Backup Washers | McMaster-Carr

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284 Products

Washers for Blind Rivets

Stop blind rivets from pulling through large holes or soft material, such as plastic. Also known as backup washers.

Stainless Steel About Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these washers resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	ID	OD	Thk.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	3/32"	0.098"	0.312"	0.058" to 0.068"	50	000000000	000000


	1/8"	0.134"	0.375"	0.057" to 0.067"	100	000000000	0000
	5/32"	0.161"	0.438"	0.058" to 0.068"	50	000000000	00000
	3/16"	0.192"	0.375"	0.058" to 0.068"	50	000000000	00000
	3/16"	0.197"	0.500"	0.057" to 0.067"	100	000000000	00000
	1/4"	0.256"	0.500"	0.058" to 0.068"	50	000000000	00000

Steel

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

	ID	OD	Thk.	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	3/32"	0.098"	0.312"	0.058" to 0.068"	100	000000000	000000


	1/8"	0.134"	0.375"	0.057" to 0.067"	500	000000000	00000
	5/32"	0.165"	0.438"	0.057" to 0.067"	250	000000000	0000
	3/16"	0.192"	0.375"	0.055" to 0.065"	250	000000000	0000
	3/16"	0.197"	0.500"	0.057" to 0.067"	250	000000000	00000
	1/4"	0.256"	0.500"	0.056" to 0.062"	250	000000000	00000

Aluminum

One-third the weight of steel, these washers are commonly used in robotics, automation, and other applications that have weight limits. They're an alternative to stainless steel for rust resistance, but aren't as strong.

	ID	OD	Thk.	Pkg. Qty.		Pkg.
Aluminum



	3/32"	0.098"	0.312"	0.058" to 0.068"	100	000000000	000000


	1/8"	0.134"	0.375"	0.057" to 0.067"	500	000000000	00000
	5/32"	0.165"	0.438"	0.057" to 0.067"	250	000000000	00000
	3/16"	0.192"	0.375"	0.055" to 0.065"	250	000000000	00000
	3/16"	0.197"	0.500"	0.057" to 0.067"	250	000000000	00000
	1/4"	0.256"	0.500"	0.056" to 0.062"	100	000000000	00000

Oil-Resistant Buna-N Backup Rings

Made of Buna-N, these backup rings resist grease, petroleum fluids, and motor oil. Use them to extend the life of your O-rings and improve their performance in high-pressure applications.

	For Dash No.	Thk.	ID	OD	Hardness	Temp. Range, ° F	Color	Pkg. Qty.		Pkg.
0.053" Wide



		004	0.049"	0.096"	0.202"	Durometer 90A (Hard)	-40 to 250	Black	100	0000000	00000


		005	0.049"	0.127"	0.233"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		006	0.049"	0.140"	0.246"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		007	0.049"	0.171"	0.277"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		008	0.049"	0.202"	0.308"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		009	0.049"	0.234"	0.340"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		010	0.049"	0.265"	0.371"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		011	0.049"	0.327"	0.433"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		012	0.049"	0.390"	0.496"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		013	0.049"	0.455"	0.561"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		014	0.049"	0.518"	0.624"	Durometer 90A (Hard)	-40 to 250	Black	100	0000000	0000


		015	0.049"	0.580"	0.686"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		016	0.049"	0.643"	0.749"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		017	0.049"	0.705"	0.811"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		018	0.049"	0.768"	0.874"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		019	0.049"	0.830"	0.936"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		020	0.049"	0.893"	0.999"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		021	0.049"	0.955"	1.061"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		022	0.049"	1.018"	1.124"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		024	0.049"	1.143"	1.249"	Durometer 90A (Hard)	-40 to 250	Black	100	0000000	0000
		025	0.049"	1.205"	1.311"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000


		026	0.049"	1.268"	1.374"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		028	0.049"	1.393"	1.499"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		029	0.049"	1.518"	1.624"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
		031	0.049"	1.768"	1.874"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	00000
		042	0.049"	3.268"	3.374"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000


