Duplex Steel Fasteners
Supplies Of Duplex Fasteners, Duplex Hex Bolts, Duplex Steel Fixings, Duplex Bolts, and Duplex Stainless Steel Fasteners Suppliers in Europe.
Duplex Hex Head Fasteners Suppliers In UAE (Dubai), Fasteners, Duplex Studs, Duplex Bolts, Duplex Nuts, Exporters, and Manufacturers in UK.
Kalpataru Piping Solutions is a manufacturer and supplier of Duplex Steel Fasteners in the UK. Our company is dedicated to maintaining high quality standards and consistently meets customer expectations. Duplex Steel Fasteners are notable for their strong yield strength, which is twice that of annealed austenitic stainless steels. These fasteners are made with a high amount of chromium alloy and a moderate amount of nickel. Duplex steels offer better corrosion resistance compared to other stainless steels, particularly against localized corrosion such as crevice and pitting, as well as stress corrosion cracking. Overall, Duplex Steel Fasteners provide significant advantages over other types of fasteners.Properties of Duplex Steel Fasteners
Duplex Steel Fasteners are known for their toughness, hardness, and high tensile strength, thanks to the chromium in their composition. These fasteners are resistant to deformation and damage, making them highly reliable. The unique structure of Duplex Steel Fasteners combines ferritic and austenitic stainless steel, resulting in exceptional mechanical properties. The austenite component provides increased strength, while the fine ferrite structure ensures excellent toughness. These fasteners are widely used in various industries due to their superior mechanical properties. They offer the advantage of reduced weight without compromising on quality or performance, making them more cost-effective by lowering the overall weight of the finished product. Duplex Steel Fasteners outperform the entire 300-series stainless steel fasteners, making them a preferred choice for many applications.Types of Duplex Steel Fasteners
Specification of Duplex Steel Fasteners
Specifications :Â ASTM F593, F594, F1554 / ASME SF593, F594, F1554
Fasteners size : Bolt / Screw Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Nuts Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Washers Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Machine Screws Size : M1.6 – M12
Self Tapping Screw Size : No.2 – No. 14
Fasteners Length :Â 3 mm to 200 mm
Fastener Threads :Â UNF, BSW, BSF, METRIC, UNC or as required
Surface Coating :Â Ptfe Coated Duplex Steel Fasteners Phosphate Coating Teflon Coating Zinc Coating Hot Dipped Galvanizing Coating Cadmium Coating Xylon Coating
Duplex Fasteners Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| Duplex S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| Duplex S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 – 23.0 | 2.50 – 3.50 | 4.50 – 6.50 | 0.8 – 0.20 | 63.54 min |
| Duplex S32750 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00 – 26.00 | 3.00 – 5.00 | 6.00 – 8.00 | 0.24 – 0.32 | 58.095 min |
