Known as the most versatile and the Stainless Steel 304 Fasteners is most widely used of all conventional stainless steel grades. The amalgamation of its chemical composition along with mechanical properties, good weldability as well as good corrosion resistance is what attracts our clients to stainless steel grade 304. This austenitic SS 304 threaded rod offers the best all-round performance as compared to alloy steel as well as carbon steel, that too at relatively low cost. Moreover, the Stainless Steel 304 nuts are resistant to oxidation corrosion.

Stainless Steel 304 Fasteners

Stainless Steel 304 Fasteners

Grade 304 also has excellent low temperature properties and can be used in applications involving cryogenic temperatures. Since stainless steel 304 is an austenitic alloy that responds well to hardening when the fasteners have been cold worked, the metal not only becomes much stronger, but the surface of the fasteners can be smoothened as well. In most environments and applications, the UNS S30400 bolts produced from this alloy tends to exhibit superior properties to that of ferritic stainless steels grades.


Essentially a non-magnetic stainless steel grade however, the SS 304 studs becomes slightly magnetic when cold worked. Since the alloy has a low carbon content, it would imply a reduced occurrence of carbide precipitation in the heat-affected area during welding operations. Therefore the SS 304 hex bolt has reduced susceptibility to intergranular corrosion. Although the alloy can be welded using traditional procedures, stainless steel grade 304 must compulsorily be annealed in order to restore the corrosion resistance properties that are lost by sensitization. Generally, sensitization to intergranular corrosion occurs in instances where chromium carbides precipitate in the grain boundaries of the welded heat-affected area.

SS 304 hex bolt Mechanical Characteristics

Grades Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
Rockwell B (HR B) max Brine-ll (HB) max
SS 304L 485 170 40 92 201
SS 304/ H 515 205 40 92 201

Composition Standard of UNS S30400 bolts

Grades C Mn Si P S Cr Mo Ni N
Stainless Steel 304L min. max. - 0.030 - 2.0 - 0.75 - 0.045 - 0.030 18.0 20.0 - 8.0 12.0 - 0.10
Stainless Steel 304 min. max. - 0.08 - 2.0 - 0.75 - 0.045 - 0.030 18.0 20.0 - 8.0 10.5 - 0.10
Stainless Steel 304H min. max. 0.04 0.10 - 2.0 - 0.75 - 0.045 - 0.030 18.0 20.0 - 8.0 10.5 -

SS 304 threaded rod Standard Sizes

SS threaded rod Size Threads per Inch
Frac. [No.] Decimal UNC UNF
1/8 [#6] 0.1380 32 40
5/32 [#8] 0.1640 32 36
3/16 [#10] 0.1900 24 32
1/4 0.2500 20 28
5/16 0.3125 18 24
3/8 0.3750 16 24
7/16 0.4375 14 20
1/2 0.5000 13 20
9/16 0.5625 12 18
5/8 0.6250 11 18
3/4 0.7500 10 16
7/8 0.8750 9 14
1 1.0000 8 12, 14
1 1/8 1.1250 7 12
1 1/4 1.2500 7 12
1 3/8 1.3750 6 12
1 1/2 1.5000 6 12
1 3/4 1.7500 5

Stainless Steel 304 nuts Material Equivalent

AISI Grades JIS Stainless Steel Notation EN/ DIN Numerical UNS
designation
EN/DIN Symbolical
AISI 304 SUS304 SS 304 EN 1.4301 UNS S30400 X4CrNi18-10
AISI 304L SUS304L SS 304L EN 1.4307 UNS S30403 X2CrNi18-9
AISI 304H SUS304H SS 304H EN 1.4948 UNS S30409 X2CrNiN18-10

Physical Properties of 304 stainless screws

Grades Elastic Modulus (GPa) Density (kg/m3) Thermal Expansion Mean Coefficient (m/ m/ °C) Thermal Conductivity (W/m.K) Electrical Resistivity(n.m) Specific Heat 0-100°C (J/kg.K)
0-315°C 0-100°C 0-538°C at 500°C at 100°C
Stainless Steel 304/L/H 193 8000 17.8 17.2 18.4 21.5 16.2 720 500

Specification of Stainless Steel 304 Fasteners

Standard ASTM A193/ ASME SA193
Sizing 3/6 inch upto 2 inch | M3 – M56
In Form of: Round, Threading, Hex, Square as per Gauge Etc.
Lengths 3 upto 200 Millimetre