		0.086" Wide



				103	0.053"	0.109"	0.281"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000


				109	0.053"	0.327"	0.499"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				110	0.053"	0.390"	0.562"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				111	0.053"	0.452"	0.624"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				112	0.053"	0.515"	0.687"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				113	0.053"	0.577"	0.749"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				114	0.053"	0.640"	0.812"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				115	0.053"	0.702"	0.874"	Durometer 90A (Hard)	-40 to 250	Black	100	0000000	0000
				116	0.053"	0.765"	0.937"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				117	0.053"	0.831"	1.003"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				118	0.053"	0.893"	1.065"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000


				119	0.053"	0.956"	1.128"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				120	0.053"	1.018"	1.190"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				121	0.053"	1.081"	1.253"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				124	0.053"	1.268"	1.440"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				125	0.053"	1.331"	1.503"	Durometer 90A (Hard)	-40 to 250	Black	100	0000000	0000
				126	0.053"	1.393"	1.565"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	00000
				128	0.053"	1.518"	1.690"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	00000
				130	0.053"	1.643"	1.815"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	00000
131				0.053"	1.706"	1.878"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	00000
132	0.053"			1.768"	1.940"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	00000


134	0.053"			1.893"	2.065"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	00000
135	0.053"			1.956"	2.128"	Durometer 90A (Hard)	-40 to 250	Black	100	0000000	00000
136	0.053"			2.018"	2.190"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000
137	0.053"			2.081"	2.253"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000
141	0.053"			2.331"	2.503"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000
152	0.053"			3.268"	3.440"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	0000
154	0.053"			3.768"	3.940"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000
155	0.053"			4.018"	4.190"	Durometer 90A (Hard)	-40 to 250	Black	10	0000000	0000
158	0.053"			4.768"	4.940"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000


0.118" Wide



				202	0.05"	0.265"	0.501"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000


				203	0.05"	0.327"	0.563"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				204	0.05"	0.390"	0.626"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				206	0.05"	0.518"	0.754"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				207	0.05"	0.580"	0.816"	Durometer 90A (Hard)	-40 to 250	Black	100	0000000	0000
				208	0.05"	0.643"	0.879"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				210	0.05"	0.766"	1.002"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				211	0.05"	0.828"	1.064"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				212	0.05"	0.891"	1.127"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				214	0.05"	1.016"	1.252"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000
				216	0.05"	1.141"	1.377"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	0000


				217	0.05"	1.203"	1.439"	Durometer 90A (Hard)	-40 to 250	Black	100	0000000	0000
				218	0.05"	1.266"	1.502"	Durometer 90A (Hard)	-40 to 250	Black	100	00000000	00000
				220	0.05"	1.397"	1.633"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000
				222	0.05"	1.522"	1.758"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000
				223	0.05"	1.647"	1.833"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000
		224		0.05"	1.772"	2.008"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000
		225	0.05"	1.897"	2.133"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000
		226	0.05"	2.022"	2.258"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000
		227	0.05"	2.147"	2.383"	Durometer 90A (Hard)	-40 to 250	Black	50	0000000	00000
		228	0.05"	2.272"	2.508"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000


		229	0.05"	2.397"	2.633"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000
		230	0.05"	2.522"	2.758"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000
		231	0.05"	2.631"	2.867"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000
		232	0.05"	2.756"	2.992"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000
		233	0.05"	2.881"	3.117"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	0000
		234	0.05"	3.006"	3.242"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	0000
		235	0.05"	3.131"	3.367"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		236	0.05"	3.256"	3.492"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		237	0.05"	3.381"	3.617"	Durometer 90A (Hard)	-40 to 250	Black	25	0000000	0000
		238	0.05"	3.506"	3.742"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000


		239	0.05"	3.631"	3.867"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		240	0.05"	3.756"	3.992"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		241	0.05"	3.881"	4.117"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		242	0.05"	4.006"	4.242"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		243	0.05"	4.131"	4.367"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		244	0.05"	4.256"	4.492"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		245	0.05"	4.381"	4.617"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		246	0.05"	4.506"	4.742"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		247	0.05"	4.631"	4.867"	Durometer 90A (Hard)	-40 to 250	Black	25	0000000	00000
		248	0.05"	4.768"	5.004"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000


