Specifications:
The document provides specifications for SF series expansion inserts, detailing part numbers, thread sizes, maximum external diameters, lengths, number of splined fins, and recommended hole diameters. For example, part number SF020H035 has a thread size of M2.0, a maximum external diameter of 3.90 mm, and a length of 3.50 mm.

Applications:
SF inserts are recommended for use in wood and composite materials. Their geometric shape and sharp fluted fins help prevent substrate splitting and reduce screw installation torque compared to FV type inserts.

Recommendations:
It is advised that slight modifications to hole dimensions may be necessary depending on the material used. Ensuring sufficient hole depth is crucial for optimal expansion, allowing the screw to pass completely through the insert.

Guidance:
The information provided is for guidance only. Designers are encouraged to request samples to verify the suitability of the specifications for their specific applications.