NG2 Masthead Assembly

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Isomat NG2 Masthead

The NG2 Masthead for Masthead Rigs is commonly used on Isomat Masts using the NG-51 through NG-105 Mast Sections, See: NG Mast Sections. Smaller NG Mast Sections (and sometimes the NG-51) use the NG1 Masthead, See: NG1 Masthead. Fractional Rigs on NG-60 and larger NG Mast Sections use a variety of welded semi-custom Fractional Mastheads, which often use a number of the Components listed below. The NG2 Masthead for Masthead Rigs consists of 2 cast pieces welded to the Mast Section and is easily identified by having 4 Sheaves (or provision for 4 sheaves) side by side, on the forward side. Masthead allows for 2 Main halyards, 2 Jib halyards, and 2 internal Jib/Spinnaker* halyards (using the 2 forward outboard sheaves) for a total of up to 6 halyards. The NG2 Masthead uses up to 6 Sheaves, NG2-3, and (2) Sheave Axles of 2 different lengths (fore & aft). Masthead includes provisions for attachment of Headstay, Backstay, and (2) Upper shrouds using Stemball rigging fittings. Parts for the NG2 Masthead are listed below. Optional Masthead Spinnaker Crane, NG2-2, for running External Spinnaker Halyards, is recommended for long-distance racing or cruising, See: Isomat Masthead Spinnaker Cranes.*



NG2 Masthead Parts

NG2 Masthead Cover Plate: NG2-1: Cast aluminum Masthead Cover Plate for NG2 standard Masthead. Masthead Cover Plate also provides level surface for mounting Anchor light and has holes and slots for exiting other electrical wires. Unit is 10 1/4" (260mm) long (maximum) x 7 1/8" (180mm) wide, and is fastened with two (2) 6mm screws, NG2-1S, that thread into tapped holes in Masthead.

NG2 Masthead Sheave, 85mm: NG2-3: Factory standard Acetyl Sheave is 85mm (3 3/8") x 15mm (5/8") wide x 22mm (7/8") ID. For Heavy-duty applications, use the aluminum version NG2-3A, below.
	NG2 Masthead Sheave, 85mm Aluminum: NG2-3A: Anodized Aluminum Sheave is 85mm (3 3/8") x 15mm (5/8") wide x 22mm (7/8") ID, and is much sturdier than the plastic version.
*NG2 Long (Forward) Masthead Sheave Axle: NG2-6L:* Long SS 'Drop-in' Tubular Masthead Sheave Axle is 22mm (7/8") OD x 81mm (3 1/4") long. Hollow Axle fits in Forward side of NG2 Masthead and supports 4 Jib/Spinnaker Halyard Sheaves (NG2-3 or *NG2-3A*).
*NG2 Short (Aft) Masthead Sheave Axle: NG2-6S:* Short SS 'Drop-in' Tubular Masthead Sheave Axle is 22mm (7/8") OD x 46mm (1 3/4") long. Hollow Axle fits in Aft side of NG2 Masthead and supports 2 Main Halyard Sheaves (NG2-3 or *NG2-3A*).
*NG2 Masthead Clevis Pin: NG2-6P:* SS Clevis Pin is used on the aft side of NG2 Masthead for attachment of topping lift, lazy jacks, or other items. This item is not standard on all masts and your Masthead may not have a hole drilled for this Pin, but, if not drilled, hole position is marked by an indent. Masthead can be easily drilled to add this item if required. Clevis Pin is 8mm (5/16") diameter with a 52mm (2 1/16") grip length. CPM8-52