Lewmar Acrylic codes - evolution and comprehension

Updated: Dec 30, 2020

All Lewmar Hatches and Portlights (except old Standard) produced since October 1997 have had identification information heat stamped on the acrylic. On Portlights and Fixedlights the information is under the LEWMAR branding. On hatches the information is between the right hand handle and the edge of the acrylic.


The structure of the coding was changed from July 2007. Codes on products manufactured prior to this date allow the size and range and even the acrylic colour to be determined easily, but this is not the case after.


Hatches (<July 2007)


For Ocean, Coastline, Trimport, Trimline or Concept.


(A) If the code is prefixed with 'SZ', the size is determined from the two digits following the 'SZ', eg SZ60 = Size 60 hatch


(B) if the code is a number prefixed '399' and of format '399SSXR', eg '3996003' where:-

SS is the hatch size, in the example Size 60

X is the acrylic colour, in the example 0 for GREY tint (9T21)

R is the Range, 3 is Low Profile, as in the example, and 2 is Medium Profile

On Mk 2 Low & Medium Profile hatches the number is preceded by and “A” eg. 'A3996002'


(C) if the code is a number in the form "300XXX" for the first six digits eg. '300380' this is a custom hatch or portlight. The full code will likely be longer eg '300380000'. This part code is for matching rather than interpretation.


Portlights (<July 2007)


For New Standard, Atlantic, Ocean or ASTAR (Hallberg Rassy only). Note that acrylics may also be labelled just 'Portlight'.


(A) If the code is prefixed by 'SZ' you can determine the size & type based on the two digits following the 'SZ', eg :

SZ42 = New Standard size 4 (4), opening (2) portlight

SZ41 = New Standard size 4 (4), fixed (1) portlight

Note that the model name is normally hot stamped above the code.


(B) as (C) above for custom units.


Hatches & Portlights (July 2007-)


From July 2007 the code incorporates an identification number and a date code. The date code has the five digit format DDMYY as described below where DD and YY are numbers and M is a character. Other information previously included, eg range name and size is no longer included.


From Lewmar : The identification number is not immediately recognizable by distributors or end users and a conversion 'database' is now required. The identification number represents the component part number of the acrylic. Note that this is not the same as the part number for the acrylic as a spare.


Why change? : The original coding does not pick up many features for hatches. For instance it does not identify if a vent or lock and key kit has been fitted. It also does not identify if a Friction Lever or Telescopic (powerboat) Stay is used. The lens coding is also not effective for signature portlight sizes. On these products only the factory can interpret the code. Plans for product changes and development require a better identification system. Some acrylics are used on up to 10 different top level assembly part numbers. Which assembly an acrylic will be used on may not be known when the acrylic is machined and thus the top level assembly part number cannot be marked on the acrylic.


Production Date


For units produced between 1997 and May 2007 the date is represented by the last four digits. From June 2007 the format was extended to five digits to accommodate years past 2006. The format is DDMY or DDMYY where:


DD is the day of production, eg 04 = 4th day of the month.

M is the month character code, where A = Jan, B = Feb etc. Note that 'I' is not used so Sept is 'J' etc.

Y is the year between 1997 and 2007, so 9 = 1999, 5 = 2005.

YY is the year between 2007 to date, so 09 = 2009, 20 = 2020



Recent Posts

See All

Removing old screws from a window frame

Materials Boats built 1980's and before may well have chromed brass screws/machine screws which are quite soft, but suffer less galvanic corrosion. Later fastenings are likely to be stainless steel wh

Refitting the refurbished Canpa hatch to Liberte Boo

Avid readers of the blog will be aware that many many moons ago (Aug 2020) I removed the 1980's composite Canpa hatch from my own boat, the Halmatic 30 Liberte Boo (see Blog - Lids4Lend in Practice -