Editorial Technical Reference

Self-Tapping Screw

This page explains how Self-Tapping Screw is classified within Fabricated Metal Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A self-tapping screw is a fastener that creates its own mating thread when driven into a pre-drilled hole in materials like metal, plastic, or wood.

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Product Specifications

Technical details and manufacturing context for Self-Tapping Screw

Definition

Self-tapping screws are widely used in automotive, electronics, construction, and appliance assembly where they provide a secure fastening without the need for a separate nut or tapping operation. They are specified by thread type (e.g., ST, TT), diameter, length, head style, drive type, and material grade. Grades are distinguished by hardness, corrosion resistance, and the ability to cut or form threads in different substrate materials, with higher grades offering better performance in harder materials or demanding environments.

Working Principle

The screw has a sharp thread that cuts or forms a mating thread in the substrate as it is driven. The thread geometry and hardness allow it to displace or remove material, creating a tight fit that resists loosening. The screw's design ensures that the thread engages progressively, reducing driving torque and preventing damage to the workpiece.

Common Materials

Carbon steel (e.g., 1022, 10B21), Stainless steel (e.g., 304, 410), Alloy steel (e.g., 4037), Brass, Aluminum

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thread Size	ST2.2–ST8.0 mm	Nominal thread diameter range for standard self-tapping screws.ISO 1478
Length	4–100 mm	Typical length range; custom lengths available.ISO 1478
Thread Pitch	0.8–2.5 mm	Pitch varies with thread size.ISO 1478
Hardness	HV 450–560 HV	Core hardness for carbon steel screws.ISO 898-5
Tensile Strength	800–1200 MPa	Typical tensile strength for hardened carbon steel.ISO 898-5
Surface Finish	Zinc plating, black oxide, phosphate	Common finishes for corrosion resistance.ISO 4042
Corrosion Resistance	72–500 hours	Salt spray test duration depending on coating thickness.ISO 9227
Drive Type	Phillips, Pozidriv, Torx, Hex	Common drive configurations.
Head Type	Pan, flat, oval, truss	Standard head styles per ISO 1478.
Point Type	Type AB, B, C	Point style determines cutting vs. forming ability.ISO 1478
Thread Forming Torque	0.5–5.0 N·m	Typical driving torque for sizes ST3.5–ST6.3.
Pull-out Strength	200–1500 N	Depends on substrate and screw size.
Tolerance	±0.05 mm	Diameter tolerance for thread sizes up to ST8.ISO 1478
Operating Temperature	-40 to 120 °C	Typical range for coated carbon steel.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Self-Tapping Screw.

Published Manufacturer Relationships

Source-reviewed profile relationships currently associated with Self-Tapping Screw

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Data Basis

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Preliminary Technical Classification

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