This article is about the clamp used to hold together two workpieces. For clamps used to secure stage lighting instruments, see C-clamp (stagecraft) . For the Chicago band, see C-Clamp (band)
A C-clamp or G-clamp or G-cramp is a type of clamp device typically used to hold a wood or metal workpiece, and often used in, but are not limited to, carpentry and welding. Often believed that these clamps are called "C" clamps because of their C-shaped frame, or also often called C-clamps or G-clamps[1] because including the screw part, they are shaped like an uppercase letter G. However, in fact, they were originally called a carriage maker's clamp, or Carriage Clamp.
An open G-clampDescription
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C-clamps or G-clamps are typically made of steel or cast iron, though smaller clamps may be made of pot metal. At the top of the "C," is usually a small flat edge. At the bottom is a threaded hole through which a large threaded screw protrudes. One end of this screw contains a flat edge of similar size to the one at the top of the frame, and the other end usually a small metal bar, perpendicular to the screw itself, which is used to gain leverage when tightening the clamp. When the clamp is completely closed, the flat end of the screw is in contact with the flat end on the frame.[2] When the clamp is actually used, it is very rare that this occurs. Generally, some other object or objects will be contained between the top and bottom flat edges.
Usage
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A G-clamp is used by means of turning the screw through the bottom of the frame until the desired state of pressure or release is reached. In the case that the clamp is being tightened, this is when the objects being secured are satisfactorily secured between the flat end of the screw and the flat end of the frame. If the clamp is being loosened, this is when a sufficient amount of force is released to allow the secured objects to be moved.
Two c-clamps in useWoodworking
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While a G-clamp is a useful tool for woodworking, special care should be taken when working with any woods. The flat gripping edges of the frame, generally no larger than half an inch or a centimeter (depending on the size of the clamp) can cause indentations and marring of the surfaces being clamped. This can be avoided by buffering between the clamp and the timber using two pieces of scrap wood. As each piece of scrap wood is directly in contact with the flat edges of the frame and with the items being clamped, this allows the scrap wood to receive the damage from the clamping, while dispersing the clamping force across the piece of scrap wood into the clamped objects. Deep-throated clamps are also available and provide greater reach for smaller jobs.
Stage Lighting
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see C-Clamp (stagecraft)
C-clamps are frequently used to hang stage lighting instruments.
See also
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References
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Who would have guessed that holding two pieces of material together could get so complicated? With countless variations of clamps, it can get hard to keep track of which one to use for your job. There are clamps for metal working, wood working, lifting, and special occasions.
Rules for clamping:
Dimide Clamp:
The Dimide Clamp is a heavy-duty metalworking & welding clamp that specializes in combining speed and power through impact wrench compatibility. Designed for the high torque loads applied by an impact wrench, the Dimide Clamp is a reliable clamp that is perfect for squeezing parts together, preventing part-slippage, removing the clamp bottleneck from a production line and more. The Dimide Clamp also has both a removable T-handle and a hex head. This allows the clamp to be easily adjustable while fitting in tighter gaps and for using a large variety of drivers including ratchets, impact wrenches, torque wrenches, breaker bars and more. The clamp also comes with a copper plated screws and feet and zinc plated plates. This preserves the clamp by preventing weld spatter build up and rusting.
Ideal for:
Dimide Long Series Clamps:
The Dimide Long Series Clamp is the ultimate clamp when you need long reach capabilities. Offering interchangeable arms with up to 60 inches f reach you can meet the reach demands of any project. The t-handle shoe provides mechanical advantage to get great force even at long reach. Providing excellent torsional stiffness through a rigid body and rectangular tubing arms. The fail-safe shear bolt prevents the clamp from breaking due to over tightening.
Ideal for:
C-Clamp (Aka G-Clamps):
The popular C-Clamp is the standard go-to clamp for many occasions. Its simplicity and availability are unmatched. Every clamp collection starts with a few sizes of C-Clamps. Due to the popularity of the C-Clamp, various designs are available for different occasions.
These designs include:
Ideal for:
F-Clamps (aka Bar Clamps)
The f-clamp is designed for a wide opening capacity. The f-clamp has a slider bar that allows the opening capacity to be easily adjusted to satisfy a wide range of applications. This has made the f-clamp another very popular clamp and is used when a C-Clamp's opening capacity is too small.
Ideal for:
Pipe Clamp Fixtures
The pipe clamp is similar to the f-clamp, except instead of using a sliding bar it uses to a sliding pipe. This allows for the pipe clamp to fit any opening capacity you need as long as you have the appropriately sized pipe.
