Flat head floorboard screws, six-lobe drive, oil finish

Newport Fasteners ★ 4.3/5 · ItemOracle Score Budget

$45 USD
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5/16-18 x 3 Flat Head Floorboard Thread Cutting Screws, Type F, (Star - Six Lobe Drive), Black Phosphate Finish, Countersunk, T-40 Drive (Carton: 100pcs) Alloy Steel

Self-tapping floorboard screws with a flush countersunk head and six-lobe drive. Ideal for wood floors in trailer decking; oil finish acts as rust inhibitor and lubricant. Customers cite ease of installation, durability, and good value

Highlights

  • six-lobe drive for ease of driving
  • flush countersunk head for flat surface
  • rust-inhibiting oil finish

Pros

  • flush countersunk head design
  • six-lobe drive for secure engagement
  • self-tapping thread cutting for wood floors
  • oil finish provides rust protection and lubrication
  • good durability and ease of installation (customer feedback)

Cons

  • mixed opinions on screw size

Best For

  • floorboard fastening in trailer decks
  • installing wood floors in vehicles
  • replacing trailer floor boards
  • working with metal plate sheets (1/4 inch) depending on application

Features

  • Designed for installing wood floors into truck trailers
  • Six-lobe recess, flat head floorboard screws
  • Self-tapping, thread-cutting screws measured from head to tip
  • Black phosphate with oil finish for rust inhibition and lubrication
  • Flush countersunk head for smooth floorboard fastening

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