ASTM F436 Type 3

ASTM F436 type 3 is a standard material and dimensional specification for weathering steel washers, intended for general-purpose mechanical and structural use with bolts, nuts, studs, and other internally and externally threaded fasteners. Find chemical, mechanical and dimensional requirements for type 3 weathering steel washers for use with fasteners having nominal thread diameters of 1/4 through 4 inch. Boltport manufactures and stocks full range of type 3 weathering steel washers to ASTM F436 specification.

Chemical Composition [Note A]

Elements Composition, %
Type 1 Type 3 [Note B]
Phosphorus, max Heat 0.040 0.040
Product 0.050 0.045
Sulfur, max Heat 0.050 0.050
Product 0.060 0.055
Silicon Heat -- 0.15 - 0.35
Product -- 0.13 - 0.37
Chromium Heat -- 0.45 - 0.65
Product -- 0.42 - 0.68
Nickel Heat -- 0.25 - 0.45
Product -- 0.22 - 0.48
Copper Heat -- 0.25 - 0.45
Product -- 0.22 - 0.48

Mechanical Properties [Hardness Requirement]

Surface Through Hardened Carburized Carburized and Hardened
Plain 38 - 45 HRC 69 - 73 HRA 30 HRC or 65 HRA
Hot Dip Galvanized 26 - 45 HRC 79 - 83 HR15N

Dimensions [Hardened Circular, Clipped Circular, and Extra-Thick Washers]

Circular, Clipped Circular and Extra Thick Thickness(T), in. Clipped
Nominal
Size		 Nominal Outside
Diameter (OD), in.		 Nominal Inside
Diameter (ID), in.		 Circular and Clipped Extra Thick Min. Edge
Distance(E)A, in.
min max min max
1/4 0.625 0.281 0.051 0.080 - - 0.219
5/16 0.688 0.344 0.051 0.080 - - 0.281
3/8 0.813 0.406 0.051 0.080 - - 0.344
7/16 0.922 0.469 0.051 0.080 - - 0.406
1/2 1.063 0.531 0.097 0.177 0.305 0.375 0.438
9/16 1.188 0.625 0.110 0.177 0.305 0.375 0.500
5/8 1.313 0.688 0.122 0.177 0.305 0.375 0.563
3/4 1.468 0.813 0.122 0.177 0.305 0.375 0.656
7/8 1.750 0.938 0.136 0.177 0.305 0.375 0.781
1 2.000 1.063 0.136 0.177 0.305 0.375 0.875
1 1/8 2.250 1.188 0.136 0.177 0.305 0.375 1.000
1¼ 2.500 1.375 0.136 0.177 0.305 0.375 1.094
1 3/8 2.750 1.500 0.136 0.177 0.305 0.375 1.219
1 ½ 3.000 1.625 0.136 0.177 0.305 0.375 1.313
1 ¾ 3.375 1.875 0.178B 0.28B 0.305 0.375 1.531
2 3.750 2.125 0.178B 0.28B 0.305 0.375 1.750
2 ¼ 4.000 2.375 0.24C 0.34C 0.305 0.375 2.000
2 ½ 4.500 2.625 0.24C 0.34C 0.313 0.375 2.188
2 ¾ 5.000 2.875 0.24C 0.34C 0.313 0.375 2.406
3 5.500 3.125 0.24C 0.34C 0.313 0.375 2.625
3 ¼ 6.000 3.375 0.24C 0.34C 0.313 0.375 2.875
3 ½ 6.500 3.625 0.24C 0.34C 0.313 0.375 3.063
3 ¾ 7.000 3.875 0.24C 0.34C 0.313 0.375 3.313
4 7.500 4.125 0.24C 0.34C 0.313 0.375 3.500

Note :
A : Clipped edge E shall be not closer than 7/8 of the bolt diameter from the center of the washer.
B : 3/16 in. nominal.
C : 1/4 in. nominal.

Dimensions [Hardened Bevelled Washers]

Bolt Size, in. Min Side
Dimension (A), in.		 Nominal Inside
Diameter(I.D), in.		 Mean Thickness
(T), in.		 Slope or Taper
in Thickness		 Nominal Edge
Distance(E)B, in.
1/2 1 3/4 17/32 5/16 1.6 7/16
5/8 1 3/4 11/16 5/16 1.6 9/16
3/4 1 3/4 13/16 5/16 1.6 21/32
7/8 1 3/4 15/16 5/16 1.6 25/32
1 1 3/4 1 1/8 5/16 1.6 7/8
1 1/8 2 1/4 1 1/4 5/16 1.6 1
1 1/4 2 1/4 1 3/8 5/16 1.6 1 3/32
1 3/8 2 1/4 1 1/2 5/16 1.6 1 7/32
1 1/2 2 1/4 1 5/8 5/16 1.6 1 5/16

Note :
A : Rectangular beveled washers shall conform to the dimensions shown above, except that one side may be longer than that shown for the A dimension.
B : Clipped edge E shall not be closer than 7/8 of the bolt diameter from the center of the washer.

Dimensional Tolerances

Dimensional Characteristics <1 in.
Nominal Size		 1 through 1½ in. Nominal Size >1 ½ through 3 in.
Nominal Size		 >3in.
Nominal Size
Nominal diameter of hole, in. -0, +0.032 -0, +0.063 -0, +0.063 -0, +0.125
Nominal outside diameter, in. +_0.032 +_0.063 +_ 0.063 +_ 0.125
Flatness: max deviation from straightedge placed on cut side shall not exceed (in.) 0.010 0.015 0.020 0.032
Concentricity, in : center of hole to outside diameter 0.030 FIRA 0.060 FIRA 0.090 FIRA 0.250 FIRA
Burr shall not project above immediately adjacent washer surface more than (in.) 0.010 0.015 0.020 0.025

A : Full indicator runout.

Washer Marking

Grade Identification Marking
Type 3 "F436 3"