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The Best 4 Inch Diameter of 2023 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best 4 Inch Diameter of 2023. Check our ranking below.

2,089 Reviews Scanned

Rank No. #1
FixtureDisplaysยฎ Clear Acrylic Tube 4" (Nominal) Diameter (3.937" Exact Outside dim) x 6" Long, 5/64" (2mm) Wall Open Ended 15139-6"-1PK-NPF
  • FixtureDisplays Clear Transparent Plexiglass Acrylic Tube 4" (101mm) diameter x 6" (152mm) long, 5/64" (2mm) Wall Thickness. Made from high quality acrylic. Great clarity.
  • Easy to work with, can be saw cut, drilled, painted, lasered, glued, and heat formed. Use in any DIY projects such as industrial, science, plumbing, design, models, aquariums, crafts, and much more.
  • Overall measures 6" long, 4" outside diameter, 5/64" (2mm) wall thickness. Weight is 0.26 lbs.
  • To purchase acrylic glue please follow this asin: B08T8ZC1FJ. For clear acrylic disc: B07L61X48Y. For clear acrylic sheets: B01IUT4I7I. Recommend FixtureDisplays acrylic glue solvent based plexiglass cement item number 11310. Asin is: B08T8ZC1FJ
  • Diameter and length measurements are nominal. If your needs are scientific and requires high precision, please contact us prior to making your purchase. Exact diameter is 99.9998 mm (3.937 inch). If your requirement is precise, contact us prior to your purchase.
Rank No. #2
MyLifeUNIT 3 Way Duct Connector, Duct Splitter for Exhaust Fan Dryer Vent Hose, 4 Inch Dia. (Y Shape)
  • The duct connector is a three-hole connector with two branches. With the dryer vent connector can be connected to exhaust fans, dryer vent covers and vent seals.
  • Made of premium ABS plastic, it is a material with high strength, good toughness and easy processing, no heavy metals. It can be used outdoors and indoors, even if it is exposed to the sun and rain.
  • The interior of the duct splitter is smooth, and its reasonable curvature greatly reduces the wind resistance. At the same time, it can discharge air from each part of the ventilation project.
  • The dryer duct connector is seamlessly connected to achieve a good leakproof effect. Don't worry about leaking air after installation. It is small in size, so it doesn't take up space.
  • Dryer vent hose has a diameter of 3.7 inches (95 mm ) per interface, suitable for hoses of 4 inches (100 mm). Wipe the tee when using it, then dock it with the hose and fix it with aluminum foil tape. Finally, install the clamp and tighten the screw.
Rank No. #3
Raven R1510 PVC Termination Cap Mesh Screen Vent Cover, Furnace & Roof Vent Cap, Stainless Steel Wire Round Exhaust Pipe Cover End 4" Inner & 4.5" Outer Diameter
  • ATTENTION: Please Read: the inner diameter measures 4" inch and the outer diameter measures 4.5" inch, therefore any pipe connected with mesh pipe cover WILL NOT FIT so adapter such as PVC / rubber elbow or coupling must be purchased separately (not included) - please see listing images and infographic below for more details on compatible size to ensure correct pipe cap fitting
  • PRODUCT PATENT: PVC drain screen cover with wire round mesh screen built in slot allows water condensation to drain out on the side of the PVC vent screen cap attached to the exposed pipe outdoor through the ground, wall, or roof as shown in the listing images and infographic
  • SIMPLE & COMPATIBLE: mesh screen vent cover is easy to install and no effort is required by inserting the termination vent cap inside the hub or adapter of the PVC / rubber elbow or coupling (not included) compatible with pipes connected to high efficiency furnace, steam, water heater, air intake, exhaust, roof vents, sewer and water drains
  • TOUGH: the white stainless steel termination vent mesh screen cover is the best pipe cover for outdoor that won't corrode or rust preventing leaves, debris, birds, bugs, and wildlife from entering the mesh screen vent pipe cover
  • AIRFLOW: PVC pipe cover works as pipe screens with stainless steel mesh screen cap that allows maximum airflow for the furnace work through the mesh screen vent termination cap as an outdoor conduit
Rank No. #4
FixtureDisplaysยฎ Clear Acrylic Tube 4" (Nominal) Diameter (3.937" Exact Outside dim) x 24" Long, 5/64" (2mm) Wall Open Ended 15139-24"-1PK-NF
