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Ten rubber well nuts with flanged bushings and embedded M4 nuts

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 39468 Rubber Rivet Nut M4-0.70 12mm 10 PK

SKU CH-C41Z-E6PRK

A pack of ten rubber well nuts with M4‑0.70 threads and 12 mm length for blind fastening and hole sealing

  • TypeRivets
  • M4-0.70 thread fits standard metric bolts
  • 12 mm length suits typical panel thicknesses
  • Rubber body seals the hole against moisture
  • 10-piece pack covers multiple fastening points
  • Well-nut design allows blind installation from one side

Fastening hardware for blind mounting

This pack contains ten M4-0.70 rubber rivet nuts designed for blind fastening where only one side of the workpiece is accessible. Each unit combines a flanged neoprene bushing with an embedded nut to clamp and seal the hole in a single step. They suit automotive panels, enclosures and general fabrication tasks that require a watertight joint.

Thermal and electrical behaviour

The neoprene body remains flexible across typical service temperatures and does not conduct electricity, so the fastener insulates the bolt from the panel. No power is drawn and no noise is generated because the parts are purely mechanical. The rubber also dampens vibration that would otherwise loosen a metal insert over time.

Integration and clearance

A 12 mm overall length fits thin sheet material without protruding excessively on the blind side. Installation only requires a drilled hole and a standard M4 bolt; no special setting tool is needed. The flange sits flush to spread the load, while the rubber seal prevents moisture ingress. Buyers needing a metal-threaded insert for higher shear loads or a different thread pitch will need another solution.

Highlights

  • M4-0.70 thread fits standard metric bolts
  • 12 mm length suits typical panel thicknesses
  • Rubber body seals the hole against moisture
  • 10-piece pack covers multiple fastening points
  • Well-nut design allows blind installation from one side

Specifications

BrandMIDWEST FASTENER
TypeRivets

Questions about this item

How do I install the M4-0.70 rubber rivet nut and what step is often missed?

Insert the flanged neoprene bushing through the hole from the flange side, then thread the bolt into the embedded nut; the step often missed is tightening until the rubber body expands fully to seal and grip the panel.

What maintenance or replacement will the 10-pack of rubber well nuts need over time?

Inspect the neoprene bushings for cracking, hardening or loss of elasticity caused by heat, oil or UV exposure; replace any that no longer compress and seal the hole properly.

What limit appears first when the M4-0.70 rubber rivet nut is under sustained vibration or load?

The neoprene body will fatigue and lose clamping force before the M4-0.70 threads strip, so the rubber-to-metal bond is the first failure point under prolonged stress.

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