Specifications – Dimensions & Approximate Weights based on mean dimensions in mfg.

United States Standard (USS) Flat Washers are used in most industrial applications. They are also designated as Type A Plain Washers, wide series. They were developed for use with coarse thread nuts and bolts.

		USS	Flat	Washers
		Dimensions		Weights	& Counts
Bolt				Wt. Per	No./Pcs.	1/4 Keg
Size	I.D.	O.D.	Thick	M Pcs.	Per Lb.	Quantity
3/16"	1/4"	9/16"	3/64"	2.8#	361	18,050
1/4"	5/16"	3/4"	1/16"	6.7#	149	7,450
5/16"	3/8"	7/8"	5/64"	11.5#	87	4,350
3/8"	7/16"	1"	5/64"	14.9#	67	3,350
7/16"	1/2"	1-1/4"	5/64"	24.4#	41	2,050
1/2"	9/16"	1-3/8"	7/64"	38.5#	26	1,300
9/16"	5/8"	1-1/2"	7/64"	45.5#	22	1,100
5/8"	11/16"	1-3/4"	9/64"	77.0#	13	650
3/4"	13/16"	2"	5/32"	110.0#	9.1	455
7/8"	15/16"	2-1/4"	11/64"	153.0#	6.5	325
1"	1-1/16"	2-1/2"	11/64"	188.0#	5.3	265
1-1/8"	1-1/4"	2-3/4"	11/64"	220.0#	4.5	225
1-1/4"	1-3/8"	3"	11/64"	260.0#	3.8	190
1-3/8"	1-1/2"	3-1/4"	3/16"	333.0#	3	150
1-1/2"	1-5/8"	3-1/2"	3/16"	385.0#	2.6	130
1-5/8"	1-3/4"	3-3/4"	3/16"	448.0#	2.3	115
1-3/4"	1-7/8"	4"	3/16"	500.0#	2	100
1-7/8"	2"	4-1/4"	3/16"	569.0#	1.8	88
2"	2-1/8"	4-1/2"	3/16"	630.0#	1.6	79
2-1/4"	2-3/8"	4-3/4"	7/32"	826.0#	1.2	60
2-1/2"	2-5/8"	5"	15/64"	961.0#	1	52
2-3/4"	2-7/8"	5-1/4"	1/4"	1100.0#	0.9	45
3"	3-1/8"	5-1/2"	9/32"	1300.0#	0.8	39

* 316” size is also #10 size.

Bolt	Plain	Finish		Zinc	Plated		Bolt
Size	1# Box	5# Box	Bulk 50#	1# Box	5# Box	Bulk 50#	Size
3/16"							3/16"
1/4"							1/4"
5/16"							5/16"
3/8"							3/8"
7/16"							7/16"
1/2"							1/2"
9/16"							9/16"
5/8"							5/8"
3/4"							3/4"
7/8"							7/8"
1"							1"
1-1/8"							1-1/8"
1-1/4"							1-1/4"
1-3/8"							1-3/8"
1-1/2"							1-1/2"
1-5/8"	-	-		-	-		1-5/8"
1-3/4"	-	-		-	-		1-3/4"
1-7/8"	-	-		-	-		1-7/8"
2"	-	-		-	-		2"
2-1/4"	-	-		-	-		2-1/4"
2-1/2"	-	-		-	-		2-1/2"
2-3/4"	-	-		-	-		2-3/4"
3"	-	-		-	-		3"

U.S. Standard Low Carbon Steel Galvanized Flat Washers