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 many differences between these two specifications. In order to understand these dissimilarities there are overviews of each specification below followed by a short summary of these variances. The fasteners under the ASTM A specification are designed to be used in axtm temperature or high pressure service, often in flanges and piping systems.
Headed fasteners in this specification require a heavy hex pattern head unless otherwise specified. Hot-forged headed stainless steel bolts under the A specification require solution annealing after forging to restore full corrosion-resistant properties.
If a scale-free bright finish is required, this must be specified in the purchase order.
The F aastm is more of a general purpose stainless steel specification used in all different applications. The headed bolts in the F specification require a standard hex head pattern as opposed to heavy hex unless otherwise specified.
Hot-forged headed stainless steel bolts under the F specification are manufactured to either Condition A or Condition CW which both require solution annealing after forging to restore full corrosion-resistant properties.
One primary difference between A and F hot-forged bolts is that F requires an asfm test for susceptibility 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 mechanical properties for these two alloy groups are listed below.
There are multiple differences between these two specifications. 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. There are varying mechanical properties between the two specifications along with configuration differences for headed bolts qstm varying thread pitch requirements.
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There are also additional testing requirements for F which are not required under the A specification. Do you have a job that requires A or F stainless steel fasteners? Give Portland Bolt a call — our experts are standing by to assist you with all of your stainless steel fastener needs. Your email address will not be published.
ASTM A193 vs ASTM F593
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