Split Backup Rings | McMaster-Carr

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DFARS Specialty Metals

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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Ultra Chemical Resistant

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Number of Pieces

169 Products

About O-Rings

Find the right size, compare compatible materials, and choose the best cross section shape for your O-ring.

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	9560K15	0000000

High-Pressure Ultra-Chemical-Resistant PTFE Backup Rings


O-Ring Deforms Without a Backup Ring	O-Ring Sealing Properly with Backup Ring

Protect O-rings in equipment operating at pressures up to 4,300 psi. These backup rings support O-rings to extend their life and prevent them from deforming under pressure, which can cause pressure loss. Made of PTFE, they’re rigid enough to hold their shape under load, yet slippery enough to reduce friction in moving parts. They also resist a wide range of chemicals. Often used in pipeline valves and chemical processing equipment, they have a split ring design to simplify installation. All have a shelf life, cure date, and a traceable lot number printed on the bag.

										Pkg.
	For Dash No.	Thk.	ID	OD	Hardness	Temp. Range, ° F	Color	Pkg. Qty.		1-9	10-Up
0.053" Wide



		005	0.049"	0.124"	0.230"	Durometer 55D (Hard)	-300 to 500	White	25	9560K211	00000	00000


		006	0.049"	0.140"	0.246"	Durometer 55D (Hard)	-300 to 500	White	25	9560K212	0000	0000
		007	0.049"	0.171"	0.277"	Durometer 55D (Hard)	-300 to 500	White	25	9560K213	0000	0000
		008	0.049"	0.202"	0.308"	Durometer 55D (Hard)	-300 to 500	White	25	9560K214	0000	0000
		009	0.049"	0.234"	0.340"	Durometer 55D (Hard)	-300 to 500	White	25	9560K215	0000	0000
		010	0.049"	0.265"	0.371"	Durometer 55D (Hard)	-300 to 500	White	25	9560K216	0000	0000
		011	0.049"	0.327"	0.433"	Durometer 55D (Hard)	-300 to 500	White	25	9560K217	0000	0000
		012	0.049"	0.390"	0.496"	Durometer 55D (Hard)	-300 to 500	White	25	9560K218	0000	0000
		013	0.049"	0.455"	0.561"	Durometer 55D (Hard)	-300 to 500	White	25	9560K219	0000	0000
		014	0.049"	0.518"	0.624"	Durometer 55D (Hard)	-300 to 500	White	25	9560K221	0000	0000
		015	0.049"	0.580"	0.686"	Durometer 55D (Hard)	-300 to 500	White	25	9560K222	0000	0000


		016	0.049"	0.643"	0.749"	Durometer 55D (Hard)	-300 to 500	White	25	9560K223	0000	0000
		017	0.049"	0.705"	0.811"	Durometer 55D (Hard)	-300 to 500	White	25	9560K224	0000	0000
		018	0.049"	0.768"	0.874"	Durometer 55D (Hard)	-300 to 500	White	25	9560K225	0000	0000
		019	0.049"	0.830"	0.936"	Durometer 55D (Hard)	-300 to 500	White	25	9560K226	00000	00000
		020	0.049"	0.898"	1.004"	Durometer 55D (Hard)	-300 to 500	White	25	9560K227	00000	00000
		021	0.049"	0.960"	1.066"	Durometer 55D (Hard)	-300 to 500	White	10	9560K228	0000	0000
		022	0.049"	1.023"	1.129"	Durometer 55D (Hard)	-300 to 500	White	10	9560K229	0000	0000
		023	0.049"	1.085"	1.191"	Durometer 55D (Hard)	-300 to 500	White	10	9560K231	0000	0000
		024	0.049"	1.148"	1.254"	Durometer 55D (Hard)	-300 to 500	White	10	9560K232	00000	0000
		025	0.049"	1.210"	1.316"	Durometer 55D (Hard)	-300 to 500	White	10	9560K233	00000	00000


