Strain Relief Springs | McMaster-Carr

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Load

Extended Length @ Maximum Load

Wire Diameter

Material

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

Yes

REACH

Compliant

RoHS

Compliant

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

EAR99

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32 Products

Overload-Prevention Extension Springs

Stop overstretching before it starts—drawbars limit how far these springs extend to prevent breaking. They’re best for tensioning tasks, such as pulling and keeping fences and gates closed.

Loop End—The most secure attachment method. With fully closed loops, there's no risk of slipping off.

Spring Steel—Strong and resilient, but best suited for dry environments since moisture will cause these springs to rust.

Corrosion-Resistant 302 Stainless Steel—Won’t corrode from exposure to moisture and mild chemicals, including ammonia often found in cleaning solutions. These springs are easier to extend than steel, but can’t handle as high a load.

Minimum Load—The amount of force required to start extending the spring.

Maximum Load—The amount of force required to fully extend the spring.

					Load
	Lg.	OD	Wire Dia.	Extended Lg. @ Max. Load	Min.	Max., lb.	Spring Rate, lbf/in		Each
Loop End







				Spring Steel

				3.904"	0.675"	0.048"	6.104"	Not Rated	5.01	2.28	9630K6	00000


				5.75"	1.1"	1/8"	7.65"	Not Rated	55.1	29	9630K4	00000
				5.816"	1.192"	0.092"	8.816"	Not Rated	12.62	4.21	9630K5	00000
				5.856"	1.162"	0.072"	9.856"	Not Rated	11.1	2.77	9630K8	00000
				7"	1.125"	0.112"	8.9"	Not Rated	95	50	9630K91	00000
				7.29"	0.875"	0.105"	9.64"	Not Rated	42.3	18	9630K1	00000
				7.375"	2.1"	1/4"	10.125"	Not Rated	180.65	65.69	9630K7	00000
				7.376"	2.1"	0.312"	9.226"	Not Rated	332.72	179.85	9630K9	00000
				7.5"	1.375"	0.148"	9.6"	Not Rated	160	75	9630K93	00000
				8"	1.875"	1/4"	9.85"	Not Rated	222	109.6	9630K3	00000
				8.204"	1.746"	0.148"	12.204"	Not Rated	54.08	13.52	9630K14	00000


				8.336"	1.375"	0.207"	9.536"	Not Rated	174	145	9630K2	00000
				13.126"	2.462"	0.312"	16.526"	Not Rated	313.81	92.3	9630K33	00000
				13.25"	1.625"	1/4"	14.9"	Not Rated	247.5	150	9630K31	00000
				15.73"	1.87"	0.135"	20.73"	Not Rated	38.09	7.62	9630K35	00000




						Corrosion-Resistant 302 Stainless Steel

						3.904"	0.675"	0.048"	6.204"	Not Rated	5.24	2.28	9630K52	00000


						4"	1"	0.12"	5.3"	Not Rated	70	50	9630K81	00000
						5"	1.125"	0.12"	6.6"	Not Rated	120	75	9630K83	00000
						5.75"	1.1"	1/8"	8.1"	Not Rated	68.15	29	9630K64	00000
						5.816"	1.192"	0.092"	9.066"	Not Rated	13.67	4.21	9630K58	00000
						5.856"	1.162"	0.072"	9.956"	Not Rated	11.38	2.77	9630K56	00000
						6"	1.219"	0.177"	7.5"	Not Rated	150	100	9630K85	00000
						7"	1.5"	0.187"	8.4"	Not Rated	210	150	9630K87	00000
						7.29"	0.875"	0.105"	10.04"	Not Rated	49.5	18	9630K61	00000
						7.375"	2.1"	1/4"	10.625"	Not Rated	213.3	65.69	9630K79	00000
						7.376"	2.1"	0.312"	9.566"	Not Rated	365.97	167.11	9630K77	00000


						8"	1.875"	1/4"	10"	Not Rated	240	118.68	9630K63	00000
						8.204"	1.746"	0.148"	12.604"	Not Rated	59.6	13.52	9630K65	00000
						8.336"	1.375"	0.207"	9.686"	Not Rated	195.75	145	9630K62	00000
						13.126"	2.462"	0.312"	16.826"	Not Rated	316.11	85.44	9630K73	00000
						13.25"	1.625"	1/4"	15"	Not Rated	262.5	150	9630K71	00000
						15.73"	1.87"	0.135"	20.73"	Not Rated	38.09	7.62	9630K75	00000