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Ususally associated with the mechanical professions.  Wrenches use leverage to tighten and loosen mechanical fittings like bolts, nuts and couplings.

Open End Wrench:    A one piece wrench with a u-shaped opening at either end, usually canted at about 30 degrees to faciliate easier turning of bolts in tight places.   Either side of the u-shaped opening grips opposite faces of a nut.  Sometimes called a "Crescent Wrench"


Box End Wrench:  a one-piece wrench with an enclosed opening that grips the faces of the bolt or nut.

Combination Wrench:  a double-ended tool with one end being like an open-end wrench or open-ended spanner, and the other end being like a box-end wrench

Northern Industrial 14-Pc. Extra Long Wrench Set — SAE  

Racheting Box end Wrench:  A Box end wrench with an inner ratcheting gripping surface to allow turning of nuts and bolts in tight places without the need to remove the wrench for each turn.

 GearWrench™ 7-Pc. Ratchet Wrench Set, Model# 9317

Socket Wrench:   ses separate, removable sockets to fit many different sizes of nuts. It generally includes a ratcheting mechanism that allows the nut to be tightened or loosened with a continuous motion.

 Northern Industrial Tools Socket Set — 3/8in. Drive, 9-Pc. SAE Set

Adjustable Wrench:  used to loosen or tighten a nut or bolt, It has a "jaw" (the part into which the nut or bolt goes) which is of adjustable size, which allows for different size nuts and bolts to be handled by the same wrench.   

Northern Industrial 3-Pc. Adjustable Wrench Set  

Pipe Wrench:  The pipe wrench, or Stillson® wrench is an adjustable wrench used for turning soft iron pipes and fittings with a rounded surface. The design of the adjustable jaw allows it to rock in the frame, such that any forward pressure on the handle tends to pull the jaws tighter together.

Northern Industrial 3-Pc. Pipe Wrench Set  

Torque Wrench:  Used to apply a measued amount of force (or torque) to a fastener, usually a nut or bolt.   Used when bolt tightness is critical. 

SK Torque Wrench  — 1/2in., Model# 74251

Allen Wrench:    Used specifically to turn allen screws, which have a hexagonal shaped hole in the head.

22-Pc. Hex Key Wrench Set  

Torx Wrench:  Used specifially to turn Torx screws and bolts which have a star pattern in the head.

Titan Tamper-Resistant Torx® Key Set — 13 Pieces, Model# 12715  

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