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Heyco® Knock-Out Seals and Thick Panel Knock-Out Seals

Mounting Hole Diameter Range: 1/2" to 2" Electrical Knock-Outs (.875" to 2.500" nominal)

  • Part Numbers and Specifications
  • Features
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 .125" (3,2 mm)

.875 22,2 1/2 3997 KOS 1/2 1.02 25,8 .45 11,5 CAD
1.093 27,8 3/4 3998 KOS 3/4 1.22 31,0 CAD
1.375 34,9 1 3999 KOS 1 1.50 38,1 CAD
1.750 44,5 1-1/4 4000 KOS 1-1/4 1.91 48,4 .47 12,0 CAD
2.000 50,8 1-1/2 4001 KOS 1-1/2 2.16 54,9 .45 11,5 CAD

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 CAD
1.093 27,8 3/4 3992 KOST 3/4 1.22 31,0 CAD
1.375 34,9 1 3993 KOST 1 1.50 38,1 CAD
1.750 44,5 1-1/4 3994 KOST 1-1/4 1.91 48,4 CAD
2.000 50,8 1-1/2 3995 KOST 1-1/2 2.16 54,9 .58 14,7 CAD
2.500 63,5 2 4002 KOS 2 2.73 69,3 .75 19,1 CAD

Standard color silver gray.

  • 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.
  • Lock firmly in boxes up to 1/8" thick, except for Part Number 4002 (KOS 2) and Thick Panel Knock-Out Seals (KOST's), which 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 ru Recognized under the Component Program of Underwriters' Laboratories File E51579
csa Certified by the Canadian Standards Association File 8919
Flammability Rating   94V-2
Temperature Range   -40°F (-40°C) to 221°F (105°C)
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