Lengths of Joints
Joint length will vary with the application. Increasing wood costs have necessitated the development of shorter joints. Four and five millimeter joints are becoming more common in non-structural applications. Keep in mind that with very small joints, the finger joint machine and assembly components must be in top operating condition to facilitate the assembly of the joint.

Non-Structural Joints
Millwork, mouldings, trim, door, and window components, are some of the main uses for these joints. Typically 1/4" or 3/8" joints have been used, however, many users are finding that 4 or 5 mm joints will save enough material to pay for the cost of tooling conversion in a short time.

Structural Joints
Laminated beams and I-beams utilize the strength of the finger joint to produce load bearing components for an industry where joint strength is closely monitored and tested. Typically a 1-1/8" or 7/8" joint is used.

For sub-structural joints such as finger jointed 2X4 studs, a 5/8" joint is used.