• Plug electrical knock-outs.
• Molded in silver gray color to resemble galvanized steel.
• Install quickly with fingertip pressure (no tool required).
• Economical.
• Multiple trade sizes fit 1/2" to 2" knock-out holes.
• Thick Panel Knock-Out Seals (KOST's) lock firmly in boxes up to 1/4" thick.
• Locking fingers in fractional increments up to the maximum panel thickness.
• Approximate Head Thickness: .062" (1,6 mm). Thickness may vary.
• To adapt a Knock-Out to accept a Heyco Strain Relief, see Heyco Knock-Out Adapters.

QuickSpecs

Material		Nylon 6/6
Certifications		Recognized under the Component Program of Underwriters' Laboratories File E51579
		Certified by the Canadian Standards Association File 8919
Flammability Rating		94V-2
Material Temperature Index		275°F (135°C) - Maximum temperature on part not to exceed 221°F (105°C)

MOUNTING HOLE DIAMETER		TRADE SIZE	PART NO.	DESCRIPTION	PART DIMENSIONS				CAD
			Silver Gray		A Head Diameter		B Overall Height
in.	mm.				in.	mm.	in.	mm.
Multiple Locking Steps for Panel Thickness up to .250" (6,4 mm)
.875	22,2	1/2	3991	KOST 1/2	1.02	25,8	.56	14,3
1.093	27,8	3/4	3992	KOST 3/4	1.22	31,0
1.375	34,9	1	3993	KOST 1	1.50	38,1
1.750	44,5	1-1/4	3994	KOST 1-1/4	1.91	48,4
2.000	50,8	1-1/2	3995	KOST 1-1/2	2.16	54,9	.58	14,7
2.500	63,5	2	4002	KOS 2	2.73	69,3	.75	19,1

Standard color silver gray.