What are the differences between F and A stainless steel F bolts require ASTM F hex nuts in the matching stainless steel type. or visit us at ASTM F Scope – This specification covers the chemical and mechanical requirements for stainless steel. ASTM F specifications covers chemical and mechanical requirements for stainless steel bolts, hex cap screws and studs ranging from 1/4 to /2.
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There are multiple differences between these two specifications.
What are the differences between F and A stainless steel headed bolts? Leave a Reply Cancel reply Your email address will not be published. Your email address will not be published. AF – Headed and rolled from annealed stock and then reannealed AH – Solution annealed and age hardened after forming.
ASTM F – 17 Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs
This specification covers the requirements for stainless steel bolts, hex cap screws, and stud bolts in imperial size 0. There are many differences between these two specifications. AF – Headed and rolled from annealed stock and then reannealed AH – Asttm annealed and age hardened after forming CW – Headed and rolled from annealed stock thus acquiring a degree of cold work.
SH – Machined from strain hardened stock or astj worked to develop the specific properties. The fasteners under the ASTM A specification are designed to be used in high temperature or high pressure service, often in flanges and piping systems.
A Where options are given, all the tests under an option shall be performed. If a scale-free bright finish is required, this must be specified in the purchase order. A Tensile stress areas are computed using the following formula: In order to understand these dissimilarities there are overviews of each specification below followed by a short summary of these variances. B Tests that are not mandatory C Special fasteners are those fasteners with special configurations including drilled heads, reduced body, etc.
E When approved by the purchaser, alloy F may be asstm. Hex head, ashm head and hex socket cap screws.
ASTM A193 vs ASTM F593
There are varying mechanical properties between the two specifications along with configuration differences for headed bolts and varying thread pitch requirements. F When approved by the purchaser, alloys or Se may be furnished. A Unless otherwise specified on the inquiry and order, the choice of an alloy from asmt a group shall be at the discretion of the fastener manufacturer B See section 4.
Option A tests should be made whenever feasible. Special fasteners have full size heads shall be tested as specified for stud bolts and other bolts. f93
A – Machined from annealed or solution annealed stock thus retaining the properties of the original material; or hot formed and solution annealed. There are also additional testing requirements for F which are not required under the A specification. B legend of conditions: Headed fasteners in this specification require a heavy hex pattern head unless otherwise specified.
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The F specification is more of a general purpose stainless steel specification used in all different applications. ASTM F covers seven groups of stsinles steel alloys, including twelve austenitic, two ferritic, four martensitic and one precitipitain hardening.
The A specification is designed for use in high-temperature, high-pressure applications whereas F is used as more of a generic, all-purpose use fastener. The mechanical properties for these two alloy groups are listed below. D When approved by the purchaser, alloysSe, or XM1 may be furnished.
One primary difference between A and F hot-forged bolts is that F requires an additional test for f53 to intergranular corrosion, which the A specification does not. This test adds to both the cost and lead time to produce this grade of stainless headed bolt. The headed bolts in the F specification require a standard hex head pattern ff593 opposed to heavy hex unless otherwise specified.
A Minimum values except where shown as maximum or as a range.
Do you have a job that requires A or F stainless steel fasteners?