		249	0.05"	4.893"	5.129"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		250	0.05"	5.018"	5.254"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000
		252	0.05"	5.268"	5.504"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000
		254	0.05"	5.518"	5.754"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000
		255	0.05"	5.643"	5.879"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000
		256	0.05"	5.768"	6.004"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000
		257	0.05"	5.893"	6.129"	Durometer 90A (Hard)	-40 to 250	Black	10	0000000	0000
		258	0.05"	6.018"	6.254"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000
		259	0.05"	6.268"	6.504"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000
		260	0.05"	6.518"	6.754"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000

261	0.05"	6.768"	7.004"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000
262	0.05"	7.018"	7.254"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000
265	0.05"	7.768"	8.004"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000

0.183" Wide



		322	0.076"	1.263"	1.629"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000


		323	0.076"	1.316"	1.682"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000
		325	0.076"	1.513"	1.879"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	0000
		326	0.076"	1.638"	2.004"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000
		329	0.076"	2.013"	2.379"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000
		330	0.076"	2.138"	2.504"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000
		333	0.076"	2.518"	2.884"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000
		334	0.076"	2.643"	3.009"	Durometer 90A (Hard)	-40 to 250	Black	50	00000000	00000
		337	0.076"	3.018"	3.384"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		338	0.076"	3.143"	3.509"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		339	0.076"	3.273"	3.639"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000


		340	0.076"	3.398"	3.764"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		341	0.076"	3.523"	3.889"	Durometer 90A (Hard)	-40 to 250	Black	25	0000000	00000
		342	0.076"	3.648"	4.014"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		343	0.076"	3.773"	4.139"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		344	0.076"	3.898"	4.264"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		345	0.076"	4.028"	4.394"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		346	0.076"	4.153"	4.519"	Durometer 90A (Hard)	-40 to 250	Black	25	00000000	00000
		349	0.076"	4.528"	4.894"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	0000
		351	0.076"	4.778"	5.144"	Durometer 90A (Hard)	-40 to 250	Black	10	0000000	0000
		358	0.076"	5.653"	6.019"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000


		0.236" Wide



				426	0.117"	4.676"	5.148"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000


				427	0.117"	4.801"	5.273"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000
				429	0.117"	5.051"	5.523"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000
				433	0.117"	5.551"	6.023"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000
				437	0.117"	6.051"	6.523"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000
				439	0.117"	6.524"	6.996"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000
				443	0.117"	7.524"	7.996"	Durometer 90A (Hard)	-40 to 250	Black	10	00000000	00000
				446	0.117"	8.524"	8.996"	Durometer 90A (Hard)	-40 to 250	Black	5	00000000	00000
				451	0.117"	11.024"	11.496"	Durometer 90A (Hard)	-40 to 250	Black	5	00000000	00000
				452	0.117"	11.524"	11.996"	Durometer 90A (Hard)	-40 to 250	Black	5	00000000	00000

Ultra-Chemical-Resistant PTFE Backup Rings

These PTFE backup rings resist harsh chemicals, such as acetone, fluorinated solvents, methanol, and many acids. Use them to extend the life of your O-rings and improve their performance in high-pressure applications.

	For Dash No.	Thk.	ID	OD	Hardness	Temp. Range, ° F	Color	Pkg. Qty.		Pkg.
0.053" Wide



		005	0.049"	0.124"	0.230"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	000000


		006	0.049"	0.140"	0.246"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		007	0.049"	0.171"	0.277"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		008	0.049"	0.202"	0.308"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		009	0.049"	0.234"	0.340"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		010	0.049"	0.265"	0.371"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		011	0.049"	0.327"	0.433"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		012	0.049"	0.390"	0.496"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		013	0.049"	0.455"	0.561"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		014	0.049"	0.518"	0.624"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		015	0.049"	0.580"	0.686"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000


