We supply HiFluor® O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Hifluor is Parker’s tradename for high performance fluoroelastomers materials that “bridge the gap” between traditional fluorocarbon and perfluoroelastomer.

Factors to Be Considered for Optimum Cutting Speed ; Aluminum, 400-1000 ; Brass, 225-300 ; Bronze, 150-225 ; Cast Iron, Soft, 100-150 ...

Feb 9, 2008 — Some cast irons can be extremely hard and quite difficult to machine, others are almost like machining cheese, and are great to work with except for the dust.

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NSF 61 Drinking Water System Components - is the nationally recognized health effects standard for all devices, components and materials which contact drinking water. Parker’s O-Ring Division has developed several materials that are certified to NSF 61. Many of these materials are approved for use in the United Kingdom (WRAS), and Germany (KTW) as well as North America. NSF International is an industry regulating agency that was established in 1944. Recognized by ANSI (American National Standards Institute), NSF maintains qualification standards and criteria for a wide range of products, including potable water components and delivery systems.

It is not uncommon to find screw heads that have been incorrectly placed, causing them to stick out from the surface. Not only is this unsightly, but the protruding screw heads can also be dangerous, as it can result in a severe cut or scratches.

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Coatings, such as titanium-aluminium nitride (TiAlN), are highly versatile and widely used. Titanium, aluminium, and nitrogen make up TiAlN as a compound. As a result, heat and oxidation are not a problem for the coating, making drilling faster.

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Place your order online and receive order confirmation and shipping updates99% of our products are despatched same day from stock.

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Oct 18, 2021 — Silver Engineering Works is an experienced full service stainless steel machining shop, providing quality machined parts for over 80 years.

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201079 — When milling or drilling 304 stainless steel: 1)What type of cutters do you recommend? 2) cutting speed? RPM? and/or Feed? 3) depth of cut?

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Wearing safety glasses or goggles can protect your eyes from flying chips, debris, and other eye-threatening hazards. Gloves prevent your hands from being cut by sharp components, chips, or sharp edges that are produced during the drilling process

To avoid any movement during drilling, make sure the metal is completely secured. Keep the metal sheet in place during drilling by putting clamps on its sides. Movements can cause the hole to become out of alignment, which will degrade its quality.

HSS is a popular material for drill bits because of its hardness and excellent wear resistance. It is possible to drill faster and is suited to more robust materials with these properties.

These H2S Sour Gas resistant O-Ring materials are designed to outperform standard materials significantly extending sealing life in some applications. Materials are compliant to NORSOK and other indipendant H2S sour gas O-Ring performance standards.

You want to make sure the screwhead is flush with the metal. Make that the depth stop adjuster is set to at least 4 mm or more, depending on the size of the screw or bolt head. This will allow you to precisely drill your hole. This will prevent the screw head from protruding or countersinking excessively, hence preventing a gap from forming on top of the screw head.

We supply Viton® O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Viton® O-Ring and seal performance cost benefit makes it the second most popular sealing material. Fluoroelastomer (Viton®, FKM) offers a wide range of resistance to chemicals, oil and heat, with situational service life above 200°C. The outstanding heat stability and excellent resistances are due to the high ratio of fluorine to hydrogen, the strength of the carbon-fluorine bond, and the absence of unsaturation. FKM compounds are widely used in chemical, automotive, aerospace and industrial applications.

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All orders placed before 5:00pm Monday to Thursday and 3:00pm Friday will be dispatched on a next day carrier service. Carriage is free on all orders over £50 (Excluding VAT), if below £50 then next day delivery is £6.50

Countersinking is used to ensure that flat  head screws or fasteners sit flush against the workpiece. Countersinking is used, to make conical holes that match the angled contour on the bottom of flat head screws with conical heads.

We supply Fluorosilicone O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Fluorosilicone is a widely used elastomer that can be compounded to meet a wide range of applications. The mechanical and physical properties are very similar to silicone rubber. However, fluorosilicone offers improved fuels and mineral oil resistance but poor hot air resistance when compared with silicone. This material is widely used in semiconductor Ashing equipment for its resistance to oxygen plasma.

Carbide is the hardest drill bit material and has the longest lifespan. Steel drill bits with carbide tips are the most common material used to make carbide drill bits. They are the best countersink drill bits and are used for hard-to-drill materials like steel and in drilling larger holes.

Titanium nitride, or TiN, titanium is a corrosion-resistant metal used to coat HSS drill bits to increase their surface hardness. Designed for drilling through rigid material, TiN drill bits are superior to standard HSS bits in terms of durability. They can be easily identified with their rich gold hue coating.

This is also called a "zero flute" countersink. One distinguishing aspect of this countersink is the drill hole running the length of the cone's side. The tool's cutting edge is formed by the intersection of the hole and cone.

Here at Quality Tools UK, we offer only the best-quality drilling tools, so you are guaranteed to find the right countersinking tools for your next metal project. If you're still unsure which drill bits suit your needs, feel free to reach out to one of our specialists.

