Ananka Group is a Nitronic fasteners manufacturer in India, working from Vasai in the Mumbai region of Maharashtra. We make fasteners in Nitronic 50 (UNS S20910, also called XM-19) and Nitronic 60 (UNS S21800) for service where galling, chloride corrosion or magnetic permeability is a concern, and we supply customers in India and overseas.
Our Nitronic 50 and 60 fasteners include Nitronic bolts, Nitronic nuts (including Nitronic 60 nuts), screws, stud bolts and washers, made to DIN and ISO standards. If your size, length or thread form is not a standard item, we manufacture to your drawing or specification, inch or metric, as part of our custom fasteners work.
Not sure which grade to specify? Nitronic 60 is usually chosen to resist galling, and Nitronic 50 where you need more strength and corrosion resistance than 316 stainless steel fasteners. You can review a sample MTC before you order, or send us your RFQ with grade, size and quantity.
About Nitronic 50 & 60 Fasteners
Nitronic 50 and Nitronic 60 fasteners are made from nitrogen-strengthened austenitic stainless steels. Nitronic 50 (UNS S20910, XM-19) and Nitronic 60 (UNS S21800) are used where standard 304 or 316 fasteners seize, wear or yield too easily.
Nitronic 50 has corrosion resistance greater than 316 and 316L and roughly twice the room-temperature yield strength of 316. It keeps very good mechanical properties at both elevated and sub-zero temperatures and does not become magnetic when cold worked.
Nitronic 60 fasteners are chosen for galling and wear resistance, which suits threaded parts such as Nitronic 60 bolts and screws that are assembled and taken apart repeatedly. Its general corrosion resistance sits between 304 and 316, with better pitting, crevice and stress corrosion resistance than 316, and good oxidation resistance at high temperature. Bolting is covered by ASTM A193 Grade B8S, with nuts to ASTM A194 Grade 8S.
In short, pick Nitronic 60 when galling is the main problem and Nitronic 50 when strength and corrosion resistance above 316 matter most. We make Nitronic bolts, nuts, screws, studs and washers from bar and forging stock, for pumps, valves and fittings in chemical, petrochemical and marine service.
Nitronic Fasteners Exporter
Nitronic Fasteners Supplier
Nitronic Fasteners Manufacturer
Nitronic 50 or Nitronic 60: which grade should you specify?
Specify Nitronic 60 when galling and wear are the problem, and Nitronic 50 when you need strength and corrosion resistance above 316. Both are austenitic stainless steels strengthened with nitrogen, and both are available from us as bolts, nuts, screws, studs and washers.
If your service is mainly general corrosion with no moving or repeatedly assembled threads, a standard 316 stainless steel fastener may be enough. For seawater or chloride service above that, compare with our duplex, super duplex and SMO 254 ranges.
| Nitronic 50 | Nitronic 60 | |
|---|---|---|
| UNS number | S20910 (XM-19) | S21800 |
| Chosen for | Strength and corrosion resistance above 316 | Galling and wear resistance |
| Corrosion resistance | Greater than 316 and 316L | General: between 304 and 316. Pitting, crevice and stress corrosion cracking: better than 316 |
| Strength | About twice the room-temperature yield strength of 316 | 345 MPa minimum 0.2% proof strength (ASTM A276 bar) |
| Wear loss, self-mated, 105 rpm | 9.95 mg per 1,000 cycles | 2.79 mg per 1,000 cycles |
| Magnetic behaviour | Does not become magnetic when cold worked | Relative permeability about 1.003, annealed |
| Bolting and nuts | Covered by ASTM A193 and A194 | ASTM A193 Grade B8S bolting, A194 Grade 8S nuts |
Data: published Nitronic 50 and Nitronic 60 datasheets. Wear figures are from the Nitronic 60 datasheet's self-mated test.
What is the chemical composition of Nitronic 50 and Nitronic 60?
Nitronic 50 is a chromium-nickel-manganese-molybdenum austenitic steel with 0.20–0.40% nitrogen plus niobium and vanadium. Nitronic 60 has lower chromium and nickel, 7–9% manganese and 3.5–4.5% silicon, and its ASTM A276 composition lists no molybdenum.