		016	0.049"	0.643"	0.749"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		017	0.049"	0.705"	0.811"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		018	0.049"	0.768"	0.874"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
		019	0.049"	0.801"	0.907"	Durometer 55D (Hard)	-300 to 500	White	50	00000000	00000
		020	0.049"	0.864"	0.970"	Durometer 55D (Hard)	-300 to 500	White	50	00000000	00000
		021	0.049"	0.926"	1.032"	Durometer 55D (Hard)	-300 to 500	White	50	00000000	00000
		022	0.049"	0.989"	1.095"	Durometer 55D (Hard)	-300 to 500	White	50	00000000	00000
		024	0.049"	1.114"	1.220"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
		025	0.049"	1.176"	1.282"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
		026	0.049"	1.239"	1.345"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000


		028	0.049"	1.364"	1.470"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
		029	0.049"	1.489"	1.595"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
		031	0.049"	1.739"	1.845"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000


		0.086" Wide



				109	0.049"	0.299"	0.471"	Durometer 55D (Hard)	-300 to 500	White	50	00000000	00000


				110	0.049"	0.390"	0.562"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				111	0.049"	0.452"	0.624"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				112	0.049"	0.515"	0.687"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				113	0.049"	0.577"	0.749"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				114	0.049"	0.640"	0.812"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				115	0.049"	0.702"	0.874"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				116	0.049"	0.765"	0.937"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				117	0.049"	0.832"	1.004"	Durometer 55D (Hard)	-300 to 500	White	25	0000000	00000
				118	0.049"	0.895"	1.067"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				119	0.049"	0.957"	1.129"	Durometer 55D (Hard)	-300 to 500	White	25	0000000	00000


				120	0.049"	1.020"	1.192"	Durometer 55D (Hard)	-300 to 500	White	25	0000000	00000
				121	0.049"	1.082"	1.254"	Durometer 55D (Hard)	-300 to 500	White	25	0000000	00000
				124	0.049"	1.237"	1.409"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
				125	0.049"	1.299"	1.471"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
				126	0.049"	1.362"	1.534"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
				128	0.049"	1.487"	1.659"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
				130	0.049"	1.612"	1.784"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000
				133	0.049"	1.834"	2.006"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000
				134	0.049"	1.862"	2.034"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000
				137	0.049"	2.050"	2.222"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000


141	0.049"			2.300"	2.472"	Durometer 55D (Hard)	-300 to 500	White	5	0000000	00000
152	0.049"			3.237"	3.409"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
158	0.049"			4.737"	4.909"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000


0.119" Wide



				208	0.049"	0.609"	0.847"	Durometer 55D (Hard)	-300 to 500	White	50	00000000	00000


				210	0.049"	0.766"	1.004"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				211	0.049"	0.828"	1.066"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				212	0.049"	0.891"	1.129"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				213	0.049"	0.953"	1.191"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				214	0.049"	1.016"	1.254"	Durometer 55D (Hard)	-300 to 500	White	50	0000000	00000
				215	0.049"	1.078"	1.316"	Durometer 55D (Hard)	-300 to 500	White	25	0000000	00000
				216	0.049"	1.141"	1.379"	Durometer 55D (Hard)	-300 to 500	White	25	0000000	00000
				217	0.049"	1.203"	1.441"	Durometer 55D (Hard)	-300 to 500	White	25	0000000	00000
				218	0.049"	1.266"	1.504"	Durometer 55D (Hard)	-300 to 500	White	25	0000000	00000
				219	0.049"	1.334"	1.572"	Durometer 55D (Hard)	-300 to 500	White	25	0000000	00000


				220	0.049"	1.359"	1.597"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
				222	0.049"	1.522"	1.760"	Durometer 55D (Hard)	-300 to 500	White	25	0000000	00000
				223	0.049"	1.609"	1.847"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
				224	0.049"	1.734"	1.972"	Durometer 55D (Hard)	-300 to 500	White	25	00000000	00000
				225	0.049"	1.859"	2.097"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000
				226	0.049"	1.984"	2.222"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000
				227	0.049"	2.109"	2.347"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000
				228	0.049"	2.234"	2.472"	Durometer 55D (Hard)	-300 to 500	White	10	0000000	00000
				229	0.049"	2.359"	2.597"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000
				230	0.049"	2.484"	2.722"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000


