ASTM F436-11

Scope
This specification covers the chemical, mechanical and dimensional requirements for hardened steel washers for use with fasteners having nominal thread diameters of 1/4″ through 4″ and are intended for for general purpose mechanical and structural use with bolts, nuts, studs and other internally threaded and externally threaded fasteners. These washers are suitable for use with fasteners covered in Specifications A325, A354, A449 and A490.

Type

Type 1 = Carbon Steel

Type 3 = Weathering Steel, comparable to A588 & A709

Style

Circular—Circular washers in nominal bolt sizes 1⁄4 through 4 in. suitable for applications where sufficient space exists and angularity permits.
Beveled—Beveled washers are square or rectangular, in nominal sizes 1⁄2 through 1-1⁄2 in., with a beveled 1 to 6 ratio surface for use with American standard beams and channels.
Clipped—Clipped washers are circular or beveled for use where space limitations necessitate that one side be clipped.
Extra Thick—Extra thick washers are circular washers in nominal sizes 1⁄2 through 1-1⁄2 in., with a nominal thickness of 5⁄16 in. suitable for structural applications with over-sized holes.

Table 1: Chemical Requirementsᴬ

ElementType 1 - Composition %Type3 ᴮ - Composition %
Phosphorus, max - Heat0.0400.040
Phosphorus, max - Product0.0500.0450
Sulfur, max - Heat0.0500.050
Sulfur, max - Product0.0600.055
Silicon - Heat-0.15 - 0.35
Silicon - Product-0.13 - 0.37
Chromium - Heat0.45 - 0.65
Chromium - Product0.42 - 0.68
Nickel - Heat-0.25 - 0.45
Nickel - Product-0.22 - 0.48
Copper - Heat-0.25 - 0.45
Copper - Product-0.22 - 0.48
Source: ASTM F436-11

Table 2: Hardened Circular, Clipped Circular and Extra-Thick Washers

Circular and Extra ThickClipped Circular
NominalCircular, Cliped Circular & Extra ThickCircular & Clipped (T)Extra Thick (T)Clipped Min Edge
SizeOutside Dia (OD)Inside Dia (ID)minmaxminmaxDistance (E) ᴬ, in
1/40.6250.2810.0510.08--0.219
5/160.6880.3440.0510.08--0.281
3/80.8130.4060.0510.08--0.344
7/160.9220.4690.0510.08--0.406
1/21.0630.5310.0970.1770.3050.3750.438
9/161.1880.6250.110.1770.3050.3750.5
5/81.3130.6880.1220.1770.3050.3750.563
3/41.4680.8130.1220.1770.3050.3750.656
7/81.750.9380.1360.1770.3050.3750.781
121.0630.1360.1770.3050.3750.875
1-1/82.251.1880.1360.1770.3050.3751
1-1/42.51.3750.1360.1770.3050.3751.094
1-3/82.751.50.1360.1770.3050.3751.219
1-1/231.6250.1360.1770.3050.3751.313
1-3/43.251.8750.178 ᴮ0.28 ᴮ0.3050.3751.531
23.752.1250.178 ᴮ0.28 ᴮ0.3050.3751.75
2-1/442.3750.34 ᶜ0.34 ᶜ0.3050.3752
2-1/24.52.6250.34 ᶜ0.34 ᶜ0.3130.3752.188
2-3/452.8750.34 ᶜ0.34 ᶜ0.3130.3752.406
35.53.1250.34 ᶜ0.34 ᶜ0.3130.3752.625
3-1/463.3750.34 ᶜ0.34 ᶜ0.3130.3752.875
3-1/26.53.6250.34 ᶜ0.34 ᶜ0.3130.3753.063
3-3/473.9750.34 ᶜ0.34 ᶜ0.3130.3753.313
47.54.1250.34 ᶜ0.34 ᶜ0.3130.3753.5
Source: ASTM F436-11

Table 3: Washer Dimensional Tolerances

Dimensional Characteristics<1" Nominal Size1 Through 1-1/2" Nominal Size>1-1/1" through 3" Nominal Size >3" 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, in0.010.0150.020.032
Concertricity, in: center of hole to O.D.0.030 FIR ᴬ0.060 FIR ᴬ0.090 FIR ᴬ0.250 FIR ᴬ
Burr shall not project above immediately adjacent washer surface more than, in0.010.0150.020.025
Source: ASTM F436

Table 4: Hardened Beveled Washers

SquareSquare Clipped
Bolt DiameterSquare Beveled & Clipped Square Beveled ᴬClipped
Minimum Side Dimension (A)Nominal I.DMean Thickness (T)Slope or Taper ThicknessNominal Edge Distance (E) ᴮ
1/2"1-3/4"17/32"5/16"1:67/16"
5/8"1-3/4"11/16"5/16"1:69/16"
3/4"1-3/4"13/16"5/16"1:621/32"
7/8"1-3/4"15/16"5/16"1:625/32"
1"1-3/4"1-1/8"5/16"1:67/8"
1-1/8"2-1/4"1-1/4"5/16"1:61"
1-1/4"2-1/4"1-3/8"5/16"1:61-3/32"
1-3/8"2-1/4"1-1/2"5/16"1:61-7/32"
1-1/2"2-1/4"1-5/8"5/16"1:61-5/16"
Source: ASTM F436-11

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