  • FixtureDisplays Clear Transparent Plexiglass Acrylic Tube 4" (101mm) diameter x 24" (609mm) long, 5/64" (2mm) Wall Thickness. Made from high quality acrylic. Great clarity.
  • Easy to work with, can be saw cut, drilled, painted, lasered, glued, and heat formed. Use in any DIY projects such as industrial, science, plumbing, design, models, aquariums, crafts, and much more.
  • Overall measures 24" long, 4" outside diameter, 5/64" (2mm) wall thickness. Weight is 1.03 lbs.
  • To purchase acrylic glue please follow this asin: B08T8ZC1FJ. For clear acrylic disc: B07L61X48Y. For clear acrylic sheets: B01IUT4I7I. Recommend FixtureDisplays acrylic glue solvent based plexiglass cement item number 11310. Asin is: B08T8ZC1FJ
  • Diameter and length measurements are nominal. If your needs are scientific and requires high precision, please contact us prior to making your purchase. Exact diameter is 99.9998 mm (3.937 inch). If your requirement is precise, contact us prior to your purchase.
Rank No. #5
4 Inch Diameter T Joint 3 Way - Duct Splitter for Exhaust Fan Dryer - 3 Way Duct Hose Connector (4'' inch, White)
  • This duct connector is a three-hole connector with two branches. With the dryer vent hose it can be connected to exhaust fans, dryer vent covers and vent seals.
  • Easy to install and durable, just push-fit duct and fittings together. Made of high quality ABS plastic, it is a material with high strength, good toughness and easy processing.
  • The interior of the duct splitter is smooth, and its reasonable curvature greatly reduces the wind resistance. At the same time, it can discharge air from each part in the ventilation project.
  • The dryer duct connector is seamlessly connected to achieve a good leakproof effect. Great for dryer hose. Don't worry about leaking air after installation. It is small in size, so it doesn't take up space.
  • Equal T piece male spigot will fit into round 100mm ventilation pipe or 102mm flexble ducting.
Rank No. #6
POWERTEC 70272V Clear PVC Pipe 4" x 36" Long, 1PK, Rigid Plastic Tubing for Dust Collection Hose & Fittings
  • INCLUDES/ SPECIFICATIONS: (1) Round, Clear PVC Dust Collection Pipe; 4โ€ O.D. , 5/64 inch wall thickness , 36โ€ long (Clear with Blue Tint )
  • APPLICATIONS: It can be used in conjunction with couplers to form an extension or foundation for dust collection systems and it is designed to work with ports and hoses with 4โ€ I.D.
  • FEATURES: This PVC pipe increasing productivity while utilizing see-thru visibility of air flow for dust extraction because the rigid pvc tubing proved more efficient than standard dust collection hoses over longer distances.
  • PREMIUM QUALITY: Made with strong, yet lightweight rigid PVC plastic constructed with optimal impact resistance and practical durability for everyday usage. NOT standard schedule 40 PVC pipe.
  • SPECIFICATIONS: 4โ€ O.D. | 5/64 inch wall thickness | 36โ€ long
Rank No. #7
4 inch Diameter by 10 foot Long PVC Dust / Debris Collection Hose MADE IN THE USA with 2 each 4 inch Turnkey Stainless Steel Hose Clamps
  • When setting up our dust collection or filtration systems we tend to have a lot of โ€œmoving partsโ€ during this process and trying to figure out what type of line, piping or hose to use can be challenging. Dust collection hoses need to be not only long enough, but it must be durable, flexible and sturdy enough, so it wonโ€™t completely collapse in use. It must also perform under the constant use and abuse of an everyday workshop environment. This PVC hose checks all of those boxes and more!
  • Typically, PVC hose works best as a dust collection hose for woodworking applications where dust and chips from cutting, milling or sanding wood is a problem. This heavy-duty hose will stand up to small and large chunks of wood without getting punctured as well as handle the smallest of saw dust without leaking. PVC hose can be used as a primary line or can be plugged into and out of machinery as needed.
