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This page was created to answer some of the most common
questions about stainless steel and fasteners. If you have a question, please
email us for a speedy reply. If we don't know the answer, we will find someone
who does. |
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Just
a Class C part?
".....efficiency in production and manufacturing has increased,....design
errors are multiplied by factors measured in the millions. An ill conceived
pill or a negligently designed fastener, costing but a few cents each, can
place a huge corporation at risk [and] cause serious injury to individuals
whose claims cannot be resolved...." Judge Paul V. Niemeyer Remarks to
the Institute for Law and Economic Policy 39 Ariz I, Rev 719 (1997)
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Mechanical/ Chemical Properties |
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Stainless Steel Corrosion |
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| For fastener
specifications please visit the
"Products"
section |
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Information about 304 stainless by ASSDA
316 stainless |
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Corrosion Chart |
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Machine Screw Technical
Tapping Screw Technical |
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More Conversion Tables |
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PREN
Corrosion Rate Calculator |
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| Thread Info / |
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What
is 18-8 Stainless?
18-8 is used interchangeably when referring to 300 series stainless steel
having approximately 18% chromium and 8% nickel. It can characterize fasteners
made from 302, 302HQ, 303, 304, 305, 384, and XM7, among others. There is
little overall difference in corrosion resistance among these types, but
slight differences in chemical composition can make certain grades more resistant
than others against particular chemicals or atmospheres.
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Stainless Steel Recycling
Free multimedia presentation on the recycling of stainless steel. |
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Bolt Torque Guide
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| Metric Bolt Torque Guide |
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| More Technical |
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To find
weight of stainless steel anchor bolt, take diameter X diameter x 2.67 X
1.011 = lbs per feet of material
(more) |
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F593,
F594 - ASTM F593 is a specification for stainless hex head cap screws:
ASTM F594 is for stainless nuts. Compared to regular (18-8) stainless fasteners,
F593 and F594 call for: (a) tensile requirements about 20% higher than
that of commercial 18-8 or stainless hex caps and nuts to MS Specifications
(MS35307-8, MS34649-50); (b) both a minimum and a maximum tensile and hardness
requirements while commercial and MS fasteners do not have a maximum;
(c) chemical requirements that (eliminate) many commonly used mixtures of
300 or 18-8 stainless while allowing others. (courtesy Star Stainless
Screw)
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Full
Size Tests |
Machined
Specimen Tests |
Stainless
Alloy Group |
Condition |
Alloy
Mechanical
Property Marking |
Nominal
Diameter |
Tensile
Strength
ksi
c |
Yield
Strength
ksi
c/d |
Rockwell
Hardness |
Tensile
Strength
ksi
d |
Yield
Strength
ksi
c/d |
Elon-
gation
in 4D % |
303, 304,
305, 384, XM1, XM7,302Se |
CW1 |
F593
C |
1/4 to
5/8 |
100 to
150 |
65 |
B95 to
C32 |
95 |
60 |
20 |
CW2 |
F593
D |
3/4
to1-1/2 |
85 to
140 |
45 |
B80 to
C32 |
80 |
40 |
25 |
316 |
CW1 |
F593
G |
1/4 to
5/8 |
100 to
150 |
65 |
B95 to
C32 |
95 |
60 |
20 |
CW2 |
F593
H |
3/4 to
1-1/2 |
85 to
140 |
45 |
B80 to
C32 |
80 |
40 |
25 |
Condition
- CW - Hardened and rolled from annealed stock, thus acquiring a degree of
cold work, sizes .75 in and larger may be hot worked
<c> Yield Strength is the stress at which an offset of .2% gage length
occurs
<d> Machined from strain hardened stock
Extra Note - The industry standard of thread length of
twice the diameter + 1/4 or 1/2 (depending on the length) does not necessarily
apply on the F593 spec. If thread length is important, be sure to cover this
with your supplier)
This
information posted with written permission from ASTM.
For the entire ASTM F593 specification, please visit
ASTM Documents
other
info located
here
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