This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Geometrical Analysis of Hole Sizes for Thread-Forming Screws
Annotation ability available
Sector:
Language:
English
Abstract
The practicability of specific hole sizes is known to be influenced by power tool dynamics, material characteristics, finishes, and screw type. Less attention has been paid to resulting internal thread geometry. Historically the engineer controlled tapped hole thread geometry by appropriate thread form specifications. The advent of thread-forming screws has seriously limited his direct knowledge of internal thread geometry. This paper derives the important geometrical parameters for internal threads produced by thread-forming screws. Equations relate internal thread geometry to external thread form and hole size. Without complete standards for thread-forming screws, the technique is illustrated for a Type C and a sharp crested nonstandard thread form. Percent thread and percent volume filled between threads are given by charts.
Recommended Content
Aerospace Standard | BEARING, ROLLER, NEEDLE, SINGLE ROW, THIN SHELL TYPE II, ANTIFRICTION, INCH |
Aerospace Standard | Wrenches, Hand, Twelve Point, High Strength, Thin Wall |
Technical Paper | Energy Generation and Stir Zone Dimensions in Friction Stir Spot Welds |
Authors
Citation
Lawser, J., "Geometrical Analysis of Hole Sizes for Thread-Forming Screws," SAE Technical Paper 690056, 1969, https://doi.org/10.4271/690056.Also In
References
- “Tool Engineers Handbook.” 1949 798