		231	0.049"	2.609"	2.847"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000
		232	0.049"	2.734"	2.972"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		233	0.049"	2.859"	3.097"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		234	0.049"	2.984"	3.222"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		235	0.049"	3.109"	3.347"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		236	0.049"	3.234"	3.472"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		237	0.049"	3.359"	3.597"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		238	0.049"	3.484"	3.722"	Durometer 55D (Hard)	-300 to 500	White	5	0000000	00000
		239	0.049"	3.609"	3.847"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		240	0.049"	3.734"	3.972"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000


		241	0.049"	3.859"	4.097"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		242	0.049"	3.984"	4.222"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		243	0.049"	4.109"	4.347"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		244	0.049"	4.234"	4.472"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		245	0.049"	4.359"	4.597"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		246	0.049"	4.484"	4.722"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		248	0.049"	4.734"	4.972"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		249	0.049"	4.859"	5.097"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	0000
		250	0.049"	4.984"	5.222"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	0000
		252	0.049"	5.234"	5.472"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000


		254	0.049"	5.484"	5.722"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	0000
		255	0.049"	5.609"	5.847"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000
		256	0.049"	5.734"	5.972"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000
		257	0.049"	5.859"	6.097"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000
		258	0.049"	5.984"	6.222"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	0000
		261	0.049"	6.734"	6.972"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000
		265	0.049"	7.734"	7.972"	Durometer 55D (Hard)	-300 to 500	White	1	0000000	00000


		0.183" Wide



		325	0.07"	1.475"	1.841"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000


		326	0.07"	1.600"	1.966"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000
		328	0.07"	1.888"	2.254"	Durometer 55D (Hard)	-300 to 500	White	10	0000000	00000
		329	0.07"	2.013"	2.379"	Durometer 55D (Hard)	-300 to 500	White	10	0000000	00000
		330	0.07"	2.138"	2.504"	Durometer 55D (Hard)	-300 to 500	White	10	0000000	00000
		333	0.07"	2.475"	2.841"	Durometer 55D (Hard)	-300 to 500	White	10	00000000	00000
		334	0.07"	2.600"	2.966"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		337	0.07"	2.975"	3.341"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		338	0.07"	3.100"	3.466"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		339	0.07"	3.225"	3.591"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		340	0.07"	3.350"	3.716"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000


		341	0.07"	3.475"	3.841"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		342	0.07"	3.600"	3.966"	Durometer 55D (Hard)	-300 to 500	White	5	0000000	00000
		344	0.07"	3.850"	4.216"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		345	0.07"	3.975"	4.341"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		346	0.07"	4.100"	4.466"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		349	0.07"	4.475"	4.841"	Durometer 55D (Hard)	-300 to 500	White	5	00000000	00000
		358	0.07"	5.600"	5.966"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000


		0.236" Wide



				426	0.108"	4.600"	5.072"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000


				429	0.108"	4.975"	5.447"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000
				433	0.108"	5.475"	5.947"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000
				439	0.108"	6.475"	6.947"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000
				443	0.108"	7.475"	7.947"	Durometer 55D (Hard)	-300 to 500	White	1	0000000	00000
				446	0.108"	8.475"	8.947"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000
				452	0.108"	11.475"	11.947"	Durometer 55D (Hard)	-300 to 500	White	1	00000000	00000

Square Washers for Blind Rivets

Fit these washers into slots and channels to prevent blind rivets from pulling through large holes or soft materials. They are wider than most round washers to distribute heavier loads across a larger surface area.

Steel

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

	ID	Wd.	Thk.	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	3/32"	0.098"	0.500"	0.056" to 0.062"	500	000000000	000000


	1/8"	0.129"	0.500"	0.056" to 0.062"	500	000000000	00000
	3/16"	0.192"	0.500"	0.056" to 0.062"	500	000000000	00000

PTFE Backup Ring Assortments

These 325-piece assortments mean you’ll always have a backup ring on hand. Use them to extend the life of your O-rings and improve their performance in high-pressure applications. The backup rings are made of PTFE and resist harsh chemicals such as, acetone, fluorinated solvents, methanol, and many acids.

No. of Sizes	Includes	Hardness	Temp. Range, ° F	Color		Each



325	36	Dash Numbers 005-018, 110-121, 210-219	Durometer 55D (Hard)	-100 to 500	White	0000000	0000000