M8-1.25 DIN 9841 Hexagon Socket Head Shoulder Screw Black Oxide Grade 12.9

Description

M8-1.25 DIN 9841 hexagon socket head shoulder screw ISO 7379 are cost-saving construction elements for a wide variety of different uses. The maximum tightening torque must not be defined by strength class 12.9, it is instead limited by the relatively small bearing points (shoulders) and by the recesses at the transition point from the diameter of the shoulder to the thread diameter and the diameter of the shoulder to the head diameter. Ever Hardware provides fasteners and customizable packaging.

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.

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 minimize light reflection. To achieve maximum 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 M8-1.25 DIN 9841 hexagon socket head shoulder screw 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 6.8, 8.8, 10.9 also. This is an imperial method implied by engineers to differentiate between different sets of steel grades. Mainly used to differentiate the bolts and nuts. like Grade 12.9 Hexagonal Bolt.