What is Rail Lag Bolt?
A Rail Lag Bolt, also called sleeper screw, rail screw or lag bolt, is a medium or large metal screw used to fasten a rail base plate or rail. Such spikes are always fastened into holes bored into the tie sleeper, sometimes together with imbedded plastic dowels, popularly used for rails with wooden sleepers, especially in America and Canada. Rail Lag Bolts are usually made of high-strength steel with special shapes and sizes to meet the requirements of the rails and sleepers. The shape of Rail Lag Bolts is usually a long and slender screw with a flat head and a sharp bottom. This design allows the screws to penetrate the holes in the rails and provide a stable connection on the sleepers.
Advantages of Rail Lag Bolt
Rail lag bolts, also known as lag bolts, are used to attach two objects together with a strong secure connection. This heavy-duty screw has a hexagonal head and a tapered pointed end. The rail lag bolt is designed to be driven into wood or other materials by using a wrench or socket wrench. Rail lag bolts offer several benefits that make them a great fastener choice for securing heavy objects to wood or wood-based materials:
● Rail lag bolts are designed for heavy-duty applications and provide a strong, safe, and secure connection. Their durability also makes them suitable for outdoor use and hot environments.
● The threading that is on the rail lag bolts helps prevent them from loosening over time due to vibrations or external forces, increasing their longevity.
● The pointed tip of the screw acts as a self-drilling pilot point, which reduces the risk of wood splitting.
● Rail lag bolts are easy to install using a wrench or socket driver. They do not require any additional hardware, such as washers or nuts, saving you time and money.
● These screws can be used in a wide range of projects and there are options for corrosion-resistant materials, such as steel, stainless steel, and galvanized steel.
● Rail lag bolts come in a wide range of lengths and diameters to fit your project.
Rail lag bolts, also called lag bolts, are large wood screws with hexagonal heads. They're used in a variety of applications where it is important to have a screw with lots of holding power. They are typically used to secure lumber and other heavy materials that bear a lot of weight or stress. Their threads create a strong grip on the material, while the head pulls everything together tightly.
Common sizes are 5/16-inch to 3/8-inch, which are massive when compared to other wood fasteners. These extremely sturdy fasteners are usually used to connect heavy lumber or other heavy materials that are bearing an intense load.
Rail lag bolts differ from other types of screws, like drywall screws and deck screws, because they are designed to drive into wood with a wrench or socket. Their heads are usually larger than other screw heads and have a hexagonal shape, so a wrench can turn it. The threads on rail lag bolts are also coarser, which helps them grip the material better than traditional screw threads.
Features of Rail Lag Bolt
Fixing rails
Rail lag bolts secure the rails tightly to the sleepers by driving them into the wooden or concrete sleepers, preventing any movement or shaking. This ensures the stability and safety of the railway lines.
01
Load transfer
Rail lag bolts are designed to withstand the heavy pressure and vibration generated by trains in motion. They firmly connect the rails to the sleepers, effectively transferring the load of the trains to the foundation and underlying support structures.
02
Maintaining rail geometry
Rail lag bolts play a crucial role in maintaining the desired rail geometry. They keep the rails in the correct position and spacing, ensuring the rails' levelness, vertical alignment, and curvature meet the design requirements.
03
Preventing rail slippage
By firmly fixing the rails, rail lag bolts prevent any slippage during train operations. This is essential for ensuring stable passage of trains through the railway rails.
04
Improving operational safety
Good rail fixation enhances the safety of railway lines. Rail lag bolts play a vital role in preventing rail movement, reducing vibration, and maintaining rail geometry, thereby improving the smoothness and safety of train operation.
05
What Is the Difference Between a Rail Lag Bolt and Metal Screw?
The main difference between a rail lag bolt and a metal screw is their intended use. A screw drives into wood, while a rail lag bolt is designed for use in masonry or other hard surfaces. The threads on a rail lag bolt are also more course than those of a metal screw.
Rail lag bolts most commonly fasten wood and composite materials together. They can also secure metal, stone and concrete. The material you choose will depend on the strength and durability you need.
As far as versatility goes, rail lag bolts are high-quality fasteners for a variety of applications. When used correctly, they provide a strong and secure connection.
The shape of rail lag bolts is usually a long and slender screw with a flat head and a sharp bottom. This design allows the screws to penetrate the holes in the rails and provide a stable connection on the sleepers.
To install rail lag bolts, holes are first pre-drilled into the sleepers, and then the screws are inserted into the holes. Using a screw hammer or other suitable tools, the screws are hammered into the sleepers, ensuring that they are firmly anchored to the rails. Due to their longer length compared to regular screws, rail lag bolts provide additional support and stability.
Rail lag bolts play a crucial role in railway construction and maintenance, helping to fix the rails and maintain their correct position. This type of screws must undergo strict quality control and testing to ensure that they can withstand the weight of the trains and the vibration force during operation.
In summary, rail lag bolts are special screws used to secure railroad rails to the sleepers. They provide stable connection and support, allowing railway systems to operate safely and securely.
How to Choose Rail Lag Bolt?
Screw vs. Bolt
Rail lag bolts are often called lag bolts. This term is technically incorrect because bolts are used with a nut to secure them in place. A screw is driven into the material it is holding together which is typically wood and does not have a nut securing it in place.
Size and grade
The two critical dimensions when ordering rail lag bolts are the diameter of the lag and the length measured from the underside of the head. Most rail lag bolts are ordered under the astm a307 grade a specification which is made from a low-strength, mild steel. Occasionally high strength rail lag bolts are required, so check your plans and specifications for the correct grade.
Hread length formula
Most imported rail lag bolts and domestically manufactured rail lag bolts will possess a thread length based on the following formula:
The minimum thread length shall be equal to one-half the nominal screw length plus 1/2″ or 6", whichever is less.
