M3.5 (3.5mm) A2 Stainless Steel Form A Flat Washer

Form A Flat Washer

Top quality form A stainless flat washer supplied straight from Warrington, UK. These washers are for metric bolts and screws.

M3.5 (3.5mm) A2 Stainless Steel Form A Flat Washers from Specialty Metals offer a variety of benefits to users. It is made from stainless steel 304 grade, making it durable as well as highly versatile, making it ideal for a wide range of applications. Due to its superior hygiene properties, the washer ensures maximum safety standards while remaining easy to maintain. This washer also features excellent corrosion resistance, which further enhances its longevity and reliability. In addition to providing a secure fit, this washer provides users with peace of mind that their equipment and machinery will remain in place. A dependable, low maintenance solution, the M3.5 (3.5mm) A2 Stainless Steel Form A Flat Washer from Speciality Metals won’t let you down.

Form A flat washer are most used around the world.

Key product details:

• Standard – DIN 125A
• Fasteners Type – Form A Flat Washer
• Thread Diameter – M3.5
• Internal Diameter – 3.7mm
• Outer Diameter – 8mm
• Thickness – 0.5mm
• Metal – Stainless steel grade 304 (A2)

Speciality Metals are the best suppliers for you because:

• FREE UK delivery on all orders
• Order dispatch within 24 hours of order
• Located in Warrington, UK which is the UK home of mesh and metals
• Our experienced staff are experts in the mesh market and care personally about your customer experience

Speciality Metals is a trusted UK based distributor of fasteners, sheet metal, flat bar and round tube. We specialise in rapid delivery to any location around the country. Our team of experienced, friendly staff are at hand at all times to process your order.

FAQs About This Product

Can I Use Form A Washers in a Saltwater Environment?

Stainless steel 304 is an austenitic stainless steel alloy commonly used for various applications due to its good corrosion resistance and ease of fabrication. However, it is not the best choice for highly corrosive environments like saltwater. This is due to the fact that the presence of chlorides in the saltwater can lead to pitting and crevice corrosion in stainless steel 304 over time.

For marine or saltwater applications, a more corrosion-resistant stainless steel like 316 is often recommended. Stainless steel 316 contains molybdenum, which significantly improves its resistance to pitting and crevice corrosion in chloride environments.

If you use 304 stainless steel washers in a saltwater environment:

1. You should expect a reduced lifespan for these components.
2. Regular maintenance and inspection would be necessary to check for signs of corrosion and to replace corroded parts.
3. You may need to employ additional protection methods, like special coatings or cathodic protection, to extend the lifespan of the washers.

Are Stainless Steel Form A Washers Corrosion-Resistant?

Stainless steel 304 does have a level of corrosion resistance due to its chromium content, which forms an oxide layer on the surface when exposed to air. This oxide layer helps to protect the underlying material from corrosion to some extent. However, “corrosion-resistant” does not mean “corrosion-proof.”

The extent to which 304 stainless steel is “corrosion-resistant” depends on the environment it is placed in. In many indoor or mild outdoor environments, stainless steel 304 performs well without significant corrosion.

However, it is less resistant to corrosion in environments that are:

• Acidic
• Rich in chlorides (like saltwater)
• High in both temperature and humidity
• Exposed to certain aggressive chemicals

In such conditions, the protective oxide layer may break down, allowing for corrosion mechanisms like pitting, crevice corrosion or general corrosion to occur.

How do Form A Washers Compare to Form B, C or D Washers?

The designations “Form A,” “Form B,” “Form C,” and “Form D” refer to different types of flat washers, each with specific dimensions and intended applications. These forms are standardised dimensions that dictate factors such as the washer’s internal and external diameters, as well as its thickness.

Form A Washers:

• Application: General-purpose applications; used with metric bolts.
• Features: These are often thicker and have a larger outer diameter relative to the inner diameter when compared to other forms.
• Material: Can be made from various materials, including steel, stainless steel and more.

Form B Washers:

• Application: Lighter-duty compared to Form A, used in applications where less strength is needed.
• Features: Generally thinner and have a smaller outer diameter relative to the inner diameter compared to Form A.
• Material: Can also be made from various materials.

Form C Washers:

• Application: These are most commonly used in the United Kingdom and are similar to Form A but with smaller outer diameters.
• Features: Thicker and suitable for heavy-duty applications, but the outer diameter is smaller than Form A washers.
• Material: Variety of materials, just like Forms A and B.

Form D Washers:

• Application: Lighter-duty applications; mostly used in the United Kingdom.
• Features: Similar to Form C but thinner.
• Material: Can be made from a variety of materials.

Do I Need Special Tools for Installing Form A Flat Washers?

Form A flat washers are generally straightforward to install and do not usually require specialised tools. These washers are used to distribute the load of a threaded fastener, such as a screw or nut, more evenly over the surface of the material you are fastening. Here are some common tools that you may need for installing Form A flat washers:

1. Wrench or Socket Set: To tighten or loosen nuts or bolt heads.
2. Screwdriver: If you are using screws instead of bolts.
3. Pliers: Sometimes helpful for holding a nut in place.
4. Ratchet Set: For quicker tightening and loosening.
5. Torque Wrench: For applications that require specific torque settings.
6. Hammer: In some cases, you might need a hammer for tap-tight fits, although this is generally not recommended as it can deform the washer or the fastening material.
7. Drill and Bit Set: If pre-drilled holes are not available and you need to create your own.
8. Gloves and Safety Glasses: For personal protection.

The process for installing flat washers typically goes as follows:

1. Place the Washer: Place the flat washer over the hole where the screw or bolt will go through.
2. Insert the Fastener: Insert the screw or bolt through the washer and into the hole.
3. Add a Second Washer (optional): Sometimes, a second washer is added on the other side of the material for added load distribution.
4. Tighten the Nut: Place a nut on the threaded end of the bolt (if using bolts) and tighten using appropriate tools.

Check out our blogs discussing Stainless Steel Form A Washers. It will prove a useful read to help you to make an informed decision on which material would work best for you. 

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