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Incoloy 800H/800HT Bolts

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Manufacturer, Exporter & Supplier of Incoloy 800H/800HT Bolts

Incoloy 800H/800HT High-Temperature Bolts for Industrial Applications

Incoloy 800H/800HT bolts are engineered nickel-iron-chromium alloy fasteners designed for extreme thermal environments where conventional stainless steel fasteners fail due to creep, oxidation, or structural weakening. These bolts maintain mechanical integrity in temperatures typically exceeding 600°C, making them essential for heat-intensive industries such as petrochemical processing, power generation, heat treatment furnaces, and nuclear engineering systems.

Incoloy 800H/800HT Bolts Manufacturer

Manufactured in compliance with international standards such as ASTM B564 and related nickel alloy specifications, these fasteners offer a balanced combination of high-temperature strength and resistance to carburization and oxidation. The addition of controlled carbon, aluminum, and titanium stabilizes the alloy microstructure, improving long-term creep rupture strength in demanding conditions.

KK Fasteners supplies these high-performance bolts to global EPC contractors and industrial OEMs, ensuring full traceability, dimensional accuracy, and material certification for every production batch. For engineers working in thermally aggressive environments, these fasteners are not optional—they are critical to system reliability and safety.

Technical Specifications

Parameter Specification
Material Incoloy 800H / 800HT (Nickel-Iron-Chromium Alloy)
Grades 800H (High Carbon), 800HT (Controlled Ti/Al for creep strength)
Size Range M6 to M100 / 1/4" to 4" diameter
Thread Types Metric (ISO), UNC, UNF, BSW
Standards ASTM B564, ASTM B408, DIN 933, ISO 4014, ASME SB specifications
Surface Finish Bright, Pickled, Passivated, Polished
Fastener Types Hex Bolt, Stud Bolt, Heavy Hex Bolt, Socket Head Bolt
Tensile Strength ≥ 500 MPa (varies with heat treatment condition)

Chemical Composition Of Incoloy 800H/800HT Bolts

Grade C Mn Si Fe S Cr Al-Ti Ni
Incoloy 800H min. 0.05 – – 39.5 – 19.0 0.15 30.0
max. 0.1 1.5 1.0 – 0.015 23.0 0.60 35.0
Incoloy 800HT min. 0.06 – – 39.5 – 19.0 0.85/0.25 30.0
max. 0.1 1.5 1.0 – 0.015 23.0 1.20/0.60 35.0

Mechanical Properties Of Incoloy 800H/800HT Bolts

Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
Rockwell B (HR B) max Brinell (HB) max
Incoloy 800H/800HT Psi – 75,000 , MPa – 520 Psi – 30,000 , MPa –205 30 – –

Equivalent Grades for Incoloy 800H/800HT Bolt

STANDARD WERKSTOFF NR. UNS JIS BS GOST AFNOR EN OR
Incoloy 800H 1.4958 / 1.4876 N08810 NCF 800H NA 15(H) ЭИ670 Z8NC33-21 X5NiCrAlTi31-20 XH32T
Incoloy 800HT 1.4859 / 1.4876 N08811 NCF 800HT NA 15(HT) ЭИ670 – X8NiCrAlTi32-21 XH32T

