Configuration A fasteners can be specified as heavy hex bolts, fully threaded studs, bent bolts, other headed bolts and rods with threads on each end or one end. Bolts and studs manufactured to the A specification require chamfered ends. The most common configurations for A fasteners are heavy hex bolts and fully threaded studs. Threads ASTM A is a related specification that covers a group of common requirements as they relate to the A specification. Section 13 of the A specification addresses thread form and class.
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Configuration A fasteners can be specified as heavy hex bolts, fully threaded studs, bent bolts, other headed bolts and rods with threads on each end or one end. Bolts and studs manufactured to the A specification require chamfered ends.
The most common configurations for A fasteners are heavy hex bolts and fully threaded studs. Threads ASTM A is a related specification that covers a group of common requirements as they relate to the A specification. Section 13 of the A specification addresses thread form and class. Certain grades within the A specification may also require an impact test.
Coatings Certain grades of A fasteners can be zinc coated per F hot-dip galvanized , B mechanically galvanized , or F zinc plated. Cadmium plating in addition to other coatings can performed on some grades as well. Allowance for the omission of product marking on very small diameter fasteners and makings in alternate locations are laid out in the A specification, but rarely come into play. Dual grade markings are allowed provided the fasteners meet all requirements of both specifications.
Dimensions Unless otherwise specified, headed bolts shall be heavy hex screw series with dimensions covered under ASME B Typically, fully threaded studs under the A specification are measured from first thread to first thread, rather than the overall length which includes the chamfered ends.
Supplemental Requirements Supplementary requirements of the A specification shall not apply unless specified in the inquiry and purchase order.
There are three Supplementary requirements under the A specification that include impact properties, lateral expansion and hardness testing for class 2 bolting materials. Contact Dan by phone, through our form , by email , or via chat if you have any questions.
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