HEYCO® Double-D Strain Relief Hole Plugs close unused strain relief mounting holes or other chorded or "DD" holes where holes are punched or molded with two opposing flats.
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Item #

Item Name

Mounting Hole Diameter

Inside Diameter

Overall Height

20300207-A010 N/A HEYCO® 0.453 Inch (in) Inside Diameter White Double-D Strain Relief Hole Plug N/A 0.512 in13.00 mm N/A 0.453 in11.50 mm N/A 0.403 in10.20 mm
20300106-A010 N/A HEYCO® 0.530 Inch (in) Inside Diameter White Double-D Strain Relief Hole Plug N/A 0.562 in14.30 mm N/A 0.530 in13.50 mm N/A 0.406 in10.30 mm
20300207-A030 N/A HEYCO® 0.453 Inch (in) Inside Diameter Black Double-D Strain Relief Hole Plug N/A 0.512 in13.00 mm N/A 0.453 in11.50 mm N/A 0.403 in10.20 mm
20791004-A010 N/A HEYCO® 0.550 Inch (in) Inside Diameter White Double-D Strain Relief Hole Plug N/A 0.625 in15.90 mm N/A 0.550 in14.00 mm N/A 0.406 in10.30 mm
20797001-A010 N/A HEYCO® 0.390 Inch (in) Inside Diameter White Double-D Strain Relief Hole Plug N/A 0.437 in11.10 mm N/A 0.390 in9.90 mm N/A 0.406 in10.30 mm
20797001-A030I N/A HEYCO® 0.390 Inch (in) Inside Diameter Black Double-D Strain Relief Hole Plug N/A 0.437 in11.10 mm N/A 0.390 in9.90 mm N/A 0.406 in10.30 mm
20797002-A010 N/A HEYCO® 0.445 Inch (in) Inside Diameter White Double-D Strain Relief Hole Plug N/A 0.500 in12.70 mm N/A 0.445 in11.30 mm N/A 0.406 in10.30 mm
20797003-A030I N/A HEYCO® 0.530 Inch (in) Inside Diameter Black Double-D Strain Relief Hole Plug N/A 0.562 in14.30 mm N/A 0.530 in13.50 mm N/A 0.406 in10.30 mm
20797005-A010 N/A HEYCO® 0.625 Inch (in) Inside Diameter White Double-D Strain Relief Hole Plug N/A 0.750 in19.00 mm N/A 0.625 in15.90 mm N/A 0.453 in11.50 mm
20797006-A010 N/A HEYCO® 0.770 Inch (in) Inside Diameter White Double-D Strain Relief Hole Plug N/A 0.875 in22.20 mm N/A 0.770 in19.60 mm N/A 0.453 in11.50 mm
20797006-A030I N/A HEYCO® 0.770 Inch (in) Inside Diameter Black Double-D Strain Relief Hole Plug N/A 0.875 in22.20 mm N/A 0.770 in19.60 mm N/A 0.453 in11.50 mm
20791004-A030I N/A HEYCO® 0.550 Inch (in) Inside Diameter Black Double-D Strain Relief Hole Plug N/A 0.625 in15.90 mm N/A 0.550 in14.00 mm N/A 0.406 in10.30 mm
20797002-A030I N/A HEYCO® 0.445 Inch (in) Inside Diameter Black Double-D Strain Relief Hole Plug N/A 0.500 in12.70 mm N/A 0.445 in11.30 mm N/A 0.406 in10.30 mm
20797005-A030I N/A HEYCO® 0.625 Inch (in) Inside Diameter Black Double-D Strain Relief Hole Plug N/A 0.750 in19.00 mm N/A 0.625 in15.90 mm N/A 0.406 in10.30 mm
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