Optical Fibers | McMaster-Carr

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18 Products

Illuminating Glass Fiber Bundles

Light up small and hard-to-reach areas. These bundles are often used in fiberscopes and borescopes. They’re also good for lighting small areas in models, prototypes, and circuit boards. They transmit all colors of visible light and some wavelengths of infrared light.

For precise lighting, they have two layers—the outer layer keeps light contained within the inner glass core. Bundles with a larger diameter have more fibers, so they give off more light.

A separate light source is needed to illuminate them. Connect them to an LED strip or other light source using heat-shrink tubing or a fitted part, such as a ferrule. They’re not for use in telecommunication cables.

0.55 Numerical Aperture—Fiber bundles with 0.55 numerical aperture cover a smaller area than those with 0.66 numerical aperture, making them good for lighting angles that have less space.

0.66 Numerical Aperture—Choose fiber bundles with 0.66 numerical aperture for general purpose illumination.

Borosilicate Glass—Made of borosilicate glass, the fibers resist greater heat and transmit light better than plastic fibers.

Numerical Aperture—The numerical aperture describes the maximum angle of light each fiber accepts and emits. To send light efficiently, use a light source with an angle at or below the numerical aperture.

								6 ft. Long		9 ft. Long		19 1/2 ft. Long
	Bundle Dia.	Acceptance Angle	Wavelength Range, nm	Core Dia., μm	Fiber Bend Radius	Max. Temp., ° F	Material		Each		Each		Each
0.55 Numerical Aperture



		1/16"	67°	400 to 1,600	50	0.25"	890	Borosilicate Glass	5259N13	000000	5259N12	000000	5259N11	000000


		1/8"	67°	400 to 1,600	50	0.25"	890	Borosilicate Glass	5259N16	00000	5259N15	00000	5259N14	00000
		1/4"	67°	400 to 1,600	50	0.25"	890	Borosilicate Glass	5259N19	000000	5259N18	000000	5259N17	000000


		0.66 Numerical Aperture



				1/16"	83°	400 to 1,600	50	0.25"	890	Borosilicate Glass	5259N23	00000	5259N22	00000	5259N21	00000


				1/8"	83°	400 to 1,600	50	0.25"	890	Borosilicate Glass	5259N26	00000	5259N25	00000	5259N24	00000
				1/4"	83°	400 to 1,600	50	0.25"	890	Borosilicate Glass	5259N29	000000	5259N28	000000	5259N27	000000