Incoloy 800H/800HT Bolts Dimension

Hex Bolt Dimension

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

Incoloy 800H/800HT Bolts Weight Chart

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

ASME SB408 Incoloy 800H/800HT Stud Bolt Size Chart

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

Different Types of Incoloy 800H/800HT Bolts

  • Incoloy 800H/800HT Flanged Bolts
  • Incoloy 800H/800HT Hex Bolts
  • Incoloy 800H/800HT U Bolts
  • Incoloy 800H/800HT Shoulder Bolts
  • Incoloy 800H/800HT Eye Bolts
  • Incoloy 800H/800HT Heavy Hex Bolts
  • Incoloy 800H/800HT Hollow Hex Bolts
  • Incoloy 800H/800HT Hollow Allen Bolts
  • Incoloy 800H/800HT Machine Bolts
  • Incoloy 800H/800HT Socket Head Bolts
  • Incoloy 800H/800HT Hex Flange Bolts
  • Incoloy 800H/800HT Lag Bolts
  • Incoloy 800H/800HT J Bolts
  • Incoloy 800H/800HT Elevator Bolts
  • Incoloy 800H/800HT Hanger Bolts
  • Incoloy 800H/800HT Carriage Bolts
  • Incoloy 800H/800HT Allen Bolts
  • Incoloy 800H/800HT Anchor Bolts
  • Incoloy 800H/800HT Countersunk Bolts
  • Incoloy 800H/800HT Stud Bolts
  • Incoloy 800H/800HT Square Head Bolts
  • Incoloy 800H/800HT Stud Bolts
  • Incoloy 800H/800HT Full Threaded Stud Bolts
  • Incoloy 800H/800HT Tap End Stud Bolts
  • Incoloy 800H/800HT Double End Stud Bolts
  • Incoloy 800H/800HT Reduced Shank Stud Bolts
  • Incoloy 800H/800HT Flange Bolting Stud Bolts
  • Incoloy 800H/800HT Weld Studs
  • Incoloy 800H/800HT Threaded Rods
  • Incoloy 800H/800HT Hex Head Bolts
  • Incoloy 800H/800HT Jack Bolts
  • Incoloy 800H/800HT Structural Bolts
  • Incoloy 800H/800HT Step Bolts
  • Incoloy 800H/800HT Square Head Machine Bolts
  • Incoloy 800H/800HT Plow Bolts
  • Incoloy 800H/800HT Metric Bolts
  • Incoloy 800H/800HT Hex Tap Bolts
  • Incoloy 800H/800HT Hex Machine Bolts
  • Incoloy 800H/800HT Shoulder Eye Bolts
  • Incoloy 800H/800HT Serrated Flange Bolts
  • Incoloy 800H/800HT Turned Eye Bolts
  • Incoloy 800H/800HT Long Bolts
  • Incoloy 800H/800HT Bent Bolts
  • Incoloy 800H/800HT Square U Bolts
  • Incoloy 800H/800HT Timber Bolts
  • Incoloy 800H/800HT 12 Point Flange Bolts
  • Incoloy 800H/800HT Button Head Bolts
  • Incoloy 800H/800HT Hexagon Flange Bolts
  • Incoloy 800H/800HT Stud Bolts
  • Incoloy 800H/800HT Hexagon Head Bolts
  • Incoloy 800H/800HT Lifting Eye Bolts
  • Incoloy 800H/800HT T Bolts
  • Incoloy 800H/800HT Threaded Bolts

Key Technical Features

  • High-temperature structural stability — Maintains mechanical strength under prolonged exposure above 600°C, making it suitable for furnace and reactor assemblies.
  • Excellent creep resistance — Engineered microstructure minimizes deformation under sustained mechanical stress at elevated temperatures.
  • Oxidation and carburization resistance — Nickel-chromium matrix prevents scaling and surface degradation in oxidizing atmospheres.
  • Precision machining tolerance — Manufactured with tight dimensional control ensuring perfect fit in ISO/DIN-compliant assemblies.
  • Thermal fatigue resistance — Performs reliably under repeated heating and cooling cycles without cracking or embrittlement.
  • Corrosion resistance in harsh media — Suitable for petrochemical environments with sulfur-bearing gases and acidic exposure.
  • Load-bearing efficiency — Designed for high axial load applications in structural and pressure systems.
  • Traceable metallurgical certification — Each batch includes heat number traceability and mechanical test reports for quality assurance.

Industry Applications

Incoloy 800H/800HT bolts are used in high-temperature and corrosive industrial environments where long-term mechanical stability is critical. These fasteners are commonly selected for systems operating under thermal stress, pressure cycles, and chemically aggressive atmospheres.

  • Petrochemical Processing Units — Used in reactors, reformers, and heat exchanger assemblies exposed to hydrocarbon cracking conditions.
  • Thermal Power Plants — Securing boiler components, superheater sections, and high-pressure steam lines.
  • Industrial Furnaces & Heat Treatment Equipment — Holding refractory linings and structural furnace frames under extreme heat.
  • Nuclear Engineering Systems — Applied in non-core structural assemblies requiring radiation and heat resistance.
  • Oil & Gas Refineries — Used in piping supports and flange joints exposed to sulfur-rich gases.
  • Chemical Processing Plants — Ideal for equipment handling oxidizing acids and high-temperature reaction vessels.
  • Heat Exchangers — Ensures structural integrity in continuous high-temperature fluid transfer systems.
  • Power Generation Turbines — Used in auxiliary fastening systems exposed to thermal cycling and vibration.

