20 Best 6 Wood Screw Head Diameter [2024]

Are you looking for the best 6 Wood Screw Head Diameter? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling 6 Wood Screw Head Diameter.

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1 Mini Skater 200PCS Small Cross Flat Head Tapping Wood Screws with Oxide and Wax 4 Size Screws... Mini Skater 200PCS Small Cross Flat Head Tapping Wood Screws with Oxide and Wax 4 Size Screws...
2 #6 x 1/2' Stainless Truss Head Phillips Wood Screw (100pc) 18-8 (304) Stainless Steel Screws by Bolt... #6 x 1/2" Stainless Truss Head Phillips Wood Screw (100pc) 18-8 (304) Stainless Steel Screws by...
3 500pcs M3/3MM Diameter Phillips Pan Head Screws Self Tapping Drilling Screws Assortment Kit Carbon... 500pcs M3/3MM Diameter Phillips Pan Head Screws Self Tapping Drilling Screws Assortment Kit...
4 #6 X 3/4' Stainless Truss Head Phillips Wood Screw, (25pc), Black Xylan Coated 18-8 (304) Stainless... #6 X 3/4" Stainless Truss Head Phillips Wood Screw, (25pc), Black Xylan Coated 18-8 (304)...
5 #6 X 1' Stainless Truss Head Phillips Wood Screw, (25pc), Black Xylan Coated 18-8 (304) Stainless... #6 X 1" Stainless Truss Head Phillips Wood Screw, (25pc), Black Xylan Coated 18-8 (304) Stainless...
6 #6 x 5/8' Wood Screws 304 Stainless Steel Phillips Flat Head Screws Self Tapping Screws 100 Qty. #6 x 5/8" Wood Screws 304 Stainless Steel Phillips Flat Head Screws Self Tapping Screws 100 Qty.
7 Watch Band Strap Link Pins Remover Repair Tool,24 in 1 Kit with 6 Extra Tips Replacement,20PCS... Watch Band Strap Link Pins Remover Repair Tool,24 in 1 Kit with 6 Extra Tips Replacement,20PCS...
8 WoodPro Fasteners ST516X6-25PC 5/16-Inch by 6-Inch Length Round Washer Head Exterior Wood Screws,... WoodPro Fasteners ST516X6-25PC 5/16-Inch by 6-Inch Length Round Washer Head Exterior Wood Screws,...
9 Progress Lighting P4008-31 Five Light Chandeliers, 21-Inch Diameter x 16-Inch Height, Black Progress Lighting P4008-31 Five Light Chandeliers, 21-Inch Diameter x 16-Inch Height, Black
10 SNUG Fasteners 100 Qty #6 x 1-1/4' Oval Zinc Coated Phillips Head Wood Screws (SNG367) SNUG Fasteners 100 Qty #6 x 1-1/4" Oval Zinc Coated Phillips Head Wood Screws (SNG367)
11 #10 X 3/4' Stainless Pan Head Phillips Wood Screw, (100pc), 18-8 (304) Stainless Steel Screws by... #10 X 3/4" Stainless Pan Head Phillips Wood Screw, (100pc), 18-8 (304) Stainless Steel Screws by...
12 1000Pcs Mini Screw kit M1 M1.2 M1.4 M1.7 Phillips pan Head Micro Screws Self-Tapping Electronic... 1000Pcs Mini Screw kit M1 M1.2 M1.4 M1.7 Phillips pan Head Micro Screws Self-Tapping Electronic...
13 TPOHH 100 PCS #6 X 3/8 inch Stainless Steel 18-8 (A2) Wood Screws, Black Flat Head Phillips Full... TPOHH 100 PCS #6 X 3/8 inch Stainless Steel 18-8 (A2) Wood Screws, Black Flat Head Phillips Full...
14 Rok Hardware 100 Pack #6 x 1/2' Coarse Thread Phillips Flat Head Wood Screws Zinc MDF Rok Hardware 100 Pack #6 x 1/2" Coarse Thread Phillips Flat Head Wood Screws Zinc MDF
15 JQK #6 x 1/2' Black Screw, Flat Head Phillips Wood Screw 18-8 S/S Electroplating Black Stainless... JQK #6 x 1/2" Black Screw, Flat Head Phillips Wood Screw 18-8 S/S Electroplating Black Stainless...
16 Learning Resources Spike The Fine Motor Hedgehog - 14 Pieces, Ages 18+ months Toddler Learning Toys,... Learning Resources Spike The Fine Motor Hedgehog - 14 Pieces, Ages 18+ months Toddler Learning...
17 MEIYYJ 10 Kinds Small Multi-Purpose M1 M1.2 M1.4 M1.7 Phillips Head Micro Screws Self-Tapping... MEIYYJ 10 Kinds Small Multi-Purpose M1 M1.2 M1.4 M1.7 Phillips Head Micro Screws Self-Tapping...
