Description Parts longer than 19mm will be tapped 9.5MM deep on both ends May also be available in other materials. Dimensions in mm. Metric Hex M4 Tapped Spacers Description Length Metric Thread OD Quote Tapped Hex Spacer, M4-.7 x 6MM 6 M4 x 0.7 6 Tapped Hex Spacer, M4-.7 x 8MM 8 M4 x 0.7 6 Tapped Hex Spacer, M4-.7 x 10MM 10 M4 x 0.7 6 Tapped Hex Spacer, M4-.7 x 12MM 12 M4 x 0.7 6 Tapped Hex Spacer, M4-.7 x 15MM 15 M4 x 0.7 6 Tapped Hex Spacer, M4-.7 x 18MM 18 M4 x 0.7 6 Tapped Hex Spacer, M4-.7 x 20MM 20 M4 x 0.7 6 Tapped Hex Spacer, M4-.7 x 25MM 25 M4 x 0.7 6