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Set of Three Caulking Irons

$67.00 $64.00

Caulking irons are used to drive oakum, cotton or rope fibers in the seams of a ship’s wooden deck or side / hull to make it watertight. It also plays a structural role in tightening up the hull / deck of a ship and reduces the longitudinal movement of neighboring planks. Actual Shipping will be charged when item ships–typically less than $7 USA and less than $28 internationally.

Description

Caulking is defined by driving oakum, cotton or general rope fibres in the seams of a ship’s wooden deck or side / hull to make it watertight. It also plays a structural role in tightening up the hull / deck of a ship and reduces the longitudinal movement of neighbouring planks.

The three caulking irons in the set are:

C.S. Osborne Caulking Iron Size: 00, Thickness: 1/32″, Width: 2″, Length: 5″
Material: Cast Malleable iron with a Polished blade

C.S. Osborne Caulking Iron Size: 0, Thickness: 1/16″, Width: 2-1/2″, Length: 5-5/8″
Material: Cast Malleable iron with a Polished blade

C.S. Osborne Caulking Iron Size: 1, Thickness-1/8″, Width: 2-1/4″, Length: 5-7/8″
Material: Cast Malleable iron with a Polished blade

Set of three includes one of each size; 00, 0, and 1, with 1 being the thickest, and 00 thinnest.

*Actual shipping will be charged for orders outside of the USA

History of Caulking Irons

Traditional caulking (also spelled calking) on wooden vessels uses fibers of cotton and oakum (hemp fiber soaked in pine tar). These fibers are driven into the wedge-shaped seam between planks, with a caulking mallet and a broad chisel-like tool called a caulking iron. The caulking is then covered over with a putty, in the case of hull seams, or else in deck seams with melted pine pitch, in a process referred to as paying, or “calefaction.” Modern marine sealants are frequently used now in place of the pitch, or even to supplant the oakum and cotton itself. See the product video to learn a little about caulking irons.

Making Irons, otherwise known as Crease, Starting or Putting Irons are for putting the cotton into the seams. They come in various thicknesses to suit the width of the seam. This is the one tool which you will need.

The Dumb Iron is used to widen out any seams which are too narrow or closely planked to allow the cotton in. You can widen hardwood seams with a rake but this is not advisable on soft wood or on end-grain such as butt seams or nib ends.

Nib or king plank irons are just narrow making irons used for areas where a standard iron would be too wide to fit. Areas such as nib ends and curved seams.

Bent irons are standard irons which have been curved to allow access to those awkward places like garboard seams.

The purpose of the Hardening iron is to firm down the cotton into the seam. It has a curved edge that is thick and has a groove in that edge. But it is bad to harden down too much, remember that too much force will be worse than too little. Over-caulking can lead to broken frames when the boat is launched and the planking takes up moisture.

Additional information

Weight1.25 lbs
Caulking Iron Size

Size 0, Size 00, Size 1, Set of all three three: 00, 0, 1

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Product Video

Vendor Information

  • Store Name: C.S. Osborne Industrial, Hand, and Leather Tools
  • Vendor: C.S. Osborne
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