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. Load indicating washers may be available for other bolt grades as well.

Stock

Diameters: 1/2″ – 1-1/2″
Origin: Domestic
Finish: Plain and mechanically galvanized
Item: Load indicating washers for A325 only

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
Plain Galvanized Plain Galvanized
1⁄2 1.187 0.120 0.527 4 0.788 12621 12622 16485 17287
5⁄8 1.375 0.140 0.658 4 0.956 12623 12624 15909 17288
3⁄4 1.625 0.140 0.790 5 1.125 12625 12626 12678 17289
7⁄8 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
11⁄8 2.250 0.180 1.183 6 1.631 17296 17297 18996 18997
11⁄4 2.500 0.180 1.315 7 1.800 18371 17299 17298 17293
13⁄8 2.750 0.180 1.446 7 1.969 17300 19419 17294 17301
11⁄2 3.000 0.180 1.577 8 2.138 17302 17303 18408 19418
A490
Bolt Size B C A Number of Protrusions PTD* Max Part Numbers
Max OD Thickness After Compression ID Max Squirter ® Standard
Plain Galvanized Plain Galvanized
1⁄2 1.375 0.120 0.527 5 0.788 - - - -
5⁄8 1.625 0.140 0.658 5 0.956 - - - -
3⁄4 1.750 0.160 0.790 6 1.125 - - - -
7⁄8 2.000 0.180 0.921 6 1.294 - - - -
1 2.250 0.180 1.052 7 1.463 - - - -
11⁄8 2.500 0.180 1.183 7 1.631 - - - -
11⁄4 2.750 0.180 1.315 8 1.800 - - - -
13⁄8 3.000 0.180 1.446 8 1.969 - - - -
11⁄2 3.250 0.180 1.577 9 2.138 - - - -

Dimension specifications per ASTM F959.
*Protrusion Tangential Diameter