18 #4 x 1/4' Stainless Flat Head Phillips Wood Screw, (100 pc), 18-8 (304) Stainless Steel Screws by... #4 x 1/4" Stainless Flat Head Phillips Wood Screw, (100 pc), 18-8 (304) Stainless Steel Screws by...
19 Prime-Line 9034691 Wood Screw, Flat Head Phillips, #6 X 1 in, Solid Brass, Pack of 25 Prime-Line 9034691 Wood Screw, Flat Head Phillips, #6 X 1 in, Solid Brass, Pack of 25
20 #6 x 5/8' Wood Screw 100Pcs 18-8 (304) Stainless Steel Pan Head Fast Self Tapping Drywall Screws by... #6 x 5/8" Wood Screw 100Pcs 18-8 (304) Stainless Steel Pan Head Fast Self Tapping Drywall Screws...
Bestseller No. 1
Mini Skater 200PCS Small Cross Flat Head Tapping Wood Screws with Oxide and Wax 4 Size Screws...
  • Screw color: Black and Bronze
  • Black color screws size (Diameter * Length): 3*6mm,3*8mm,3*10mm,3*12mm,each size has 25Pcs screws
  • Bronze color screws size (Diameter * Length): 3*6mm,3*8mm,3*10mm,3*12mm,each size has 25Pcs screws
  • Widely used in Woodworking, Gardening, Construction, Artwork making or any other DIY Projects.
  • This screw set is organized in a transparent storage case - easy to look up and store away for future use
SaleBestseller No. 2
#6 x 1/2" Stainless Truss Head Phillips Wood Screw (100pc) 18-8 (304) Stainless Steel Screws by Bolt...
  • 【100% Solid Stainless Steel】These Truss Head Screws are made of 18-8 (304) Stainless Steel which is one of the highest forms of corrosion...
  • 【Screws That You Can Depend On】Our Truss Head Wood Screws are very strong and are great for both indoor and outdoor use. This stainless is...
  • 【Great To Keep Around】Bolt Dropper stainless hardware is great to have around for use in wood and wet environments. Bolt Dropper hardware is the...
  • 【Dimensions】Diameter: #6 | Length: 1/2" | Thread Coarse (standard) | Quantity: 100 pcs | Material: 18-8 (304) Stainless Steel
  • 【LIFETIME GUARANTEE】We are so confident that our product is the best on the market that we offer a No Hassle Lifetime Guarantee.
Bestseller No. 3
500pcs M3/3MM Diameter Phillips Pan Head Screws Self Tapping Drilling Screws Assortment Kit Carbon...
  • Self-Tapping Screws- Black Zine-Plated Carbon Steel Pan Head Self Tappig Screws. Type: Self Tapping Screw. Head Style: Flat Head; Material: carbon...
  • Wide Application- Applicable to home and office appliance, communication equipments, furniture combination, plumbing repair, woodwork DIY, parts...
  • Useful Tools- Useful assortment and come with a nice case.Suitable for sheet metal, plastics, wood, drywall and other materials.
  • Package List- 500pcs Package List:M3*6 100pcs, M3*8 100pcs, M3*10 100pcs, M3*12 100pcs, M3*16 40pcs, M3*18 30pcs, M3*20 30pcs. Example:M3*10-...
  • WARNING- Products contain small parts, please do not let children play, to prevent inadvertent swallowed.
Bestseller No. 4
#6 X 3/4" Stainless Truss Head Phillips Wood Screw, (25pc), Black Xylan Coated 18-8 (304) Stainless...
  • 100% SOLID STAINLESS STEEL: These Truss Head Screws are made of Black Xylan coated 18-8 (304) Stainless Steel which is one of the highest forms of...
  • SCREWS THAT YOU CAN DEPEND ON: Our Truss Head Wood Screws are very strong and are great for both indoor and outdoor use. This stainless is superior to...
  • GREAT TO KEEP AROUND: Bolt Dropper stainless hardware is great to have around for use in wood and wet environments. Bolt Dropper hardware is the...
  • DIMENSIONS: Diameter: #6 | Length: 3/4" | Thread Type: Coarse (standard) | Quantity: 25 pcs | Material: Black Xylan coated 18-8 (304) Stainless Steel
  • LIFETIME GUARANTEE: We are so confident that our product is the best on the market that we offer a NO HASSLE LIFETIME GUARANTEE.
