Spars, Rigging, and Hardware for Sailboats

Rig-Rite, Inc.
Phone: (001) 401-739-1140 -- FAX: (001) 401-739-1149
www.RigRite.com       Ordering/Questions

ISOMAT  Mast Specifications & Components


Listed below are the Original Isomat Mast Sections. All Isomat Mast Sections feature an integral Spinnaker Track on the forward side of the mast (approximately 3" wide, running the full length of the mast) for special Spinnaker Cars. Later Mast Sections used by Isomat did not have this feature, for them, See Sparcraft Mast Sections.

Click on individual Mast Sections, below, to see all hardware commonly used on those Sections.
For common replacement Mast Parts, See Isomat Mast Components, below.

See also Isomat Booms & Components, and Isomat Spreaders & Components.
 

Isomat Mast Sections

Cross-Sections Section Number Outside
Dimensions Height x Width
Wall Thickness Weight (lbs./ft) Moments of Inertia

Ixx
(in4)

Iyy
(in4)

Isomat NG Mast Sections NG28 5.20" x 3.74" .100" 2.19 6.24 3.23
NG31. 6.28" x 4.10" .095" 2.48 10.19 4.39
NG37. 6.69" x 4.53" .105" 2.64 12.38 5.02
NG46. 7.09" x 4.72" .125" 3.09 16.34 7.54
NG51 7.48" x 4.92" .135" 3.43 19.94 9.37
NG60 8.07" x 5.39" .130" 4.03 26.43 12.73
NG70 8.66" x 5.71" .152" 4.77 34.36 15.98
NG80 9.06" x 6.10" .160" 5.38 42.77 19.94
NG86 9.84" x 6.77" .175" 5.78 51.66 25.23
NG105 11.14" x 7.17" .170" 7.06 77.65 37.29
 

Isomat Mast Components

Isomat uses a number of common components in their Spar Assemblies. Parts that are common to a variety of Mast Sections are listed below. Many Mast Parts, however, are specific to individual, or a small number of Mast Sections, and are listed under those particular Mast Sections.
For Parts not listed below, determine which Mast Section you have by measuring maximum Outside Dimensions. Click on specific Mast Sections (above) to see all hardware commonly used with those Sections.
 
Sheaves & Rollers
Mastheads NG1, NG2
External Masthead Spinnaker Cranes

External Spinnaker Halyard Blocks
Masthead Stemball / Eye Adapters
Halyard Fairleads / Eyes / Spectacles
Forestay/Staysail Stay Tangs
Fractional Jib Boxes
Exit Blocks / Sheave Boxes
Spreaders
Isomat Spinnaker Cars
Spinnaker Cars for T-Track
Halyard Exit Plates

Spar Cleats
Welded Mast Base Exit Boxes
Vang Brackets & Vang Toggles
Solid Vangs
Mast Base Turning Blocks & Attachments
Mast Wedges
Deck Tie-down Turnbuckles

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