Detailed explanation of ASTM B166 Alloy 600 pipe fitting

Detailed explanation of ASTM B166 Alloy 600 fasteners
ASTM B166 Alloy 600 (UNS N06600, Inconel 600) fasteners are high-performance nickel-chromium alloy fasteners designed for extreme temperatures (from cryogenic to 2000°F) and corrosive environments, offering exceptional strength, oxidation resistance, and resistance to chloride stress corrosion cracking. Due to their robust mechanical properties and superior corrosion resistance, they are ideal for chemical processing, furnace components, and aerospace applications.
Can Inconel 600 alloy be welded?
Inconel 600 alloy can be welded using various methods, such as tungsten inert gas welding (GTAW) or TIG welding. Other methods include gas metal arc welding (GMAW), MIG welding, and plasma arc welding (PAW).

Specification Format Of inconel 600 fasteners
| ASTM / ANSI | ASTM B166 / ASME SB166 |
|---|---|
| Material | Inconel 600 Alloy Fasteners |
| Standard: |
JIS, ASTM,BS, GB, DIN, IS, ISO ASME B18.5 ANSI B 28.2.4 1M Stud Bolt length are defined in ASME B16.5 standard ANSI B 18.2.4 2M Hex nuts are defined in ASME B18.2.2 DIN: DIN 931, DIN 970, 934 DIN DIN 933 UTS – Unified Thread Standard : NPTF, UNS, NPT, UNF, UNC, UNEF ISO – International Organization for Standardization : ISO 4033 ,ISO 4032, JIS standards |
| Finishing : | Zinc (yellow, white, blue, black), black oxide, Dacroment, Geometry, nickel plated, anodizing, plated zinc-nickel, Stainless steel: Passivated Bright Zinc Plated (BZP), Self-Colour, Hot Dip Galvanised (HDG), Stainless Steel, Sherardized,Mechanically Applied coating and some special one like DACROMET |
| Length | 3 mm to 200 mm |
| Size | M02 to M160 |
| Threads: | BSW, UNC, BSF, UNF METRIC, or as required |
| M3, M14, M2.5, M2, M12, M5, M6, M4, M20, M16, M30, M24, M36, M8, M10 etc. | |
| Nut Types | Inconel 600 Hex Head Nut, Lock Nut Coupling Nut, Square Nut, Wing Nut, Panel Nut, Acorn Nuts, T Nut, Dome Nut, Eye Nutetc. |
| Bolts Types | Inconel 600 Square Bolt, Hex Bolt, Counter sunk Bolt, T Bolt, Hex Head Bolt, Eye Bolt,U Bolt, Lag Bolt etc. |
| Screw Types | Inconel 600 Threaded Screw, Socket Head Screw, Blind Rivet, Socket Set Screw, Shoulder Screw,Concrete Screw, Anchor Screw, Machine Screw, Panel Screw, Hex Head Screw etc. |
| Studs Types | Inconel 600Tie Rods, Threaded Tod, Tie Bars, Double Ended Studs etc. |
| Washer Types | Inconel 600 Lock Washer, Machine Washers, Star Washers, Sealing Washer, Split Washer etc. |
Chemical Analysis Of Inconel 600 Fasteners
|
Element |
Content (%) |
|
Nickel, Ni |
72.0 min |
|
Silicon, Si |
.50 max |
|
Carbon, C |
.15 max |
|
Sulphur, S |
.015 max |
|
Copper, Cu |
.50 max |
|
Iron, Fe |
6.0-10.0 |
|
Manganese, Mn |
1.00 max |
Yield Strength Of Inconel 600 Bolts
|
Density |
8.47 g/cm3 |
|
Melting Point |
1413 °C (2580 °F) |
|
Tensile Strength |
Psi – 95,000 , MPa – 655 |
|
Yield Strength (0.2%Offset) |
Psi – 45,000 , MPa – 310 |
|
Elongation |
40 % |
Inconel 600 Screws Equivalent Grade
|
Alloy |
Common Name |
Related Specification |
|||
|---|---|---|---|---|---|
|
British |
European |
ASTM |
UNS |
||
|
Alloy 600 |
Inconel 600® |
BS 3076 NA 14 |
2.4816 |
B166 |
N06600 |
Head styles of Inconel 600 bolts