Bestseller No. 5
#6 X 1" Stainless Truss Head Phillips Wood Screw, (25pc), Black Xylan Coated 18-8 (304) Stainless...
  • 【100% Solid Stainless Steel】These Truss Head Screws are made of Black Xylan coated 18-8 (304) Stainless Steel which is one of the highest forms of...
  • 【Screws That You Can Depend On】Our Truss Head Wood Screws are very strong and are great for both indoor and outdoor use. This stainless is...
  • 【Great To Keep Around】Bolt Dropper stainless hardware is great to have around for use in wood and wet environments. Bolt Dropper hardware is the...
  • 【Dimensions】Diameter: #6 | Length: 1" | Thread Type: Coarse (standard) | Quantity: 25 pcs | Material: Black Xylan coated 18-8 (304) Stainless...
  • 【Lifetime Guarantee】We are so confident that our product is the best on the market that we offer a No Hassle Lifetime Guarantee.
Bestseller No. 6
#6 x 5/8" Wood Screws 304 Stainless Steel Phillips Flat Head Screws Self Tapping Screws 100 Qty.
  • ✅Quantity: 100, #6 x 1/2". Thread Diameter 0.138", Thread Length: 3/8", Head Diameter: 0.262", Head Height: 0.083". Use: Wood.
  • ✅Made of 18-8 grade stainless steel, provides strength and offers good corrosion resistance in many environments, Their high levels of chromium and...
  • ✅Flat heads are countersunk with a cone shaped bearing surface and a flat top that is used in applications where the head of the fastener must sit...
  • ✅Wood screws have deep coarse threads and are specifically designed for use in wood projects. The shank of the wood screw allows the screw to spin...
  • ✅Phillips drive is a cross head design and is the most commonly used type in America. Phillips is often criticized for its tendency to cam out at...
Bestseller No. 7
Watch Band Strap Link Pins Remover Repair Tool,24 in 1 Kit with 6 Extra Tips Replacement,20PCS...
  • What is in the package?EFIXTK watch band tool kit comes with a watch band link pin remover with 6 extra tips, a plastic watch holder, a dual head...
  • Easy to use: Size your watch band yourself with this small, simple tool effectively without wiggling
  • Fit for different sizes,Fit bands up to 30mm wide ,6 replacement pins and an adjustable base allow for use with different band thicknesses
  • VALUE KIT FOR MONEY SAVING - This watch band link remover is great for removing and inserting spring bars straps, and widely used in up to 30mm wide...
  • Package contents: 1PCS All-Metal Watch Band Link Remover,1PCS Holder,1PCS Head Hammer,1PCS Glasses Cloth,20pcs Cotter pins
SaleBestseller No. 8
WoodPro Fasteners ST516X6-25PC 5/16-Inch by 6-Inch Length Round Washer Head Exterior Wood Screws,...
  • 5/16 x 6-Inch length, Includes One 25mm T-30 Star Bit
  • T-30 Star Drive, Torx(tm) Compatible
  • Patented ASTER thread for quick starting
  • Sharp Type-17 Point for easy drilling
  • PPG Industries 1,500 Hour Golden E-Coat
Bestseller No. 9
Progress Lighting P4008-31 Five Light Chandeliers, 21-Inch Diameter x 16-Inch Height, Black
  • SIMPLE CLASSIC DESIGN: Incorporate a simple, classic lighting design into your home décor with the Five Light Collection’s Five-Light Chandelier is...
  • WHITE-SLEEVED LIGHT BASES: White-sleeved candle covers decorate light bases as they surround the vintage frame.
  • TEXTURED BLACK FINISH: Swooping curved arms coated in a farmhouse-inspired textured black finish add volume to the light fixture.
  • SIZE: Measures 21-inch width by 16-inch height.
  • WARRANTY: Our 1-year Limited Warranty guarantees your complete satisfaction with your purchase and includes professional after-sales customer service...
