Structural Flat Washer, Steel, Blue PTFE Coated, ASTM F436 Type 1, for 2" screw size

Thicker than standard washers and always made of hardened steel, F436 washers are intended for structural applications. They are the accepted washer for use in assemblies of A325 and A490 bolts as well as with B7 and B16 studs. They help spread bolt pressure evenly to protect surfaces and keep connections tight.

These F436 flat washers studs have a PTFE coating, which is commonly used for several reasons:

Reduced Friction & Easier Installation

PTFE’s non-stick surface makes bolts and hardware spin more freely, allowing consistent torque application and simpler removal. This helps prevent galling and makes assembly more efficient.

Corrosion Resistance & Chemical Protection

The coating forms a protective barrier against acids, harsh chemicals, and moisture. In offshore or other corrosive settings, PTFE can guard both the fastener, associated hardware, and the flange or machinery it’s bolted to—especially when dissimilar metals are involved.

Food-Grade Safety & Inert Properties

PTFE is largely inert, making it suitable for food-processing equipment where contamination or chemical reaction must be minimized.

Color-Coding & Visibility

Brightly colored PTFE coatings (e.g., fluorescent yellow) assist with underwater identification on offshore rigs, enhancing safety and maintenance procedures in low-visibility environments.

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