Specialty Fasteners

Supply TypeManufacturer, Exporter, Supplier, Retailer
Preferred Buyer Location All over the world

SCREWS are basically classified under 3 major types or categories: MACHINE SCREWS - needs a pre-tapped hole - most commonly used TAPPING SCREWS - needs the hole to be drilled pierced, but....

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Techtran Electronics (India) Pvt. Ltd.

Park Street, Kolkata, West Bengal

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Member Since 16 Years
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SCREWS are basically classified under 3 major types or categories:

MACHINE SCREWS - needs a pre-tapped hole - most commonly used
TAPPING SCREWS - needs the hole to be drilled pierced, but not tapped - typical types are taptite screws (used on soft metal or casting), plastite screws (used for plastic) or High-Low screws (normally used on sheet metal). - need to specify the type of point for leading the screw into the hole e.g. type BT, type C or F „
DRILLING SCREWS - do not need a hole (but for positional accuracy, a pilot point is recommended) - typically used in construction industries - drilling screws consists of a drill bit tip followed by a tapping screw body. - eliminates the need to bring work piece to the drill bench to prepare hole.

A SEM is an assembly consisting of a screw with one or more washers.

Features :

How to specify a screw (basic requirement)

Head type e.g. Pan head
Type of drive e.g. Cross Recess
Thread used e.g. M3 or 6-32
Length needed e.g. 10 mm or 0.5" (note: do not mix metric length and unified thread sizes)
Type of screw e.g. taptite or machine screws or a SEM
Material used e.g. Low carbon steel (LCS)
Plating (if any) e.g. zinc clear

Optional :