Bestseller No. 10
SNUG Fasteners 100 Qty #6 x 1-1/4" Oval Zinc Coated Phillips Head Wood Screws (SNG367)
  • Quantity: 100 #6 x 1-1/4" Screws
  • Drive Type: Phillips Head
  • Material: Zinc Plated Carbon Steel
  • Use: Wood
  • Thread Type: Fine Deep Thread
SaleBestseller No. 11
#10 X 3/4" Stainless Pan Head Phillips Wood Screw, (100pc), 18-8 (304) Stainless Steel Screws by...
  • 【100% Solid Stainless Steel】These Pan Head Screws are made of 18-8 (304) Stainless Steel which is one of the highest forms of corrosion resistant...
  • 【Screws That You Can Depend On】Our Pan Head Wood Screws are very strong and are great for both indoor and outdoor use. This stainless is superior...
  • 【GREAT TO KEEP AROUND】Bolt Dropper stainless hardware is great to have around for use in wood and wet environments. Bolt Dropper hardware is the...
  • 【Dimensions】Diameter: #10 | Length: 3/4" | Thread Type: Coarse (standard) | Quantity: 100 pcs | Material: 18-8 (304) Stainless Steel.
  • 【Lifetime Guarantee】We are so confident that our product is the best on the market that we offer a No Hassle Lifetime Guarantee.
SaleBestseller No. 12
1000Pcs Mini Screw kit M1 M1.2 M1.4 M1.7 Phillips pan Head Micro Screws Self-Tapping Electronic...
  • The screws is very small screws:A large assortment 10 of the most-used sizes is provided to suit your needs, Ideal for home, office, work, garage,...
  • These mini screw kit / self-tapping screws, are highly versatile and are used to attached metal, wood, fiberglass, and plastic
  • Self-tapping Screw is made of Stainless Steel, the threads create their own mating thread in pre-drilled holes
  • Self-tapping metal screws are fully threaded with a sharp point.
  • This Screws Nuts Set is well packed and assorted in a plastic box, worry free about damage or disorder. The box design is nice and easy to take right...
Bestseller No. 13
TPOHH 100 PCS #6 X 3/8 inch Stainless Steel 18-8 (A2) Wood Screws, Black Flat Head Phillips Full...
  • Size: #6, Thread Diameter(T): 0.16 inch / Metric Thread Diameter: M3.5
  • These Flat Head Screws are made of 18-8 (A2) Stainless Steel and have a Black Oxide Coating which is one of the highest forms of corrosion resistant...
  • TPOHH stainless hardware is great to have around for use in wood and wet environments. TPOHH hardware is the highest quality available on the market....
  • Hard to Strip: deep cut Philips Drive, no stripping heads any more.(pre-drilling recommended)
  • LIFETIME GUARANTEE: We are so confident that our product is the best on the market that we offer a NO HASSLE LIFETIME GUARANTEE.
Bestseller No. 14
Rok Hardware 100 Pack #6 x 1/2" Coarse Thread Phillips Flat Head Wood Screws Zinc MDF
  • Diameter: #6, Length: 1/2 in
  • Drive: Flat Head Phillips
  • Zinc finish for better corrosion resistance
  • A screw with excellent holding power in particle board, MDF, and plastic composites.
Bestseller No. 15
JQK #6 x 1/2" Black Screw, Flat Head Phillips Wood Screw 18-8 S/S Electroplating Black Stainless...
  • 【High Quality Black Screw】 18-8 premium-grade stainless steel for protect against corrosion & rust.
  • 【#6 x 1/2-Inch】 Diameter: #6 | Length: 1/2" | Thread Type: Coarse (standard) | Head: Flat Head |Quantity: 100 pcs | Material: 18-8 Stainless...
  • 【Great for softer materials】work for pine, plywood, particle board, MDF and melamine
  • 【Hard to Strip】deep cut Philips Drive, no stripping heads any more.(pre-drilling recommended)
  • 【Black Finish】 Total of 100 screws
SaleBestseller No. 16
