H2o M5 Neoprene Well Nut Inc A4 Stainless Steel BLACK Pozi Screw (Pack 6) Long Type (J)



M5 x 40mm Black Pozi Pan Head Screws (DIN 7985Z) - A4 Stainless
Steel - Chemical Black Finish


These marine grade  stainless steel A4 chemically blackened screws have been salt tested to comply with some automotive regulations – the screws were subjected to 330 hours of salt spray testing without any corrosion.

Well Nuts The ultimate Fixing (Pack of 6)   Extra Long


Grip Range 8-16mm 

40 mm Screws

25 mm Long Well Nut

Simple to install

Drill Size 10mm

A4 Marine Grade Stainless Steel

Place 'Well-Nut' insert all the way into the pre-drilled hole until the flange is firmly against the mounting surface.

  • Pass the machine screw through the part to be fastened and tighten until snug

'Well Nut', a flanged neoprene bushing with a captive brass nut, is designed to provide a shock and vibration resistant fixing for engineering structures. This demountable blind screw anchor is suitable for applications of many kinds in many conditions, in materials from thin gauge metals to plastic sheet up to 16.5mm thick; a high rate of radial expansion even allows use in blind holes in solid materials.


  • Access needed to only one side of the workpiece
  • Used with standard metric machine screws
  • Fastens in blind, burr-free holes
  • Can be used in closed end holes
  • Will not mar prefinished surfaces
  • Helps seal out ambient moisture
  • Absorbs noise
  • Electrically isolating
  • Dampens vibration and shock
  • Helps prevent galvanic corrosion
  • Ideal for metal-to-plastic and other mixed material assemblies
  • Resistant to ozone and weathering in outdoor conditions
  • Suitable for marine applications
  • Removable and reusable
  • Snap-in feature to facilitate assembly line use