What is a Spline Wrench

A spline wrench is a type of socket tool used to tighten and loosen nuts and bolts. It has a unique shape with six symmetrical sides and each side has multiple teeth or grooves, making it ideal for use on fasteners that have round, square, hexagonal or other non-standard shapes. The main advantage of using a spline wrench is that the user can easily adjust the torque applied to the nut or bolt without having to remove it from its place.

This makes working with different types of nuts and bolts much easier than traditional tools like ratchets and spanners. Spline wrenches are also easy to carry around due to their small size and light weight.

A spline wrench is a specialty tool designed to work with fasteners that have a splined drive, such as those found on some faucets, shower heads and other plumbing fixtures. The spline wrench is designed with a series of teeth that fit into the grooves of the fastener head so it can be tightened or loosened without slipping off. It’s an essential tool for any plumber or DIYer who needs to tackle these types of jobs.

Let's Settle This! What Wrench & Socket Design Will Slip 1st?

Spline Wrench Vs 12 Point

A spline wrench and a 12 point wrench are both tools used to loosen and tighten fasteners. A spline wrench has six or more points, which provide greater contact with the fastener head than a 12 point wrench, so it offers increased torque when loosening and tightening. The 12 point wrench also provides greater contact with the fastener head but usually requires less force because of its shallow design, making it better suited for delicate applications where precision is required.

What is a Spline Wrench

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Is Spline the Same As Torx?

No, spline and Torx are two different types of fasteners. Splines are a type of rounded key-like fastener with ridges or teeth along the sides that fit into a matching hole in the object that is being secured. Splines provide extra grip to ensure a secure connection between two objects.

On the other hand, Torx screws are star-shaped fasteners that have six pointed ends and require a special tool for installation and removal. They provide more security than standard hex-head screws by making it harder for someone to remove them without using their unique tools. While both offer an additional level of security, they are not interchangeable as each requires its own unique tooling system for installation and removal.

What Does a Spline Socket Mean?

A spline socket is a specialized tool used to remove and replace fasteners that have a unique drive shape, such as those found in wheel lug nuts. The socket has an inner surface with multiple grooves or ‘splines’ that match the head of the fastener and allow it to be securely attached and removed. Spline sockets are designed for high torque applications, making them perfect for removing stuck wheel lugs without damaging the rim or studs.

There are many different types of spline sockets available depending on the size and type of fastener being used, but all provide a secure grip while allowing you to easily apply large amounts of force safely. Additionally, they can often be used in lieu of other tools like wrenches or impact guns when working on delicate components like alloy wheels where damage needs to be minimized as much as possible.

What Uses Spline Drive?

Spline drive is a type of power transmission that uses splined shafts to transfer torque and rotational motion between two or more components. It is commonly used in many engineering applications such as hydraulic pumps, industrial machinery, gearboxes, transmissions, crankshafts and other rotating parts. Spline drives are beneficial due to their ability to provide zero backlash for high precision applications which require smooth operation over long periods of time.

Additionally, the use of splines can reduce the number of components required for an assembly resulting in cost savings as well as improved reliability and performance. Furthermore, compared to traditional keyed connections which can be prone to wear over time; splines offer greater surface contact providing superior strength and durability. In conclusion, spline drive offers numerous advantages when it comes to transferring torque from one component to another making it a popular choice among engineers across various industries.

Where are Spline Fasteners Used?

Spline fasteners are a variant of the traditional nut and bolt assembly. They’re used in applications that require extra strength due to their unique design which allows them to have greater tensile and shear strength than regular nuts and bolts. Splines are also helpful for non-rigid connections, as they provide improved resistance against screw loosening caused by vibration or shock.

The most common uses for spline fasteners include automotive parts such as transmission control systems, door hinges, suspension components, drive shafts, steering columns and steering racks; industrial equipment like conveyors, agricultural machinery and construction machines; aerospace components such as landing gear assemblies; marine hardware like rudder locks; furniture fittings including bed frames and even medical devices like orthopedic implants. Splines can be made from a variety of materials including steel, brass or aluminum alloys depending on the application requirements.


In conclusion, a spline wrench is an important tool that can be used to fix or tighten various objects. It is designed with a unique shape and has multiple grooves that provide more grip than other types of wrenches. Spline wrenches are relatively inexpensive and often come in sets so they can be easily stored when not in use.

This makes them ideal for anyone who needs to work on projects at home or around the shop.

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