Britool England MDB 3/8" Deep AF 12 Point Socket Range 1/4"-7/8" UK Made

Name: Britool England MDB 3/8" Deep AF 12 Point Socket Range 1/4"-7/8" UK Made
Brand: Britool Hallmark
SKU: MDB375
Price: 8.99 GBP
Availability: InStock

MDB375

Size 1/4"AF 5/16"AF 3/8"AF 7/16"AF 1/2"AF 19/32"AF 5/8"AF 11/16"AF 3/4"AF

£8.99

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The Britool Hallmark MDB Deep AF Socket Range comprises original UK-manufactured 3/8" square drive hand sockets designed for professional automotive, engineering and mechanical applications requiring traditional AF / imperial fastener sizes.

Manufactured from high-quality Boron steel, each socket features a 12-point / bi-hexagon profile together with a deep-reach design, providing additional access to recessed fasteners and nuts positioned on longer threaded studs.

These MDB sockets were manufactured at the original Britool UK production facility before it closed. As remaining stocks are finite, individual sizes from this British-made range are becoming increasingly difficult to source.

Available in AF sizes ranging from 1/4" through to 7/8", these sockets are particularly useful for classic and vintage vehicle maintenance, older machinery, restoration projects and professional workshops continuing to work with imperial fasteners.

Key Features

Genuine Britool Hallmark MDB Range
Original Britool England / UK-manufactured sockets
3/8" square drive
Deep / long-reach profile
AF / imperial socket sizes
Sizes available from 1/4" to 7/8" AF
12-point / bi-hexagon profile
Manufactured from high-quality Boron steel
Ball retaining groove in each face of the square drive
Positive fit with compatible 3/8" drive accessories
Professional hand-tool construction
Ideal for classic automotive and engineering applications
Increasingly rare original British-made tooling
Individual sizes available
Selected sizes available as the MDBSET9 9-piece set

AF / Imperial Size Range

Individual Britool MDB deep sockets are available in selected AF sizes from 1/4" through to 7/8".

Drive: 3/8" Square Drive
Socket Type: Deep / Long Reach
Profile: 12-Point / Bi-Hexagon
Measurement: AF / Imperial
Material: Boron Steel
Series: MDB
Manufacture: England / UK

Availability varies by size due to the age and discontinued nature of this original British-made range.

Please select the required AF size carefully when ordering.

Deep Socket Design

The deep profile provides additional reach compared with a conventional standard-depth socket.

This can be particularly useful when working with:

Nuts positioned on longer threaded studs
Recessed AF fasteners
Engine components
Classic vehicle assemblies
Older machinery
Agricultural equipment
Mechanical and engineering applications

For mechanics maintaining older vehicles and machinery, a dedicated range of deep AF sockets provides useful imperial coverage alongside modern metric tooling.

12-Point Bi-Hexagon Profile

Each MDB socket features a 12-point / bi-hexagon profile for engagement with compatible AF fasteners.

The additional engagement positions can make socket alignment easier in restricted working areas, particularly where there is limited space available to reposition a ratchet or extension.

Always select the correct AF socket size and ensure full engagement with the fastener before applying torque.

Ball Retaining Grooves

Each socket incorporates a ball retaining groove in each face of the 3/8" square drive.

This provides a positive connection with compatible 3/8" drive ratchets, extension bars and hand-tool accessories, helping retain the socket securely during normal workshop use.

Original Britool England Manufacture

These MDB sockets were manufactured at the original Britool UK manufacturing facility before production there ceased.

As a result, the remaining sockets represent increasingly scarce examples of original British-manufactured Britool tooling.

They can be particularly relevant for:

Classic British car mechanics
Vintage vehicle restoration
Classic motorcycle maintenance
Professional automotive workshops
Agricultural machinery repairs
Mechanical engineering
Older industrial machinery
Existing Britool England tool users
Britool tool collectors
Customers replacing missing MDB sockets

Once remaining individual sizes have sold, availability of this original UK-made range may be limited.

Older UK Stock – Manufacturing Variations

Please be aware that these are older UK-manufactured sockets produced across differing manufacturing styles and production periods.

As a result, there may be some variation in finish, markings or general appearance between individual sockets.

These cosmetic and manufacturing variations do not alter the stated socket size or intended hand-tool application and are reflected in the reduced selling price.

This is particularly important for customers purchasing sockets to add to an existing older Britool collection, as an individual replacement may not be visually identical to another MDB socket already owned.

