Hastelloy C276 bolts are high-performance fastening components manufactured from a nickel-molybdenum-chromium alloy designed to perform in the most chemically aggressive and high-temperature environments. These bolts are widely used in chemical processing plants, marine engineering systems, pollution control equipment, and power generation units where conventional stainless steel fasteners fail due to pitting, crevice corrosion, or stress corrosion cracking.

Engineered under ASTM B574 and related international standards, Hastelloy C276 bolts deliver exceptional resistance against oxidizing and reducing media, including chlorides, acids, and seawater exposure. Their mechanical stability under fluctuating thermal conditions makes them a preferred choice for mission-critical assemblies.
KK Fasteners supplies Hastelloy C276 Bolts to global industrial clients with full traceability, precision machining, and compliance with international fastener standards, ensuring consistent performance in high-risk operational environments.
| Material | Hastelloy C276 (UNS N10276), Nickel-Molybdenum-Chromium Alloy |
| Standards | ASTM B574, DIN 933, DIN 931, ISO 4014, ISO 4017 |
| Product Types | Hex Head Bolts, Stud Bolts, Socket Head Cap Screws, Threaded Rods |
| Size Range | M3 to M64 | 1/8” to 2.5” |
| Thread Type | Metric (M), UNC, UNF, BSW |
| Tensile Strength | Minimum 690 MPa |
| Yield Strength | Minimum 283 MPa |
| Hardness | 100 – 200 HRB (approx.) |
| Surface Finish | Bright, Pickled, Polished |
| Coating Options | PTFE Coating, Anti-galling Treatment (on request) |
| Temperature Resistance | Up to approx. 538°C (1000°F) |
| Hastelloy C276 | Ni | C | Mo | Mn | Si | Fe | P | S | Co | Cr |
| Balance | 0.01 max | 15 – 17 | 1.0 max | 0.08 max | 4 – 7 | 0.04 max | 0.03 max | 2.5 max | 14.5 – 16.5 |
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.89 g/cm3 | 1370 °C (2500 °F) | Psi – 52,000 , MPa – 355 | Psi – 1,15,000 , MPa – 790 | 40 % |
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | OR | GOST |
| Hastelloy C276 | N10276 | 2.4819 | – | NiMo16Cr15W | NW 0276 | ЭП760 | ХН65МВУ |
All measurements in millimeters
NOMINAL SIZE (D) |
BODY DIAMETER |
BOLT HEAD THICKNESS |
ACROSS THE FLATS |
ACROSS CORNERS |
||||
|---|---|---|---|---|---|---|---|---|
D (MAX) |
D (MIN) |
H (MAX) |
H (MIN) |
F (MAX) |
F (MIN) |
C (MAX) |
C (MIN) |
|
m10 |
10.00 |
9.78 |
6.63 |
6.17 |
17.00 |
15.73 |
18.48 |
17.77 |
m12 |
12.00 |
11.73 |
7.76 |
4.24 |
19.00 |
17.73 |
20.78 |
20.03 |
m14 |
14.00 |
13.73 |
9.09 |
8.51 |
22.00 |
20.67 |
24.25 |
23.35 |
m16 |
16.00 |
15.73 |
10.32 |
9.68 |
24.00 |
23.67 |
27.71 |
26.75 |
m20 |
20.00 |
19.67 |
12.88 |
12.12 |
30.00 |
29.16 |
34.64 |
32.95 |
m24 |
24.00 |
23.67 |
15.44 |
14.56 |
36.00 |
35.00 |
41.57 |
39.55 |
m30 |
30.00 |
29.67 |
19.48 |
17.92 |
46.00 |
45.00 |
53.12 |
50.85 |
m36 |
36.00 |
35.61 |
23.38 |
21.63 |
55.00 |