Alloy 600 Nut Weight Chart
| Size | Finished Hex | Heavy Hex | Finished Jam | Heavy Hex Jam | Square | Heavy Square |
| 1/2″ Nut | 3.75 | 6.54 | 2.62 | 4.00 | 5.78 | 7.87 |
| 5/8″ Nut | 7.33 | 11.9 | 4.93 | 6.96 | 10.8 | 14.3 |
| 3/4″ Nut | 11.9 | 19.3 | 7.70 | 11.0 | 15.4 | 23.5 |
| 7/8″ Nut | 19.0 | 29.7 | 12.0 | 16.7 | 24.5 | 36.2 |
| 1″ Nut | 28.3 | 42.5 | 17.6 | 23.5 | 36.3 | 51.5 |
| 11/8″ Nut | 40.3 | 59.2 | 24.7 | 32.4 | 52.5 | 72.4 |
| 11/4″ Nut | 54.3 | 78.6 | 36.1 | 45.8 | 70.6 | 95.5 |
| 13/8″ Nut | 73.0 | 102 | 47.9 | 59.3 | 94.5 | 125.0 |
| 11/2″ Nut | 94.3 | 131 | 60.9 | 74.8 | 122 | 161 |
| 15/8″ Nut | 162 | 91.6 | ||||
| 13/4″ Nut | 151 | 204 | 100 | 114 | ||
| 17/8″ Nut | 241 | 134 | ||||
| 2″ Nut | 224 | 299 | 140 | 165 | ||
| 21/4″ Nut | 419 | 227 | ||||
| 21/2″ Nut | 564 | 332 | ||||
| 23/4″ Nut | 738 | 429 | ||||
| 3″ Nut | 950 | 545 | ||||
| 31/4″ Nut | 1194 | 651 | ||||
| 31/2″ Nut | 1526 | 851 | ||||
| 33/4″ Nut | 1812 | 1005 | ||||
| 4″ Nut | 2180 | 1200 |
Torque Chart of Inconel 600 Stud Bolt
|
Flange |
B16.5 Class 150 RF/ Ring Gaskets |
B16.5 Class 150 FF/ Full Face Gaskets |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Torque / Round (ft-lbs) |
Stud Bolts Tighten Sequence |
Torque / Round (ft-lbs) |
Stud Bolts Tighten Sequence |
|||||||
|
1st |
2nd |
Final |
Dwg/No. |
Bolt Size |
1st |
2nd |
Final |
Dwg*/No. |
Bolt Size |
|
|
1/2″ |
10 |
20 |
30 |
4-bolt |
1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
|
3/4″ |
13 |
27 |
40 |
4-bolt |
1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
|
1″ |
15 |
30 |
50 |
4-bolt |
1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
|
1-1/4″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
|
1-1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
|
2″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
|
2-1/2″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
|
3″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
|
3-1/2″ |
40 |
80 |
120 |
8-bolt |
5/8″ |
40 |
80 |
120 |
8-bolt |
5/8″ |
|
4″ |
40 |
80 |
120 |
8-bolt |
5/8″ |
40 |
80 |
120 |
8-bolt |
5/8″ |
|
5″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
|
6″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
|
8″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
|
10″ |
95 |
190 |
320 |
12-bolt |
7/8″ |
95 |
190 |
320 |
12-bolt |
7/8″ |
|
12″ |
95 |
190 |
320 |
12-bolt |
7/8″ |
95 |
190 |
320 |
12-bolt |
7/8″ |
|
14″ |
147 |
294 |
490 |
12-bolt |
1″ |
147 |
294 |
490 |
12-bolt |
1″ |
|
16″ |
147 |
294 |
490 |
16-bolt |
1″ |
147 |
294 |
490 |
16-bolt |
1″ |
|
18″ |
213 |
426 |
710 |
16-bolt |
1-1/8″ |
213 |
426 |
710 |
16-bolt |
1-1/8″ |
|
20″ |
213 |
426 |
710 |
20-bolt |
1-1/8″ |
213 |
426 |
710 |
20-bolt |
1-1/8″ |
|
24″ |
300 |
600 |
1,000 |
20-bolt |
1-1/4″ |
300 |
600 |
1,000 |
20-bolt |
1-1/4″ |
Available Stock Of Inconel 600 Fasteners
|
ASTM B166 Inconel 600 Industrial Fastener Inconel WERKSTOFF NR. 2.4816 Screws Inconel 600 Fasteners Inconel 600 Socket Head Cap Screw Inconel 600 Flat Washers ASTM B166 Inconel 600 Bolts S Inconel 600 Set Screw Inconel 600 Machine Bolt Inconel 600 Machine Screws Inconel 600 Threaded rod ASTM B166 Inconel 600 Fastener Inconel UNS N06600 Hex Coupling Nuts Inconel 600 Studs Inconel 600 Heavy Hex Nuts /Hex Nuts ASTM B166 Inconel 600 Fastener Inconel 600 Bolts |
Inconel Alloy 600 Coupling Nuts Inconel Alloy 600 Structural Bolts Inconel Alloy 600 U Bolts Inconel WERKSTOFF NR. 2.4816 Panel Nut Inconel Alloy 600 Studs Inconel Alloy 600 Heavy Hex Nuts Inconel UNS N06600 Set Screw Inconel Alloy 600 Washer Inconel Alloy 600 Fasteners Inconel Alloy 600 Screws Inconel Alloy 600 Spring Washers Inconel Alloy 600 Hex Domed Cap Nuts Inconel Alloy 600 Structural Bolts Inconel Alloy 600 Marine Anchors Inconel Alloy 600 Machine Bolt Inconel Alloy 600 Machine Screws |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
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📦 Packaging and Shipping
All stainless steel products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel also supplies custom Inconel 600 products in various sizes and specifications. Please send us your drawings for a quote!