Learning Resources Spike The Fine Motor Hedgehog - 14 Pieces, Ages 18+ months Toddler Learning Toys,...
  • FINE MOTOR GAMES FOR KIDS: Build fine motor skills with chunky, peg-shaped pieces that fit to the back of this friendly hedgehog. Also use Spike as...
  • DEVELOP: Colorful quills help kids build color recognition, sorting, and counting skills through fine motor skill games. Spike is also a great toy for...
  • TODDLER TOYS: Now fine motor intrinsic toys come with easy to grasp pieces that are just the right size for little toddler and preschool hands to...
  • EASY STORAGE: When playtime over the quills easily fit in the Hedgehog
  • GIVE THE GIFT OF LEARNING: Whether you’re shopping for holidays, birthdays, or just because, toys from Learning Resources help you discover new...
SaleBestseller No. 17
MEIYYJ 10 Kinds Small Multi-Purpose M1 M1.2 M1.4 M1.7 Phillips Head Micro Screws Self-Tapping...
  • High Quality:This small screws assortment kit is a small size self-tapping screw. Different Sizes,Flat Thin Head Small Phillips Screws
  • Material Types:Carbon steel.10 Kinds M1 M1.2 M1.4 M1.7 PA Phillips Self-Tapping Electronic Screws
  • Model Quantity:M1mm*3mm 100PCS;M1mm*4mm 100PCS ;M1mm*5mm 100PCS;M1.2mm*3mm 100PCS;M1.2mm*4mm 100PCS;M1.2mm*5mm 100PCS;M1.4mm*3mm 100PCS;M1.4mm*5mm...
  • The Small phillips Screws Assortment Kit Can be used for watches,clocks,Mobile phone,Computers etc
  • Packed in plastic box.The box design is nice and easy to take right screw out.
Bestseller No. 18
#4 x 1/4" Stainless Flat Head Phillips Wood Screw, (100 pc), 18-8 (304) Stainless Steel Screws by...
  • 【High Quality Stainless】These Flat Head Screws are made of 18-8 (304) Stainless Steel and have is one of the highest forms of corrosion resistant...
  • 【Screws That You Can Depend On】Our Flat Head Wood Screws are very strong and are great for both indoor and outdoor use. This stainless is superior...
  • 【Great To Keep Around】Bolt Dropper stainless hardware is great to have around for use in wood and wet environments. Bolt Dropper hardware is the...
  • 【Dimensions】Diameter: #4 | Length: 1/4" | Thread Type: Coarse (standard) | Quantity: 100 pcs | Material: 18-8 (304) Stainless Steel
  • 【LIFETIME GUARANTEE】We are so confident that our product is the best on the market that we offer a No Hassle Lifetime Guarantee.
Bestseller No. 19
Prime-Line 9034691 Wood Screw, Flat Head Phillips, #6 X 1 in, Solid Brass, Pack of 25
  • Head Type: Flat head phillips
  • Diameter & Length: #6 X 1 inch
  • Designed to attach wood to wood or hang items onto a wood structured fixture
  • Features a sharp pointed tip
  • Depending on the application and type of wood, a pre-drilled pilot hole is sometimes needed
Bestseller No. 20
#6 x 5/8" Wood Screw 100Pcs 18-8 (304) Stainless Steel Pan Head Fast Self Tapping Drywall Screws by...
  • RUGGED AND DURABLE - SG TZH Wood screws made of high-quality 18-8(304)Stainless Steel,which has higher corrosion resistance and anti-rust effect...
  • EXQUISITE CRAFTSMANSHIP - This fast self-tapping screw diameter: #6, length: 5/8inch, excellent craftsmanship makes our cross groove not slippery,...
  • WIDE RANGE OF APPLICATIONS - Precision threads can easily pass through a variety of materials, such as plastics, wood, metal, etc., suitable for door...
  • VALUE PACKAGING AND EASY TO USE - This Pan Head screws package contains 100PCS with horn cross head to meet your daily needs, is not easy to slide...
  • INTIMATE SERVICE - SG TZH focus on customer satisfaction, if you have any questions or are not satisfied, you can contact us by email, we will solve...

