Stanley Block Plane - No. G12-020 / 12-020G

stanley block plane G12-020
Our Rating

Stanley 9 1/2G / 12-020G Review By: I.Ball

Manufacturer: Stanley

Plane Type: Block

Model No: 9 1/2 G / G12-020 / 12-020G


The Stanley block plane number 9 1/2 G / G12-020 / 12-020G is a compact fully adjustable block plane which is ideal for finishing and end grain work.

The Stanley 9 1/2 G / G12-020 / 12-020G has a hooded lever cap with a smooth half dome on top. The face of the lever cap has a knurled pattern, a locking lever and an eye opening for the securing screw.

The 9 1/2 G / G12-020 / 12-020G plane blade rests on a lateral adjuster and a depth adjuster which all rest on the bed.

The lateral adjuster functions with the user moving the adjuster side-to-side. The adjuster is moved by gripping the two folded-over metal grips protruding above the blade and then sliding it sideways. This in-turn moves the blade laterally (sideways).

stanley plane G12-020

There is a brass depth adjuster wheel nut located above the top of the blade and lateral adjuster. This when turned moves the blade forwards or backwards to allow the user to tune the blade to the depth of cut required.

This 9 1/2 G / G12-020 / 12-020G has the added feature of having an adjustable mouth. The mouth is adjusted by swivelling the adjuster wrapped around the brass front knob. The brass knob will need to be loosened slightly before the adjuster will swivel, it will then need to be tightened once the mouth is in position.

The 9 1/2 G / G12-020 / 12-020G also has a thumb / finger imprint grip on the outer edge of both sides of the plane to offer extra grip and therefore control when planing.

The model number of this block plane is discretely inscribed on the side of the plane. It is quite easy / common for the user to not know the model number of this plane and not realise the model number is present, especially if the side of the plane has become stained / grubby.

Plane Construction

stanley block plane G12-020

G12-020 / 12-020G Plane Blade / Cutter

Width: 43mm

Blade Thickness: 2mm

Number of Grooves: 3

Groove Thickness: 2mm

Distance Between Grooves: 4mm

Slot Length: 48mm

Slot Width: 15.5mm

Top Of Blade Shape: Oval, Rounded Corners

Blade Markings: Stanley, Made In England

Manufactured Dates

<1988 - 1990>

stanley block plane G12-020

stanley block plane G12-020

stanley G12-020 block plane

Your Say


Do you have a question/answer or something to share about this tool?
Please Contact Us


(i) This review/article may give warning(s) / advisory notes / cautions / guidelines given in good faith, any such information should not be solely relied upon and seen as the exhaustive list of warnings / advisory notes / cautions / guidelines. Refer to good safety practices for the safety of you and others. Refer to good practices for the good health of your tool and property.
(ii) The details here are given in good faith, the details are constantly growing and evolving including corrections, there is scope for error and shouldn't be fully relied upon, please confirm any details for yourself by performing additional research from reliable sources.

Use Of Content

Enjoy viewing the encyclopedia of tools.

If you are inspired by our content or use info such as dates, sizes, details from please kindly give credit where credit is due via giving a nod in a video or a link to this website.

Please see our terms if using more than a few dates or details.


Your AD Here

Readers Pick

"Just stumbled across your website and an absolute treasure trove of information. I was recently given an old Stanley 110 block plane and wanted to know more about it. Your website told me everything I needed to know.

But there is so much more to read. I forsee me spending a lot of time just reading page after page. I can appreciate how much time this will have taken to put together.

I just wanted to let you know that your hard work is appreciated."

Copyright © All rights reserved