  • PVC Hose (depending on diameter) can be used with dust collectors, shop vacuums, industrial vacuum systems, lawn tractor leaf catchers and a whole lot more! Simply make sure both ends of the hose are secured with hose clamps and your ready to go. The PVC hose flexes enough to weave in and out of shop machinery or table legs without kinking. Its also sturdy enough that it wonโ€™t flatten out when the dust collector is turned on. The hose has a compression ratio of 3: 1.
  • NO MORE TOOLS! โ€“ Set your tools aside when installing your ductwork or hose with these handy, easy to tighten hose/duct clamps. Place the clamp where its needed then simply turn the key to loosen or tighten them.
  • 304 STAINLESS STEEL HOSE CLAMP- The 4โ€ diameter large hose duct clamp (including the housing, the band and the internal screw are made from premium 304 stainless steel. This makes the clamp strong, durable and rust resistant which makes it ideal for many applications in the shop or around the home.
SaleRank No. #8
(Pack of 2) 4" OD Round Plastic Cap Plugs | (Multi Gauge - ID 3.56" to 3.74") Heavy Duty - Impact Resistant Tough Design || Fence Post Slide Inserts | Fitness Eqpt End Plugs | by SBD
  • @: CAUTION: The size 4" od s for the OUTSIDE DIMENSION OF THE TUBE. THIS PLUG DOES NOT FIT 4" HOLE INSIDE OPENING. "It Fits Inside hole ID opening from 3.56" to 3.74" ONLY, and Outside TOP CAP dimension of 4". . Check your tube ID to be within the range before ordering"
  • LDPE hard plastic impact resistant. Slightly domed construction. Flexible ribs. For ID up to 3.74 "diameter
  • Please check the OD and ID of the pipe you are installing. These are only good up to 3.74" ID. The size 4" reflects the out side diameter of the top cap. This plug top cap is slightly domed as pictured.
  • This Plug is slightly domed and rugged construction for long life and indent resistence.
  • PACK of 2 - 4" OD ROUND Plastic CAP PLUGS | For Hole diameter GRIP RANGE 3.56" to 3.74") Heavy Duty - Impact Resistant TOUGH Design || Fence Post Slide Inserts-Fitness Eqpt End Caps | by SBD
Rank No. #9
PMD Products Cylinder Washing Brush, Nylon, 4" Diameter, 16 inches Long
  • 4" Diameter Cylinder Cleaning brush, 15-3/4" long
  • Steel shaft with black nylon brush material the nylon brush material
  • Nylon is 5" long along the shaft but 4" inches in diameter
  • Thick twisted steel shaft with loop on end that can easily be cut off it not desired
  • Brush is perfect for cleaning cylinders after bore honing
Rank No. #10
SlipX Solutions Bottomless Bath | Overflow Drain Cover for Tub | Best Gifts for Mom, Spa & Bath Accessories | Drain Block, Water Stopper Plug | Bath Essentials for Women | 4" Diameter, Bronze
  • Bottomless Bath is a must have bath essential for your tub to enjoy a better bath experience. A few extra inches of water makes all the difference! Treat yourself to a luxury spa like bath with this overflow drain cover.
  • Bath accessories for the tub women love! Stop listening to water trickle down the drain and sink into bubbles, salts, magnesium flakes, and scented soaps in peace. The Bottomless Bath prevents water from entering the perimeter of the overflow drain, so you can soak in peace.
  • Designed with power grip, reliable suction cups that create an ultra-tight seal. Our proven high-quality material and design creates a powerful long-last seal. When you're filling the tub, simply run warm water over the suction cups and press each suction cup firmly against the tub.
  • Perfect Fit for Most Drains: Measuring 4-inch inner diameter and 2 in. deep, the Bottomless Bath fits commonly found bathtub overflow drains, like toggle/trip lever, flat, or snap drain types.
  • This bathroom overflow tub drain cover makes the perfect Birthday and Christmas gifts for a mom who has everything! The Bottomless Bath is also backed by the SlipX Solutions Peace of Mind Promise. Simply reach out to our friendly Customer Care Team via Amazon with any questions or concerns after using it.
SaleRank No. #11
TURBRO AirSupply Vent Hose 4 Inch Diameter 25 Feet Length - Flexible Aluminum Ducting w/ 2 Stainless Steel Clamps for HVAC Ventilation, Air Exhaust and Circulation in Grow Tent, Kitchen, and Bathroom
  • ๐Ÿ”„ใ€Ideal Ductingใ€‘This is a 4-inch diameter vent hose. You can adjust the length from 1.3 to 25 feet for any general purpose HVAC application.
