Coarse Thread type 17 hex head
wood screws
Hex Head . No Cam-Out, No Stripping
Type 17 Point . Saves Time, No Pre-Drilling.
Deep Coarse Threads. Built for Heavy Timber.
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Sinsun Hex Head Wood Screws | Type 17 Point & Coarse Thread for Heavy-Duty Wood Construction
Sinsun hex head wood screws deliver unmatched driving power with a 6-sided head, aggressive Type 17 point, and deep coarse threads. Engineered for lag bolt strength with screw convenience. Browse specs, compare & buy direct.
Get a Quick Qoute
The Lag Bolt Replacement: Sinsun Heavy-Duty Hexagon Head Wood Screws
Sinsun Hex Head Wood Screws are made for jobs where regular Phillips or square drive screws don't work. This screw is designed to replace traditional lag bolts in a wide range of heavy-duty wood-to-wood and wood-to-metal connections.
It has a hex (6-lobe) head that can handle a lot of torque, a Type 17 (auger) point that starts on its own, and a coarse thread that bites aggressively.
Great for building timber frames, deck posts, ledger boards, playground equipment, fence posts, heavy furniture, and securing brackets and straps to wood.
Hex Head Advantage
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The six-sided hex head is designed to be driven with a socket wrench or impact driver with a hex bit.
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With a 360-degree contact surface, Phillips and slotted drives do not slip as they "cam out" (cam out).
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The screw can be fully tightened to achieve maximum clamping force without damaging the drive recess due to its increased torque.
Type 17 (Auger) Point
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A sharp, aggressive flute is featured in this tip, which acts like a drill bit.
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Function:The tool efficiently creates a pilot hole in softwoods and standard lumber, eliminating the need for pre-drilling.
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Benefit:You will save time and labor on every screw by eliminating this step from your workflow. It also helps prevent wood splitting by clearing material ahead of the screw threads.
Coarse and Deep Threads
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Coarse threads have a wider spacing (fewer threads per inch, or TPI) compared to fine threads.
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Advantage in Wood: Their increased tensile strength and low pull-out resistance result in faster driving speeds in softwoods, plywood, and pressure-treated lumber, which are the most common materials for these screws.
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Result:Stronger, more secure connections that resist loosening from vibration or shrinkage.
Diameter (Gauge) |
Length (inches) |
Thread Type |
Surface Finish/Coating |
Drive Size |
Common Applications & Notes |
#8 |
3/4", 1", 1-1/4", 1-1/2" |
Coarse Wood |
Zinc Plated, Yellow Zinc, Black Oxide |
1/4" |
Attaching hardware, light framing, general repairs. The versatile all-rounder. |
#10 |
1", 1-1/2", 2", 2-1/2" |
Coarse Wood |
Zinc Plated, Yellow Zinc, Hot-Dip Galvanized, Stainless Steel (A2) |
5/16" |
Deck framing, fencing, furniture construction. Excellent strength-to-size ratio. |
#12 |
1-1/2", 2", 2-1/2", 3" |
Coarse Wood |
Yellow Zinc, Hot-Dip Galvanized, Stainless Steel (A2/A4) |
5/16" or 3/8" |
Heavy-duty fencing, timber connectors, outdoor structures. For high-load applications. |
1/4" |
2", 2-1/2", 3", 4", 6" |
Coarse Wood |
Hot-Dip Galvanized, Stainless Steel (A2/A4) |
7/16" |
Structural connections (ledger boards, beam fastening), large timber work. Replaces lag bolts. |
5/16" |
3", 4", 5", 6", 8" |
Coarse Wood |
Hot-Dip Galvanized, Stainless Steel (A4-316) |
1/2" |
Heavy timber framing, marine/dock construction, critical structural joints. Maximum strength. |
Selection Guide & Key Features
Expert specifications for Sinsun hex head timber screws
DRIVE SIZE
Drive Size: You need a matching socket wrench or impact driver bit to use the Hex Drive. It has a strong grip that is very hard to cam out, so it can be used for high-torque driving and in situations where the fastener head might get dirty or painted over.
THREAD & POINT
Thread and Point: All screws have a rough, aggressive thread that makes them easy to drive and strong enough to pull out of wood. Most have a sharp point that self-starts. Some longer or heavier-duty versions may have an auger point for removing chips from thick wood.
