OPEN/WIRING RUBBER GROMMET

Product Details

Wiring grommets are indeed important components used to protect wires and cables when they pass through sharp-edged holes in sheet metal, panels, and metal plates. They are typically made from rubber or other flexible materials such as silicone or PVC, and they serve several key functions in electrical and electronic applications:

  1. Protection from Sharp Edges: The primary function of wiring grommets is to shield wires and cables from the sharp edges of the holes or openings they pass through. This protection prevents the wires from chafing, fraying, or otherwise being damaged due to contact with rough or jagged surfaces.

  2. Sealing and Insulation: Wiring grommets create a strong seal around the opening, preventing the ingress of dust, dirt, moisture, or other environmental contaminants. This sealing action helps maintain the integrity of the electrical or cable connection and minimizes the risk of short circuits or other issues.

  3. Strain Relief: Wiring grommets provide a mild level of strain relief by gripping the wires or cables in place as they pass through the hole. This prevents excessive bending or tension on the wires, reducing the risk of damage due to stress.

  4. Flexibility: Grommets are designed to be firm yet flexible, which allows them to be bent or compressed during installation. This flexibility makes it easier to insert wires or cables into the grommet and position them properly within the opening.

  5. Vibration Dampening: In some applications, wiring grommets can also serve as vibration dampeners, reducing the transmission of vibrations from the surrounding structure to the wires or cables. This is particularly important in automotive and machinery applications.

Wiring grommets come in various sizes and shapes to accommodate different wire and cable diameters and hole sizes. They are commonly used in automotive wiring, electronics, industrial equipment, and other applications where wires and cables need protection and management as they pass through panels, chassis, or enclosures. Properly installed grommets can help ensure the long-term reliability and safety of electrical systems.

Open Grommet Spec

 Size A B C D E
6mm 6.4mm 1.6mm 4.8mm 3.8mm 8.5mm
9mm 9.3mm 1.6mm 7.7mm 6mm 13.4mm
12mm 12.3mm 1.6mm 9.5mm 6.4mm 16.2mm
16mm 15.8mm 1.6mm 12mm 5.9mm 19mm
20mm 20.2mm 1.6mm 15.8mm 6.2mm 23mm
25mm 25mm 1.6mm 19.5mm 7.3mm 29.2mm
Technical SpecifIcation
Rubber
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Frank's Fasteners is a family run business, established late 2020.

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.

Our website and eBay shop has been established to enable our many regular, as well as new, customers to purchase the fasteners they need without having to wait.

If you have a particular requirement or an item is currently out of stock, please feel free to contact us via eBay message, and we'll do all we can to help.

Payment

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

Pay

Delivery in the United Kingdom

We aim to dispatch orders on the same working day when ordered by 2.30pm via Royal Mail 24. You will have the option to upgrade delivery to next day Special Delivery by 1pm.

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.

The Global Shipping Programme ships to the following countries; Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Gibraltar, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Antigua and Barbuda, Aruba, Australia, Bahamas, Bahrain, Bangladesh, Barbados, Belize, Bermuda, Bolivia, Brazil, Brunei Darussalam, Cambodia, Canada, Cayman Islands, Chile, China, Colombia, Costa Rica, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, French Guiana, Grenada, Guadeloupe, Guatemala, Guernsey, Honduras, Hong Kong, Iceland, Indonesia, Israel, Jamaica, Japan, Jersey, Jordan, Kuwait, Liechtenstein, Macau, Malaysia, Maldives, Martinique, Mexico, Monaco, Montserrat, New Zealand, Nicaragua, Norway, Oman, Pakistan, Panama, Paraguay, Peru, Philippines, Qatar, Reunion, Saint Kitts and Nevis, Saint Lucia, Saudi Arabia, Singapore, South Africa, South Korea, Sri Lanka, Switzerland, Taiwan, Thailand, Trinidad and Tobago, Turks & Caicos Island, UAE, Ukraine, Uruguay, USA and Vietnam.

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 on the outside of the threads. (Note: US diameters under 1/4" are given as numbers (e.g #10) instead of inches, in order of increasing size. Information on sizes can be found using the THREAD TABLE tab.

To get an accurate size, a calliper should be used.

Thread

When measuring with a ruler, your eyes will not correctly measure the threads providing you with a wrong diameter. For example, you will see 2mm on a ruler but if measured in a caliper will be 2.8/2.9mm for a M3 size.

A easy way to confirm a size is by looking at what Allen Key size is used or diameter of head/across flats etc as most fasteners are made to a standard. If you need any help, please 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.

Length

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.

Measure

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.

PITCH (MM) THREADS PER INCH (TPI)
 Size CoarseFineExtra FineUNCUNBUNFBSWBSF
M1.6-#00.35----80--
M2-#10.4----72--
--#2---56-64--
M2.5-#30.45--48-56--
--#4---40-48--
M31/8"#50.5--40-4440-
M3.5-#60.6--32-40--
M4-#80.7--32-36--
M53/16"#100.8--24-322432
--#12---24-28--
M61/4"-1--20-282026
M85/16"-1.251-18-241822
M103/8"-1.51.25116-241620
-7/16"----14-201418
M121/2"-1.751.51.2513-201216
M149/16"-21.5-12-181216
M165/8"-21.5-11-181114
M18--2.51.5------
M203/4"-2.51.5-10-161012
M227/8"-2.51.5-9-14911
M241"-32-8812(14)810

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.

Strength Chart

Strength Chart Imperial

For more information regarding materials please visit our website.

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