53.80 |
63.51 |
60.79 |
m42 |
42.00 |
41.38 |
26.97 |
25.03 |
65.00 |
62.90 |
75.06 |
71.71 |
m48 |
48.00 |
47.38 |
31.07 |
28.93 |
75.00 |
72.60 |
86.60 |
82.76 |
m56 |
56.00 |
55.26 |
36.2 |
33.80 |
85.00 |
82.20 |
98.15 |
93.71 |
m64 |
64.00 |
63.26 |
41.32 |
38.68 |
95.00 |
91.80 |
109.70 |
104.65 |
m72 |
72.00 |
71.26 |
46.45 |
43.55 |
105.00 |
101.40 |
121.24 |
115.60 |
m80 |
80.00 |
79.26 |
51.58 |
48.42 |
115.00 |
111.00 |
132.72 |
126.54 |
m90 |
90.00 |
89.13 |
57.74 |
54.26 |
130.00 |
125.50 |
150.11 |
143.07 |
m100 |
90.00 |
99.13 |
63.9 |
60.10 |
145.00 |
140.00 |
167.43 |
159.60 |
| MM THREADS AS PER IS 1363/67 | ||||||||||
| APPROXIMATE WEIGHT IN KGS FOR 100 NOS | ||||||||||
| LENGTH | DIAMETER | |||||||||
| M 5 | M 6 | M 8 | M 10 | M 12 | M 14 | M 16 | M 18 | M 20 | M 22 | |
| 16 mm | 0.448 | 0.743 | 1.590 | 3.211 | ||||||
| 20 mm | 0.598 | 0.812 | 1.711 | 3.411 | 4.892 | |||||
| 25 mm | 0.660 | 0.897 | 1.871 | 3.660 | 5.252 | 8.170 | ||||
| 30 mm | 0.737 | 1.010 | 2.070 | 3.912 | 5.574 | 9.690 | 10.707 | 18.657 | ||
| 35 mm | 0.804 | 1.120 | 2.271 | 4.223 | 5.974 | 10.000 | 11.416 | 16.026 | 19.608 | |
| 40 mm | 0.881 | 1.230 | 2.470 | 4.533 | 6.410 | 10.288 | 12.107 | 16.667 | 20.747 | |
| 45 mm | 0.958 | 1.340 | 2.671 | 4.840 | 6.859 | 10.504 | 12.821 | 17.241 | 21.739 | |
| 50 mm | 1.030 | 1.450 | 2.870 | 5.155 | 7.299 | 11.261 | 13.624 | 17.857 | 22.727 | 28.409 |
| 55 mm | 1.560 | 3.071 | 5.464 | 7.740 | 11.628 | 14.409 | 18.868 | 23.810 | 30.120 | |
| 60 mm | 1.670 | 3.270 | 5.774 | 8.183 | 12.255 | 15.244 | 20.000 | 25.126 | 32.051 | |
| 65 mm | 1.781 | 3.472 | 6.083 | 8.621 | 12.626 | 16.026 | 21.008 | 26.455 | 34.014 | |
| 70 mm | 1.890 | 3.671 | 6.394 | 9.058 | 12.987 | 16.835 | 22.124 | 27.778 | 35.461 | |
| 75 mm | 2.000 | 3.873 | 6.702 | 9.506 | 13.228 | 17.606 | 23.256 | 29.070 | 39.063 | |
| 80 mm | 2.111 | 4.072 | 7.013 | 10.000 | 13.889 | 18.248 | 24.510 | 30.303 | 40.000 | |
| 90 mm | 4.472 | 7.634 | 10.917 | 14.925 | 19.841 | 26.042 | 33.113 | 41.667 | ||
| 100 mm | 4.873 | 8.251 | 11.820 | 16.340 | 21.459 | 27.778 | 35.714 | 46.296 | ||
| 110 mm | 8.881 | 12.723 | 17.730 | 23.041 | 31.250 | 38.168 | 47.170 | |||
| 120 mm | 9.506 | 13.624 | 18.797 | 24.631 | 32.895 | 40.984 | 50.000 | |||
| 130 mm | 10.101 | 14.535 | 20.000 | 26.316 | 34.722 | 43.478 | 52.632 | |||
| 140 mm | 10.707 | 15.432 | 20.833 | 27.933 | 35.461 | 46.296 | 55.556 | |||
| 150 mm | 11.312 | 16.340 | 22.222 | 29.412 | 37.594 | 48.544 | 58.824 | |||
| 160 mm | 11.905 | 17.241 | 24.272 | 31.056 | 40.984 | 50.505 | 61.728 | |||
| 170 mm | 12.500 | 18.116 | 32.680 | 53.191 | 64.935 | |||||
| 180 mm | 13.123 | 19.011 | 26.882 | 34.247 | 55.556 | 67.568 | ||||
| 190 mm | 13.736 | 19.920 | 35.971 | 58.140 | 70.423 | |||||
| 200 mm | 14.327 | 20.833 | 29.586 | 37.594 | 49.020 | 60.976 | 73.529 | |||
| 220 mm | 15.528 | 22.624 | 40.650 | 65.789 | 79.365 | |||||
