Allen Key Bolts

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Allen key bolts, also known as socket head cap screws, are widely used in engineering, manufacturing and construction where a strong, compact and precise fixing is required. Their internal hex drive allows high torque to be applied while maintaining a clean and space-saving head profile.


At Duchy Fasteners, a comprehensive range of allen key bolts is held in stock to support professional trade use and specialist applications. Customers can purchase directly from the trade counter or order online for fast UK delivery, ensuring reliable access to quality fasteners when accuracy and strength matter.

What Is an Allen Key Bolt?

An allen key bolt is a bolt with a hexagonal socket in the head, designed to be tightened using an allen key or hex key. This internal drive allows the bolt head to sit flush or proud with a neat finish, making it ideal for confined spaces and precision assemblies.


Allen key bolts are commonly manufactured as socket head cap screws and are valued for their high strength, clean appearance and ability to apply controlled torque. They are widely used where external hex heads would be impractical or where a low-profile fixing is required.

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Allen Key Bolts Held in Stock

Duchy Fasteners stocks a practical range of allen key bolts to meet the needs of engineering, fabrication and maintenance work.

The range includes:


  • Socket head cap screws

  • Allen key bolts in multiple lengths and diameters

  • Matching nuts where required

  • Washers suitable for socket fastener applications

These fasteners are available in a selection of materials and strength grades, allowing customers to specify bolts based on environment, load and application requirements.

Materials and Grades Available

Allen key bolts are commonly specified in environments where strength and precision are critical. Duchy Fasteners stocks socket head bolts in materials suitable for both internal and external use.


Options include corrosion resistant stainless steel for damp or exposed environments and high tensile steel for applications requiring increased load bearing performance. High tensile grades are particularly popular in machinery, automotive and structural assemblies where reliability under stress is essential.


This range ensures customers can select allen key bolts that meet both mechanical and environmental demands.

Typical Uses for Allen Key Bolts

Allen key bolts are used across a wide range of applications due to their strength and compact design.


Common uses include machinery assembly, automotive components, engineering fabrication, structural frames, equipment maintenance and workshop builds. Their internal drive makes them ideal for applications where space is limited or where a smooth external finish is preferred.


They are also widely used in applications where fasteners may need to be removed and refitted without damaging the head.

Strength and Performance Benefits

The design of an allen key bolt allows higher torque to be applied compared to many traditional bolt types. This results in strong clamping force and reliable joint integrity.


High tensile socket head cap screws are particularly effective in applications subject to vibration or repeated loading. When specified correctly, allen key bolts provide long term performance with reduced risk of loosening or failure.


Correct sizing and grade selection are essential to ensure safe and reliable results.

Trade Counter Supply in Cornwall

Customers can purchase allen key bolts directly from the Duchy Fasteners trade counter at Cornwall Business Park. This allows trade professionals to inspect products, confirm sizes and collect fasteners immediately.


The trade counter is ideal for urgent jobs, workshop requirements and ongoing engineering projects where correct specification is critical. Knowledgeable staff are available to assist with selecting suitable socket head bolts where required.

Online Ordering and UK Delivery

Allen key bolts are also available to order online with courier delivery across Cornwall and the rest of the UK. This service supports customers managing projects remotely or working across multiple sites.


Online access to the same extensive stock range ensures consistent availability for repeat orders and national supply needs.

Why Choose Duchy Fasteners for Allen Key Bolts

Duchy Fasteners specialises in fixings and fastenings rather than general building supplies. This focus allows the business to stock deeper ranges of specialist fasteners such as allen key bolts.


Customers choose Duchy Fasteners for reliable stock, multiple material and grade options and flexible purchasing through local collection or online delivery. This makes it a dependable supplier for precision fasteners used in demanding applications.

FAQs About Allen Key Bolts

What is another name for an allen key bolt?

They are commonly known as socket head cap screws or hex socket bolts.

What are allen key bolts used for?

They are used in engineering, machinery, automotive and structural applications where high strength and compact design are required.

Are allen key bolts high tensile?

Many allen key bolts are manufactured in high tensile grades suitable for load bearing applications.

Can I buy allen key bolts locally in Cornwall?

Yes, allen key bolts are available from the Duchy Fasteners trade counter in Scorrier.

Do you deliver allen key bolts across the UK?

Yes, allen key bolts can be ordered online and delivered nationwide.

How Does This Affect Your Project?

Choosing the correct allen key bolt ensures strength, accuracy and long term reliability in demanding assemblies. By sourcing socket head cap screws from Duchy Fasteners, customers gain access to specialist stock, correct grades and dependable supply.


Whether for engineering, fabrication or maintenance work, Duchy Fasteners provides allen key bolts that deliver precision fastening where it matters most.