  • ๐Ÿ”„ใ€4-Layer Structureใ€‘Our vent hose is constructed of dual-layer flame-resistant aluminum foil and dual-layer PVC thermoplastic. With protection, this duct hose is extremely durable and not easily torn compared to a single-layer design.
  • ๐Ÿ”„ใ€Efficient Spiral Wiringใ€‘The built-in spiral steel-wire makes the hose flexible and easy to adjust while keeping the tube smooth and straight when stretched out, maximizing airflow and reducing CFM losses.
  • ๐Ÿ”„ใ€Easy to Useใ€‘Installation is easy by attaching each end to the opening of the appliance. The included stainless steel clamps help secure the hose from leakage. You can bend or cut the tube freely to fit your unique space restrictions.
  • ๐Ÿ”„ใ€Multiple Applicationsใ€‘This ducting is primarily used with duct fan systems for air circulation in hydroponic grow tents, smell and moisture removal in bathrooms, and hot air exhaust in computer rooms. This ducting can also be used to remove smoke and odors during industrial laser cutting processes.
SaleRank No. #13
4 inch diameter x 10 foot long Ultra Flex Clear Vue Heavy Duty PVC Dust Debris and Fume Collection Hose MADE IN USA!
  • When setting up our dust collection or filtration systems we tend to have a lot of โ€œmoving partsโ€ during this process and trying to figure out what type of line, piping or hose to use can be challenging. Dust collection hoses need to be not only long enough, but it must be durable, flexible and sturdy enough, so it wonโ€™t completely collapse in use. It must also perform under the constant use and abuse of an everyday workshop environment. This PVC hose checks all of those boxes and more!
  • Typically, PVC hose works best as a dust collection hose for woodworking applications where dust and chips from cutting, milling or sanding wood is a problem. This heavy-duty hose will stand up to small and large chunks of wood without getting punctured as well as handle the smallest of saw dust without leaking. PVC hose can be used as a primary line or can be plugged into and out of machinery as needed.
  • PVC Hose (depending on diameter) can be used with dust collectors, shop vacuums, industrial vacuum systems, lawn tractor leaf catchers and a whole lot more! Simply make sure both ends of the hose are secured with hose clamps and your ready to go. The PVC hose flexes enough to weave in and out of shop machinery or table legs without kinking. Its also sturdy enough that it wonโ€™t flatten out when the dust collector is turned on. The hose has a compression ratio of 3: 1.
  • This PVC hose is clear which allows you to see whatโ€™s going on inside the hose while the dust and debris are flowing through it. Not only can you see the dust and debris, you can also see if any build up or blockage has occurred. Being able to see this makes fixing any suction issues with the hose much easier than typical opaque hoses.
  • While PVC Hose can be used on other machinery or devices it has been designed for dust collection purposes. The hose temperature range is -20ยฐ F to 165ยฐ F which is ideal for indoor use like in a woodworking or workshop environment. The clear hose wraps around a black carbon steel wire helix that reinforces the hose to keep it from kinking and is capable of an electrostatic discharge when properly grounded at both ends of the hose.
Rank No. #14
Tubeequeen Kraft Heavy Duty Mailing Tubes with End Caps - Art Shipping Tubes for Document Storage, 4 inch x 36 inch Useable Diameter and Length, Pack of 2
  • ๐Œ๐€๐ˆ๐‹๐ˆ๐๐† ๐“๐”๐๐„๐’ ๐–๐ˆ๐“๐‡ ๐‚๐€๐๐’: Mailing tubes are an economical way to protect blueprints, artwork, and posters. shipping tubes for art, drafts, rolled documents, or miscellaneous items.
  • ๐Œ๐€๐“๐„๐‘๐ˆ๐€๐‹: Mailing tubes are made of kraft wound fibreboard. Plastic end caps are friction-fit to stay on during mailing. White end caps included for both ends.
  • ๐’๐ˆ๐™๐„: The actual size is 4 inch diameter by 37 inch long and 36 inch usable length with caps. Mailing tubes 2 pack with caps.
  • ๐’๐„๐‚๐”๐‘๐„ ๐€๐๐ƒ ๐’๐“๐‘๐„๐๐†๐“๐‡: Includes white end caps that snap into place to keep contents secure. Caps will not pop off during transportation. 3-ply spiral wound construction at 0.06 thickness provides strength. Extra strength spiral construction for durability.
