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Alloy 330 12 Point Screws

Alloy 330 12 Point Screws 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, 330 fasteners also offer industry a low coefficient of expansion, excellent ductility, and high strength.

RAYCHIN SPECIALTY METALS FASTENERS: BOLTS, NUTS, SCREWS, WASHERS, STUDS, THREADED RODS, U-BOLT, J-BOLTS

STANDARD AND CUSTOMIZED, SMALL BATCH AND LARGE BATCH, IMPERIAL AND METRIC

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 12 Point Screws
SKU: 0

Specialist in Alloy 330 12 Point Screws · 12-Point Flange · Ferry Cap · Custom

Alloy 330 12 Point Screws: High-Temperature 12-Point Flange Screws for Critical Applications

UNS N08330 / W. Nr. 1.4886 / RA330 / Incoloy 330

RAYCHIN LIMITED is a recognized expert in Alloy 330 12 point screws — from Alloy 330 12-point flange screws, Alloy 330 ferry cap screws, Alloy 330 12 point head screws to custom non-standard configurations. Alloy 330 (UNS N08330) is an austenitic nickel-iron-chromium superalloy with silicon addition, specifically designed for high-temperature service up to 1150°C (2100°F). The 12-point head design features two overlapped hexagon shapes, creating 12 points of contact with a flanged underside. This design provides higher torque capability compared to socket head cap screws while eliminating recesses that could trap fluid or debris. The flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer. These screws are also referred to as ferry cap screws or 12-point flange screws. The alloy's high nickel content (34-37%) provides excellent resistance to chloride stress corrosion cracking and maintains a stable austenitic structure at all temperatures. Silicon addition (0.75-1.5%) enhances oxidation and carburization resistance at elevated temperatures. Our portfolio includes 12 point screws manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for extreme environments where high-temperature strength, corrosion resistance, and high torque capability are critical. Alloy 330 12 point screws are supplied in solution annealed condition with full traceability and third-party certifications.

Alloy 330 12 Point ScrewsAlloy 330 12-Point Flange ScrewsAlloy 330 Ferry Cap ScrewsAlloy 330 12 Point Head ScrewsUNS N08330 12 Point Screws1.4886 12 Point ScrewsRA330 12 Point ScrewsIncoloy 330 12 Point ScrewsASTM B511 12 Point ScrewsAMS 5716 12 Point Screwshigh temperature 12 point screwsheat resistant 12-point flange screwsgas turbine fastenersaerospace 12 point screwsthermal cycling resistant screwscarburization resistant 12 point screws

12-Point Screw Design & Advantages

Design Features

12-Point Drive: Two overlapped hexagon shapes create 12 points of contact for superior torque transfer.
Integrated Flange: Flanged underside eliminates need for separate washers and distributes pressure evenly.
Higher Torque Capability: Handles more torque than socket head or hex head screws.
No Fluid Traps: Lack of recess prevents trapping of fluid or debris in corrosive environments.
Space-Efficient: Heads are generally smaller than hex heads, ideal for tight installation spaces.

Application Advantages

Weight Savings: Smaller head size reduces overall weight in critical applications.
Cleanability: Smooth flange design prevents debris accumulation in sanitary applications.
High Preload: Higher torque capability allows greater preload in bolted joints.
Tool Compatibility: Standard 12-point sockets and wrenches are readily available.
Thermal Cycling Resistance: Stable design maintains clamp load through temperature changes.

Standards & Specifications

Metric	ISO 14581, DIN 34819
Inch	ASME B18.3 (12-point), SAE J1199
Aerospace	NAS178, NAS617, NAS620
Ferry Cap	ASME B18.3 (ferry cap)

Available in UNC, UNF, UNJF-3A, and metric coarse/fine thread configurations.