Ideal for:
Parallel Clamps
Also similar to the f-clamp, the parallel clamps allow for large opening capacities. Ideal for woodworking, the clamp jaws remain parallel under increased loads to give a large distribution area and prevent leaving dimples in the wood.
Ideal for:
Quick Action Clamps
Quick grip or quick action clamps are very popular today. They can be tightened using one hand by pumping the push handle. They are also similar to f-clamps in that their clamp opening capacity can be varied.
Ideal for:
Locking Clamps
Locking clamps are another very popular clamp. They are fast and be used one handed making them ideal for welding.
Ideal for:
Sheet Metal Clamps
Sheet metal clamps are similar to locking clamps, except they have a large surface area at the clamp jaws which make them ideal for clamping sheet metal and similar materials.
Ideal for:
Locking Chain Clamps
The locking chain clamp is similar to the locking clamp but allows for applying a clamp load in tight spaces since you can squeeze the chain in and around a pipe or anything else that is near another surface. The chain also allows the it to clamp a variety of shapes because it will wrap around the object and apply pressure when the chain is tightened.
Ideal for:
Kant-Twist Clamps
A favorite by many machine shops and welders, the Kant-twist clamp delivers load using two parallel jaws, preventing the jaws from walking. The handle positioned perpendicular to the clamp load also prevents the clamp from twisting (Kant-twist) while being tightened.
Ideal for:
Wood Hand Screw Clamps:
The wood hand screw clamp is a traditional woodworking clamp. The jaws pivot to allow clamp at varying angles.
Ideal for:
Spring Clamps
Spring clamps are fast and very affordable. However, they deliver little clamp load and have a very limited opening capacity. This makes them ideal for holding down a tarp or preventing movement in one axis that isn't receiving any load.
Ideal for:
Sash Clamps
Similar to parallel clamps, Sash clamps are used to glue up wide panels and large assemblies.
Ideal for:
Bench Clamps (aka toggle clamps)
Bench clamps screw down onto work tables. This allows for quick clamping of an assembly. They are ideal for use with a wood table and can also be used with other tables through the use of attachment accessories.
Ideal for:
Miter Clamps (aka Corner Clamp)
The miter clamp is ideal for connecting corners together for assemblies.
Ideal for:
Picture Frame Clamps
The picture frame clamp is ideal for clamping together rectangular assemblies such as picture frames, table supports, window frames and more.
Ideal for:
Edge Clamps
With three separate screws, the edge clamp can control its position in two axes. This makes the clamp ideal for holding down parts for a butt-weld or for gluing an assembly.
Ideal for:
Cabinetry Clamps
The cabinetry clamp aligns two adjacent cabinets so that the face frames are flush, allowing you to screw them together. They achieve this by applying clamp load in two axes.
Ideal for:
Table Clamps
The table clamp is to be used with an accompanying welding table. These are used for welding assemblies and allow for single handed clamping with speed.
Ideal for:
Web Clamps (aka strap or band clamps)
Web clamps are best for awkward shapes. The corners are used to lock into the band to apply a load to the assembly. These clamps are used primarily for woodworking of furniture.
Ideal for:
Beam Clamps
Beam clamps are used for lifting steel beams and plate.
Ideal for:
Scissor Clamps (aka slab tongs)
The scissor clamp is another lifting clamp. Through the use of its scissor action, this clamp exploits the weight of what is being lifted to apply clamping load. The clamp also provides rough clamping jaws to better dig into the part it is lifting and improve its grip.
Ideal for:
Vertical Plate Lifting Clamp
This clamp employs rotating teeth that use the weight of what is being lifted to apply an increased load, preventing plate from slipping.
Ideal for:
Pneumatic Power Clamps
Pneumatic power clamps use compressed air to apply a clamping load. These clamps are used for production runs and machinery.
Ideal for:
Hydraulic Clamps
Similar to pneumatic clamps, except these use hydraulic power or pressurized liquid to apply a clamping load.
Ideal for:
Hose Clamps
Hose clamps are used to seal a hose onto a fitting. These are popular for irrigation or automobile hoses.
Ideal for:
Cable Clamps
Cable clamps are used to hold cable along a path.
Ideal for:
Ground Clamps
Grounding clamps are highly conductive and used to ground electrical current.
Ideal for:
Know any clamps or clamping guidelines we missed? Please comment below and we will be sure to update this list!
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