  • ๐ˆ๐ƒ๐„๐€๐‹ ๐”๐’๐„๐’: Ideal for shipping and storing artwork, posters, papers, or documents. These mailing tubes resist folding or bending and can be reused.
Rank No. #15
240 Buna-N O-Ring, 50A Durometer, Round, Black, 3-3/4" ID, 4" OD, 1/8" Width (Pack of 8)
  • Made of Buna-nitrile (also called Buna-N) for use with a variety of fluids from petroleum to aliphatic hydrocarbons
  • Durometer (hardness) of 50A for resistance to penetration
  • Round cross-section to provide a seal between cylindrical overlapping surfaces
  • For use across a wide temperature range from -30 degrees F/-34 degrees C to 250 degrees F/121 degrees C
  • Meets standards defined by Aerospace Standard AS568A
Rank No. #16
5 Pack Gloss White Goof Trim Ring for 4" Inch Recessed Can Lighting Down Light, Outer Diameter 6.7 Inches, Inner Diameter 4.2 Inches
  • Gloss White finish. Covers unsightly, torn drywall caused by the removal of existing trim
  • Outer Diameter: 6.7 inches. Inner Diameter: 4.25 inches. Thickness: 0.125 inches
  • Designed for 4 Inch Recessed Cans for Ceiling Light Fixtures
  • Trim rings cover gaps from mis-cut and over-sized holes
Rank No. #17
E-outstanding 12pcs E12 Candelabra Base White E12 Candle Socket Covers with Realistic Wax Beads 1 Inch Diameter 4 Inches Length
  • Made of high-quality PVC,excellent workmanship, sturdiness, safety, and long service life.
  • These candle holders are thicker materials and easy to install.
  • It does look like an actual candle with wax drops, which greatly enhances the light.
  • Suitable for replacement of old chandeliers, suitable for most chandeliers, please determine your lamp size.
  • Lamp Holder Model: E12; Material: PVC; Size: 25x100mm / 1x4Inch (DxL); Color: White; Package Includes: 12PCS Candle Light Sockets.
SaleRank No. #18
Hubbell-Raco 812C 20A Receptacle 1.594-Inch Diameter 4-Inch Square Exposed Work Cover
  • RACO exposed work covers include required hardware for mounting the receptacle(s)
  • RACO exposed work covers meet the requirements of the 2014 NEC Article 250.146(A). No bonding jumper is required for covers with: (1) Crushed corners
  • Hardware and cover are packed in a poly-bag with printed catalog number, compliances and installation instructions
  • cULus Listed
  • Square Exposed Work Cover
Rank No. #19
ECUDIS 4 Inches Diameter Universal Light Fixture Crossbar, 2 Sets Circle Mounting Bracket, Steel Crossbar Plate with Ground Screw for Mount Wall Light, Close to Ceiling Light, Chandelier
  • 2 Pack 4 Inches diameter universal mounting plate , made of high quality zinc plated steel, durable and safe to use indoors or outdoors.
  • ECUDIS light fixture mounting bracket adapter is designed to be applied on fixtures and canopies to electrical junction boxes.
  • Easy to install the crossbar on the electric box, please follow your local electrical codes and regulations.
  • 2 pack mounting bracket is enough for your use, great for mounting wall light, close to ceiling light, LED light, pendant light and chandelier, etc.
  • Package includes: 2 x Steel Crossbar Plate and mountng screws accessories.
Rank No. #20
4" 6061 Aluminum Round Rod 4"Long,T6511,Extruded, 4" Diameter Solid New Mill Stock Extruded Lathe Bar Stock (1, 4x4 inch)
  • ใ€Materialใ€‘Our aluminum rods are all made of 6061aluminum,6061aluminumWith medium strength, good corrosion resistance, weld ability, good oxidation effect.
  • ใ€Sizeใ€‘Our aluminum rod size is 4 Inch Diameter, 4 Inch Length.
  • ใ€Sturdy and practicalใ€‘Our products are cut by automatic cutting machine, the surface is smooth without burrs, with good corrosion resistance, oxidation resistance and not easy to rust, it is your best choice.
  • ใ€Extensive useใ€‘Various industrial structural parts with high weld ability and corrosion resistance, such as manufacturing furniture, mechanical parts, precision machining, and extensive industrial materials, etc.
  • ใ€After sales serviceใ€‘After you buy our products, if you have any questions, you can contact us at any time, we will help you solve the problem in the shortest possible time.

