We Ship Worldwide! Shipping information.

One Design · Keelboat

J/30 parts, rigging and specifications

The J/30 is a keelboat one-design class designed by Johnstone (1979), with a published length overall of 29 ft 10 in (9.08 m). MAURIPRO lists 77 parts for the J/30 below, grouped by system, with live prices and stock.

  • Keelboat
  • 77 parts
  • 6 published figures

Your J/30 at MAURIPRO

What you can do on this page.

01Shop parts by system77 parts for the J/30, matched by part number and grouped by system.Shop all parts →
02Check the specifications6 published figures, each with its source.See specifications →
03Halyards & sheets made for it28 lines made up to this boat's lengths.Shop halyards & sheets →
04Get expert helpNot sure a part fits your J/30? Send us your sail number and year.Contact us →

Shop J/30 by system

J/30 parts

Prices and stock are live from our catalogue.

Parts marked "Sized for this boat" are chosen from the manufacturer sizing guides published on our Selection Guides pages (Harken winch chart, Forespar pole guide, Harken mainsheet guide, Schaefer hardware chart) using the published dimensions of the J/30. They are not specified by the class rules; check your class rules for limits before racing.

Rope sold by the foot is added at the cut length shown on the card.

J/30 specifications

SpecificationPublished figureSource
Length overall (LOA)29.8 ft (9.1 m)MAURIPRO Sailboat Data; matches Wikipedia
Waterline length (LWL)25.0 ft (7.6 m)MAURIPRO Sailboat Data; matches Wikipedia
Beam11.2 ft (3.4 m)MAURIPRO Sailboat Data; matches Wikipedia
DesignerJohnstoneMAURIPRO Sailboat Data; matches Wikipedia
First built / designed1979MAURIPRO Sailboat Data; matches Wikipedia
RigFractional SloopMAURIPRO Sailboat Data; matches Wikipedia

Figures are shown as each source publishes them, with the other unit converted. Class rules set the measurements that count for racing.

More for the J/30

J/30 tuning guides

  • North Sails: J/30 Quick Reference Tuning GuideVersion 2002 · 1 page
  • North Sails: J/30 Tuning Guide for North Sails
  • UK Sailmakers (UK-Halsey): UK Sailmakers J/30 Mast Tuning and Upwind Sail Trim
  • Banks Sails: Banks Sails J/30 Tuning GuideVersion 1996
  • Shore Sails: J/30 Tuning Guide and J/30 Sailing Techniques (Shore Sails Rhode Island)

Tuning guides belong to the sailmakers that publish them. MAURIPRO does not host or reproduce them; ask the sailmaker or your class association for a copy.

J/30 class rules and references

  • Class association: j30.us
  • Builder: jboats.com

J/30 buying questions

What J/30 parts does MAURIPRO carry?

77 products are listed for the J/30 on this page: halyards, sheets & control lines (40); blocks & sheaves (3); travelers, tracks & cars (4); winches & handles (5); spars, poles & rig fittings (3); covers & bags (3); and more. Prices and availability shown are live from our catalogue.

How do I know a part fits my J/30?

Each part here is linked to the J/30 because its exact manufacturer part number appears on the J/30 parts lists we reviewed. Fit can still depend on your boat's year, builder and rig, so check the product details and your class rules, or ask our technical team before you order.

Where can I find the J/30 rig dimensions?

Our J/30 Sailboat Data page lists the rig dimensions (I, J, P, E) and other published data we hold for this boat. Figures there come from a sailboat database and may differ from class measurement rules.

Can I order halyards and sheets made for the J/30?

Yes. Our J/30 - Halyards & Sheets page lists 28 halyard and sheet options made up for this boat.

Are there tuning guides for the J/30?

Sailmakers have published tuning guides for this class, including North Sails (J/30 Quick Reference Tuning Guide, Version 1.00 (PDF created August 2002 from a spreadsheet titled "Quick Tuning 7-02"; file author Tim Dawson)); North Sails (J/30 Tuning Guide for North Sails, Undated Word document on the class site); UK Sailmakers (UK-Halsey) (UK Sailmakers J/30 Mast Tuning and Upwind Sail Trim, Undated Word document on the class site); Banks Sails (Banks Sails J/30 Tuning Guide, Last update 7 January 1996 (copied from the old J/30 website)). These guides belong to their publishers; MAURIPRO does not host or reproduce them, so please get them from the sailmaker or your class association.

Not sure which part fits your J/30?Send us your sail number, year and builder and our team will check it.
Contact us
← All one-design classes

Everything in this collection

All products currently in this MAURIPRO collection, with filters.

View as