| 240 mm | 16.722 | 24.510 | 43.860 | 71.429 | 84.746 | |||||
| 250 mm | 17.301 | 25.381 | 45.455 | 74.627 | 87.719 | |||||
| 260 mm | 17.921 | 26.316 | 47.170 | 76.923 | 90.909 | |||||
| 280 mm | 19.157 | 28.090 | 50.505 | 81.967 | 98.039 | |||||
| 300 mm | 20.325 | 29.940 | 53.763 | 87.719 | 104.167 | |||||
| 320 mm | 31.646 | 56.818 | 92.593 | |||||||
| 340 mm | 33.557 | 60.241 | 98.039 | |||||||
| 360 mm | 35.211 | 63.291 | 104.167 | |||||||
| 380 mm | 37.037 | 66.667 | 108.696 | |||||||
| 400 mm | 39.063 | 69.444 | 113.636 | |||||||
| Class 150 Flanges ASME B16.5 (Stud bolt sizes) | Length of Stud Bolts | |||||||
| NPS | Outside Diameter of Flange | The diameter of Bolt Circle | The diameter of Bolt Holes | Number of Bolts | Diameter of Bolts | Raised Face 0.06 in |
Ring Joint | |
| 1/2 | 3 1/2 | 2 3/8 | 5/8 | 4 | 1/2 | 2 1/4 | – | |
| 3/4 | 3 7/8 | 2 3/4 | 5/8 | 4 | 1/2 | 2 1/2 | – | |
| 1 | 4 1/4 | 3 1/8 | 5/8 | 4 | 1/2 | 2 1/2 | 3 | |
| 1 1/4 | 4 5/8 | 3 1/2 | 5/8 | 4 | 1/2 | 2 3/4 | 3 1/4 | |
| 1 1/2 | 5 | 3 7/8 | 5/8 | 4 | 1/2 | 2 3/4 | 3 1/4 | |
| 2 | 6 | 4 3/4 | 3/4 | 4 | 5/8 | 3 1/4 | 3 3/4 | |
| 2 1/2 | 7 | 5 1/2 | 3/4 | 4 | 5/8 | 3 1/2 | 4 | |
| 3 | 7 1/2 | 6 | 3/4 | 4 | 5/8 | 3 1/2 | 4 | |
| 3 1/2 | 8 1/2 | 7 | 3/4 | 8 | 5/8 | 3 1/2 | 4 | |
| 4 | 9 | 7 1/2 | 3/4 | 8 | 5/8 | 3 1/2 | 4 | |
| 5 | 10 | 8 1/2 | 7/8 | 8 | 3/4 | 3 3/4 | 4 1/4 | |
| 6 | 11 | 9 1/2 | 7/8 | 8 | 3/4 | 4 | 4 1/2 | |
| 8 | 13 1/2 | 11 3/4 | 7/8 | 8 | 3/4 | 4 1/4 | 4 3/4 | |
| 10 | 16 | 14 3/4 | 1 | 12 | 7/8 | 4 1/2 | 5 | |
| 12 | 19 | 17 | 1 | 12 | 7/8 | 4 3/4 | 5 1/4 | |
| 14 | 21 | 18 3/4 | 1 1/8 | 12 | 1 | 5 1/4 | 5 3/4 | |
| 16 | 23 1/2 | 21 1/4 | 1 1/8 | 16 | 1 | 5 1/4 | 5 3/4 | |
| 18 | 25 | 22 3/4 | 1 1/4 | 16 | 1 1/8 | 5 3/4 | 6 1/4 | |
| 20 | 27 1/2 | 25 | 1 1/4 | 20 | 1 1/8 | 6 1/4 | 6 3/4 | |
| 24 | 32 | 29 1/2 | 1 1/4 | 20 | 1 1/4 | 6 3/4 | 7 1/4 | |
| Class 300 Flanges ASME B16.5 | Length of Stud Bolts | |||||||
| NPS | Outside Diameter of Flange | The diameter of Bolt Circle | The diameter of Bolt Holes | Number of Bolts | Diameter of Bolts | Raised Face 0.06 in |
Ring Joint | |
| 1/2 | 3 3/4 | 2 5/8 | 5/8 | 4 | 1/2 | 2 1/2 | 3 | |
| 3/4 | 4 5/8 | 3 1/4 | 3/4 | 4 | 5/8 | 3 | 3 1/2 | |
| 1 | 4 7/8 | 3 1/2 | 3/4 | 4 | 5/8 | 3 | 3 1/2 | |
| 1 1/4 | 5 1/4 | 3 7/8 | 3/4 | 4 | 5/8 | 3 1/4 | 3 3/4 | |
| 1 1/2 | 6 1/8 | 4 1/2 | 7/8 | 4 | 3/4 | 3 1/2 | 4 | |
| 2 | 6 1/2 | 5 | 3/4 | 8 | 5/8 | 3 1/2 | 4 | |
| 2 1/2 | 7 1/2 | 5 7/8 | 7/8 | 8 | 3/4 | 4 | 4 1/2 | |
| 3 | 8 1/4 | 6 5/8 | 7/8 | 8 | 3/4 | 4 1/4 | 4 3/4 | |
| 3 1/2 | 9 | 7 1/4 | 7/8 | 8 | 3/4 | 4 1/4 | 5 | |
| 4 | 10 | 7 7/8 | 7/8 | 8 | 3/4 | 4 1/2 | 5 | |
| 5 | 11 | 9 1/4 | 7/8 | 8 | 3/4 | 4 3/4 | 5 1/4 | |
| 6 | 12 1/2 | 10 5/8 | 7/8 | 12 | 3/4 | 4 3/4 | 5 1/2 | |
| 8 | 15 | 13 | 1 | 12 | 7/8 | 5 1/2 | 6 | |
| 10 | 17 1/2 | 15 1/4 | 1 1/8 | 16 | 1 | 6 1/4 | 6 3/4 | |
