F436M – ASTM F436 covers the chemical and mechanical requirements for hardened washers in diameters ranging from 1/4″ to 4″ inclusive. These heat treated washers are for general purpose and structural use and are suitable for use with A325 and A490 structural bolts. Additionally, they are used with bolts per A449, A354, A193, A320, F1554 and whenever specified.

F436M / F436 Types

Type 1 Carbon Steel
Type 3 Weathering Steel

F436M / F436 Styles

CircularRound SAE patternSizes 1/4″ through 4″
BeveledBeveled Slope 2 in 12 or 9.5 degrees for use with American standard beamsSizes 1/2″ through 1-1/2″
ClippedCircular or BeveledSizes 1/2″ through 1-1/2″ beveled, 1/4″ through 4″ circular
Beveled F436 washers are normally not available above 1″. Clipped bevel washers are only usually available as specials.

F436M / F436 Mechanical Properties

Plain FinishHot Dip Galvanized
Rockwell Hardness 38 to 45 HRCRockwell Hardness 26 to 45 HRC

F436M / F436 Chemical Requirements

ElementType 1Type 3
Phosphorous, max0.040%0.040%
Sulfur, max0.050%0.050%
Silicon0.15 – 0.35%
Chromium0.45 – 0.65%
Nickel0.25 – 0.45%
Copper0.25 – 0.45%