Malleable cast iron round washers are used in dock and wood construction. These oversized washers have a large bearing surface designed to prevent bolt heads and nuts from pulling into the wood.

Stock

Diameters: 3/8″ – 1″
Origin: Domestic (no keyhole) and Import (keyhole)
Finish: Black and hot-dip galvanized

Dimensions

Click table to show drawingMalleable Iron Washer
Bolt Size A T Weight In Pounds Per 100 Pieces
Outside Diameter Thickness Gauge
3/8 2-1/2 1/4 18
1/2 2-1/2 1/4 22
5/8 2-3/4 5/16 32
3/4 3 7/16 42
7/8 3-1/2 7/16 55
1 3-3/4 1/2 63
1-1/8 4-1/2 1/2 96
1-1/4 5 9/16 121
1-1/2 6 3/4 187
Reference ASTM A47 for general casting information.

Slight variations in thickness and outside diameter dimensions may exist from one lot of washers to another. If these dimensions are critical, ask your Portland Bolt sales representative to check the dimensions of current inventory prior to ordering.

Stock Malleable Iron Washers

Round Malleable Washer Size Imported Domestic
Plain Finish  Part# Hot Dip Galvanized Part# Plain Finish Part# Hot Dip Galvanized Part#
 1/2 11984
 5/8 11985 11986 19731
 3/4 11987 11988 19732 19733
 7/8 11990 19735
1 11992 19737
* Other sizes available upon request