Britool Hallmark

Britool England 3/8" Drive AF Socket 12 Point Bi-Hex 1/4"-1" UK Made

  • Britool England 3/8 inch drive AF 12 point bi-hexagon socket range UK made professional imperial hand sockets for classic automotive workshop use
  • Britool England 3/8 inch drive AF 12 point bi-hexagon socket range UK made.
  • Britool Hallmark 3/8" drive UK Made bi-hexagon AF Imperial hand socket range
  • Circular logo with '12-Pt.' text in the center on a white background
  • Circular icon with 3/8" Drive' text on a black background
  • Britool Made in the UK logo
  • Britool Great Britain logo
  • Britool Hallmark Official brand logo
  • Britool Hallmark offical "B" Marque of Skill logo.

MB250

Size
£6.99
£6.99
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The Britool England 3/8" Drive AF Socket Range comprises professional-quality imperial hand sockets originally manufactured at the Britool UK factory and designed for automotive, mechanical and engineering applications.

Featuring a 12-point / bi-hexagon profile, these sockets provide multiple engagement positions around compatible AF fasteners, making them particularly useful where access or ratchet movement is restricted.

The sockets incorporate Britool's Stress Relief Drive design, developed to provide effective torque transfer while helping reduce stress and wear on compatible fasteners.

Manufactured from high-quality alloy steel, each socket also features a ball-retaining groove within the square drive for a secure and positive connection with compatible 3/8" drive ratchets, extension bars and accessories.

As these sockets were manufactured in Britain before the original UK production facility closed, remaining stocks are becoming increasingly difficult to source. They are particularly suitable for professional mechanics, classic vehicle specialists, restoration workshops and Britool enthusiasts requiring genuine British-made AF tooling.

Key Features

  • Genuine Britool England sockets
  • Original UK-manufactured Britool tooling
  • 3/8" square drive
  • AF / imperial sizes
  • 12-point / bi-hexagon profile
  • Britool Stress Relief Drive
  • Manufactured from high-quality alloy steel
  • Designed for professional hand-tool applications
  • Ball-retaining groove for positive accessory connection
  • Suitable for compatible 3/8" ratchets and extensions
  • Useful for restricted-access fasteners
  • Ideal for classic automotive and engineering work
  • Individual socket sizes available
  • Increasingly rare original British-made tools

AF Sizes Available

Available sizes include:

1/4", 5/16", 11/32", 7/16", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16" and 1"

Availability may vary as remaining stocks of these original UK-manufactured sockets are limited.

Drive: 3/8" Square Drive
Measurement: AF / Imperial
Profile: 12-Point / Bi-Hexagon
Material: Alloy Steel
Type: Professional Hand Socket
Manufacture: England / UK

Please select the required AF size carefully when ordering.

12-Point Bi-Hexagon Profile

Each socket features a 12-point bi-hexagon profile, providing additional positioning options around compatible AF nuts and bolt heads.

This can be particularly useful when working in confined areas where there is limited room available to reposition a ratchet.

The profile provides positive engagement when the correct socket size is selected, helping provide controlled torque transfer during professional hand-tool applications.

Britool Stress Relief Drive

The sockets incorporate Britool's Stress Relief Drive system, designed to provide effective torque transfer while helping minimise unnecessary stress and wear on compatible fasteners.

Correct socket sizing remains essential, particularly when working with older, corroded or previously damaged imperial fasteners.

Professional AF / Imperial Applications

AF sockets continue to be important for mechanics and engineers maintaining older vehicles, machinery and equipment manufactured around imperial fastening systems.

Typical applications include:

  • Classic British cars
  • Classic and vintage vehicles
  • Classic motorcycles
  • Vehicle restoration
  • Older engines and transmissions
  • Agricultural machinery
  • Mechanical engineering
  • Vintage machinery
  • Professional restoration workshops
  • Industrial maintenance
  • Existing Britool tool collections
  • General AF / imperial fastening work

For classic vehicle specialists in the UK and worldwide, retaining a comprehensive selection of quality AF sockets can be essential when servicing older British, European and other vehicles using imperial fasteners.

Original Britool England Manufacture

These sockets were manufactured at the original Britool factory in the United Kingdom.

With UK production having ceased, genuine British-made examples are becoming increasingly scarce, particularly in less common AF sizes.

This makes the range useful not only for professional mechanics but also for Britool collectors and existing Britool England tool users seeking replacement or missing sizes from an older socket collection.

Remaining sizes are therefore subject to availability and may not be replaceable once existing stock has sold.

Ball-Retaining Groove

Each socket incorporates a ball-retaining groove within the square drive, helping provide a positive fit with compatible 3/8" square drive hand tools and accessories.

Suitable accessories can include:

  • 3/8" drive ratchets
  • Extension bars
  • Sliding T-bars
  • Flex handles
  • Other compatible manual 3/8" drive accessories

Hand Tool Use

These sockets are designed as professional hand sockets.

They should be used with appropriate manual 3/8" square drive tools and are not intended for pneumatic or powered impact applications.

For impact-tool applications, an appropriately rated impact socket should always be used.

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 is for one individual Britool England AF socket in the size selected.
  • Original UK-manufactured Britool tooling.
  • 3/8" square drive.
  • 12-point / bi-hexagon profile.
  • AF / imperial sizing.
  • Britool Stress Relief Drive design.
  • High-quality alloy steel construction.
  • Designed for professional hand-tool applications.
  • Remaining original UK-made stock is increasingly rare.
  • Availability varies according to size.
  • These are hand sockets, not impact sockets.
  • Product photograph is generic and may show a different size.
  • You will receive the AF size selected when ordering.
Britool England 3/8" Drive AF Socket 12 Point Bi-Hex 1/4"-1" UK Made

£6.99

Frequently Asked Questions

What are Britool England 3/8" drive AF sockets used for?
These Britool England AF sockets are designed for imperial nuts and bolts commonly found on classic British cars, vintage vehicles, motorcycles, older machinery, agricultural equipment and engineering applications. They are particularly useful for restoration workshops and mechanics maintaining equipment manufactured before metric fasteners became widespread.
What does AF mean on a socket?
AF means Across Flats and refers to the distance between two opposite flat faces of a hexagonal nut or bolt head. AF sockets are specified in imperial inch sizes rather than millimetres. Always identify the actual fastener standard and select the correct AF size rather than substituting a similar metric socket.
Are these original British-made Britool sockets?
Yes. These are genuine Britool England sockets manufactured in the UK during the original period of British Britool production. Remaining stocks are limited, making them particularly useful for customers replacing missing sockets from older Britool sets and for enthusiasts seeking original UK-made Britool tools.
Are these Britool AF sockets 6-point or 12-point?
They feature a 12-point / bi-hexagon profile. The additional engagement positions can make it easier to locate the socket onto a compatible fastener and reposition a ratchet where the available working arc is restricted. They also incorporate Britool's Stress Relief Drive design to support effective torque transfer to compatible fasteners.
Can these 3/8" drive Britool England sockets be used with an impact wrench?
No. These are professional hand sockets and are not impact-rated. They should be used with compatible manual 3/8" drive tools such as ratchets, extension bars, sliding T-bars and flex handles. For pneumatic, cordless or electric impact wrenches, always use an appropriately rated impact socket.
Which AF socket sizes are available in this Britool England range?
Current sizes include 1/4", 5/16", 11/32", 7/16", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16" and 1" AF, subject to remaining stock. Because these are original discontinued UK-manufactured Britool sockets, individual sizes may permanently sell out and availability is expected to reduce over time.