		026	0.049"	1.273"	1.379"	Durometer 55D (Hard)	-300 to 500	White	10	9560K234	00000	00000
		027	0.049"	1.335"	1.441"	Durometer 55D (Hard)	-300 to 500	White	10	9560K235	00000	00000
		028	0.049"	1.398"	1.504"	Durometer 55D (Hard)	-300 to 500	White	10	9560K236	00000	00000
		029	0.049"	1.523"	1.629"	Durometer 55D (Hard)	-300 to 500	White	10	9560K237	00000	00000
		030	0.049"	1.648"	1.754"	Durometer 55D (Hard)	-300 to 500	White	5	9560K238	0000	0000
		031	0.049"	1.773"	1.879"	Durometer 55D (Hard)	-300 to 500	White	5	9560K239	0000	0000
		032	0.049"	1.898"	2.004"	Durometer 55D (Hard)	-300 to 500	White	5	9560K241	0000	0000
		033	0.049"	2.023"	2.129"	Durometer 55D (Hard)	-300 to 500	White	5	9560K242	0000	0000
		034	0.049"	2.148"	2.254"	Durometer 55D (Hard)	-300 to 500	White	1	9560K243	0000	0000
		035	0.049"	2.273"	2.379"	Durometer 55D (Hard)	-300 to 500	White	1	9560K244	0000	0000


		036	0.049"	2.398"	2.504"	Durometer 55D (Hard)	-300 to 500	White	1	9560K245	0000	0000
		037	0.049"	2.523"	2.629"	Durometer 55D (Hard)	-300 to 500	White	1	9560K246	0000	0000
		038	0.049"	2.648"	2.754"	Durometer 55D (Hard)	-300 to 500	White	1	9560K247	0000	0000
		041	0.049"	3.023"	3.129"	Durometer 55D (Hard)	-300 to 500	White	1	9560K248	0000	0000
		042	0.049"	3.273"	3.379"	Durometer 55D (Hard)	-300 to 500	White	1	9560K249	0000	0000


		0.086" Wide



				109	0.049"	0.328"	0.500"	Durometer 55D (Hard)	-300 to 500	White	25	9560K251	00000	00000


				110	0.049"	0.390"	0.562"	Durometer 55D (Hard)	-300 to 500	White	25	9560K252	0000	0000
				111	0.049"	0.452"	0.624"	Durometer 55D (Hard)	-300 to 500	White	25	9560K253	0000	0000
				112	0.049"	0.515"	0.687"	Durometer 55D (Hard)	-300 to 500	White	25	9560K254	0000	0000
				113	0.049"	0.577"	0.749"	Durometer 55D (Hard)	-300 to 500	White	25	9560K255	0000	0000
				114	0.049"	0.640"	0.812"	Durometer 55D (Hard)	-300 to 500	White	25	9560K256	0000	0000
				115	0.049"	0.702"	0.874"	Durometer 55D (Hard)	-300 to 500	White	25	9560K257	0000	0000
				116	0.049"	0.765"	0.937"	Durometer 55D (Hard)	-300 to 500	White	25	9560K258	0000	0000
				117	0.049"	0.832"	1.004"	Durometer 55D (Hard)	-300 to 500	White	25	9560K49	0000	0000
118				0.049"	0.895"	1.067"	Durometer 55D (Hard)	-300 to 500	White	25	9560K261	0000	0000
119	0.049"			0.957"	1.129"	Durometer 55D (Hard)	-300 to 500	White	25	9560K21	00000	0000


