Nylon standoffs are useful for permanently mounting circuit boards or to serve as feet. F/F standoffs accept screws from both ends.
Non-conductive with female/female M4 threads
Male Female Nylon Hex Standoff Assortment Kit with Plastic Screws
Standoff M3 Aluminium Hex 5mm x 30mm Black (4 Pack) - ImpulseRC
4 40 Standoff for sale
: Tools & Home Improvement
4mm (M4) Nylon Spacers Standoff Washers (12 Pack) 4 x 15mm, 4 x 10mm, 4 x 5mm - Black
Standoff - Nylon (4-40; 3/4; 10 pack) - PRT-11796 - SparkFun
Screw M4 Hex Nylon Standoff Black Male Female Plastic Mount
M4 Hex Brass Standoff Male Female Pillar Stud Board Hexagon
4-40X1 1/4 Hex Male-Female - Standoffs - Nylon
New M4 Anodized Black Aluminum Hex Standoff/Spacer 30pcs/Bag (M4X7.0X30mm, Hex): : Industrial & Scientific
Non-conductive 8mm long with M3 threads
Nylon Hex Standoff F-F M3x8mm (10-Pack)
Male Female Nylon Hex Standoff Assortment Kit with Plastic Screws Nuts M2 M2.5 M3 M4 Insulation Plastic Standoff Spacer Set
PATIKIL M4 Nylon Hex Standoff Screws Nuts, 1Set/40Pack PCB Male Female Threaded Kit for Motherboards, Computer Cases, Circuit Boards, Electronics (50mm+5mm, Black): : Industrial & Scientific
4 40 Standoff for sale
: Tools & Home Improvement
M4 Hex Brass Standoff Male Female Pillar Stud Board Hexagon Mounting PCB Motherboard Spacer Bolt Screw Nut Assortment Kit Fastener 120Pcs
Nylon F/F 1 x 1/4 Standoffs (4-40) (10) - RobotShop