| Duplex S32760 | 0.05 max | 1.00 max | 1.00 max | 0.030 max | 0.010 max | 24.00 – 26.00 | 3.00 – 4.00 | 6.00 – 8.00 | 0.20 – 0.30 | 57.61 min |
Size Chart for Duplex Steel Fasteners
|
Fasteners Type
|
SIZE
|
GRADE
|
ASME
|
ISO
|
ASTM
|
|---|---|---|---|---|---|
|
Socket Head Cap Fasteners
|
M1.6 to M64
|
12.9
|
B18.3.1 M
|
4762
|
A574M
|
|
Socket Low Head Cap Fasteners
|
M4 to M20
|
10.9
|
|||
|
Socket Head Shoulder Fasteners
|
M6 to M24
|
012.9
|
B18.3.3M
|
||
|
Countersunk Socket Head Fasteners
|
M3 to M20
|
012.9
|
B18.3.5M
|
10642
|
F835M
|
|
Button Head Socket Fasteners
|
M3 to M12
|
012.9
|
B18.3.4M
|
7380
|
F835M
|
|
Flange Button Head Socket Fasteners
|
M3 to M10
|
012.9
|
F835M
|
||
|
Knurled Point Socket Set Fasteners
|
M3 to M20
|
45H
|
B18.3.6M
|
4029
|
F912M
|
|
Flat Point Socket Set Fasteners
|
M6 to M12
|
45H
|
B18.3.6M
|
4026
|
F912M
|
|
Dog Point Socket Set Fasteners
|
M3 to M20
|
45H
|
B18.3.6M
|
4028
|
F912M
|
|
Cone Point Socket Set Fasteners
|
M3 to M12
|
45H
|
B18.3.6M
|
4027
|
F912M
|
|
Plain Point Socket Set Fasteners
|
M3 to M20
|
45H
|
B18.3.6M
|
4029
|
F912M
|
|
Taper Pressure Plug
|
M8 to M22
|
–
|
|
Duplex Fasteners Type
|
SIZE
|
PROPERTY CLASS
|
TENSILE STRENGTH
|
STANDARD
|
|---|---|---|---|---|
|
Duplex Hex Head Fasteners
|
M4 to M80
|
10.9
|
1040N / mm2 min
|
ISO 4017 (Full Thread)
ISO 4014 (Half Thread) |
|
Duplex Nuts Type
|
SIZE
|
PROPERTY CLASS
|
STANDARD
|
|---|---|---|---|
|
Duplex Hex Nut
|
M6 to M42
|
10
|
ISO 4032
|
|
Duplex Nylock Nut
|
M6 to M20 (Gr.8)
M10 to M24 (Gr.10) |
8 & `10
|
DIN 982
|
|
Duplex Nylock Nut
|
M6 to M20 (Gr.8)
M10 to M24 (Gr.10) |
8 & 10
|
DIN 985
|
|
Duplex Hex Weld Nut
|
M6 to M12
|
8
|
DIN 929
|
|
Duplex Washers Type
|
SIZE
|
HARDNESS
|
STANDARD
|
|---|---|---|---|
|
Square Section Spring Washer, Duplex
|
3mm to 39mm
|
HV (430 to 530)
|
DIN 7980
|
|
Flat Section Spring Washer, Duplex
|
3mm to 39mm
|
HV (430 to 530)
|
DIN 127 B
|
|
Hardened Washer, Duplex
|
12mm to 30mm
|
HV (300 to 370)
|
IS 2016
|
|
Hardened Steel Washer, Duplex
|
12mm to 56mm
|
Rockwell 26 to 45 (HDG)
Rockwell 38 to 45 (Coated) |
ASTM F436M
|
Dimensions Chart for Duplex Steel Fasteners
|
Bolt Size
|
USS
|
SAE
|
||||
|
OD (in.)
|
ID (in.)
|
Thickness
|
OD (in.)
|
ID (in.)
|
Thickness
|
|
|
1/8 (#6)
|
–
|
–
|
–
|
0.375
|
0.156
|
.036/.065
|
|
5/32 (#8)
|
–
|
–
|
–
|
0.438
|
0.188
|
.036/.065
|
|
3/16 (#10)
|
0.560
|
0.250
|
.036/.065
|
0.500
|
0.220
|
.036/.065
|
|
7/32 (#12)
|
–
|
–
|
–
|
0.562
|
0.250
|
.051/.080
|
|
1/4 (#14)
|
0.734
|
0.312
|
.051/.080
|
0.625
|
0.281
|
.051/.080
|
|
5/16
|
0.875
|
0.375
|
.064/.104
|
0.688
|
0.344
|
.051/.080
|
|
3/8
|
1.000
|
0.438
|
.064/.104
|
0.812
|
0.406
|
.051/.080
|
|
7/16
|
1.250
|
0.500
|
.064/.104
|
0.922
|
0.469
|
.051/.080
|
|
1/2
|
1.375
|
0.562
|
.086/.132
|
1.062
|
0.531
|
.074/.121
|
|
9/16
|
1.469
|
0.625
|
.086/.132
|
1.156
|
0.594
|
.074/.121
|
|
5/8
|
1.750
|
0.688
|
.108/.160
|
1.312
|
0.656
|
.074/.121
|
|
3/4
|
2.000
|
0.812
|
