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
Bolt Size A325 A490 A325 or A490
B Number of Protrusions C B Number of Protrusions C A PTD* Max
Max OD Thickness After Compression Max OD Thickness After Compression ID Max
1/2 1.187 4 0.120 1.375 5 0.120 0.527 0.788
5/8 1.375 4 0.140 1.625 5 0.140 0.658 0.956
3/4 1.625 5 0.140 1.750 6 0.160 0.790 1.125
7/8 1.875 5 0.160 2.000 6 0.180 0.921 1.294
1 2.000 6 0.180 2.250 7 0.180 1.052 1.463
1-1/8 2.250 6 0.180 2.500 7 0.180 1.183 1.631
1-1/4 2.500 7 0.180 2.750 8 0.180 1.315 1.800
1-3/8 2.750 7 0.180 3.000 8 0.180 1.446 1.969
1-1/2 3.000 8 0.180 3.250 9 0.180 1.577 2.138

Dimension specifications per ASTM F959. *Protrusion Tangential Diameter