Last update on 2023-08-04 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

How Do You Buy The Best 4 Inch Diameter?

Do you get stressed out thinking about shopping for a great 4 Inch Diameter? Do doubts keep creeping into your mind? We understand, because we’ve already gone through the whole process of researching 4 Inch Diameter, which is why we have assembled a comprehensive list of the greatest 4 Inch Diameter available in the current market. We’ve also come up with a list of questions that you probably have yourself.

We’ve done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for 4 Inch Diameter that you consider buying. Your questions might include the following:

  • Is it worth buying an 4 Inch Diameter?
  • What benefits are there with buying an 4 Inch Diameter?
  • What factors deserve consideration when shopping for an effective 4 Inch Diameter?
  • Why is it crucial to invest in any 4 Inch Diameter, much less the best one?
  • Which 4 Inch Diameter are good in the current market?
  • Where can you find information like this about 4 Inch Diameter?

We’re convinced that you likely have far more questions than just these regarding 4 Inch Diameter, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for 4 Inch Diameter, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible 4 Inch Diameter. Make sure that you are only using trustworthy and credible websites and sources.

We provide an 4 Inch Diameter buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available 4 Inch Diameter currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of 4 Inch Diameter has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an 4 Inch Diameter?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your 4 Inch Diameter.
  5. Customer Ratings: Number ratings grade 4 Inch Diameter objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their 4 Inch Diameter.
  7. Product Quality: You don’t always get what you pay for with an 4 Inch Diameter, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an 4 Inch Diameter is should be an indication of how long it will work out for you.

We always remember that maintaining 4 Inch Diameter information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

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FAQ:

Q: What is the diameter of 4 PVC?

A: This 4″ nominal size PVC pipe has an actual outside diameter of 4.50 inches. This pipe is compatible with standard 4″ size PVC fittings and valves.

Q: What is the formula for finding the diameter?

A: Formula. The formula to find the diameter states the relationship between the diameter and the radius. The diameter is made up of two segments that are each a radius. Therefore, the formula is: Diameter = 2 * the measurement of the radius. You can abbreviate this formula as d=2r.

Q: What is the circumference of 4 in?

A: For example, the circumference of a circle with a radius of 4 inches is simply 2 x 3.14159 x 4 = 25.13 inches. If the diameter is given instead, first divide it by two, then repeat the above process. For example, if the diameter is 16 feet, then the radius is 16 / 2 = 8 feet. The circumference is therefore 2 x 3.14159 x 8 = 50.26 feet.

Q: What is the diameter of a #4 screw?

A: In the Unified Thread Standard (UTS) system, manufacturers list the diameter size as a number between 0 and 10, with 0 being the smallest and 10 being the largest. Screws larger than a #10 have a diameter listed directly in inches. For example, on a #4-40 UNC-3A x .5 screw, #4 represents the diameter. It has a diameter of 0.112 in (0.28 cm).

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