• Scope
• Chemical Composition
• Mechanical Properties
• Dimensions
• Washer Marking

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"