120	0.049"			1.020"	1.192"	Durometer 55D (Hard)	-300 to 500	White	25	9560K22	00000	0000
121	0.049"			1.082"	1.254"	Durometer 55D (Hard)	-300 to 500	White	25	9560K23	00000	0000
122	0.049"			1.145"	1.317"	Durometer 55D (Hard)	-300 to 500	White	10	9560K265	00000	00000
123	0.049"			1.207"	1.379"	Durometer 55D (Hard)	-300 to 500	White	10	9560K266	00000	0000
124	0.049"			1.270"	1.442"	Durometer 55D (Hard)	-300 to 500	White	10	9560K267	00000	0000
125	0.049"			1.332"	1.504"	Durometer 55D (Hard)	-300 to 500	White	10	9560K268	00000	0000
126	0.049"			1.397"	1.569"	Durometer 55D (Hard)	-300 to 500	White	10	9560K269	00000	00000
127	0.049"			1.459"	1.631"	Durometer 55D (Hard)	-300 to 500	White	5	9560K271	0000	0000
128	0.049"			1.522"	1.694"	Durometer 55D (Hard)	-300 to 500	White	5	9560K272	0000	0000
129	0.049"			1.584"	1.756"	Durometer 55D (Hard)	-300 to 500	White	5	9560K273	0000	0000


130	0.049"			1.647"	1.819"	Durometer 55D (Hard)	-300 to 500	White	5	9560K274	0000	0000
131	0.049"			1.709"	1.881"	Durometer 55D (Hard)	-300 to 500	White	5	9560K275	0000	0000
132	0.049"			1.772"	1.944"	Durometer 55D (Hard)	-300 to 500	White	5	9560K276	0000	0000
133	0.049"			1.834"	2.006"	Durometer 55D (Hard)	-300 to 500	White	5	9560K277	0000	0000
134	0.049"			1.897"	2.069"	Durometer 55D (Hard)	-300 to 500	White	5	9560K278	00000	0000
135	0.049"			1.959"	2.131"	Durometer 55D (Hard)	-300 to 500	White	5	9560K279	00000	0000
136	0.049"			2.022"	2.194"	Durometer 55D (Hard)	-300 to 500	White	1	9560K281	0000	0000
137	0.049"			2.084"	2.256"	Durometer 55D (Hard)	-300 to 500	White	1	9560K282	0000	0000
138	0.049"			2.147"	2.319"	Durometer 55D (Hard)	-300 to 500	White	1	9560K283	0000	0000
139	0.049"			2.209"	2.381"	Durometer 55D (Hard)	-300 to 500	White	1	9560K284	0000	0000


140	0.049"			2.258"	2.430"	Durometer 55D (Hard)	-300 to 500	White	1	9560K285	0000	0000
141	0.049"			2.320"	2.492"	Durometer 55D (Hard)	-300 to 500	White	1	9560K286	0000	0000
142	0.049"			2.383"	2.555"	Durometer 55D (Hard)	-300 to 500	White	1	9560K287	0000	0000
143	0.049"			2.445"	2.617"	Durometer 55D (Hard)	-300 to 500	White	1	9560K288	0000	0000
144	0.049"			2.508"	2.680"	Durometer 55D (Hard)	-300 to 500	White	1	9560K289	0000	0000
145	0.049"			2.570"	2.742"	Durometer 55D (Hard)	-300 to 500	White	1	9560K291	0000	0000
146	0.049"			2.633"	2.805"	Durometer 55D (Hard)	-300 to 500	White	1	9560K292	0000	0000
147	0.049"			2.685"	2.857"	Durometer 55D (Hard)	-300 to 500	White	1	9560K293	0000	0000
148	0.049"			2.758"	2.930"	Durometer 55D (Hard)	-300 to 500	White	1	9560K294	0000	0000
150	0.049"			2.883"	3.055"	Durometer 55D (Hard)	-300 to 500	White	1	9560K295	0000	0000


151	0.049"			3.008"	3.180"	Durometer 55D (Hard)	-300 to 500	White	1	9560K296	0000	0000
152	0.049"			3.258"	3.430"	Durometer 55D (Hard)	-300 to 500	White	1	9560K297	0000	0000
158	0.049"			4.758"	4.930"	Durometer 55D (Hard)	-300 to 500	White	1	9560K298	00000	00000


