One Design · Multihull

A-Class Catamaran parts, rigging and specifications

Also known as: A-Cat, A Class

The A-Class Catamaran is a multihull one-design class, with a published length overall of 18 ft (5.49 m). MAURIPRO lists 10 parts for the A-Class Catamaran below, grouped by system, with live prices and stock.

Multihull
10 parts
5 published figures

Your A-Class Catamaran at MAURIPRO

What you can do on this page.

01Shop parts by system10 parts for the A-Class Catamaran, matched by part number and grouped by system.Shop all parts →

02Check the specifications5 published figures, each with its source.See specifications →

03Rig dimensionsI, J, P, E and other data we hold for this boat.See sailboat data →

04Get expert helpNot sure a part fits your A-Class Catamaran? Send us your sail number and year.Contact us →

A-Class Catamaran parts

Prices and stock are live from our catalogue.

Harken Block - 16mm Single - Forkhead
Harken · SKU HAR376 · On Harken layout: Outhaul
Harken Swivel Cam Cleat - Base (Standard) w/ Bullseye & Carbo-Cam 365 - Line: 1/8 to 3/8 in (3 to 10 mm)
Harken · SKU HAR241 · On Harken layout: Mainsheet Traveler, Outhaul
Harken Endstops Heavy-Duty - High-Beam - For Tracks: 7/8 in (22.0 mm) - Set of 2
Harken · SKU HAR264 · On Harken layout: Mainsheet Traveler
Harken Block - 16mm Single - Swivel
Harken · SKU HAR417 · On Harken layout: Outhaul
Harken Block - 16mm Single - Through-Deck
Harken · SKU HAR421 · On Harken layout: Outhaul
Harken Block - Carbo 29mm Single - Pivoting / 471 Carbo-Cam
Harken · SKU HAR396 · On Harken layout: Outhaul
Harken Block - Carbo T2 29mm Single
Harken · SKU HAR2146 · On Harken layout: Mainsheet Traveler, Outhaul
Harken Block - Micro 22mm Double
Harken · SKU HAR226 · On Harken layout: Outhaul
Harken Block - Micro 22mm Single - Through-Deck
Harken · SKU HAR242 · On Harken layout: Outhaul
Harken Block - Micro 22mm Triple
Harken · SKU HAR228 · On Harken layout: Outhaul

Harken part numbers cross-checked against Harken's published one-design deck layout for the A-Class Catamaran (checked 2026-11-04).

A-Class Catamaran specifications

Specification	Published figure	Source
Length overall (LOA)Class maximum boat length	5.490m (18 ft)	International A Class Catamaran Class Association / World Sailing - A Class Catamaran Rules 2024, rule D.4 (boat length 'not more than'), effective 2024-May-08
BeamClass maximum	2.300m (7 ft 7 in)	International A Class Catamaran Class Association / World Sailing - A Class Catamaran Rules 2024, rule D.4 Boat Beam, effective 2024-May-08
Hull weightClass minimum boat weight in dry condition	75.000 kg (165 lb)	International A Class Catamaran Class Association / World Sailing - A Class Catamaran Rules 2024, rule D.4 Boat Weight, effective 2024-May-08
Upwind sail areaClass maximum total sail area	13.940 m² (150 sq ft)	International A Class Catamaran Class Association / World Sailing - A Class Catamaran Rules 2024, rule G.2.2(a), effective 2024-May-08
Crew	One person	International A Class Catamaran Class Association / World Sailing - A Class Catamaran Rules 2024, rule C.5.1(a), effective 2024-May-08

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 A-Class Catamaran

A-Class Catamaran tuning guides

North Sails: A Class Catamaran Tuning GuideVersion 2017 · 1 page
IACA (International A-Division Catamaran Association) – Hugh Macgregor: Tech pages: Top tips from Hugh Macgregor on how to sail and set up the classic boat and rig6 pages
IACA (International A-Division Catamaran Association) – Chris Rashley: Chris Rashley's Setup SecretsVersion 2017 · 2 pages

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.

A-Class Catamaran class rules and references

Class rules: A Class Catamaran Rules 2024 (World Sailing), effective 2024-May-08, status Approved
Class association: a-cat.org
Builder: exploder.info

References checked 2026-11-04.

A-Class Catamaran buying questions

What A-Class Catamaran parts does MAURIPRO carry?

10 products are listed for the A-Class Catamaran on this page: blocks & sheaves (8); cleats, clutches & fairleads (1); travelers, tracks & cars (1). Prices and availability shown are live from our catalogue.

How do I know a part fits my A-Class Catamaran?

Each part here is linked to the A-Class Catamaran because its exact manufacturer part number appears on the A-Class Catamaran parts lists we reviewed (including Harken's published one-design deck layout for this class). 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 A-Class Catamaran rig dimensions?

Our A-Class Catamaran 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.

Are there tuning guides for the A-Class Catamaran?

Sailmakers have published tuning guides for this class, including North Sails (A Class Catamaran Tuning Guide, Web page, published 19 Jun 2017, last modified 19 Mar 2026); IACA (International A-Division Catamaran Association) – Hugh Macgregor (Tech pages: Top tips from Hugh Macgregor on how to sail and set up the classic boat and rig, Web page (undated; written before the Garda Europeans)); IACA (International A-Division Catamaran Association) – Chris Rashley (Chris Rashley's Setup Secrets, Web page, 11 Jul 2017). These guides belong to their publishers; MAURIPRO does not host or reproduce them, so please get them from the sailmaker or your class association.

Which rules govern the A-Class Catamaran?

The class is governed by its class rules (A Class Catamaran Rules 2024 (World Sailing), effective 2024-May-08, status Approved). Check the current edition with the class association before buying parts for racing.

Not sure which part fits your A-Class Catamaran?Send us your sail number, year and builder and our team will check it.