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ASTM F436/F436M Washers Specification

Metric and Imperial(Inch) Series Hardened Steel Washers for structural use

Related Specifications of ASTM F436/F436M Bolting

A307 A320 A325 A354 A394 A449 A490 A588/A588M F432 F844 F959 F1554 F2482 F2882 F3125 F3148 A242/A242M A588/A588M A606/A606M A709/A709M

ASTM F436/F436M Circular, Beveled, Clipped, Extra Thick Washers, Taper Washers

ASTM F436 / F436M specification covers the chemical, mechanical, and dimensional requirements for Metric and Imperial(Inch) Series Hardened Steel Washers for structural use with fasteners having nominal thread diameters of 1/4 through 4 in. and M12 through M100. These washers are intended for general-purpose mechanical and structural use with bolts, nuts, studs, and other internally and externally threaded fasteners. These washers are suitable for use with fasteners covered in Specifications A354, A449, A563, A563M, F959/F959M, and F3125. Steel used in the manufacture of washers shall be produced by the open-hearth, basic-oxygen, or electric-furnace process. Washers up to and including 11/2 in. for inch fasteners and M36 for metric fasteners, shall be through hardened. Washers over 11/2 in. for inch fasteners and M36 for metric fasteners, may be either through hardened or carburized at the option of the manufacturer. Unless otherwise specified, washers shall be furnished "plain" with the "as-fabricated" surface finish without protective coatings.

ASTM F436/F436M Chemical Requirements

Element Analysis Composition, %
Type 1 Type 3B
 P, max Heat analysis  0.040  0.040 
 Product analysis   0.050  0.045
 S, max Heat analysis  0.050   0.050 
 Product analysis  0.060  0.055
 Si Heat analysis  . . .   0.15-0.35
 Product analysis  . . .  0.13-0.37
 Cr Heat analysis  . . .  0.45-0.65 
 Product analysis  . . .  0.42-0.68
Ni Heat analysis  . . .   0.25-0.45 
 Product analysis  . . .  0.22-0.48
Cu Heat analysis  . . .  0.25-0.45
 Product analysis  . . .  0.22-0.48
  • (A) When providing Weathering Steels to a calculated corrosion index use the Legault-Leckie formula from Guide G101.  
  • I = 26.01 (% Cu) + 3.88( % Ni) + 1.20 (% Cr) + 1.49 (% Si) + 17.28 (% P) - 7.29 (% Cu) - 9.10( % Ni) (% P)- 33.39 (%Cu)2
  • (B) Weathering steel washers may also be manufactured from any of the steels listed in Table 2 of Specification A588/A588M and F3125.

ASTM F436/F436M Mechanical Requirements

ASTM F436 Hardened Circular, Clipped Circular, and Extra (Inch Washers)

ASTM F436 Hardened Circular, Clipped Circular, and Extra (Inch Washers)

Nominal WasherD Size Inch Clipped Circular Circular and Extra Thick
Inside Diameter (I.D)Inch Outside Diameter (O.D.) Inch Thickness Standard (T) Inch Thickness Extra Thick (T) Inch Clipped
min max min max min max min max Minimum Edge Distance (E)A
1/4 0.281 0.313 0.593 0.657 0.051 0.080 . . .  . . .  0.219
5/16 0.344 0.376 0.656 0.720 0.051 0.080 . . .  . . .  0.281
3/8 0.406 0.438 0.781 0.845 0.051 0.080 . . .  . . .  0.344
7/16 0.469 0.501 0.890 0.954 0.051 0.080 . . .  . . .  0.406
1/2 0.531 0.563 1.031 1.095 0.097 0.177 0.305 0.375 0.438
9/16 0.625 0.657 1.156 1.220 0.110 0.177 0.305 0.375 0.500
5/8 0.688 0.720 1.281 1.345 0.122 0.177 0.305 0.375 0.563
3/4 0.813 0.845 1.436 1.500 0.122 0.177 0.305 0.375 0.656
7/8 0.938 0.970 1.718 1.782 0.136 0.177 0.305 0.375 0.781
1 1.063 1.126 1.937 2.063 0.136 0.177 0.305 0.375 0.875
11/8 1.188 1.251 2.187 2.313 0.136 0.177 0.305 0.375 1.000
11/4 1.375 1.438 2.437 2.563 0.136 0.177 0.305 0.375 1.094
13/8 1.500 1.563 2.687 2.813 0.136 0.177 0.305 0.375 1.219
11/2 1.625 1.688 2.937 3.063 0.136 0.177 0.305 0.375 1.313
13/4 1.875 1.938 3.312 3.438 0.178B 0.28B 0.305 0.375 1.531
2 2.125 2.188 3.687 3.813 0.178B 0.28B 0.305 0.375 1.750
21/4 2.375 2.438 3.937 4.063 0.24C 0.34C 0.305 0.375 2.000
21/2 2.625 2.688 4.437 4.563 0.24C 0.34C 0.313 0.375 2.188
23/4 2.875 2.938 4.937 5.063 0.24C 0.34C 0.313 0.375 2.406
3 3.125 3.188 5.437 5.563 0.24C 0.34C 0.313 0.375 2.625
31/4 3.375 3.500 5.875 6.125 0.24C 0.34C 0.313 0.375 2.875
31/2 3.625 3.750 6.375 6.625 0.24C 0.34C 0.313 0.375 3.063
33/4 3.875 4.000 6.875 7.125 0.24C 0.34C 0.313 0.375 3.313
4 4.125 4.250 7.375 7.625 0.24C 0.34C 0.313 0.375 3.500
  • (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.
  • (D) Nominal washer sizes are intended for use with fasteners of the same nominal thread size.