MDBSET9 9-Piece Set Available

For customers requiring a selection of popular AF sizes, selected MDB sockets are also available together as:

MDBSET9 – Britool England 9-Piece 3/8" Drive Deep AF 12-Point Socket Set

The MDBSET9 contains:

1/4", 5/16", 3/8", 7/16", 1/2", 19/32", 5/8", 11/16" and 3/4"

The set is supplied together on a socket rail.

Individual MDB sockets remain available separately according to remaining stock.

Professional Classic Automotive & Engineering Applications

AF / imperial fasteners continue to be encountered across many older vehicles, machinery and engineering applications.

Typical uses for the MDB range include:

Classic British cars
Vintage vehicles
Classic motorcycles
Vehicle restoration
Older engines and machinery
Agricultural machinery
Mechanical engineering
Professional garages
Restoration workshops
Industrial maintenance
General imperial fastener applications

Always establish the correct fastener standard before selecting a socket, as AF, Whitworth and other imperial systems should not be treated as interchangeable solely because they appear similar in size.

Hand Tool Use Only

These are traditional chrome hand sockets designed for use with appropriate manual 3/8" drive tools.

They are not impact sockets and should not be used with:

Pneumatic impact wrenches
Cordless impact wrenches
Electric impact tools
Other powered impact equipment

The Britool Hallmark Range

The Britool Hallmark range was developed by Britool in the 1980s for the automotive aftermarket and has been a long-established choice for professional workshop users.

Each tool carries distinctive Britool Hallmark branding, , providing clear identification and reflecting the professional tooling heritage of the range.

The Britool Hallmark guarantee covers defects in materials and/or workmanship when tools are used for the purpose for which they were designed.

The guarantee does not extend to fair wear and tear or moving parts such as ratchet mechanisms.

Important Information

This listing covers individual Britool MDB sockets in the selected size.
Original Britool England / UK-made tooling.
3/8" square drive.
Deep / long-reach socket profile.
12-point / bi-hexagon design.
AF / imperial sizes from 1/4" to 7/8" subject to remaining stock.
Manufactured from Boron steel.
Older production means appearance and markings may vary between sockets.
Cosmetic/manufacturing variations are reflected in the reduced price.
Complete 9-piece selection also available as MDBSET9.
Designed for hand-tool use only – not impact use.
Product photograph is generic and may show a different size or manufacturing variation.
You will receive the AF size selected when ordering.

Weight & Dimensions

Length: 55 mm

Britool England MDB 3/8" Deep AF 12 Point Socket Range 1/4"-7/8" UK Made

£8.99

Frequently Asked Questions

What are Britool MDB deep AF sockets used for?

Britool MDB sockets are 3/8" drive deep AF / imperial hand sockets designed for recessed fasteners and nuts positioned on longer threaded studs. They are particularly useful for classic British cars, vintage vehicles, motorcycles, agricultural machinery, older equipment and engineering applications where imperial AF fasteners are still commonly encountered.

Are these genuine UK-made Britool sockets?

Yes. These MDB sockets are genuine Britool England sockets manufactured in the UK before original British production ceased. Remaining stocks are finite, making some sizes increasingly difficult to obtain. They can be particularly useful for replacing missing sockets from an existing Britool England MDB collection.

What is the difference between an AF socket and a metric socket?

AF means Across Flats and refers to imperial fastener sizes measured in fractions of an inch, whereas metric sockets are sized in millimetres. Although some AF and metric sizes may appear similar, they should not automatically be treated as interchangeable. Using the correctly sized socket helps provide proper engagement and reduces the risk of damaging older fasteners.

Why would I need a deep AF socket instead of a standard socket?

A deep socket provides additional internal clearance and reach, making it useful where a nut sits further along a protruding threaded stud or where the fastener is recessed within a component. This is particularly valuable when maintaining classic vehicles, engines and older machinery where conventional standard-depth sockets may not provide sufficient access.

Are Britool MDB sockets 6-point or 12-point?

The MDB range features a 12-point / bi-hexagon profile. This provides additional engagement positions compared with a conventional 6-point socket, which can make positioning easier when working in confined areas with limited ratchet movement. Always ensure the correct AF size is fully engaged before applying torque.

Can Britool MDB deep sockets be used with an impact wrench?

No. These are traditional professional 3/8" drive hand sockets and are not impact-rated. They should only be used with suitable manual tools such as hand ratchets, extension bars, sliding T-bars and flex handles. They should not be used with pneumatic, cordless or electric impact wrenches.