As a result, the screw and the metal form a robust and secure connection. The screw can then be positioned flush with the surface of the metal thanks to the countersink bits’ "V" form. The heads of the screws will lie flush or slightly below the surface when fully tightened.

Using a key that is designed to fit into an open hole on the chuck, you can tighten the collar. The bit shaft should be secured in the vise's collar by rotating the collar. Make sure it isn't too tight so that you can still easily remove it once you are done drilling.

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A fixed guide is located at the tip of the rod, and is typically placed into the pre-drilled hole. This guarantees that the drilling equipment is guided steadily and precisely. The cutting edges also remove material from the workpiece and create space for the cylindrical screw head.

The temperature ranges presented on this page are approximations for dry air service only and should not be used to determine design specifications or end-use temperature limits. Actual temperature range of a compound in an end-use application is highly dependent on part type, hardware configuration, applied forces, chemical media, pressure and thermal cycling effects, and other factors. The most practical way of determining an end-use temperature range is testing in the actual application conditions. Consult a Marco Engineer for more details.

ParkerO-ring groove Calculator

ParkerO-Ring calculator

We supply Aflas® O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Aflas® (TFE/P) Rubber exhibit excellent chemical, heat and steam resistance. They provide superior performance in water, steam and virtually all caustics making them ideal for pharmaceutical and biotechnology manufacturers that use steam and caustic chemicals in the sterilization process. TFE/P provides excellent performance in SIP (steam in place), CIP (clean in place) and WFI (water for injection) applications. TFE/P is widely used in the oil exploration and drilling industry due to its excellent steam and H2S resistance.

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We supply Butyl O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Butyl has great chemical resistance and low permeability but not typically recomended in O-Ring and seal applications due to poor short term rebound.

We supply Parofluor O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Perfluoroelastomers (FFKM, Kalrez®, Markez®, Chemraz®, Parofluor) deliver ultimate chemcial and high temperature resistance, but with a very high cost relative to traditional rubber elastomer sealing materials. Dozens of specialized formulations have been developed to maximize performance in specific application situations like improved low temperature, acid, amines, plasma, steam, food and medical grade, high pressure and explosive decompression resistance.

We supply Neoprene® O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Neoprene® was the first synthetic rubber created with good general resistance. O-Rings are not typically recomended in many applications since newer materials often deliver better performance vs cost value.

Rapid Gas Decompression also known as Explosive Decompression failure in O-Rings is identifiable by surface blisters, pits or pocks. It is caused by absorption of gas at high pressure and the subsequent rapid decrease in pressure. The absorbed gas blisters and ruptures the elastomer surface as the pressure is rapidly removed. These NORSOK compliant O-Ring materials are designed to outperform standard materials significantly extending sealing life in some applications.

Start drilling with moderate speed and pressure. This will keep your drill bit cool and avoid premature dulling.  Apply lubricants once in a while.  It is recommended to apply drilling lubricants on a regular basis.  Turn off your drill as soon as you've achieved the desired depth.

We supply Silicone O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. The term silicone covers a large group of materials in which vinyl-methyl-silicone (VMQ) is often the central ingredient. Silicones are excellent seal materials for extreme temperature in static applications. Outstanding flex and fatigue life, very good for ozone and UV radiation, insulating properties, and physiologically neutral. Silicones can be synthesized with a wide variety of properties and compositions.

Underwriters Laboratories maintains a list of tested and approved materials for a variety of specific uses. The following charts presents the Parker O-Ring materials that are UL Listed .

We supply Nitrile Buna-N O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Nitrile, also commonly referred to as Buna-N or NBR, is a copolymer of Acrylonitrile and Butadiene. Nitrile is the most commonly used elastomeric material for molded and extruded products. This material offers relative low cost, good mechanical properties, and resistance to many common oils, fuels and lubricants. NBR has poor resistance to weathering, sunlight and ozone so it is best used in enclosed environments where parts are not exposed to the elements. Hydrogenated versions of NBR (HNBR) have enhanced mechanical properties as well as greater thermal and chemical stability. Specific physical properties and chemical resistances vary by compound formulation.

Zero-flute countersinks are ideal for deburring and countersinking softer materials, such as aluminium, wood, or plastic to make a countersunk screw hole. They are also suitable for the installation and design of glass, windows, and door frames.

We supply Polyacrylate O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Polyacrylate is a transmition fluid specialy material.

When a drill bit is spinning, it is held in place by a drill chuck. It has a three-way vice and a tightening collar. Drill chucks can be tightened by hand or with a chuck key or chuck wrench, depending on their design.

We supply EPDM O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Ethylene-Propylene based elastomers make up a family of synthetic rubbers characterized by excellent chemical and thermal resistance. These materials can be compounded in a variety of ways for use in a wide range of demanding applications. Ethylene-Propylene elastomers are most commonly available as EPR, a copolymer of ethylene and propylene, and EPDM, a terpolymer. EPR and EPDM have very similar properties and the abbreviations are often used interchangeably. EPDM can be cured with either Sulphur or Peroxide. Sulphur curing is less expensive and easier to process but the product may be tacky and can exhibit some bloom. Peroxide curing is more difficult to process but provides better chemical, thermal, and aging resistance.

