Load indicating washers are used largely to develop correct tension when installing A490 or A325 structural bolts. Squirter™ DTIs and Standard DTIs are covered under the specification ASTM F959. LIWs are also available for other bolt grades.

Dimensions

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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	–	–	18996	18997
11⁄4	2.500	0.180	1.315	7	1.800	–	–	18371	17293
13⁄8	2.750	0.180	1.446	7	1.969	–	–	17294	19419
11⁄2	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
						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