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Alloy 330 Fasteners

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Alloy 330 Hex Bolts

Alloy 330 Hex Bolts are specifically designed for high temperature furnace applications such as vacuum furnaces, heat treating and brazing applications. The most prized trait of alloy 330 is its ability perform under cyclic conditions of temperature extremes from heating and cooling; as well as in alternate carburizing and oxidizing atmospheres. An austenitic, nickel-chromium-iron-silicon alloy, Alloy 330 Hex Bolts also offer industry a low coefficient of expansion, excellent ductility, and high strength.

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An engineered high temperature resistant steel
Excellent high temperature stability and chemistry and specifications
Very oxidation and carburization resistant to 2100°F
Good resistance to thermal shock and quenching
Resistance to thermal shock from repeated quenching
High level of resistance to oxidation and carburization
Ability to handle thermal cycling
Provides resistance to scale formation up to about 2000°F
Good resistance to nitrogen-containing atmospheres where the oxygen content is low
High nickel content of 34-37% provides high resistance to chloride stress corrosion cracking and embrittlement

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RAYCHIN LIMITED

Name: Alloy 330 Hex Bolts
SKU: 0

Specialist in Alloy 330 Hex Bolts · UNS N08330 · 1.4886

Alloy 330 Hex Bolts: High‑Strength Fasteners for Extreme Heat

Austenitic Nickel‑Chromium‑Iron‑Silicon Alloy (UNS N08330 / 1.4886 / X12NiCrSi35-16)

RAYCHIN LIMITED is a premier manufacturer of Alloy 330 Hex Bolts. Designed for demanding furnace environments, these bolts feature a six‑head head for easy installation with standard wrenches. Our Alloy 330 hex bolts withstand oxidation, carburization, and thermal shock up to 1150°C. Available in finished hex, heavy hex, and structural styles, with full or partial thread. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS – or fully custom to your drawing. Supplied with matching Alloy 330 hex nuts upon request.

Alloy 330 Hex BoltsAlloy 330 hex head boltsUNS N08330 hex bolts1.4886 hex boltshigh temperature hex boltsfurnace hex boltsAlloy 330 heavy hex boltsAlloy 330 finished hex boltsAlloy 330 structural boltsAlloy 330 machine bolts

Alloy 330 Hex Bolt – Product Range

Finished Hex Bolts

Alloy 330 finished hex bolts feature a chamfered point and closer tolerances for general-purpose high-temperature fastening. Ideal for furnace assemblies and heat treating fixtures.

UNC/UNFMetric coarse/fineFull thread

Sizes: #4 to 2" (M3 to M48)
Lengths: 1/4" to 12" (6mm to 300mm)

Heavy Hex Bolts

Alloy 330 heavy hex bolts have larger head dimensions for higher torque applications. Commonly used in flange connections and structural furnace supports.

ASME B18.2.1API flangesFull thread

Sizes: 1/2" to 4" (M12 to M100)

Structural Bolts

Alloy 330 structural bolts offer high clamping force for load-bearing connections in high-temperature structures and framework.

ASTM A325/A490Short threadHeavy hex head

Grades: Custom to order

Tap-End Stud Bolts

Alloy 330 tap-end stud bolts feature a longer thread on one end for permanent installation, with hex nut on the opposite end. Ideal for furnace covers and removable fixtures.

Double-endReduced shank

Hex Head Cap Screws

Alloy 330 hex head cap screws provide precision-threaded fastening for machinery and equipment in high-temperature processing lines.

DIN 931DIN 933ISO 4014

Custom Hex Bolts

Alloy 330 custom hex bolts manufactured to customer prints: special head heights, reduced body diameters, extra-long lengths, and left-hand threads.