Guide to Surface Finish:
Zinc/Yellow Zinc: This is the standard for outdoor use in general. Yellow zinc is better at resisting corrosion.
Hot-Dip Galvanized: Good for direct contact with pressure-treated wood (ACQ) and tough outdoor conditions.
Stainless Steel (A2/A4): Necessary for the best protection against corrosion in coastal, marine, or chemical settings. The marine-grade is A4 (316).
Note: For a strong connection, ensure that the screw length allows it to penetrate the main holding member at least 1-1/2 inches. It is best to pre-drill a pilot hole in hardwoods or near the edges of boards to keep them from splitting.
| Feature | Specification | Benefit |
| Drive Type | External Hex Head | Allows for high-torque application with standard sockets; virtually impossible to strip. |
| Common Drive Sizes | 1/4", 5/16", 3/8" | Compatible with common impact driver sockets for efficient work. |
| Head Styles | Standard Washer Head, Flat Washer Head | Provides a larger bearing surface to prevent pull-through in softwoods. |
| Point Type | Sharp Self-Tapping Point, Optional Drill Point | Fast starts and reduced wood splitting; drill point version for hardwoods or metal connectors. |
| Common Lengths | 1" to 8" (25mm to 200mm) | Caters to projects from trim work to major structural lumber. |
| Surface Finishes | Zinc Plated: Basic corrosion resistance. Hot-Dip Galvanized: Superior rust protection for outdoor use. Ceramic-Coated (e.g., Dacromet): Premium, long-life finish for severe environments. | A finish for every application and budget. |
Drive Type |
Torque Capacity |
Risk of Cam-Out/Stripping |
Best For |
Not Ideal For |
Hex Head (External) |
Very High |
Very Low |
Structural framing, decking, high-strength connections,use with impact drivers. |
Applications where a flush finish is needed without a cap. |
Star (Torx) |
High |
Low |
General woodworking, furniture, where high torque is needed. |
The highest-torque structural applications (can be outperformed by hex). |
Phillips |
Low |
High |
General DIY, light-duty assembly. |
Any high-torque, professional, or structural application. |
Square (Robertson) |
Medium |
Medium |
General construction (popular in Canada). |
Situations requiring the absolute maximum torque transfer. |
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For Decking
Use #10 x 3" Hot-Dip Galvanized screws with a washer head for securing deck boards to joists. The finish resists corrosion from pressure-treated lumber.
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For Timber Framing
Use #14 x 6" Ceramic-Coated screws with a drill point for connecting beams and posts. The hex drive handles the extreme torque needed.
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For Outdoor Furniture
Use #8 x 2" Zinc-Plated screws for assembling benches and tables. The clean drive provides a sturdy, long-lasting build.
Customer Story / Use Case
Municipal parks department used Sinsun's galvanized Hex Head Screws to build playgrounds, achieving 40% faster assembly while eliminating hazardous protruding bolt ends for safer play structures.
"Timber & Iron Works" relies on Sinsun Hex Head Screws to attach steel hardware to solid wood, virtually ending stripped fasteners and guaranteeing the robust construction of their high-end furniture.
Hex Head Wood Screws FAQ
Q1
What tool do I need for a hex head wood screw?
A hex key (Allen key) or a socket wrench. For power driving, use a drill with a matching hex bit adapter.
Q2
How do I choose the right screw length?
It should be 2.5 to 3 times the thickness of the top material you are fastening. For example, to join a 1" board, use a 2.5" to 3" screw.
Q3
What are the main advantages over Phillips head screws?
Far less likely to strip or cam out, allows for much higher torque, and is generally stronger and more durable.
Q4
Do I need to pre-drill a pilot hole?
Highly recommended for hardwoods or near edges to prevent splitting. For softwoods, it may not always be necessary but is still good practice.
Q5
Which surface finish is best for outdoor projects?
Hot-dip galvanized or stainless steel screws offer the best corrosion resistance for outdoor use.
Q6
Where should I use black hex head wood screws?
Primarily for indoor projects or protected outdoor areas. Ideal for furniture, shelving, or any application where visible screw heads need to blend in or match a dark/industrial aesthetic.
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