Having trouble finding a great 6 Wood Screw Head Diameter?

This problem is well understood by us because we have gone through the entire 6 Wood Screw Head Diameter research process ourselves, which is why we have put together a comprehensive list of the best 6 Wood Screw Head Diameters available in the market today.

After hours of searching and using all the models on the market, we have found the best 6 Wood Screw Head Diameter for 2023. See our ranking below!

How Do You Buy The Best 6 Wood Screw Head Diameter?

Do you get stressed out thinking about shopping for a great 6 Wood Screw Head Diameter? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching 6 Wood Screw Head Diameter, which is why we have assembled a comprehensive list of the greatest 6 Wood Screw Head Diameter available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for 6 Wood Screw Head Diameter that you consider buying. Your questions might include the following:

  • Is it worth buying an 6 Wood Screw Head Diameter?
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  • What factors deserve consideration when shopping for an effective 6 Wood Screw Head Diameter?
  • Why is it crucial to invest in any 6 Wood Screw Head Diameter, much less the best one?
  • Which 6 Wood Screw Head Diameter are good in the current market?
  • Where can you find information like this about 6 Wood Screw Head Diameter?

We’re convinced that you likely have far more questions than just these regarding 6 Wood Screw Head 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 6 Wood Screw Head 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 6 Wood Screw Head Diameter. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an 6 Wood Screw Head 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 6 Wood Screw Head 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 6 Wood Screw Head 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 6 Wood Screw Head 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 6 Wood Screw Head Diameter.
  5. Customer Ratings: Number ratings grade 6 Wood Screw Head Diameter objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their 6 Wood Screw Head Diameter.
  7. Product Quality: You don’t always get what you pay for with an 6 Wood Screw Head Diameter, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an 6 Wood Screw Head Diameter is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining 6 Wood Screw Head 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: How to choose the correct size wood screws?

A: How to Choose the Correct Size Wood Screws Common Sizes. All sizes, except for gauges, are in inches. … Length, Gauge, and Pilot Holes. Understanding a few basic principles behind the technology of wood screws will take you a long way toward knowing which type of screw to choose. Lateral vs. Withdrawal Loads. … Utility Screws vs. Steel Screws. … Wood Grain Orientation. …

Q: What are the sizes of wood screws?

A: Wood screws are numbered from 0 to 20, indicating a diameter from about 1/16 in. to 5/16 in. The length of wood screws is measured in inches and fractions of inches and ranges from approximately 3/4 inches long to 4 inches. Drywall screws are available in sizes 6 to 10, with the size indicating threads/per inch.

Q: What are the dimensions of a wood screw?

A: A typical lag screw can range in diameter from 1⁄4 in (6.35 mm) to 11⁄4 in (31.75 mm), and lengths from 1⁄4 to 6 in (6.35 to 152.40 mm) or longer, with the coarse threads of a wood-screw or sheet-metal-screw threadform (but larger).

Q: What diameter is a number 6 screw?

A: This means it’s a #6 diameter, with 32 threads per inch (almost double the normal thread count as a standard wood screw) and an inch and a half long. When the middle number is absent (6 x 1 1/2″), the screw has the “normal” number of threads per inch for that size and type of screw (for #6 wood screws that’s 18).