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ASTM A194 GR.8美制高強度六角螺母

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ASTM A194 GR.8
ASTM A194 pecification covers a variety of carbon, alloy, and martensitic and austenitic stainless steel nuts. These nuts are intended for high-pressure or high-temperature service, or

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ASTM A194 GR.8

ASTM A194 pecification covers a variety of carbon, alloy, and martensitic and austenitic stainless steel nuts. These nuts are intended for high-pressure or high-temperature service, or both. Bars from which the nuts are made shall be hot-wrought.
According to ASTM A194 the material may be further processed by centerless grinding or by cold drawing. Austenitic stainless steel may be solution annealed or annealed and strain-hardened. Each alloy shall conform to the chemical composition requirements prescribed. Hardness tests, proof of load tests, and cone proof load tests shall be made to all nuts to meet the requirements specified.
ASTM A194 stated in either inch-pound units or SI units are to be regarded separay as standard. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. Within the text, the SI units are shown in brackets.
ASTM A194 covers size range ? through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range ? in. and M6 nominal and above.
Unless otherwise specified, the American National Standard Heavy Hex Series （ANSI B 18.2.2） shall be used. Nuts up to and including 1 inch nominal size shall be UNC Series Class2B fit. Nuts over 1 inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 grade 2H nuts are common in the marketplace