that looks pretty dang close to the body, or is it my old eyes?
as far as strength goes, does this help?
ASTM A193
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Scope
Originally approved in 1936, this specification is heavily utilized in petroleum and chemical construction applications. The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in
national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
Below is a basic summary of a few of the common grades. ASTM A193 covers a number of other standard specifications not covered in this description including B5, B6, and B16.
GRADES
B7Alloy steel, AISI 4140/4142 quenched and temperedB8Class 1 Stainless steel, AISI 304, carbide solution treated.B8MClass 1 Stainless steel, AISI 316, carbide solution treated.B8Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardenedB8MClass 2 Stainless steel, AISI 316, carbide solution treated, strain hardened
MECHANICAL PROPERTIES
GradeSizeTensile ksi, minYield, ksi, minElong, %, minRA % minB7Up to 2-1/2 12510516502-5/8 - 41159516504-1/8 - 7 100751850B8 Class 1All75303050B8M Class 1All75303050B8 Class 2Up to 3/412510012357/8 - 11158015351-1/8 - 1-1/41056520351-3/8 - 1-1/2100502845B8M Class 2Up to 3/41109515457/8 - 11008020451-1/8 - 1-1/4 956525451-3/8 - 1-1/290503045
RECOMMENDED NUTS and WASHERS
Grade
NutsWashersB7
A194 Grade 2HF436B8 Class 1
A194 Grade 8SS304B8M Class 1
A194 Grade 8MSS316B8 Class 2
A194 Grade 8, strain hardenedSS304B8M Class 2
A194 Grade 8M, strain hardenedSS316
Carbon steel has approximately 60% shear strength of its given tensile strength, not what that means for Stainless grades?