Manufacturing & Quality Assurance

The manufacturing of Incoloy 800H/800HT bolts involves controlled hot forging followed by precision machining to achieve required dimensional accuracy. The alloy is solution-annealed to stabilize its microstructure and enhance high-temperature performance. CNC threading ensures compliance with ISO and DIN tolerances.

Quality inspection includes dimensional verification, hardness testing, tensile strength evaluation, and surface integrity checks. Each batch undergoes heat number traceability to ensure full material certification compliance.

KK Fasteners implements strict quality control aligned with ISO 9001 standards, ensuring every fastener meets global engineering expectations. Additional compliance with RoHS and REACH ensures suitability for international industrial supply chains.

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Incoloy 800H/800HT Bolts - FAQs

Incoloy 800H/800HT bolts are nickel-iron-chromium alloy fasteners designed for high-temperature service. They maintain strength, oxidation resistance, and creep stability in environments above 600°C, making them ideal for petrochemical, furnace, and power generation applications where conventional steel bolts fail.

800H contains higher carbon content for improved tensile strength, while 800HT includes controlled titanium and aluminum additions that enhance creep rupture resistance. 800HT is preferred for long-duration high-stress thermal applications, whereas 800H suits moderate exposure conditions.

These bolts are commonly manufactured under ASTM B564 for forgings and related ASME specifications for nickel alloys. Dimensional standards include DIN 933, ISO 4014, UNC, and UNF thread series depending on application requirements.

They are used in petrochemical reactors, thermal power plants, heat exchangers, furnaces, and chemical processing equipment. Their high-temperature strength and oxidation resistance make them suitable for continuous thermal and corrosive industrial environments.

Buyers should evaluate material traceability, ISO certifications, compliance with ASTM standards, and testing capabilities. A reliable supplier provides mill test certificates and consistent quality control. KK Fasteners supplies certified fasteners with full documentation for global industrial projects.

Incoloy 800H/800HT Bolts - Export Destination

Incoloy 800H/800HT Bolts Supplier in North America
Antigua and Barbuda, Bahamas, Barbados, Belize, Canada, Costa Rica, Cuba, Dominica, Dominican Republic, El Salvador, Grenada, Guatemala, Haiti, Honduras, Jamaica, Mexico, Nicaragua, Panama, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad and Tobago, United States.
Incoloy 800H/800HT Bolts Supplier in South America
Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Falkland Islands, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela.
Incoloy 800H/800HT Bolts Supplier in Europe
Albania, Andorra, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic (Czechia), Denmark, Estonia, Finland, France, Germany, Greece, Holy See, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, Montenegro, Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, Russia, San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom.
Incoloy 800H/800HT Bolts Supplier in Asia
Afghanistan, Armenia, Azerbaijan, Bahrain, Bangladesh, Bhutan, Brunei, Cambodia, Cyprus, Georgia, India, Indonesia, Iran, Iraq, Israel, Japan, Jordan, Kazakhstan, Kuwait, Kyrgyzstan, Laos, Lebanon, Malaysia, Maldives, Mongolia, Myanmar, Nepal, Oman, Pakistan, Palestine, Philippines, Qatar, Saudi Arabia, Singapore, South Korea, Sri Lanka, State of Palestine, Syria, Taiwan, Tajikistan, Thailand, Timor-Leste, Turkey, Turkmenistan, United Arab Emirates, Uzbekistan, Vietnam, Yemen.
Incoloy 800H/800HT Bolts Supplier in Australia
Australia, Fiji, Kiribati, Marshall Islands, Micronesia, Nauru, New Zealand, Palau, Papua New Guinea, Samoa, Solomon Islands, Tonga, Tuvalu, Vanuatu.

For high-temperature critical applications, material reliability is non-negotiable, and Incoloy fasteners play a decisive role in system safety and uptime. With controlled alloy chemistry and precision manufacturing, KK Fasteners delivers bolts engineered for demanding industrial environments with full export documentation and engineering support.

Request technical drawings or a quotation today to source application-ready Incoloy 800H/800HT bolts for your project specifications.

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