| 12 | 20 1/2 | 17 3/4 | 1 1/4 | 16 | 1 1/8 | 6 3/4 | 7 1/4 | |
| 14 | 23 | 20 1/4 | 1 1/4 | 20 | 1 1/8 | 7 | 7 1/2 | |
| 16 | 25 1/2 | 22 1/2 | 1 3/8 | 20 | 1 1/4 | 7 1/2 | 8 | |
| 18 | 28 | 24 3/4 | 1 3/8 | 24 | 1 1/4 | 7 3/4 | 8 1/4 | |
| 20 | 30 1/2 | 27 | 1 3/8 | 24 | 1 1/4 | 8 | 8 3/4 | |
| 24 | 36 | 32 | 1 5/8 | 24 | 1 1/2 | 9 | 10 | |
Flange Size |
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 |
|||||||
Dwg/No. |
2nd |
1st |
Final |
Bolt Size |
Dwg*/No. |
2nd |
1st |
Final |
Bolt Size |
|
3/4 |
4-bolt |
27 |
13 |
40 |
1/2 |
4-bolt |
40 |
20 |
60 |
1/2 |
1/2 |
4-bolt |
20 |
10 |
30 |
1/2 |
4-bolt |
40 |
20 |
60 |
1/2 |
1-1/4 |
4-bolt |
40 |
20 |
60 |
1/2 |
4-bolt |
40 |
20 |
60 |
1/2 |
1 |
4-bolt |
30 |
15 |
50 |
1/2 |
4-bolt |
40 |
20 |
60 |
1/2 |
2 |
4-bolt |
80 |
40 |
120 |
5/8 |
4-bolt |
80 |
40 |
120 |
5/8 |
1-1/2 |
4-bolt |
40 |
20 |
60 |
1/2 |
4-bolt |
40 |
20 |
60 |
1/2 |
3 |
4-bolt |
80 |
40 |
120 |
5/8 |
4-bolt |
80 |
40 |
120 |
5/8 |
2-1/2 |
4-bolt |
80 |
40 |
120 |
5/8 |
4-bolt |
80 |
40 |
120 |
5/8 |
4 |
8-bolt |
80 |
40 |
120 |
5/8 |
8-bolt |
80 |
40 |
120 |
5/8 |
3-1/2 |
8-bolt |
80 |
40 |
120 |
5/8 |
8-bolt |
80 |
40 |
120 |
5/8 |
6 |
8-bolt |
120 |
60 |
200 |
3/4 |
8-bolt |
120 |
60 |
200 |
3/4 |
5 |
8-bolt |
120 |
60 |
200 |
3/4 |
8-bolt |
120 |
60 |
200 |
3/4 |
10 |
12-bolt |
190 |
95 |
320 |
7/8 |
12-bolt |
190 |
95 |
320 |
7/8 |
24 |
20-bolt |
600 |
300 |
1,000 |
1-1/4 |
20-bolt |
600 |
300 |
1,000 |
1-1/4 |
8 |
8-bolt |
120 |
60 |
200 |
3/4 |
8-bolt |
120 |
60 |
200 |
3/4 |
14 |
12-bolt |
294 |
147 |
490 |
1 |
12-bolt |
294 |
147 |
490 |
1 |
12 |
12-bolt |
190 |
95 |
320 |
7/8 |
12-bolt |
190 |
95 |
320 |
7/8 |
18 |
16-bolt |
426 |
213 |
710 |
1-1/8 |
16-bolt |
426 |
213 |
710 |
1-1/8 |
16 |
16-bolt |
294 |
147 |
490 |
1 |
16-bolt |
294 |
147 |
490 |
1 |
20 |
20-bolt |
426 |
213 |
710 |
1-1/8 |
20-bolt |
426 |
213 |
710 |
1-1/8 |
Flange Size |
B16.5 Class 300 RF/ Ring Gaskets |
||||
|---|---|---|---|---|---|
Torque / Round (ft-lbs) |
Stud Bolts Tighten Sequence* |
||||
2nd |
1st |
Final |
Stud Bolts Size |
Dwg/No. |
|
3/4 |
30 |
15 |
50 |
5/8 |
4-bolt |
1/2 |
20 |
10 |
30 |
1/2 |
4-bolt |
1-1/4 |
60 |
30 |
100 |
5/8 |
4-bolt |
1 |
42 |
21 |
70 |
5/8 |
4-bolt |
2 |
66 |
33 |
110 |
5/8 |
8-bolt |
1-1/2 |
90 |
45 |
150 |
3/4 |
4-bolt |
2-1/2 |
84 |
42 |
140 |
3/4 |
8-bolt |
3-1/2 |
120 |
60 |
200 |
3/4 |
8-bolt |
3 |
120 |
60 |
200 |
3/4 |
8-bolt |
5 |
120 |
60 |
200 |
3/4 |
8-bolt |
4 |
120 |
60 |
200 |
3/4 |
8-bolt |
24 |
930 |
465 |
1,550 |
1-1/2 |
24-bolt |
8 |
190 |
95 |
320 |
7/8 |
12-bolt |
6 |
120 |
60 |
200 |
3/4 |
12-bolt |
10 |
294 |
147 |
490 |
1 |
16-bolt |
14 |
390 |
195 |
650 |
1-1/8 |
20-bolt |
12 |
426 |
213 |
710 |
1-1/8 |
16-bolt |
18 |
600 |
300 |
1,000 |
1-1/4 |
24-bolt |
16 |
546 |
273 |
910 |
1-1/4 |
20-bolt |
20 |
600 |
300 |
1,000 |
1-1/4 |
24-bolt |
