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CSK Post Head Anchor M3-4x20 316 x 1

Stock Code:
3168072
Price:
$2.23

CSK Post Head Anchor M3–4 × 20 316 (Single)

This M3–4 × 20 CSK Post Head Anchor is manufactured from premium 316 marine-grade stainless steel, providing outstanding corrosion resistance for coastal, marine, and outdoor environments. The countersunk (CSK) head sits flush on the surface, giving a clean, low-profile finish ideal for balustrade posts, architectural fittings, and stainless assemblies.

The M3–4 specification indicates an M3 internal female thread with a 4 mm outside diameter body. This allows a male-threaded fastener to be inserted from the opposite side, creating a secure and concealed connection with no exposed threads on the visible face.
These fasteners are also commonly referred to as sex bolts or mating bolts, due to their male-and-female threaded connection style.

Key Features:

  • Size: M3–4 × 20 (M3 female thread, 4 mm OD body)

  • Material: 316 stainless steel

  • Countersunk (CSK) head for a flush, professional finish

  • Internal M3 female thread pairs with a male fastener from the other side

  • Also known as sex bolts / mating bolts

  • Exceptional corrosion resistance for marine and outdoor environments

  • Precision-machined threads for reliable, smooth installation

  • Supplied individually (x1)

A clean, secure fastening solution ideal for balustrade installations, stainless architectural work, signage, panels, and any application requiring a concealed threaded connection.

Details

  • Diameter:
    M3
  • Length:
    20
  • Thread Pitch:
    0.5
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