardware Industrial Limited

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