0.119" Wide



				208	0.049"	0.613"	0.851"	Durometer 55D (Hard)	-300 to 500	White	10	9560K299	0000	0000


		209	0.049"	0.675"	0.913"	Durometer 55D (Hard)	-300 to 500	White	10	9560K311	0000	0000
		210	0.049"	0.766"	1.004"	Durometer 55D (Hard)	-300 to 500	White	10	9560K312	0000	0000
		211	0.049"	0.828"	1.066"	Durometer 55D (Hard)	-300 to 500	White	10	9560K313	0000	0000
		212	0.049"	0.891"	1.129"	Durometer 55D (Hard)	-300 to 500	White	10	9560K314	0000	0000
		213	0.049"	0.953"	1.191"	Durometer 55D (Hard)	-300 to 500	White	10	9560K315	0000	0000
		214	0.049"	1.016"	1.254"	Durometer 55D (Hard)	-300 to 500	White	10	9560K316	0000	0000
		215	0.049"	1.078"	1.316"	Durometer 55D (Hard)	-300 to 500	White	10	9560K317	0000	0000
		216	0.049"	1.141"	1.379"	Durometer 55D (Hard)	-300 to 500	White	10	9560K318	0000	0000
		217	0.049"	1.203"	1.441"	Durometer 55D (Hard)	-300 to 500	White	10	9560K319	0000	0000
		218	0.049"	1.266"	1.504"	Durometer 55D (Hard)	-300 to 500	White	10	9560K321	0000	0000


		219	0.049"	1.334"	1.572"	Durometer 55D (Hard)	-300 to 500	White	10	9560K322	0000	0000
		220	0.049"	1.397"	1.635"	Durometer 55D (Hard)	-300 to 500	White	10	9560K323	0000	0000
		221	0.049"	1.459"	1.697"	Durometer 55D (Hard)	-300 to 500	White	10	9560K324	0000	0000
		222	0.049"	1.522"	1.760"	Durometer 55D (Hard)	-300 to 500	White	10	9560K325	00000	0000
		223	0.049"	1.647"	1.885"	Durometer 55D (Hard)	-300 to 500	White	10	9560K326	00000	0000
		224	0.049"	1.772"	2.010"	Durometer 55D (Hard)	-300 to 500	White	10	9560K327	00000	0000
		225	0.049"	1.897"	2.135"	Durometer 55D (Hard)	-300 to 500	White	5	9560K328	00000	00000
		226	0.049"	2.022"	2.260"	Durometer 55D (Hard)	-300 to 500	White	5	9560K329	0000	0000
		227	0.049"	2.147"	2.385"	Durometer 55D (Hard)	-300 to 500	White	5	9560K331	0000	0000
		228	0.049"	2.272"	2.510"	Durometer 55D (Hard)	-300 to 500	White	5	9560K332	0000	0000


		229	0.049"	2.397"	2.635"	Durometer 55D (Hard)	-300 to 500	White	5	9560K333	0000	0000
		230	0.049"	2.522"	2.760"	Durometer 55D (Hard)	-300 to 500	White	5	9560K334	0000	0000
		231	0.049"	2.631"	2.869"	Durometer 55D (Hard)	-300 to 500	White	5	9560K335	0000	0000
		232	0.049"	2.756"	2.994"	Durometer 55D (Hard)	-300 to 500	White	1	9560K336	0000	0000
		233	0.049"	2.881"	3.119"	Durometer 55D (Hard)	-300 to 500	White	1	9560K337	0000	0000
		234	0.049"	3.006"	3.244"	Durometer 55D (Hard)	-300 to 500	White	1	9560K338	0000	0000
		235	0.049"	3.131"	3.369"	Durometer 55D (Hard)	-300 to 500	White	1	9560K339	0000	0000
		236	0.049"	3.256"	3.494"	Durometer 55D (Hard)	-300 to 500	White	1	9560K341	0000	0000
		237	0.049"	3.381"	3.619"	Durometer 55D (Hard)	-300 to 500	White	1	9560K342	0000	0000
		238	0.049"	3.506"	3.744"	Durometer 55D (Hard)	-300 to 500	White	1	9560K343	0000	0000


