254 SMO Fasteners

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254 SMO Fasteners
What is 254 SMO Fasteners?

A high-end stainless-steel alloy mainly designed to provide resistance against saltwater is the 250 SMO fasteners. It comprises 6% Molybdenum, which provides good corrosion resistance and gives much higher strength than other stainless steels. It is an ideal solution to environments with high chlorides. It demands heavy usage of chlorine or chloride.

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We have a lot of expertise as an affordable UNS S31254 bolts and nuts manufacturer in India with respect to ASTM A193, compare SMO 254 vs 316

What is the difference between 254 SMO stainless steel vs 316?

In chloride containing environments, SMO 254 fasteners offers good corrosion resistance. It has higher contents of molybdenum, chlorium and nitrogen. It is different than other types of stainless steels due to higher ductility and higher strength. Mostly used in marines, petrochemicals and chemical industries.

SS 316 is on the other hand, known for high-temperature tolerance and good corrosion resistance. This nature is due to combination of metals only, which include, molybdenum, nickel and chlorium. SS 316 is used in food and processing industries, pharmaceuticals and medical devices.

Supplier of DIN 1.4547 studs and threaded rod, choose from our broadest selections of SMO 254 Fasteners stock at the cheapest cost in Mumbai, read about its installation process

254 SMO Bolts

254 SMO Bolts

UNS S31254 hex bolts

UNS S31254 hex bolts

DIN 1.4547 stud bolts

DIN 1.4547 stud bolts

How do you install 254 SMO fasteners correctly?

To install a 254 SMO Fasteners, we have to first have 254 SMO bolts, screws and nuts. Below are some of the steps that ensure safe and convenient ways of installing a fastener.

  • First drill the mounting hole by the means of driller. If they have broken edge in excess of 005’’/.127mm, do not use them.
  • To avoid galling, use thread lubrication. In such situations it becomes quite frustrating. This is an essential step as alloy 254 6 mo screws are susceptible to galling. It helps in reducing friction.
  • Install pilot of the fastener into drilled hole.
  • Apply some force till the head of the alloy 254 SMO socket head cap screw is in contact with the surface.
  • install it from the opposite side of the fastener.
  • clean surface and then apply coating if near coastal areas.

No need to buy the standard size, we supply custom size also in 254 smo stainless steel screws and threaded rod ranging from Metric M1.2 – M48 with various threads

254 smo fasteners specification
254 smo fasteners specification

 

Metric Size Imperial Size Length
M1.2 to M48 Stanadard #00 to 4" upto 1500 mm
Specification Thread Uses
ASTM A193| ASME SA193 BSW, METRIC, UNF, UNC, BSF, Custom

Saltwater application

We are authorised and trusted stockist of 6 Moly hex bolts and socket head cap screw in the Gulf countries at a fantastic price, Get more about its available types
Most popular types of smo 254 fasteners
254 SMO stainless steel nuts

254 SMO stainless steel nuts

  • Size: 3/6 to 2 inch
  • Length: 3 to 200 mm
  • ASTM A193 | ASME SA193
Alloy 254 screws

Alloy 254 screws

  • Desalination
  • Food processing
  • Seawater application
6 Moly threaded rod

6 Moly threaded rod

  • UNJ
  • UNF, Rolled
  • UNC and UNR
We guarantee the shortest delivery of Alloy 254 6 Mo washer accompanied by all necessary paperwork, including the MTC, examine its properties.
254 smo stainless steel nuts chemical properties
254 SMO S
Sulfur
Cu
Copper
C
Carbon
Mn
Manganese
P
Phosphorus
Si
Silicon
Cr Chromium Ni Nickel Mo
Molybdenum
N
Nitrogen
0.015 max 0.50–1.00 0.020 max 1.00 max 0.030 max 0.80 max 19.5–20.5 17.5–18.5 6.0–6.5 0.18–0.22
DIN 1.4547 stud bolts mechanical properties
Elongation (min 2"): 35%
Tensile Strength: 98 ksi min
Hardness (Rockwell B Scale): 96 HRB max
Yield Strength: 45 ksi min
UNS S31254 hex bolts equivalent
STANDARD SIS UNS WERKSTOFF NR. GOST JIS AFNOR EN
SMO 254 2378 S31254 1.4547 Z1 CNDU 20.18.06Az X1CrNiMoCuN20-18-7
What is the difference between 254 SMO vs super duplex?

When it comes to 254 SMO and a super duplex, it has a lot of difference. A 254 SMO is non-magnetic, easier and more convenient to weld and has wide temperature tolerance range.

A SMO 254 is more convenient than a super duplex because it has more nickel and molybdenum content, making it more expensive and has significantly lower strength. Therefore, it is widely used in mode of applications where usage of super duplex is limited.

On the other hand, flue gas desulphurisation systems in power stations make use of super duplex stainless steel, which result in lower temperatures due to its continuous operations.

Are 254 SMO fasteners suitable for cryogenic applications?

UNS S31254 hex bolts are used in atmospheres of high chlorine such as blackwater or seawater. It ensures superior toughness and high strength at cryogenic temperatures. It also exhibits good mechanical properties at both moderate and high-temperature.

They are forged to 982 – 1149 degrees. Post process annealing is done to attain maximum corrosion resistance. They are also resistant to uniform corrosion. The grade of fasteners is significantly stronger than other steel alloys.

What are the different types of 254 SMO fasteners available?

This fastener comprises of various components. Different categories of nuts are available, but 254 SMO stainless steel nuts come with high-level contents of Molybdenum. It is ideal for high temperatures and evenly distributing load. It should be only used when the temperature is below 350-degree Fahrenheit.

A thin plate with a hole at the centre which distributes the load of a threaded fastener is the WNR 1.4547 washers. There are several other types of fasteners which are available such as Bolts, screws, studs, threaded rods and many more.

Alloy 254 6 Mo nut size chart
Diameter*
(mm)
254 SMO Nut Size
(mm)
Height
(mm)
Jam Nut Hex Nut Nylock Nut
5 2.5 1.6 2 -
4 2 1.2 1.6 -
27 18 9 15 18.5
5.5 3 1.8 2.4 4
8 5 2.7 4 5
7 4 2.2 3.2 5
10 6 3.2 5 6
13 8 4 6.5 8
11 7 3.5 5.5 -
17 10 5 8 10
22 14 7 11 14
19 12 6 10 12
24 16 8 13 16
30 20 10 16 20
Size chart of WNR 1.4547 washer
Weight (lbs.) Per 100 Pieces Sizes B A C
Inside Diameter Thickness Outside Diameter
8 5/8 13/4 11/16 0.134
4 1/2 13/8 9/16 0.109
11 3/4 2 13/16 0.148
19 1 21/2 11/16 0.165
15 7/8 21/4 15/16 0.165
26 11/4 3 13/8 0.165
22 11/8 23/4 11/4 0.165
33 13/8 31/4 11/2 0.180
43 15/8 33/4 13/4 0.180
38 11/2 31/2 15/8 0.180
50 13/4 4 17/8 0.180
63 2 41/2 21/8 0.180
57 17/8 41/4 2 0.180
83 21/4 43/4 23/8 0.220
110 23/4 51/4 27/8 0.259
96 21/2 5 25/8 0.238
130 3 51/2 31/8 0.284
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