Hastelloy C276 bolts are used in industries where standard fasteners cannot withstand chemical attack or extreme environmental stress. They are widely adopted in high-value engineering systems requiring long-term reliability.
Hastelloy C276 bolts are manufactured using controlled cold forging and precision CNC machining to maintain dimensional accuracy and grain structure integrity. The production process is designed to preserve the alloy’s corrosion-resistant properties while achieving high mechanical strength.
Each batch undergoes strict quality inspection including dimensional verification, hardness testing, and surface finish evaluation. Lot traceability ensures full material documentation from raw alloy sourcing to final dispatch.
All products supplied by KK Fasteners are aligned with ISO 9001 quality management systems, with optional compliance to RoHS and REACH standards for international regulatory requirements. This ensures reliability in both industrial and export applications where safety and performance validation are critical.

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Hastelloy C276 bolts are high-performance nickel-based alloy fasteners designed for extreme corrosion resistance. They are widely used in chemical processing, marine, and high-temperature industrial systems where standard stainless steel bolts fail due to acids, chlorides, or oxidizing environments.
Hastelloy C276 contains nickel, molybdenum, and chromium, which provide exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking. This makes it ideal for exposure to strong acids like hydrochloric and sulfuric acid, as well as seawater and chemical vapors.
These bolts are commonly manufactured in compliance with ASTM B574 and international dimensional standards such as DIN 933, DIN 931, ISO 4014, and ISO 4017, ensuring global compatibility and engineering reliability.
They are used in chemical plants, offshore oil and gas platforms, desalination units, power generation systems, pharmaceutical equipment, and pollution control systems where corrosion resistance and long service life are critical.
A reliable supplier should offer certified materials, full traceability, ISO-compliant manufacturing, and export experience. Buyers should also check testing documentation and consistency in quality across batches. Suppliers like KK Fasteners provide documented quality assurance and global supply capability.
Hastelloy C276 bolts are critical components for environments where corrosion failure is not an option. With precision manufacturing, certified material sourcing, and export-ready supply systems, KK Fasteners supports industrial buyers with reliable fastening solutions tailored to global engineering standards.
Request a detailed quotation or technical datasheet to evaluate specifications for your next project and ensure secure, long-term fastening performance in demanding applications.