ASTM A193 Grade B7
Chromium Molybendum steel, normally AISI 4140, heat treated to
28-32Rockwell Hardness, 125,000 PSI tensile strength, 105, 000 PSI
yield. It will hold itís strength to 1000 degrees F.
ASTM A193 Grade B7M
It has the same chemistry as B7. Physicals have max hardness of 235
Brinell or RC22. 100,000 PSI tensile and 80,000 PSI yield.
Used in areas where H2S is present.
ASTM A193 Grade B16
Chromium, molybendum, Vanadium steel. It has the same physicals as
B7. Added vanadium allows it to hold itís strength to 1100 degrees
ASTM A193 Grade B8
18-8 Grade stainless, non magnetic, good corrosion resistance.
75,000 PSI tensile strength. Same material as AISI type 304
ASTM A193 Grade B8M
This is similar to B8 fasteners except with added Molybdenum. It has
better corrosion resistance than B8. Hex Bolts, studs and other
fasteners are common to the B8M spec.
ASTM A193 Grade B8 (class 2)
Studs, bolts, and other fasteners found in this grade are considered
the same as B8 except strain hardened. This is a cold working
process which increases physical properties. 100,000-125,000 PSI
ASTM A193 Grade B8M (Class II)
Same as B8M except strain hardened, 90,000-125,000PSI Tensile
ASTM A193 Grade BC
18-8 grade stainless with additional element of Columbium- same as
type 347 type stainless steel.
ASTM A193 Grade B8T
18-8 grade of stainless with additional element of Titanium. Same as
type 321 Stainless Steel.
ASTM A193 Grade B6
This has the same chemistry as AISI type 410 stainless steel, but it
is heat treated. 110,000 PSI tensile strength.
ASTM A193 Grade B5
Fasteners under the B5 spec have the same chemistry as AISI type 501
SS but they are heat treated to 100,000 PSI tensile strength.
ASTM A320 Grade L7
Bolts, studs, and other fasteners under the L7 grade have the same
chemical and physical properties as B7. Additional requirement that
it meet a Charpy Test at 150 degrees F is needed. Such fasteners are
commonly used for low temperature service.
ASTM A320 Grade B8
Same in every way as A193 Grade B8.
ASTM A354 Grade BC
High strength bolts for normal atmospheric temperature. 125,000
tensile. Lacks alloying elements of B7.
ASTM A354 Grade BD
These hex bolts are the same as BC except they have a higher
Similar to A354 except has Manganese added, 90,000 to 120,000
tensile strength depending on size.
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