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Wood Construction Connectors Fastening Identification Guide/Hole Types

These hole types are used on various Simpson Strong-Tie connectors.

Round Holes

Round Holes

Purpose: to fasten a connector.
Fill Requirements: always fill, unless noted otherwise.
Obround Holes

Obround Holes

Purpose: to make fastening a connector in a tight location easier.
Fill Requirements: always fill.
Hexagonal Holes

Hexagonal Holes

Purpose: to fasten a connector to concrete or masonry.
Fill Requirements: always fill when fastening a connector to concrete or masonry.
Triangular Holes

Triangular Holes

Purpose: to increase a connector's strength or to achieve max. strength.
Fill Requirements: when the Designer specifies max. nailing.
Diamond Holes

Diamond Holes

Purpose: to temporarily fasten a connector to make installing it easier.
Pilot Holes

Pilot Holes

Tooling holes for manufacturing purposes. No fasteners required.
Speed Prongs

Speed Prongs

Used to temporarily position and secure the connector for easier and faster installation.
Positive Angle Nailing (PAN)

Positive Angle Nailing (PAN)

Provided when wood splitting may occur, and to speed installation.
Dome Nailing

Dome Nailing

This feature guides the nail into the joist and header at a 45° angle.
U.S. Patent 5,603,580
Double-Shear Nailing

Double-Shear Nailing

The nail is installed into the joist and header, distributing the load through two points on each joist nail for greater strength. Double-shear nailing must be full-length catalog nail.
ITS/IUS Strong-Grip

ITS/IUS Strong-Grip

The Strong-Grip™ seat allows the I-joist to "snap" in securely without the need for joist nails.