Both grades are strengthened with nitrogen. The limits below are those published in the Nitronic 50 and Nitronic 60 (ASTM A276) datasheets.
| Element (wt %) | Nitronic 50 (UNS S20910) | Nitronic 60 (UNS S21800) |
|---|---|---|
| Chromium (Cr) | 20.5 – 23.5 | 16.0 – 18.0 |
| Nickel (Ni) | 11.5 – 13.5 | 8.0 – 9.0 |
| Manganese (Mn) | 4.0 – 6.0 | 7.0 – 9.0 |
| Molybdenum (Mo) | 1.5 – 3.0 | Not specified |
| Nitrogen (N) | 0.20 – 0.40 | 0.08 – 0.18 |
| Silicon (Si) | 1.00 max | 3.5 – 4.5 |
| Niobium (Nb) | 0.10 – 0.30 | Not specified |
| Vanadium (V) | 0.10 – 0.30 | Not specified |
| Carbon (C) | 0.06 max | 0.10 max |
| Phosphorus (P) | 0.040 max | 0.060 max |
| Sulphur (S) | 0.030 max | 0.030 max |
| Iron (Fe) | Balance | Balance |
The limits above are for the alloy. The actual analysis of your heat is on the material test certificate. View a sample MTC.
What are the mechanical and physical properties of Nitronic fasteners?
Annealed Nitronic 50 bar typically gives 413 MPa proof strength and 806 MPa tensile strength. Nitronic 60 bar meets a minimum of 345 MPa proof and 655 MPa tensile under ASTM A276, and typically gives 415 MPa and 710 MPa.
Nitronic 50 keeps very good mechanical properties at both elevated and sub-zero temperatures. These are bar-stock values: finished fastener strength depends on the size, the standard and the condition you order, so state the property class or ASTM grade in your enquiry.
| Property | Nitronic 50 | Nitronic 60 |
|---|---|---|
| 0.2% proof strength | 413 MPa (60 ksi), typical | 345 MPa minimum (ASTM A276); 415 MPa typical |
| Tensile strength | 806 MPa (117 ksi), typical | 655 MPa minimum; 710 MPa typical |
| Elongation | 45%, typical | 35% minimum; 64% typical |
| Hardness, annealed | Not stated | 200 HB, typical |
| Density | 7.88 g/cm³ | 7.622 g/cm³ |
| Modulus of elasticity (tension) | 180 GPa | 180 GPa |
| Mean thermal expansion | 16.2 µm/m·K (70–200 °F) | 15.8 µm/m·K (24–93 °C); 17.3 (24–316 °C); 18.0 (24–538 °C) |
| Melting range | 1415 – 1452 °C | Not stated |
| Heat treatment | Not hardenable by heat treatment | Not stated |
Typical values are not guarantees. Sources: Nitronic 50 and Nitronic 60.
Do Nitronic 60 fasteners resist galling?
Yes. In unlubricated threshold galling tests, annealed Nitronic 60 did not gall against 304, 17-4 PH or another Nitronic 60 part at the stresses tested, and began to gall at 262 MPa against 316 and 248 MPa against 430.
Self-mated wear tests point the same way. Nitronic 60 lost 2.79 mg per 1,000 cycles at 105 rpm, against 12.50 mg for 316 and 12.77 mg for 304. That is why Nitronic 60 bolts, Nitronic 60 nuts and Nitronic 60 screws suit joints that are tightened and loosened often.
| Grade (self-mated) | Wear loss at 105 rpm (mg / 1,000 cycles) | Wear loss at 415 rpm (mg / 1,000 cycles) |
|---|---|---|
| Nitronic 60 | 2.79 | 1.58 |
| Nitronic 50 | 9.95 | 4.60 |
| 316 | 12.50 | 7.32 |
| 304 | 12.77 | 7.59 |
Laboratory data from the Nitronic 60 datasheet. Real thread performance depends on lubrication, thread fit, speed and torque. For critical joints, test a sample in your own assembly.
What sizes, standards and styles do we manufacture?
We make Nitronic fasteners from M4 to M80 metric and 1/4" to 8" imperial, in lengths up to 1000 mm, to the DIN and ISO standards below. Non-standard sizes, threads and head forms are made to your drawing under our custom fasteners service.
