Type 1

» Materials » ASTM Specifications » ASTM F436-F436M » Type 1

ASTM F436M type 1 is a standard material and dimensional specification for hardened 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 F436M type 1 hardened steel washers for use with fasteners having nominal thread diameters of M12 through M100. Boltport manufactures and stocks full range of type 1 hardened steel washers to ASTM F436M specification.


Chemical Composition [Note A]

Elements Composition, %
Type 1
Phosphorus, max Heat 0.040
Product 0.050
Sulfur, max Heat 0.050
Product 0.060

Mechanical Properties [Hardness Requirement]

Surface Quenched and Tempered Carburized
Plain 38 - 45 HRC 69 - 73 HRA
Hot Dip Galvanized 26 - 45 HRC
Mechanical Galvanized 38 - 45 HRC

Dimensions of Circular Washers

Nominal Washer
Size, mmA
Inside Diameter (A), mm Outside Diameter (B), mm Thickness (C), mm Clipped Width Clipped Width
(E), mm, minB
max min max min max min
12 14.4 14.0 27.0 25.7 4.6 3.1 10.5
14 16.4 16.0 30.0 28.7 4.6 3.1 12.2
16 18.4 18.0 34.0 32.4 4.6 3.1 14.0
20 22.5 22.0 42.0 40.4 4.6 3.1 17.5
22 24.5 24.0 44.0 42.4 4.6 3.4 19.2
24 26.5 26.0 50.0 48.4 4.6 3.4 21.0
27 30.5 30.0 56.0 54.1 4.6 3.4 23.6
30 33.6 33.0 60.0 58.1 4.6 3.4 26.2
36 39.6 39.0 72.0 70.1 4.6 3.4 31.5
42 45.6 45.0 84.0 81.8 7.2 4.6 36.7
48 52.7 52.0 95.0 92.8 7.2 4.6 42.0
56 62.7 62.0 107.0 104.8 8.7 6.1 49.0
64 70.7 70.0 118.0 115.9 8.7 6.1 56.0
72 78.7 778.0 130.0 127.5 8.7 6.1 63.0
80 86.9 86.0 142.0 139.5 8.7 6.1 70.0
90 96.9 96.0 159.0 156.5 8.7 6.1 78.7
100 107.9 107.0 176.0 173.5 8.7 6.1 87.5

Note :
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.


Washer Marking

Grade Identification Marking
Type 1 "F436M"
E-mail Whatsapp