		239	0.049"	3.631"	3.869"	Durometer 55D (Hard)	-300 to 500	White	1	9560K344	0000	0000
		240	0.049"	3.756"	3.994"	Durometer 55D (Hard)	-300 to 500	White	1	9560K345	0000	0000
		241	0.049"	3.881"	4.119"	Durometer 55D (Hard)	-300 to 500	White	1	9560K346	0000	0000
		242	0.049"	4.006"	4.244"	Durometer 55D (Hard)	-300 to 500	White	1	9560K347	0000	0000
		243	0.049"	4.131"	4.369"	Durometer 55D (Hard)	-300 to 500	White	1	9560K348	0000	0000
		244	0.049"	4.256"	4.494"	Durometer 55D (Hard)	-300 to 500	White	1	9560K349	0000	0000
		245	0.049"	4.381"	4.619"	Durometer 55D (Hard)	-300 to 500	White	1	9560K351	0000	0000
		246	0.049"	4.506"	4.744"	Durometer 55D (Hard)	-300 to 500	White	1	9560K352	0000	0000
		247	0.049"	4.631"	4.869"	Durometer 55D (Hard)	-300 to 500	White	1	9560K353	0000	0000
		248	0.049"	4.756"	4.994"	Durometer 55D (Hard)	-300 to 500	White	1	9560K354	0000	0000


		249	0.049"	4.881"	5.119"	Durometer 55D (Hard)	-300 to 500	White	1	9560K355	0000	0000
		250	0.049"	5.006"	5.244"	Durometer 55D (Hard)	-300 to 500	White	1	9560K356	0000	0000
		252	0.049"	5.256"	5.494"	Durometer 55D (Hard)	-300 to 500	White	1	9560K357	00000	0000
		254	0.049"	5.506"	5.744"	Durometer 55D (Hard)	-300 to 500	White	1	9560K358	00000	0000
		255	0.049"	5.631"	5.869"	Durometer 55D (Hard)	-300 to 500	White	1	9560K359	00000	00000
		256	0.049"	5.756"	5.994"	Durometer 55D (Hard)	-300 to 500	White	1	9560K361	00000	00000
		257	0.049"	5.881"	6.119"	Durometer 55D (Hard)	-300 to 500	White	1	9560K362	00000	00000
		258	0.049"	6.006"	6.244"	Durometer 55D (Hard)	-300 to 500	White	1	9560K363	00000	0000
		259	0.049"	6.256"	6.494"	Durometer 55D (Hard)	-300 to 500	White	1	9560K364	00000	00000
		260	0.049"	6.506"	6.744"	Durometer 55D (Hard)	-300 to 500	White	1	9560K365	00000	00000

261	0.049"	6.758"	6.996"	Durometer 55D (Hard)	-300 to 500	White	1	9560K366	00000	00000
263	0.049"	7.258"	7.496"	Durometer 55D (Hard)	-300 to 500	White	1	9560K367	00000	00000
264	0.049"	7.508"	7.746"	Durometer 55D (Hard)	-300 to 500	White	1	9560K368	00000	00000
265	0.049"	7.758"	7.996"	Durometer 55D (Hard)	-300 to 500	White	1	9560K369	00000	00000

0.183" Wide



		325	0.07"	1.513"	1.879"	Durometer 55D (Hard)	-300 to 500	White	5	9560K371	0000	0000