- Sizes: M4 to M80 metric | 1/4" to 8" imperial
- Threads: ISO metric, UNC / UNF / UNEF / BSW
- Length: up to 1000 mm
- Surface finish and coatings: state your requirement with the RFQ
- Material standards (Nitronic 50): ASTM A193, A194, A240, A276, A479, A580 (XM-19); AMS 5764, AMS 5861
- Material standards (Nitronic 60): ASTM A193 Grade B8S, A194 Grade 8S, A240, A276, A314, A479
| Product | Styles | Standards |
|---|---|---|
| Nitronic screws | 12 point screws, button head cap screws, flat head screws, hex head cap screws, pan head screws, security screws, set screws, socket head cap screws, vented screws | DIN 603 / ISO 8677 · DIN 912 / ISO 4762 · DIN 913 / ISO 4026 · DIN 914 / ISO 4027 · DIN 915 / ISO 4028 · DIN 916 / ISO 4029 · DIN 921 · DIN 931 / ISO 4014 · DIN 933 / ISO 4017 · DIN 961 / ISO 8676 · DIN 965 / ISO 7046 · DIN 966 / ISO 7047 · DIN 7991 · DIN 84 / ISO 1207 · DIN 85 / ISO 1580 · DIN 34822 · DIN 73421 · DIN 7504 / ISO 15480 · DIN 7984 · DIN 963 / ISO 2009 |
| Nitronic bolts | Hex head bolts, shoulder bolts | DIN 931 · DIN 933 · ISO 4014 · ISO 4017 · ISO 7370 |
| Nitronic nuts | Hex nuts, lock nuts | DIN 439 / ISO 4035 · DIN 934 / ISO 4032 · DIN 985 / ISO 7040 · DIN 980 / ISO 7042 · DIN 1587 · DIN 6923 / ISO 4161 |
| Nitronic threaded products | Studs, threaded rods | DIN 975 · DIN 976 |
| Nitronic washers | Flat washers, lock washers | DIN 125 / ISO 7089 / ISO 7090 · DIN 126 / ISO 7091 · DIN 127 · DIN 9021 / ISO 7093 |
Browse the related ranges: bolts, nuts, screws, stud bolts, washers. Dimensions and weights: standards and weight charts.
Where are Nitronic 50 and 60 fasteners used?
Nitronic fasteners are used in pumps, valves and fittings for chemical, petrochemical, oil and gas and marine service. Nitronic 50 is also listed for fertilizer, pulp and paper, textile, food processing and nuclear fuel recycling plant, and Nitronic 60 for valve stems, seats, trim, bushings and aerospace parts.
- 🧪 Chemical industries
- ⛽ Petrochemical industries
- 🛢️ Oil and gas industry
- 🏗️ Building & construction
- 🚢 Marine industry
- 🚀 Defense & aerospace
- 🚗 Automobile industry
What should you send with a Nitronic enquiry?
Send the grade (Nitronic 50 or 60), product type, size, thread, length, quantity and the standard or drawing. With that we can confirm the material route and quote without a second round of questions.
- Material test certificate: see a sample MTC before you order.
- Datasheets: download product datasheets.
- Quality and certification: view our certificates.
Nitronic fasteners: frequently asked questions
What is Nitronic 60 used for in fasteners?
Nitronic 60 is used for bolts, nuts and screws that must resist galling and wear, such as threaded parts in valves and pumps that are assembled and taken apart repeatedly. Its pitting, crevice and stress corrosion resistance is better than 316, and its general corrosion resistance sits between 304 and 316.
Is Nitronic 50 the same as XM-19?
Yes. Nitronic 50 is the trade name for UNS S20910, which ASTM standards such as A240, A276 and A479 list as XM-19.
How does Nitronic 60 compare with 304 and 316 for wear?
In published self-mated wear tests at 105 rpm, Nitronic 60 lost 2.79 mg per 1,000 cycles, against 12.50 mg for 316 and 12.77 mg for 304. Wear loss is not the same as thread galling, so test a sample in your own joint if the application is critical.
Which ASTM grade covers Nitronic 60 bolts and nuts?
ASTM A193 Grade B8S covers Nitronic 60 (UNS S21800) bolting, and ASTM A194 Grade 8S covers the nuts. Tell us the grade, class and standard on your purchase order and we will quote to it.
Are Nitronic fasteners magnetic?
Nitronic 50 does not become magnetic when cold worked. Annealed Nitronic 60 has a relative magnetic permeability of about 1.003.
Can you make Nitronic fasteners to my drawing?
Yes. We manufacture to your drawing or specification in metric or inch sizes. Send the grade, size, thread, length, quantity and standard with your RFQ.
Request a quote for Nitronic fasteners
Tell us the grade, size, quantity and standard. We reply with a quotation for Nitronic 50 or Nitronic 60 bolts, nuts, screws, studs and washers made to your specification.
Or email sales@anankafasteners.com.
Your reliable manufacturing partner for high-quality industrial fasteners and global export.
Quick Links
Contact
- Address: Plot No - 14, Dewan And Shah Udyog Nagar, Golani Naka, Vasai East, Vasai-Virar, Waliv, Maharashtra 401208
- Email:
sales@anankafasteners.com
yogita@anankafasteners.com
globalsales@anankafasteners.com