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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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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