For extremely long rail lag bolts or for specific applications, custom rail lag bolts with extended threads may need to be manufactured.
Pointing
There are three kinds of points a rail lag bolt can have. These points are cone, semi-cone, and gimlet. Semi-cone points are the standard point portland bolt uses when manufacturing rail lag bolts. The gimlet point is typically reserved for only small-diameter bolts because they typically don't require a pilot hole to be drilled prior to installation.
Gimlet points are unnecessary for larger-diameter rail lag bolts because they require a pilot hole to be drilled prior to installation. This is because there would be too much torque required to screw in larger diameter rail lag bolts without a pilot hole.
Pilot holes
A pilot hole is a pre-drilled hole for the rail lag bolt prior to installation. This is used with larger-diameter rail lag bolts because it would require too much torque to screw in a larger-diameter rail lag bolt without the pilot hole.
The pilot hole is typically slightly smaller in diameter than the root of the threads. This is done to make installation easier while still facilitating the proper connection between the rail lag bolts and wood. An engineer should be consulted for questions regarding specific sizing and applications of pilot holes.
Cutting
The first stage of the manufacturing process is cutting the 20' round bar we stock to the proper length required to manufacture your rail lag bolt. In most cases, this is typically done by shearing the material. For small quantity runs or extremely long lengths, this is achieved by saw cutting.
Threading
For rail lag bolts, the threading process consists of using special chasers to cut the threads needed for the rail lag bolts. Cut threading is the process of cutting away the excess steel to create the threads.
Heading
The heads of the rail lag bolts are hot forged. This is the process of heating the end of the steel round bar and using an upsetter to forge the steel into the correct shape, typically hex or square. This is also the stage where the proper head markings are applied.
Pointing
While this is the stage normal hex-headed bolts would be chamfered, rail lag bolts are taken to get a semi-cone point. A semi-cone point will allow easy insertion of the rail lag bolt into the pilot hole. While this was covered earlier, cone and gimlet points are generally unnecessary for rail lag bolts since in most cases pilot holes are required to install the rail lag bolt.
Galvanizing
Rail lag bolts that will be exposed to the elements are often galvanized to provide corrosion resistance. Galvanizing rail lag bolts is the process of metallurgically bonding zinc to the steel and is performed.
10 Decorative Uses for Rail Lag Bolts
Add a rustic look
Rail lag bolt were first used to fasten barrels together and have been around for hundreds of years, so incorporating that handmade look into home decor projects adds a familiar, appealing element.
Rail lag bolt for a backyard deck
Outside spaces are often neglected when it comes to the little details. You need your fasteners to be sturdy, but they should also look great and hold up to all weather conditions.
Deckbuilding supplies are most often made of wood. Rail lag bolt are perfect for wood, are long and strong, and have durable threads that don't require nuts to secure them. Their hex head is perfect for securing the load your backyard deck requires and they don't require a secondary nut to secure.
Dress up an arbor or gazebo
Like decks, these outdoor gathering spaces often have exposed rail lag bolts where beams intersect. Garden arbors and gazebos are often romantic spots, draped in flowering vines, wine grapes, or other foliage.
Gazebos are often supplied with outdoor lighting and wired for stereo systems, perfect for a garden party or summer wedding! Using sophisticated finishing on your outdoor wood projects with fancy builder supplies completes the little details for these special spots.
Attach a handrail bracket
Stairs can be a focal point of many decor designs, but they need to be functional as well as draw the eye to where they lead to. Using sturdy rail lag bolts is essential for handrail safety and they should still fit into the overall design scheme.
Decorative bolts for the coffee table
Just take a glance at cozy home ideas on the web and you'll notice the rustic charm of exposed wood and metals. Square head rail lag bolt look great as an exposed bolt on classic, farmhouse-style furniture.
Hand finished bolts add style
A unique, optional finish for rail lag bolt to consider is the rusty metal patina. This finish is best on textured heads and creates a reddish rust effect. Perfect in a room with warm leathers, exposed beams, and brick.
Give hanging light fixtures some love
Hanging light fixtures from exposed beams looks great with large, rail lag bolts as part of their design. Showing off square, pyramid lag screws adds those old-world charm details that pull a room together.
Hold up that bookshelf
Rail lag bolt are incredibly strong. A decorative lag bolt is perfect for ensuring your book collection is kept safe on a sturdy surface.
Furniture for an industrial design theme often incorporates metal piping with unfinished or stained wood, while farmhouse-style bookcases are usually made of all wood. Both standing bookshelves, or ones built into the wall, require fasteners that can handle hundreds of pounds.
The fasteners used to hold the shelves to the back of the unit, or whatever the frame is, need to be able to withstand the load to keep it all together. If your rail lag bolts aren't strong enough or made for wood projects, that book collection could be tumbling to the ground!
Decorate with exposed beams
Exposed beams are one of the biggest showstoppers in interior design. They are the foundation for the modern country and farmhouse look that is so popular today.
When renovating or building a home that will incorporate exposed beams it is important to think of the overall design scheme. To make a room look brighter, keep the beams the same color you paint the ceiling. Using a rail lag bolt will enhance this contemporary design.
Mount a flat screen tv or anything heavy
You've made a big purchase for your tv and now you want to put it on the wall. To secure a heavy object, you'll need a fastener that can handle the job. One 1/4 rail lag bolt is capable of holding nearly 13,000 pounds!
To install a rail lag bolt, the materials that you're fastening need to be lined up. Once they are lined up, use a clamp to hold them together.
Next, you'll need to drill a hole that is a bit smaller than your bolt. The threads will grip into this hole and create a strong anchor. Rail lag bolts, with their hex head, require a ratchet to finish the job.
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Ultimate FAQ Guide to Rail Lag Bolt
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