		326	0.07"	1.638"	2.004"	Durometer 55D (Hard)	-300 to 500	White	5	9560K372	0000	0000
		327	0.07"	1.763"	2.129"	Durometer 55D (Hard)	-300 to 500	White	5	9560K373	0000	0000
		328	0.07"	1.888"	2.254"	Durometer 55D (Hard)	-300 to 500	White	5	9560K374	0000	0000
		329	0.07"	2.013"	2.379"	Durometer 55D (Hard)	-300 to 500	White	5	9560K375	0000	0000
		330	0.07"	2.138"	2.504"	Durometer 55D (Hard)	-300 to 500	White	5	9560K376	0000	0000
		331	0.07"	2.268"	2.634"	Durometer 55D (Hard)	-300 to 500	White	5	9560K377	0000	0000
		332	0.07"	2.393"	2.759"	Durometer 55D (Hard)	-300 to 500	White	5	9560K378	00000	0000
		333	0.07"	2.518"	2.884"	Durometer 55D (Hard)	-300 to 500	White	5	9560K379	00000	0000
		334	0.07"	2.643"	3.009"	Durometer 55D (Hard)	-300 to 500	White	1	9560K381	0000	0000
		335	0.07"	2.768"	3.134"	Durometer 55D (Hard)	-300 to 500	White	1	9560K382	0000	0000


		336	0.07"	2.893"	3.259"	Durometer 55D (Hard)	-300 to 500	White	1	9560K383	0000	0000
		337	0.07"	3.018"	3.384"	Durometer 55D (Hard)	-300 to 500	White	1	9560K384	0000	0000
		338	0.07"	3.143"	3.509"	Durometer 55D (Hard)	-300 to 500	White	1	9560K385	0000	0000
		339	0.07"	3.273"	3.639"	Durometer 55D (Hard)	-300 to 500	White	1	9560K386	0000	0000
		340	0.07"	3.398"	3.764"	Durometer 55D (Hard)	-300 to 500	White	1	9560K387	0000	0000
		341	0.07"	3.523"	3.889"	Durometer 55D (Hard)	-300 to 500	White	1	9560K388	0000	0000
		342	0.07"	3.648"	4.014"	Durometer 55D (Hard)	-300 to 500	White	1	9560K389	0000	0000
		343	0.07"	3.773"	4.139"	Durometer 55D (Hard)	-300 to 500	White	1	9560K391	0000	0000
		344	0.07"	3.898"	4.264"	Durometer 55D (Hard)	-300 to 500	White	1	9560K392	0000	0000
		345	0.07"	4.028"	4.394"	Durometer 55D (Hard)	-300 to 500	White	1	9560K393	0000	0000


		346	0.07"	4.153"	4.519"	Durometer 55D (Hard)	-300 to 500	White	1	9560K394	0000	0000
		347	0.07"	4.278"	4.644"	Durometer 55D (Hard)	-300 to 500	White	1	9560K395	0000	0000
		348	0.07"	4.403"	4.769"	Durometer 55D (Hard)	-300 to 500	White	1	9560K396	0000	0000
		349	0.07"	4.528"	4.894"	Durometer 55D (Hard)	-300 to 500	White	1	9560K397	0000	0000
		358	0.07"	5.653"	6.019"	Durometer 55D (Hard)	-300 to 500	White	1	9560K398	00000	00000


		0.236" Wide



				426	0.105"	4.676"	5.148"	Durometer 55D (Hard)	-300 to 500	White	1	9560K399	00000	00000


				429	0.105"	5.051"	5.523"	Durometer 55D (Hard)	-300 to 500	White	1	9560K412	00000	00000
				433	0.105"	5.551"	6.023"	Durometer 55D (Hard)	-300 to 500	White	1	9560K413	00000	00000
				439	0.105"	6.524"	6.996"	Durometer 55D (Hard)	-300 to 500	White	1	9560K414	00000	00000
				443	0.105"	7.524"	7.996"	Durometer 55D (Hard)	-300 to 500	White	1	9560K415	00000	00000
				446	0.105"	8.524"	8.996"	Durometer 55D (Hard)	-300 to 500	White	1	9560K416	00000	00000
				452	0.105"	11.524"	11.996"	Durometer 55D (Hard)	-300 to 500	White	1	9560K417	00000	00000