51 mm Springs | McMaster-Carr

With the Raymond color code, you'll always grab the die spring with the right load rating. The chrome-silicon steel is stronger than spring steel and handles repeated stress for longer periods of time. Rely on these springs for high-volume jobs, such as stamping and injection molding. A powder coating prevents rust in wet environments. The closed, ground ends create a flat surface that balances your load, even as it moves.

Metric

Deflection @ Maximum Load—The percentage represents how much a spring compresses from its original length.

				Wire, mm
	For Hole Dia., mm	For Shaft Dia., mm	Lg., mm	Thk.	Wd.	Compressed Lg. @ Max. Load, mm	Deflection @ Max. Load	Max. Load, lb.	Spring Rate, lbf/mm	Material	End Type	Specs. Met		Each
Green (Light Load)



		10	5	51	0.99	1.78	33.1	35%	20	1.1	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	00000


		12.5	6	51	1.32	2.36	33.1	35%	45	2.5	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000
		16	8	51	1.75	2.77	33.1	35%	62	3.5	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000
		20	10	51	1.91	4.19	33.1	35%	98	5.5	Chrome Silicon Steel	Closed and Ground	ISO 10243	0000000	0000
		25	12.5	51	2.54	5.46	33.1	35%	175	9.8	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000
		32	16	51	2.92	7.24	33.1	35%	265	15	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	00000
		40	20	51	3.43	8.76	33.1	35%	365	20	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	00000


		Blue (Medium Load)



				10	5	51	1.17	1.85	35.7	30%	30	2	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000


				12.5	6	51	1.55	2.39	35.7	30%	53	3.4	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000
				16	8	51	2.06	3.12	35.7	30%	90	5.9	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000
				20	10	51	2.36	3.96	35.7	30%	140	9.3	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000
				25	12.5	51	2.92	5.54	35.7	30%	235	15	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	00000
				32	16	51	3.96	7.14	35.7	30%	460	30	Chrome Silicon Steel	Closed and Ground	ISO 10243	0000000	00000
				40	20	51	4.75	7.92	35.7	30%	620	40	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	00000


				Red (Heavy Load)



						10	5	51	1.37	1.83	38.2	25%	36	2.8	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000


						12.5	6	51	1.83	2.41	38.2	25%	56	4.4	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000
						16	8	51	2.36	3.18	38.2	25%	105	8.3	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000
						20	10	51	3.18	4.19	38.2	25%	265	21	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000
						25	12.5	51	4.01	5.61	38.2	25%	445	35	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	00000
						32	16	51	5.08	7.26	38.2	25%	795	61	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	00000
						40	20	51	6.60	8.64	38.2	25%	1,000	78	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	00000


						Yellow (Extra-Heavy Load)



								16	8	51	2.79	3.20	40.8	20%	115	12	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	0000


								20	10	51	4.09	4.06	40.8	20%	290	28	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	00000
								25	12.5	51	4.95	5.49	40.8	20%	475	46	Chrome Silicon Steel	Closed and Ground	ISO 10243	00000000	00000

Compression Springs

Squeeze these springs and they’ll push right back to their original length. When compressed, they apply steady pressure to keep components securely in place. Release the pressure and they snap back instantly, just like the tip of a ballpoint pen.

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 compress than steel, but can’t handle as high a load.

	OD, mm	ID, mm	Wire Dia., mm	Compressed Lg. @ Max. Load, mm	Max. Load, lb.	Spring Rate, lbf/mm	End Type	Specs. Met	Pkg. Qty.		Pkg.
Corrosion-Resistant 302 Stainless Steel



	51	37	27	5	28.7	225	10	Closed and Ground	DIN 2095	1	00000000	000000