Load indicating washers (LIW) are used to develop the correct tension when installing A325 or A490 structural bolts. Standard DTIs and Squirter™ DTIs are made to ASTM F959.

Stock

Diameters: 1/2″ – 1-1/2″
Origin: Domestic
Finish: Black and mechanically galvanized

Dimensions

Click table to show drawingLoad Indicating Washer Drawing
A325
Bolt Size B C A Number of Protrusions PTD* Max Part Numbers
Max OD Thickness After Compression ID Max Squirter Standard
Black Galvanized Black Galvanized
12 1.187 0.120 0.527 4 0.788 12621 12622 16485 17287
58 1.375 0.140 0.658 4 0.956 12623 12624 15909 17288
34 1.625 0.140 0.790 5 1.125 12625 12626 12678 17289
78 1.875 0.160 0.921 5 1.294 12627 12628 12645 17290
1 2.000 0.180 1.052 6 1.463 12629 12630 12646 17291
118 2.250 0.180 1.183 6 1.631 - - 18996 18997
114 2.500 0.180 1.315 7 1.800 - - 18371 17293
138 2.750 0.180 1.446 7 1.969 - - 17294 19419
112 3.000 0.180 1.577 8 2.138 18408 - - 19418
A490
Bolt Size B C A Number of Protrusions PTD* Max Part Numbers
Max OD Thickness After Compression ID Max Squirter Standard
Black Galvanized Black Galvanized
12 1.375 5 0.120 0.527 0.788 - - - -
58 1.625 5 0.140 0.658 0.956 - - - -
34 1.750 6 0.160 0.790 1.125 - - - -
78 2.000 6 0.180 0.921 1.294 - - - -
1 2.250 7 0.180 1.052 1.463 - - - -
118 2.500 7 0.180 1.183 1.631 - - - -
114 2.750 8 0.180 1.315 1.800 - - - -
138 3.000 8 0.180 1.446 1.969 - - - -
112 3.250 9 0.180 1.577 2.138 - - - -

Dimension specifications per ASTM F959.
*Protrusion Tangential Diameter