Complete Range of Alloy 330 12 Point Screws – Configurations

Standard 12-Point Flange Screws

Alloy 330 standard 12-point flange screws feature the classic 12-point head design with an integrated flange under the head. The driver uses two overlapped hexagon shapes, creating 12 points of contact for superior torque transfer. The flanged underside eliminates the need for separate washers and distributes clamping load evenly. Ideal for high-temperature applications up to 1150°C in gas turbines, furnace components, and heat exchangers. Available in sizes from #10 to 1" (M5 to M24) in various lengths. Supplied in solution annealed condition per ASTM B511.

Ferry Cap Screws (External Drive)

Alloy 330 ferry cap screws are a specific type of 12-point screw characterized by their external drive configuration. These screws feature a head that combines 12-point external drive with a smooth, round outer profile. The external drive allows for higher torque application while the smooth exterior prevents debris accumulation. Precision rolled threads for superior strength and high-temperature performance. Available in inch sizes from #10 to 1" and metric sizes from M5 to M24. Ideal for applications in tight spaces where weight savings and high torque are critical.

Aerospace & Custom 12-Point Screws

Alloy 330 aerospace 12-point screws manufactured to NAS and MS standards for critical aerospace applications. Need a special head configuration, unusual thread size, or custom drive for your high-temperature application? RAYCHIN engineers work with you to produce custom Alloy 330 12 point screws to your drawing. Options include extra-long lengths, reduced head height, and special thread classes. Expert heat treatment (solution annealed at 1038-1121°C) ensures optimum high-temperature performance. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS standards.

Key Benefits of Alloy 330 12 Point Screws

Exceptional High-Temperature Strength

Alloy 330 maintains useful mechanical properties up to 1150°C (2100°F). At 800°C, tensile strength remains at 150-200 MPa, significantly higher than standard stainless steels. Excellent creep strength at 980°C with 15-20 MPa for 1000 hours.

Higher Torque Capability

The 12-point drive provides more points of contact than hex or socket drives, allowing higher installation torque without damaging the fastener. Handles more torque than socket head cap screws of comparable size, enabling higher preload in critical joints.

Superior Carburization & Oxidation Resistance

Silicon addition (0.75-1.5%) enhances resistance to carburizing and oxidizing atmospheres up to 1150°C. Chromium forms a protective Cr₂O₃ scale, while silicon contributes to a complex silicate layer that provides exceptional protection in aggressive furnace environments.

Thermal Cycling Resistance

Stable austenitic structure at all temperatures provides excellent resistance to thermal shock and thermal fatigue. Low thermal expansion coefficient (14.4-18.0 x 10⁻⁶/°C) matches many ceramics and reduces stress during thermal cycling.

Integrated Flange Design

The flanged underside distributes pressure where the screw meets the surface, eliminating the need for separate washers. Reduces parts count and simplifies assembly in high-temperature environments.

Chloride SCC Immunity

With 34-37% nickel content, Alloy 330 offers practical immunity to chloride stress corrosion cracking, making it suitable for applications where both high temperature and chlorides are present.

Manufacturing Standards for Alloy 330 12 Point Screws

RAYCHIN LIMITED manufactures Alloy 330 12 point screws to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.

NASANMSANSIASTMASMESAEAPINACEISODINKSJISGB

International Standards & Global Designations for Alloy 330 12 Point Screws

To serve clients worldwide, RAYCHIN LIMITED manufactures Alloy 330 12 point screws from material conforming to the following national and international specifications.

Country / Region	Standard / Specification	Designation / Grade
USA	ASTM B511 / ASME SB511, ASTM B512, ASTM B535, ASTM B536, ASTM B710, ASTM B739, AMS 5716, AMS 5592, UNS N08330	Alloy 330 · RA330 · Incoloy 330
Germany (DIN)	W. Nr. 1.4886	1.4886 · X10NiCrSi35-19
Europe (CEN)	EN 10095, EN 10269	1.4864 (similar)
France (NF)	NF A35-572/573	Z20NCS33
UK (BS)	BS 3076	NA 17
China (GB)	GB/T 15007, GB/T 1220	NS3303 · 0Cr20Ni35Mo3Cu4Nb
Japan (JIS)	JIS G4903, JIS G4904	NCF 330
ISO	ISO 15156-3 (NACE MR0175)	UNS N08330

UNS N08330 1.4886 ASTM B511 ASME SB511 AMS 5716 RA330 Incoloy 330 NS3303

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

Our Alloy 330 12 point screws are produced from melts that strictly conform to the limits below per ASTM B511 / AMS 5716. The high nickel content provides immunity to chloride stress corrosion cracking and ensures austenitic stability. Chromium provides oxidation resistance, while silicon addition enhances carburization resistance at elevated temperatures.

