Flat Fillister Head Allen Socket Drive Large Custom Marine SS Step Bolts

The flat fillister head is cylindrical, but with a slightly convex top surface. The height to diameter ratio is larger than the cheesehead. 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. Ever Hardware provides custom-made flat fillister head bolt and customizable packaging.

Cold forming is the process of forging metals at near room temperatures.
In cold forming metal is formed at high speed and high pressure into tool steel or carbide dies. The cold working of the metal increases the hardness, yield, and tensile strength.
The cold heading process used is similar but specifically refers to the upsetting of a volume of metal into a head like on a nail or screw.
Cold Forming and Cold-Heading processes are flexible. Parts can be hit multiple times while staying in one die (“one die, multiple blows”), or transferred from dying to die to progressively form various geometries (“multi-die forming”).

Stainless steel does not readily corrode, rust or stain with water as ordinary steel does. However, it is not fully stain-proof in low-oxygen, high salinity, or poor air-circulation environments. There are different grades and surface finishes of stainless steel to suit the environment the alloy must endure. Stainless steel is used where both the properties of steel and corrosion resistance are required. Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal’s internal structure. Passivation occurs only if the proportion of chromium is high enough and oxygen is present.

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