Rod diameter threads per inch.
Grade 8 threaded rod strength.
Mass and weight the difference.
Black oxide steel threaded rods have a dark surface color and are corrosion resistant in dry environments.
Computed by multiplying the proof load stresses and tensile strengths stresses by the stress area of the thread.
As 0 7854 d 0 9743 n squared.
All america threaded products will dual certify to astm a354 bd and sae j429 grade 8.
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The threads per inch tpi also varies on the diameter of the rod as follows.
Proof load tensile strength for grade 2 5 8.
Astm a354 bd is used for structural bolts while sae j429 grade 8 is an automotive specification.
Threaded rods proof load capacities in metric units.
Threaded rod tds version date.
With a minimum tensile strength of 150 ksi and minimum yield of 130 ksi grade 8 has a greater tensile and yield strength compared to other steel grades such as grade 2 grade 5 and b7.
Grade 8 has 0 28 0 55 carbon 0 030 max phosphorus and 0 050 max sulfur.
It is also quenched and tempered at 800 f leading to its strength.
Note that hangers supporting steam water air or gas piping systems should be able to carry the weight of piping insulation valves and other equipment.
Astm a354 is the classification for grade 8 threaded rod made of high strength steel quenched and tempered.
High strength steel threaded rods.
Zinc yellow chromate plated steel threaded rods resist corrosion in wet environments.
There are astm specifications that have similar strength properties which may be easier to find in the form of all thread rod than their sae equivalent.
Where d equals nominal diameter in in.
For proof load yield and tensile strength values for threaded rod refer online to the astm sae and iso mechanical requirements for steel fasteners chart or the industrial fastener institute website and handbook which can be found in resources.
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All america threaded products will dual certify to astm a354 bd and sae j429 grade 8.
Common finishes include plain black zinc plated and hot dip galvanized for.
Sae threaded rods do not require permanent grade markings on the ends of the rods like many astm specifications do.
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And n equals thread per inch.
1 the maximum loads in the table above are based on allowable tensile stress of 12 kpsi reduced by 25 to 9 kpsi allowable stress.
