Screw Points & Thread Styles

Point/Thread Styles The point styles on a screw serve the purpose of tapping, cutting or drilling through the desired material. There are five main screw point categories: Tapping screws – tapping screws get their name because they “tap” their own mating threads.  Some tapping screws require a hole while others are self-drilling. They are identified

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Drive Styles

The drive style refers to the installation tool used.  The most common are the Phillips, slotted, a combination of both (Phillips and slotted), and hex (hexagon).  Using the correct sized slotted screwdriver or hex key prevents head damage.  For hex cap screws, use a wrench made for square head bolts and screws.  Selecting an uncommon

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Carriage Bolts

Carriage Bolts

ASTM A307-Grade A Carriage bolts are used to fasten metal to timber.  The square shoulder under the rounded head helps hold the bolt in place once tightened.  Carriage bolts come in a variety of sizes and materials such as:  Zinc-plated:  Better corrosion resistance Grade 5 Steel:  Most commonly used in automotive industry Stainless Steel 18-8: 

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SPECIALTY SELF-DRILL SCREWS

SPECIALTY SELF-DRILL SCREWS

Hex Head Self-Drill Thin Wafer Plymetal Self-Drill With Wings  Use a #4 point for metal to steel applications up to 3/8”thick. #5 point for metal to steel up to 1/2” thick.  For attaching plywood to metal. • Wings bore out and relieve wood chips before breaking off at metal. • Zinc plated #3 point. #2

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FASTENERS – BOLTS

Bolts are one of the most commonly used fasteners in construction and machine design. You can find them in everything from electric toothbrushes and door hinges to concrete pillars in buildings. Bolts come in a wide array of shapes and sizes, but the production process remains the same. It begins with cold forging steelwire into

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STANDARD NUTS—COARSE AND FINE THREAD

STANDARD NUTS—COARSE AND FINE THREAD

HEAVY HEX NUTS Compared to Hex Nuts, the Heavy Hex series is wider by 1/8″ across flats. This provides a number of advantages. Heavy Hex Nuts can span eccentric or oversize bolt holes. They offer increased bearing area to support higher bearing stresses;and they have thicker walls to control nut dilation under load. These effects

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Screws and Bolts

FLAT HEAD CAP SCREW This fastener is a quality, close tolerance product with dimensions conforming to USASI B18.6.2. Made of Grade 2 steel, it provides a tensile strength of 74,000 psi. The flat countersunk head has an accurately milled slot for holding or tightening with screwdriver. Available from stock in diameters from 1/2 through 3/4

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