NBR can be compounded for enhanced oil and fuel resistance, increased temperature flexibility, high hardness and extrusion resistance, low compression set, and a variety of other attributes. The physical properties of the compound largely depend on the Acrylonitrile content of the formulation. For example, high Acrylonitrile content causes increased oil and fuel resistance while adversely affecting low temperature flexibility and compression set resistance. It is important to consider the offsetting attributes when selecting an NBR formulation. Please contact a Marco Rubber engineer for assistance finding the best compound for your application.

In addition to the standard cylindrical shank and the Morse taper bit shank, the 3-face shank is also available. Tool slippage is reduced thanks to these various shank designs.

Drill bits made with Cobalt-infused High-Speed Steel (HSS) have an increased toughness compared to standard HSS drill bits.

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We supply Ethylene Acrylate VAMAC® O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Polyacrylate is a transmition fluid specialy material utilized in lower temperature applications with risk of slightly more swelling compared to Polyacrylate.

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A countersink drill bit, also known as a fluted countersink, is a specially designed drill bit that creates a region in the metal that corresponds to the shape of the screw head - which is countersunk. The "V" or conical shape created by the countersink drill bit enables the screw to contact the material on both  sides of the screw.

To ensure the screw can be secured correctly, you need to make sure that you have the right countersink angle. For example, a 90-degree countersink is used with metric screws, while an 82-degree countersink is used with standard screws.

The information on this page is to the best of our knowledge accurate and reliable. However, Marco Rubber makes no warranty, expressed or implied, that parts manufactured from this material will perform satisfactorily in the customer's application. It's the customer's responsibility to evaluate parts prior to use.

Compared to fluted countersinks, flat countersinks have a more cylindrical shape. Flat countersinks are used to create countersinks for cylinder head screws, hexagon head screws, and nuts.

We supply Epichlorohydrin O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Epichlorohydrin is a special-purpose seal material with good resistance to both refrigerant gases and gasoline, as well as inherent resistance to atmospheric ozone.

If you're still unsure which drill bits best suit your needs, feel free to reach out to one of our specialists, or Please feel free to browse our collection of countersink drills.

The diameter of your drill bit is critical because it will determine how well the screw will fit into the hole when you are finished drilling it. Make sure that the diameter of the drill bit is approximately the same size as the head of the screw or bolt you intend to use. This will ensure that the screwhead is snugly fitted into the countersink hole. As a result, screwheads will not protrude above the surface of the metal.

In terms of lubricity, black oxide is superior to a bright finish. Countersink drill bits with a black oxide coating last 50% longer with additional heat treatment compared to an ordinary HSS.

Countersink drill bits are available in a wide range of angles, each of which has a distinct purpose. Here are the most popular types of countersink angles according to the type of application used.

Remove the drill bit and check if the countersunk screw or bolt is flush with the countersink hole. The head should fit snugly on the hole and it should then be placed slightly below the surface of the metal.

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Additionally, if these screws can't be tightened all the way, items may get caught on the head of the screw. Countersinking your hole before inserting the screw is one way to avoid this problem in the future.

The Food and Drug Administration (FDA) has established a list of rubber compounding ingredients which tests have indicated are neither toxic nor carcinogenic. Rubber compounds produced entirely from those ingredients and which also pass the FDA extraction tests are said to "meet the FDA requirements". The FDA does not approve rubber compounds. It is the responsibility of the manufacturer to compound food grade materials from the FDA list of ingredients and establish whether they pass the necessary extraction requirements. Similar standards are established by the United States Department of Agriculture (USDA). Additional requirements have been imposed upon seal manufacturers regarding food and beverage service. Parker has developed several materials that are certified to NSF 51, Food and Beverage Standard. In critical medical applications, seals often must be made from an even "cleaner" list of ingredients. The U.S. Pharmacopoeia (USP) Class VI outlines requirements for system toxicity and intracutaneous toxicity for these "cleaner" compounds. The USP Class VI compounds must be made from ingredients with clear histories of biocompatibility that meet tighter requirements for leachates. Typical applications for our FDA, NSF 51, USDA materials are disposable medical devices, surgical instruments and medical fluid dispensing components, as well as a wide variety of food and beverage handling equipment. The type of approval/certification required generally rests with the end customer's regulatory expectations for the specific application.

This type of drill bit typically contains three flutes to ensure a smooth flow when countersinking. The conical shape produces deburring or countersinking in the current drill hole. This is done to allow the correct placement for a countersunk head screw.

We supply Polyurethane O-Rings from Parker Seals and many other world-class manufacturers so please ask which offers the best value for your situation. Polyurethane is an organic polymer. Polyurethanes are formed by reacting a polyol (an alcohol with more than two reactive hydroxyl groups per molecule) with a diisocyanate or a polymeric isocyanate in the presence of suitable catalysts and additives. Polyurethane is a widely used compound due to its superior strength, tear and abrasion resistance. Polyurethane also provides excellent permeation resistance.