ASTM F436 Hardened Beveled Washers (Inch Washers)

ASTM F436 Hardened Beveled Washers (Inch Washers)

Bolt Size, in. Square Square Clipped
Square Beveled and Clipped Square BeveledA Clipped
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.
min max min max . . . . . . . . .
1/2 1.718 1.782 0.531 0.563 0.312 1:6 0.438
5/8 1.718 1.782 0.688 0.720 0.312 1:6 0.562
3/4 1.718 1.782 0.812 0.844 0.312 1:6 0.656
7/8 1.718 1.782 0.938 0.970 0.312 1:6 0.781
1 1.718 1.782 1.125 1.188 0.312 1:6 0.781
11/8 2.187 2.313 1.250 1.313 0.312 1:6 0.875
11/4 2.187 2.313 1.380 1.443 0.312 1:6 1.000
13/8 2.187 2.313 1.500 1.563 0.312 1:6 1.094
11/2 2.187 2.313 1.625 1.688 0.312 1:6 1.219
  • (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.

ASTM F436 Washer Dimensional Tolerances (Inch washers)

Dimensional Characteristics <1 in. 
Nominal Size		 1 through 11/2 in. Nominal Size >11/2 through 3 in. Nominal Size >3 in. 
Nominal Size
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 reading.

ASTM F436M Dimensions of Circular Washers (Metric Washers)

ASTM F436M Dimensions of Circular Washers (Metric Washers)

Nominal Washer Size, mm A Inside Diameter (A), mm Outside Diameter (B), mm Thickness (C), mm Clipped Width (E), mm, min B
min max min max min max
12 14.0 14.4 25.7 27.0 3.1 4.6 10.5
14 16.0 16.4 28.7 30.0 3.1 4.6 12.2
16 18.0 18.4 32.4 34.0 3.1 4.6 14.0
20 22.0 22.5 40.4 42.0 3.1 4.6 17.5
22 24.0 24.5 42.4 44.0 3.4 4.6 19.2
24 26.0 26.5 48.4 50.0 3.4 4.6 21.0
27 30.0 30.5 54.1 56.0 3.4 4.6 23.6
30 33.0 33.6 58.1 60.0 3.4 4.6 26.2
36 39.0 39.6 70.1 72.0 3.4 4.6 31.5
42 45.0 45.6 81.8 84.0 4.6 7.2 36.7
48 52.0 52.7 92.8 95.0 4.6 7.2 42.0
56 62.0 62.7 104.8 107.0 6.1 8.7 49.0
64 70.0 70.7 115.8 118.0 6.1 8.7 56.0
72 78.0 78.7 127.5 130.0 6.1 8.7 63.0
80 86.0 86.9 139.5 142.0 6.1 8.7 70.0
90 96.0 96.9 156.5 159.0 6.1 8.7 78.7
100 107.0 107.9 173.5 176.0 6.1 8.7 87.5
  • (A) Nominal washer sizes are intended for use with fasteners of the same nominal thread diameter.
  • (B) Washers may be clipped on one side not closer to the center of the washer than width E.

ASTM F436M Hardened Beveled Washers (Metric Washers)

ASTM F436M Hardened Beveled Washers (Metric Washers)

Nominal Washer Size, mmA Inside Diameter (I.D.), mm Side Width (A), mm Thickness (T), mm Clipped Width (E)
min max min max min max mm,B min
12 14.0 14.4 43.0 45.0 7.5 8.5 10.5
14 16.0 16.4 43.0 45.0 7.5 8.5 12.2
16 18.0 18.4 43.0 45.0 7.5 8.5 14.0
20 22.0 22.5 43.0 45.0 7.5 8.5 17.5
22 24.0 24.5 43.0 45.0 7.5 8.5 19.2
24 26.0 26.5 43.0 45.0 7.5 8.5 21.0
27 30.0 30.5 56.0 58.0 7.5 8.5 23.6
30 33.0 33.6 56.0 58.0 7.5 8.5 26.2
36 39.0 39.6 56.0 58.0 7.5 8.5 31.5
  • (A) Nominal washer sizes are intended for use with fasteners of the same nominal thread diameter.
  • (B) Washers may be clipped on one side not closer to the center of the was than width E

ASTM F436M Washer Dimensional Tolerances (Metric Washers)

Dimensional Characteristics 12mm through 16 mm 
Nominal Size		 >16 mm 
Nominal Size
Flatness: max deviation from straightedge placed on cut side shall not exceed B B
Concentricity, in.: center of hole to outside diameter 0.6 mm FIRA 0.9 mm FIRA
Burr shall not project above immediately adjacent washer surface more than (mm) 0.25 mm 0.25 mm
  • (A) Full indicator runout.
  • (B) Flat within 0.01mm/mm of Outside Diameter

ASTM F436/F436M Bolting Surface Treatment Specifications

ASTM F436/F436M Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

Type Marking
ASTM F436/F436M Type 1 TB F436 1
ASTM F436/F436M Type 3 TB F436 3

ASTM F436/F436M Testing Standards

A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets

ASTM F436/F436M Bolting Certifications

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103

ASTM F436/F436M Supplementary Requirements

S1 Surface Roughness