Black Stainless Steel Spring Washers

FranksFasteners.co.uk is a small, family-run online business based in the UK, dedicated to providing a wide range of fasteners in various sizes, threads, materials, and pack quantities. Our inventory continues to grow as we work toward becoming one of the UK's leading online fastener suppliers.

We supply fasteners in a huge range of sizes and pack quantities, our range is constantly increasing as we strive to become one of the top fastener suppliers online.

We are proud to have served thousands of customers both domestically and internationally, supporting businesses across diverse industries such as automotive, television and film, aerospace, and manufacturing.

If you have specific requirements and cannot find the products you need in our eBay shop, please feel free to contact us via eBay message or call our Customer Care team on 01691 434 335.

Payment

We accept payment via Credit card, Debit card, Apple Pay, Google Pay, and PayPal.

Delivery in the United Kingdom

We aim to dispatch orders on the same working day when ordered by 2.30pm via Royal Mail. You will have the option to upgrade delivery to Tracked, Special Delivery or Courier at checkout.

With 1st Class, Royal Mail aim to deliver in 1-2 working days. Please note that the delivery date given to you by eBay is an estimate only and delivery may take longer. If you have not received your order we kindly ask you to wait 7 working days as 99.5% of orders are received in this timeframe.

International Delivery

We dispatch orders via eBay's Global Shipping Programme where eBay calculate the price of postage and taxes to your country.

To see if the Global Shipping Programme ships to your country, please visit the eBay help centre or contact their customer support.

Returns

We offer a 30 day returns policy from the date of purchase. If for any reason you’ve changed your mind after your purchase or you require a different size product, we’re happy to work with you to return the item.

If you would like to return your order for a refund, you can open a return request. You'll need to send it back within 10 working days, using tracked postage. Adding tracking details to your return helps protect against delays or issues in the refund process.

Thread Diameter

For most types of fasteners, the diameter is measured across the outside of the threads. In the US, diameters smaller than 1/4" are typically expressed as numbers (e.g., #10) instead of inches, arranged in order of increasing size. Detailed size information can be found using the THREAD TABLE tab.

To ensure accuracy, it’s recommended to use a caliper for precise measurements.

Using a ruler to measure threads can lead to inaccuracies due to optical errors. For instance, if you measure a thread with a ruler and it appears to be 5mm it will actually measure around 5.8mm or 5.9mm with a caliper for an M6 size.

An easy way to confirm the size of a fastener is by checking the Allen key size, the diameter of the head, or across-flat dimensions, as most fasteners adhere to standard specifications. If you require assistance, please don’t hesitate to contact us.

Length

Fastener length is measured from where the material is assumed to be to the end of the fastener. Thus, Countersunk fasteners are measured overall and non-countersunk fasteners are measured from under the head.

Thread Count & Thread Pitch

Machine threaded fasteners specify a thread density in Threads Per Inch (US) or as a Thread Pitch in mm (Metric)

Getting the correct fasteners

Matching fasteners is important.

This 3/8" Hex Bolt has 16 Threads Per Inch which indicates it is a UNC Thread. You will need to find the matching 3/8" Nut with 16 TPI.

Stainless Steel

Stainless Steel offers good corrosion resistance, making it suitable for outdoor use and marine applications, but is more expensive than Zinc Plated.

Fasteners in grades A2 and A4, tend to be amongst the most popular ones across global markets. Grade A2, or as commonly known as 304 Stainless Steel is highly valued for its economical cost and delivering a good performance. Likewise, grade A4, or as known as 316 Stainless Steel is referred to as marine grade stainless steel. Due to its resistance to seawater and brine solutions, A4 screws work well in marine engineering applications.

Zinc Plated Steel

Zinc-plated steel is a type of low carbon steel that has been coated with a layer of zinc. This plating process is commonly used to provide several benefits to the steel, making it suitable for various applications.

It's important to note that while zinc plating does provide corrosion resistance, it may not be suitable for applications exposed to highly corrosive environments or extreme weather conditions. In such cases, more robust coatings, such as galvanization or stainless steel, may be necessary. Zinc-plated steel is a practical choice for indoor or dry conditions where moderate corrosion resistance and affordability are essential.

Brass & Bronze

Brass and Bronze are copper alloys with good corrosion resistance. More expensive than steel, these materials are typically used for decorative applications.

Alloy Steel

Alloy steel is a type of steel that contains additional alloying elements, such as chromium, molybdenum, nickel, or vanadium, in varying proportions to enhance specific properties. These alloying elements can significantly increase the hardness, strength, and other mechanical properties of the steel. Alloy steel typically offers limited corrosion resistance, and it is often treated with coatings to mitigate corrosion.

if corrosion resistance is a significant concern, other materials like stainless steel or coated alloys should be considered to ensure long-term durability in challenging environments.

Grade/Class & Fastener Strength

Fastener Grade (US) or Class (Metric) refers to the mechanical properties of the fastener material. Generally, a higher number indicated a stronger, more hardened (but also more brittle) fastener.

For more information regarding materials please visit our website.