Stainless Steel 304L Fasteners
Essentially, fasteners are a kind of hardware device that joins two or more objects together mechanically. Produced in different alloy grades, one of the most common grades of fasteners is grade 304. Generally, Stainless Steel 304L Fasteners can be used to create a non-permanent joint. This means that these joints could be easily removed or they could be dismantled without causing any damage to the components being joined.

However, in some instances, a permanent joining would be required, especially in those applications where a temporary joint is not considered to be sufficient. This is why SS 304L stud bolts, are used. Apart from having good mechanical and weldability properties, this particular alloy has modified chemistry which serves the purpose by increasing its weldability. In the case of Stainless Steel 304L Nuts, the modification in its chemistry would be the lowering of carbon content and increasing the content of nitrogen in its alloy.
While a low carbon content plays a very important role in the weldability of the SS 304L threaded rod, this change can actually reduce the strength and mechanical properties of the alloy. Hence it would become a structurally weak alloy. In order to combat this issue, a substantial content of nitrogen is added to the alloy, thus restoring the mechanical properties almost to its previous state. Since Nitrogen stabilizes the austenite in UNS S30403 bolts and increases the hardenability of the alloy. Furthermore, the yield strength and resistance to pitting are also properties that are enhanced in the SS 304L hex bolt with the addition of nitrogen.
Sizes of Bolts (Inches) |
Threads/ Inch |
Standard Dry Torque (Inch-Pounds) |
304L
Stainless Steel |
||
#2 | 56 | 2.5 |
64 | 3.0 | |
#3 | 48 | 3.9 |
56 | 4.4 | |
#4 | 40 | 5.2 |
48 | 6.6 | |
#5 | 40 | 7.7 |
44 | 9.4 | |
#6 | 32 | 9.6 |
40 | 12.1 | |
#8 | 32 | 19.8 |
36 | 22.0 | |
#10 | 24 | 22.8 |
32 | 31.7 | |
Sizes of Bolts (Inches) |
Threads/ Inch |
Standard Dry Torque (Inch-Pounds) |
304L SS |
||
1/4 | 20 | 75.2 |
28 | 94.0 | |
5/16 | 18 | 132 |
24 | 142 | |
3/8 | 16 | 236 |
24 | 259 | |
7/16 | 14 | 376 |
20 | 400 | |
1/2 | 13 | 517 |
20 | 541 |
Stainless Steel 304L Fasteners Spec Chart
Standard | ASTM A193/ ASME SA193 |
Lengths | 3 upto 200 Millimetre |
In Form of: | Threading, Hex, Round, Square as per Gauge Etc. |
---|---|
Sizing | 3/6 inch upto 2 inch | M3 – M56 |
Stainless Steel 304L nuts physical properties
Grades | Density (kg per m3) | Elastic Modulus (GPa) | Thermal Expansion Mean Coefficient (m/ m/ °C) | Thermal Conductivity (W/ m.K) | Specific Heat 0-100°C (J/ kg.K) | Electrical Resistivity
(n.m) |
|||
---|---|---|---|---|---|---|---|---|---|
0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
304L | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
Chemical Structure of Alloy 304L washers
C | Mn | Si | P | S | Cr | Mo | Ni | N |
0.030 max | 2.0 max | 0.75 max | 0.045 | 0.030 | 18.0-20.0 | – | 8.0-12.0 | 0.10 |
SS 304L stud bolts Mechanical Behaviour
Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness Rockwell B (HR B) max | Hardness Brinell (HB) max |
485 | 170 | 40 | 92 | 201 |
Material Equivalent of ASTM A193 grade 304L bolts
AISI Grade | JIS | Stainless Steel Notation | EN/DIN Numerical | UNS designation |
EN/DIN Symbolical |
AISI 304L | SUS304L | SS 304L | EN 1.4307 | UNS S30403 | X2CrNi18-9 |
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