As correctly pointed out by ASimpson, there are classification of fits which are application specific. He lists the metric version, imperial are equivalents noting 1.0 inch = 25.4 mm. There are several good references on this, look to the web. But the Machinist Handbook does discuss this, at least in the 23rd edition.
How does Dhea work? DHEA is a parent hormone produced by the adrenal glands near the kidneys and in the liver. In men, DHEA is also secreted by the testes. It is changed in the body to a hormone called androstenedione. Androstenedione is then changed into the major male and female hormones.
1 In postmenopausal women and in elderly men: Doses of 25-50 mg daily are commonly used. 2  For treatment of schizophrenia: Increasing doses of DHEA of 25 mg daily for 2 weeks, 25 mg two times daily for 2 weeks, and 50 mg two times daily for 2 weeks. Withdrawal symptoms. 2  Early research shows that taking 100 mg of DHEA daily together with standard therapy for 12 months does not improve symptoms of drug withdrawal in people addicted to heroin. 3  Taking 100 mg of DHEA daily for 12 weeks also did not improve symptoms of cocaine withdrawal.