Shanghai Metal Corporation

One of the largest manufacturers & suppliers in China

Screws Configurations

NO. 10.67318.1000

Shanghai Metal has a wide range of industrial quality screws for the DIY and trade user, available through most hardware stores. Screws are made for many different applications. They are made for use on wood, sheet metal, drywall, concrete, and for general purpose use. They can be coated and rated for outdoor use. Screws have a pointed tip for installation and will basically "drill" their way into the material.

Screw Head Styles:

Full-bearing Washer-faced Doubled-chamfered Square
Flat or cap Hexagon Socket Phillips Raised Countersunk Countersunk Hexagon Socket Button Hexagon Socket
Countersunk Raised-countersunk Round Pan
Raised-cheese(Fillister) Mushroom(Truss) Cheese Slotted-hexagon
Phillips Round-pan Phillips Round Phillips Countersunk  

Types of Screws:

Name Characteristics
Dry wall screw Dry wall screws are shortened screws meant to hold sheet rock to wall studs.
Machine screw Machine screws are meant to apply two metal workpieces together with the use of a pretapped hole. They are threaded on the entire length of the shank, and usually have a countersink.
Chipboard screw Chipboard screws are extremely similar to dry-wall screws, but smaller and lighter due to their decreased responsibility.
Self-Drilling screws  Self-drill screws have a drill bit-like shank that can form a pretapped hole before the threads engage. They otherwise resemble sheet metal screws. Self-Drilling screws are also calledTEK screws.
Self-Tapping screw Self-Tapping screws have a very sharp thread for easy installment of metal to wood or fiberglass.
Set screw Set screws are headless, threaded rod segments that sit flushed with the penetrated material. Their most common use is in conjunction with shaft collars, or otherwise gripping an axis in perpendicular fashion. They are driven with recessed socket or flat heads.One is called Socket Set Screw.
Hex Socket Screw Hex Socket Cap screws have a fairly wide shoulder for holding fast to an object, but may not be threaded over their full body length. They come in a variety of head styles, and are designed to be inserted into tapped holes.
Lag screw Lag screws are self-tapping screws that meant to be applied with a wrench or socket. They are very strong, and are meant for a wide variety of materials.
Wood screw Wood screws have the intention of penetrating wood, but can be used in many easily-deformed materials. They are usually flathead, countersunk screws. 


Screw Drivers:

Phillips Slotted Phillips/Slot Six-lobe Six-lobe Tamper Six-lobe/Slot
Pozidriv Pozidriv/Round Hole Square Square/Slot Phillips/ Square Triangle
Y-Type Tri-wing S-type H-type Hexagon 5-Point
8-Point Spline Spanner Clutch Phillips/Slot.Ind Slot.Ind

Screw Tip Styles:

Name Features
Die point Die points have a slight chamfer, aiding the insertion into predrilled holes
Dog point Dog points have an extended, unthreaded chamfer to prevent stripping fine threads.
Rolled point Rolled points have a thread roll-over on the first 540° of the helix.
Pinch point A pinch point provides a pilot action when penetrating several thin materials.
Nail point A nail point is used to impinge or lock against wood materials.
Cupped point A cupped point increases its locking actuation under pressure.
Round point Round points provide gripping ability but do not 'cut' the way other screw tips do.
Cone point A cone point is very sharp and will provide an accurate pilot for threading.
Type-A point Type-A points are best utilized as replacement screws or with predrilled holes in thin metals.
Type-B point Type-B points are similar to Type A, but are meant for thick metals.
Type-AB Type-AB combines the precision point of Type A with the ruggedness of Type B.
Type-C point Type-C points are for use in heavy sheet metal and require a high driving torque.
Type-U point Type-U points are best employed by hammering or driving.
Type-F point  A type-F point has many cutting edges for tapping in large-gauge sheet metal.
Type-FZ point Type-FZ points have many cutting edges for tapping in plastic and other soft materials.
Type 1 point Type 1 points have a groove in the chamfer for general utility.
Type 17 point Type 17 points have a large groove in the shank for removing wood debris.
Type 23 point Type 23 points are similar to type 17, but have a finer thread and maximize their cutting surface.
Type 25 point Type 25 points are a hybrid between types 17 and 23 with a coarse thread.
Self-drilling Self-drilling screw tips are self-tapping and do not require predrilling.

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