0018 3/8" Thick 4.5" OD Round Aluminum Countersunk Pad - ISO View
0018 3/8" Thick 4.5" OD Round Aluminum Countersunk Pad - Spec Sheet Drawing
0018 3/8" Thick 4.5" OD Round Aluminum Countersunk Pad - Top View
0018 3/8" Thick 4.5" OD Round Aluminum Countersunk Pad - Side Profile
0018 3/8" Thick 4.5" OD Round Aluminum Countersunk Pad - ISO View
0018 3/8" Thick 4.5" OD Round Aluminum Countersunk Pad - Spec Sheet Drawing
0018 3/8" Thick 4.5" OD Round Aluminum Countersunk Pad - Top View
0018 3/8" Thick 4.5" OD Round Aluminum Countersunk Pad - Side Profile
0018 3/8" Thick 4.5" OD Round Aluminum Countersunk Pad - Interactive 3D Model

3/8" Thick 4.5" OD Round Aluminum Countersunk Pad | Center Vent Hole | Marine Grade 6061-T6

Part Number: 0018

$ 14.00
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4.5" OD Round Aluminum Countersunk Pad

CNC-machined round countersunk pad with center vent hole, designed for flush-mount fastening on fiberglass deck surfaces in marine environments. Three countersunk outer holes allow screw heads to sit flush, while the center hole provides a weld vent for through-deck installations.

Key Specifications

  • Material: Marine Grade 6061-T6 Aluminum.
  • Outside Diameter: 4.5".
  • Thickness: 0.375" (3/8").
  • Mounting Holes: 3 countersunk holes (5/16" diameter for 1/4" fasteners).
  • Center Hole: 1 vent hole (for welding/pass-through).
  • Shape: Round.
  • Weight: 0.53 lb.

Finish: Matte. Lightly tumbled for deburring. Paint/powder coat ready.

Applications: T-tops, tuna towers, hard tops, radar arches, leaning posts, grab bars, bow rails, outrigger mounts, rod holders.

Marine-grade 6061-T6 aluminum — suitable for saltwater environments per ABYC standards.

Trust Welding World, Inc. for your marine hardware — precision-cut aluminum components for professional marine fabrication.

Shipping: 1–2 work days.

  • Local pickup available
  • One Business Day Shipping
  • Call us Mon.-Fri. 9:00 a.m. to 4:00 p.m. if in any doubt.

Due to this item's size and weight we can only ship it in an economical way via Less Than Truckload (LTL) consolidated land shipping, and only to the contiguous 48 States.

For shipping inquiries to AK, HI, PR, US-VI, and international shipping, please contact us first at sales@weldingworldinc.com.

All of the destinations above we can only serve as a Free Carrier (or FCA) modality, that requires the customer to contract and pay for their carrier service of choice. We can still ship the item, but only to a warehouse/receiving office within the 48-contiguous States.

In plain terms what this means is that if you want to ship your product to any non-contiguous US territory or internationally, you, the customer, has to provide us with the warehouse address of the carrier that serves your locality with an address within the contiguous 48-US States, as we do not ship overseas on our own.

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