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 Illustrations of Basic Thread Geometry
Unified Inch Screw Threads per Federal Standard
Inch "J" Series Screw Threads per Military Standard
Metric Screw Threads per Federal Standard
Tolerance and Allowance Grades
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View a printable version of the following charts and information. (PDF, 284.48 KB)
These simplified drawings of an external and internal thread will
illustrate basic thread geometry. They make it possible to visualize
the critical dimensions which must be controlled for correct thread
form.
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Please note: The most common tolerance and allowance grades for standard series threads are shown in bold print and a larger font size.
STANDARD ALLOWANCE GRADES:
- Internal Threads G and H shown as capital letters.
- External Threads, e, f, g, and h shown as lower case letters.
STANDARD TOLERANCE GRADES:
- Internal Threads
Pitch and Minor Diameter 4, 5, 6, 7, and 8.
- External Threads:
Pitch Diameter 3, 4, 5, 6, 7, 8, and 9.
Major Diameter 4, 6, and 8.
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