.122/.177
|
1.469
|
0.812
|
.108/.160
|
|
7/8
|
2.250
|
0.938
|
.136/.192
|
1.750
|
0.938
|
.108/.160
|
|
1
|
2.500
|
1.062
|
.136/.192
|
2.000
|
1.062
|
.108/.160
|
|
1 1/8
|
2.750
|
1.250
|
.136/.192
|
2.250
|
1.250
|
.108/.160
|
|
1 1/4
|
3.000
|
1.375
|
.136/.192
|
2.500
|
1.375
|
.136/.192
|
|
1 3/8
|
3.250
|
1.500
|
.153/.213
|
2.750
|
1.500
|
.136/.213
|
|
1 1/2
|
3.500
|
1.625
|
.153/.213
|
3.000
|
1.625
|
.153/.213
|
|
1 5/8
|
3.750
|
1.750
|
.153/.213
|
–
|
–
|
–
|
|
1 3/4
|
4.000
|
1.875
|
.153/.213
|
–
|
–
|
–
|
|
1 7/8
|
4.250
|
2.000
|
.153/.213
|
–
|
–
|
–
|
|
2
|
4.500
|
2.125
|
.153/.213
|
–
|
–
|
–
|
|
2 1/4
|
4.750
|
2.375
|
.320/.248
|
–
|
–
|
–
|
|
2 1/2
|
5.000
|
2.625
|
.210/.280
|
–
|
–
|
–
|
|
2 3/4
|
5.250
|
2.875
|
.228/.410S
|
–
|
–
|
–
|
|
3
|
5.500
|
3.125
|
.249/.327
|
–
|
–
|
–
|
We Export To Duplex Steel Fasteners
New Zealand, Ukraine, Brazil, Azerbaijan, Angola, United Kingdom, Philippines, Oman, France, Algeria, Macau, Sri Lanka, Tibet, Norway, Mexico, Venezuela, Denmark, Russia, Bhutan, Estonia, Austria, Vietnam, Argentina, Turkey, Greece, Romania, Bahrain, Bangladesh, Afghanistan, Italy, Poland, Zimbabwe, Thailand, India, Kenya, Ecuador, Puerto Rico, Nepal, Malaysia, Bulgaria, Libya, Slovakia, Chile, Serbia, Australia, Poland, Iran, Costa Rica, Peru, South Korea, Iraq, Iran, Indonesia, Spain, Trinidad & Tobago,Tunisia, Qatar, Japan, Canada, Taiwan, Yemen, Mongolia, Czech Republic, Israel, Ghana, Egypt, Nigeria, Saudi Arabia, United Arab Emirates, Namibia, Hungary, South Africa, Hong Kong, Croatia, Colombia, Lebanon, Nigeria, Portugal, Finland, Pakistan, Jordan, Sweden, Belgium, Gambia, Lithuania, United States, Chile, Bolivia, Germany, Singapore, Ireland, Gabon, Kuwait, Switzerland, Mexico, Belarus, Kazakhstan, Morocco, China, Netherlands, Germany, Belgium, Italy, Turkey, Denmark and UK.
FAQ
What are duplex fasteners?
Duplex stainless steel fasteners are used in critical applications requiring excellent corrosion resistance and high strength. They maintain high strength even in annealed conditions, making them challenging to cold form but ideal for demanding environments.
What is fastener size?
Fastener size includes diameter, thread count, and length. Diameter is the fastener’s width; thread count is the number of threads per inch or pitch; and length is measured from the bottom of the head.
What is a Grade 5 fastener?
Grade 5 fasteners are medium carbon steel components heat-treated for higher strength. Stronger than Grade 2 but weaker than Grade 8, they are commonly used in automotive and construction applications requiring increased strength.
Related Products
- Duplex Steel UNS S31803 Plates and Duplex Steel UNS S31803 Sheets
- Duplex Steel UNS S32205 Plates and Duplex Steel UNS S32205 Sheets
- Duplex Steel UNS S31803 Buttweld Fittings
- Duplex Steel UNS S32205 Buttweld Fittings
- Duplex Steel UNS S31803 Forged Fittings
- Duplex Steel UNS S32205 Forged Fittings
- Duplex Steel UNS S32205 Instrumentation Valve