Special drivesUndercut headsDrilled heads

International Standards & Global Designations for Alloy 330

Our Alloy 330 Hex Bolts are manufactured from material meeting these worldwide specifications:

Country / Region	Standard / Specification	Designation / Grade
USA	ASTM B511 / B512 / B535 / B536, ASME SB-511, AMS 5592, AMS 5716, SAE J405	UNS N08330 · Alloy 330 · RA330
Europe (CEN)	EN 10095, EN 10269 (fasteners), EN 10088-3	1.4886 · X12NiCrSi35-16
Germany (DIN)	DIN 17752, DIN 17470, DIN EN 1.4886	X12NiCrSi35-16 / 1.4886
France (NF)	NF A35-572/573 (historical)	Z12NCS35.16
China (GB)	GB/T 20878, GB/T 4238, GB/T 1220	0Cr12Ni35Si16 / S33010 / 330
Japan (JIS)	JIS G 4312, JIS G 4902	SUH330 / NCF 330
ISO	ISO 4955, ISO 13680	X12NiCrSi35-16

UNS N08330 1.4886 X12NiCrSi35-16 ASTM B511 AMS 5592 AMS 5716 SUH330 NAS 330 AN 330

Chemical Composition (Weight %) – Alloy 330 (UNS N08330 / 1.4886)

Our Alloy 330 hex bolts are produced from certified melts conforming to ASTM B511 / B536 limits:

Element	ASTM B511 / UNS N08330 Range %	Typical
Carbon (C)	≤ 0.08	0.05
Silicon (Si)	0.75 – 1.50	1.2
Manganese (Mn)	≤ 2.00	1.0
Phosphorus (P)	≤ 0.030	0.020
Sulfur (S)	≤ 0.030	0.010
Chromium (Cr)	17.0 – 20.0	19.0
Nickel (Ni)	34.0 – 37.0	35.5
Copper (Cu)	≤ 1.00	0.2
Molybdenum (Mo)	≤ 0.75	0.3
Iron (Fe)	Balance	Balance

Metallurgical note: High nickel (34‑37%) + chromium (17‑20%) + silicon (0.75‑1.5%) gives Alloy 330 exceptional resistance to oxidation, carburization, and thermal shock up to 1150°C. The silicon addition enhances oxide spallation resistance during thermal cycling, making these hex bolts ideal for furnace environments.

Complete Mechanical Properties – Alloy 330 Hex Bolts (Solution Annealed)

All hex bolts are supplied in the solution annealed condition (1038‑1066°C / water quench). Minimum tensile requirements per ASTM B511 for bar stock used in fasteners:

Property	Metric (min)	Imperial (min)
Tensile Strength (Rm)	585 – 750 MPa	85 – 109 ksi
Yield Strength 0.2% (Rp0.2)	≥ 205 – 290 MPa	≥ 30 – 42 ksi
Elongation (A5)	≥ 30 – 45%	≥ 30 – 45%
Hardness (HRB)	≤ 85 – 95 HRB	≤ 85 – 95 HRB
Modulus of Elasticity	196 GPa	28,400 ksi
Density	8.08 g/cm³	0.292 lb/in³

High Temperature Performance of Alloy 330 Hex Bolts

Alloy 330 is specifically formulated for elevated temperature service. The following data represent short‑time elevated temperature yield strength (0.2% offset) and stress rupture properties:

Temperature	Yield Strength Rp0.2 (approx.)	Rupture Strength (1000 h)
21°C (70°F)	205 – 290 MPa (30 – 42 ksi)	—
538°C (1000°F)	140 MPa (20.3 ksi)	—
649°C (1200°F)	130 MPa (18.9 ksi)	—
760°C (1400°F)	115 MPa (16.7 ksi)	48 MPa (7.0 ksi)
871°C (1600°F)	75 MPa (10.9 ksi)	21 MPa (3.1 ksi)
982°C (1800°F)	35 MPa (5.1 ksi)	8.6 MPa (1.25 ksi)
1093°C (2000°F)	20 MPa (2.9 ksi) (short time)	5.4 MPa (0.78 ksi)

Oxidation resistance: Continuous service in air up to 1150°C (2100°F); excellent resistance to scaling, carburization, and nitriding. The alloy remains fully austenitic at all temperatures, ensuring dimensional stability.

