ASTM F436

ASTM F436 Standard – Hardened Steel Washers

ASTM F436 specifies the requirements for hardened steel washers that range in size from 1/4" up to 4" in diameter. These washers are heat-treated to provide the necessary strength for both general applications and heavy structural connections.

They are commonly paired with A325 and A490 high-strength structural bolts, ensuring reliable load distribution and durability. In addition, ASTM F436 washers are suitable for use with several other bolt grades, including A449, A354, A193, A320, and F1554, or whenever a project specifically calls for them.

F436 Types:

Washer Type	Material Description
Type 1	Made from carbon steel for general applications
Type 3	Manufactured using weathering steel for improved corrosion resistance

F436 Styles:

Washer Style	Description	Available Sizes
Circular	Standard round design, commonly used in SAE pattern applications.	1/4" up to 4"
Beveled	Designed with an angled surface (approx. 2:12 slope or 9.5°) to match structural beam flanges.	1/2" to 1-1/2"
Clipped	Available in round or beveled form, made to fit tight clearance applications.	Circular: 1/4"–4" Beveled: 1/2"–1-1/2"

F436 Mechanical Properties:

Plain Steel Finish	Hot-Dip Galvanized Finish
Typical hardness range: 38 – 45 HRC	Typical hardness range: 26 – 45 HRC

F436 Chemical Requirements:

Chemical Element	Type 1 – Standard Steel	Type 3 – Weathering Steel
Phosphorus (max)	0.040%	0.040%
Sulfur (max)	0.050%	0.050%
Silicon	Not specified	0.15 – 0.35%
Chromium	Not specified	0.45 – 0.65%
Nickel	Not specified	0.25 – 0.45%
Copper	Not specified	0.25 – 0.45%