We at Roll-fast manufacture stainless steel bolts & nuts in bigger diameters from M-20 to M-72, we manufacture stainless steel bolts & nuts in DIN 931, DIN 933 and DIN 934 which are one of the most popular dimensional standards
in which we make these popular bolts & nuts.
The biggest market for our supply for these stainless steel bolts & nuts is in Middle east and Europe.
Completely and infinitely recyclable, stainless steel is the “green material” par excellence. In fact, within the construction sector, its actual recovery rate is close to 100%. Stainless steel is also environmentally neutral
and inert, and its longevity ensures it meets the needs of sustainable construction. Furthermore, it does not leach compounds that could modify its composition when in contact with elements like water.
Stainless steel fasteners are particularly popular in the automotive industry, Aerospace industry which involves stainless steel screws in the construction of structural automotive & Aerospace components.
We are the biggest producers for stainless steel bolts and nuts in India, as our name suggests we are manufacturing big bolts and nuts in stainless steel grades in the under mentioned table.
|
Fastener Type
|
Diameter
|
Grades
|
Grades
|
Grades
|
Grades
|
|
Hexagon bolts
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Hex bolts
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Hex cap screws
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Socket head cap screws
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Hex nuts
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Hex lock nuts
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Hex nylock nuts
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Hex castle nuts
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Heavy hex nuts
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Washers
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Stud bolts
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Precision turned components
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
|
Customized Items
|
M-20 to M-72
|
304 / 304 L
|
316 / 316 L
|
310 / 310 S
|
410 / 431
|
Stainless Steel Hex Bar is used in applications that require additional strength. The additional strength comes from the geometry of the hex bars. Stainless steels are in different types such as ferritic, austenitic, martensitic
and duplex. The austenitic stainless steels are preferred for their strength and corrosion resistance properties. Roll-fast have different type & size of raw material with different grade. There are different grades of
stainless steel with different specifications. These grades are mostly dependent on the chemical compositions.
Hex rods are long, hexagon shaped and generally made from stainless steel. Common grades of stainless steel used to manufacture these SS hex rod include grades like 303, 304/L, 316/L, 410, 416, and 440C stainless steels. Typically,
the size range of these bars from 3/16″ through 4″ in.
Comparison chart for international steel grades for stainless steel bolting’s
|
Grades
|
European Number
|
ASTM grade
|
UNS
|
British standard
|
DIN
|
|
304
|
1.4301
|
ASTM A 193 Gr B8
|
S 30400
|
BS 970
|
X 5CrNi1810
|
|
304 L
|
1.4306
|
ASTM A 320 Ge B8
|
S 30403
|
BS 970
|
X 2CrNi1911
|
|
316
|
1.4401
|
ASTM A 193 Gr B8M
|
S 31600
|
BS 970
|
X 5 CrNiMo 17 13 2
|
|
316 L
|
1.4404
|
ASTM A 320 Ge B8M
|
S 31603
|
BS 970
|
X 2 CrNiMo 17 13 2
|
|
310
|
1.4841
|
ASTM A 479
|
S 31000
|
BS 970
|
X 12 CrNi 25 21
|
|
310 S
|
1.4845
|
-
|
S 31008
|
BS 970
|
X 12 CrNi 25 21
|
|
410
|
1.4006
|
-
|
S 41000
|
BS 970
|
X 10Cr13
|
|
431
|
1.4057
|
-
|
S 43100
|
BS 970
|
X 20CrNi172
|
|
316S31
|
1.4401
|
ASTM A 193 Gr B8M
|
S 31600
|
BS 970
|
X 5 CrNiMo 17 12 2
|
Stainless steel can be broken down into three different types: Austenitic, Martensitic and Ferritic.
- Austenitic Stainless Steel
((Between 15%-20% Chromium, Between 5%-19% Nickel) - Austenitic stainless has the highest degree of corrosion resistance of the three types. This type of stainless includes these grades:
302, 303, 304, 304L, 316, 32, 347 and 348. They also have a tensile strength of between 80,000 - 150,000 PSI.
- Martensitic Stainless Steel
(Between 12%-18% Chromium) - Martensitic stainless steel is considered a magnetic steel. It can be heat treated to increase its hardness and is not recommended for welding. This type of
stainless includes: 410, 416, 420 and 431. They have a tensile strength of between 180,000 and 250,000 PSI.
- Ferritic Stainless Steel
(Between 15%-18% Chromium) - Ferritic stainless steel has a tensile strength of 65,000 - 87,000 PSI. While it is still corrosion resistant, it is not recommended for areas where corrosion
is likely to occur. This material cannot be heat treated. Due to the forming process it is magnetic and not suitable for welding. Ferritic grades of stainless include: 430 and 430F.
Below are some of the many bolt grades of stainless steel that we carry.
- 18-8 Stainless Steel:
(18% Chrome, 8% Nickel, .08% Maximum Carbon) - 18-8 Stainless refers to 300 series stainless steel. 303 and 304 Stainless are the most commonly listed grades, the standard grade for stainless
fasteners. They are corrosion-resistant and durable. They are often used in marine applications in freshwater environments but will not work as effectively in a salt-water environment as 316 stainless. Stainless alloy resists
oxidizing and rusting, however it can tarnish over time. Equivalent to metric A2 Stainless Steel.
- 304 Stainless Steel:
(17%-19% Chrome, 8%-10% Nickel, 0.08% Maximum Carbon) - This grade has been developed specifically to improve the cold heading qualities of 18-8. Corrosion resistance and physical qualities are
equal to Type 304. This stainless steel is most commonly used to make deck screws, which are used to fasten wood or composite boards to the main beams of a deck.
- 316 Stainless Steel:
(16%-18% Chrome, 10%-14% Nickel, .08% Maximum Carbon, 2.00% Maximum Molybdenum) - This grade of steel is used and recommended for applications in severe, harsh or marine environments. Its corrosion
resistance is greater than 18-8 stainless, which is why we recommend using 316 stainless steel fasteners for salt-water application. It is important to remember that even the salt in the air near a body of salt-water can
do damage to dry applications, so 316 is the material of choice. Common applications of 316 stainless fasteners include use on boats, docks, piers, and pools.
- 410 Stainless Steel:
(11.5%-13.5% Chrome, .15% Maximum Carbon) - Since this grade of stainless steel can be hardened up to approximately 40 Rockwell C, it is durable in most environments. Harder than 18-8 stainless
but with less corrosion resistance, 410 stainless is commonly used to make roofing screws, siding screws and self-tapping (or self-drilling) screws, because it is a harder material than the metal being fastened in these
types of applications.
Consumption of Stainless Steel
Over the past few years we have manufactured many different kind of stainless steel grades of bolts and nuts, however the the above grades mentioned in the table are the main grades which we are manufacturing consistently. With constant improvement in quality we have been able to excel in the manufacturing process for the above steels and their respective grades.
Roll-Fastt is the biggest and the largest producer for stainless steel ( SS ) hex bolts, hex screws, hex nuts, washers in India, we have 3 factories with a total covered area of over 100,00 sq. feet. We produce all types of SS
products which are used in marine, sewage, water and desalination plants in counties like, Oman, U.A.E., Qatar, Dubai, Bahrain, Saudi Arabia. Our popular Stainless-steel bolts and nuts, SS 304 bolts and nuts, 304 fasteners,
304 Nuts and bolts, 304 bolt nut, 304 nut bolt, 316 Bolts and nuts, 316 fasteners, 316 hex bolts, 316S31 bolts and nuts, stainless fasteners.