Thermal Stability & Physical Data

Maximum continuous service temperature (oxidizing)	1150°C (2100°F)
Solution annealing range	1038‑1066°C (1900‑1950°F)
Melting range	1371‑1427°C (2500‑2600°F)
Thermal conductivity at 500°C	21.6 W/m·K
Mean CTE (20‑1000°C)	18.0 ×10⁻⁶ /°C

Corrosion Resistance of Alloy 330 Hex Bolts

While Alloy 330 is optimized for high‑temperature environments, it offers good resistance to many corrosive conditions:

Oxidation & carburization: Exceptional resistance in air, combustion gases, and sulfur‑bearing atmospheres up to 1150°C. Silicon content enhances oxide adhesion.
Nitriding: Good resistance to nitrogen‑rich atmospheres (e.g., cracked ammonia), making it ideal for nitriding furnace components.
Stress corrosion cracking: High nickel content (34‑37%) provides immunity to chloride SCC in aqueous environments.
Aqueous corrosion: Similar to 310 stainless; suitable for organic acids, but NOT intended for strong reducing acids or chloride pitting environments.
Oxidizing sulfur: Performs well in oxidizing sulfur atmospheres; for reducing sulfur environments consult our engineers.
Sigma phase resistance: Alloy 330 remains fully austenitic and resists sigma phase embrittlement even after prolonged high-temperature exposure.

Corrosion note: Alloy 330 is not designed for seawater or strong chloride solutions (for those we offer 254 SMO). It excels in dry, oxidizing, carburizing, and nitriding atmospheres up to 1150°C.

Precision Manufacturing & Global Standards Compliance

Precision Heading & Heat Treatment

Our Alloy 330 hex bolts are hot forged or CNC machined from solution-annealed bar stock. Threads are rolled for improved grain flow and fatigue resistance. Each lot undergoes solution annealing (1038‑1066°C) and water quenching to guarantee optimum high‑temperature properties. Dimensional inspection ensures compliance with ASME/ISO standards.

Traceability & Third‑Party Testing

Full traceability from melt to finished product. Certificates EN 10204 3.1/3.2. NDT (PT, MT, UT) available on request. Our quality system: ISO 9001:2015, AS9100D. We also comply with NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS, JIS, GB. Custom hex bolts welcome.

Alloy 330 Hex Bolts – Typical Applications & Industries

Our Alloy 330 hex bolts are widely used in demanding high‑temperature assemblies:

Vacuum furnace hot zones
Heat treating baskets & fixtures
Radiant tube supports
Annealing covers & muffles
Gas turbine components
Petrochemical heater hangers
Exhaust system flanges
Salt bath furnace electrodes
Ceramic fiber module attachments
Boiler access doors
Quench system connections
Thermal oxidizer internals

We also supply matching Alloy 330 heavy hex nuts, flat washers, and threaded rods for complete high‑temperature bolting sets.

Why RAYCHIN LIMITED – The Alloy 330 Hex Bolt Authority

Metallurgical expertise

Engineers specializing in high‑temperature alloys. We guarantee proper solution annealing and rapid quench for every Alloy 330 hex bolt. In‑house PMI and mechanical testing.

Global approvals & inventory

ISO 9001:2015, AS9100D. Extensive stock of inch & metric sizes, finished and heavy hex. Fast turnaround for prototypes and emergency shutdowns.

Custom capabilities

Special head heights, non‑standard lengths, reduced shank, left‑hand threads, and custom drive configurations. High‑temperature anti‑seize coatings available.

Full compliance

Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS. Material certifications with full traceability. We speak English, German, Mandarin, Japanese.

Request a quote for Alloy 330 Hex Bolts – any standard or custom specification.

Contact our engineering team for application assistance, high‑temperature performance data, or NACE MR0175 suitability (case‑by‑case).

sales@ray-chin.com | +86 534 2166 566

ISO 9001:2015 · AS9100D · EN 10204 3.1/3.2 · third‑party inspection (DNV, Lloyds, TÜV) welcome.

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