Grade
6/6
This is a specific designation of a polyamide or nylon plastic. This lightweight material doesn't have corrosion problems, is non-magnetic, non-corrosive, non-toxic, non-flammable and non-conductive. It is much weaker than the SAE standard grade 2, yet great in low strength applications where weight is at a premium.
A
This grade is not on the SAE classification, but is similar in strength to Grade 1 or 2 on the SAE scale. This is a low strength grade.
B7
This chromium molybdenum steel has similar strength to SAE grade 5 fasteners, however, it is specifically used in high temperature and pressure applications. This grade is for fittings, flanges, valves, and pressure vessels. It is also used as threaded rod in concrete and epoxy.
B7M
This chromium molybdenum steel has similar strength to SAE grade 5 fasteners, however, it is specifically used in high temperature (up to 1000°F) and pressure applications. This grade has slightly less strength than its close relative grade B7, but has better corrosion resistance in sulfide and chloride rich environments. This grade is for fittings, flanges, valves, and pressure vessels. It is also used as threaded rod in concrete and epoxy.
B8 Class 1
304 Stainless Steel, carbide solution treated
B8M Class 1
With a tensile strength around 75,000 psi this grade is weaker than SAE grade 5, but stronger than SAE grade 2. Very similar to B8 it is specifically used in high temperature and pressure applications. This grade is for fittings, flanges, valves, and pressure vessels. Essentially this is 316 stainless steel, which is why this grade is ideal for corrosive environments.
B16
This chromium molybdenum vanadium steel has identical strength to B7 and is used in very high temperature (up to 1100°F). This grade is for fittings, flanges, valves, and pressure vessels. It is also used as threaded rod in concrete and epoxy.
L7
This chromium molybdenum steel has similar strength to SAE grade 5 fasteners. It is a low temperature grade for all purpose use.
L7M
This chromium molybdenum steel has similar strength to SAE grade 5 fasteners. It is a low temperature grade for all purpose use, that has been improved toughness and resistance to embrittlement and can meet NACE standards of use.
18-8
A general designation for the most common and popular stainless steel, (300 Series) referring to the 18% chromium and 8% nickel. It's strength has a range from the middle to low end of the grade scale. All 300 series stainless steel share the ratio of chromium to nickel with varying other elements improving different properties. It has higher corrosion resistance than the 400 series stainless steels and it is non-magnetic.
316
The second most common stainless steel grade, this material is stronger than grade 2, slightly weaker than grade 5,or generally as strong as medium to low carbon steel. It is on the low middle end of the grade scale. It is used in more severe corrosive environments than 304 stainless steel, as such it is used in more industrial settings, like process chemicals, textiles, bleaches, salt water and rubber. It is also used in surgical implants. The DIN/ISO denotation for a very similar grade is A4-70.