Element	ASTM B511 / AMS 5716 (Range %)	Typical (analysis)
Nickel (Ni)	34.0 – 37.0	35.5
Chromium (Cr)	17.0 – 20.0	18.5
Silicon (Si)	0.75 – 1.50	1.15
Carbon (C)	≤ 0.08	0.05
Manganese (Mn)	≤ 2.00	1.2
Phosphorus (P)	≤ 0.030	0.015
Sulfur (S)	≤ 0.030	0.010
Molybdenum (Mo)	≤ 0.75	0.3
Copper (Cu)	≤ 0.50	0.2
Tin (Sn)	≤ 0.025	0.010
Lead (Pb)	≤ 0.005	0.002
Iron (Fe)	Balance	Balance

Expert note: The high nickel content (34-37%) ensures a stable austenitic structure at all temperatures, eliminating sigma phase embrittlement concerns. Silicon addition (0.75-1.5%) is critical for enhanced carburization resistance in furnace environments. Low carbon content (<0.08%) prevents sensitization and maintains corrosion resistance.

Complete Mechanical Properties of Alloy 330 12 Point Screws (per ASTM B511)

Alloy 330 12 point screws are supplied in the solution annealed condition (1038-1121°C followed by rapid cooling). The data below represent minimum requirements per ASTM B511 / AMS 5716 unless otherwise noted.

Room Temperature Mechanical Properties (Solution Annealed)

Property	Minimum Value	Typical Value	Notes
Ultimate Tensile Strength	550 MPa (80 ksi)	585-620 MPa (85-90 ksi)	Exceeds minimum requirements
Yield Strength (0.2% Offset)	240 MPa (35 ksi)	290-300 MPa (42-43.5 ksi)	Exceeds minimum requirements
Elongation	30%	40-50%	Excellent ductility
Hardness (Brinell)	223 HB max	150-190 HB	Typically 150-190 HB
Hardness (Rockwell B)	95 HRB max	70-85 HRB typical	≤95 HRB per AMS
Modulus of Elasticity	—	193-197 GPa (28.0-28.6 x 10³ ksi)	At room temperature
Poisson's Ratio	—	0.27-0.34	—

Elevated Temperature Mechanical Properties

Alloy 330 maintains useful mechanical properties at elevated temperatures up to approximately 1150°C (2100°F), making it ideal for furnace components and high-temperature processing equipment.

Temperature	Yield Strength (typical)	Tensile Strength (typical)	Retention (%)
Room Temperature (20°C)	300 MPa	620 MPa	100%
200°C (392°F)	275 MPa	590 MPa	90-95%
400°C (752°F)	260 MPa	570 MPa	85-90%
600°C (1112°F)	240 MPa	520 MPa	75-80%
800°C (1472°F)	150-200 MPa	—	50-65%
1000°C (1832°F)	—	Significant strength retained	Good creep resistance
1150°C (2100°F)	Maintains structural integrity		Maximum service temperature

Creep Strength

Temperature	Stress for 1000-hour life	Notes
980°C (1800°F)	15-20 MPa	Good creep resistance

Physical Properties

Property	Value
Density	8.00-8.08 g/cm³ (0.289-0.292 lb/in³)
Melting Point	1357 – 1430°C (2475 – 2606°F)
Thermal Expansion Coefficient (20-100°C)	14.4 x 10⁻⁶ /°C
Thermal Expansion Coefficient (20-500°C)	16.7 x 10⁻⁶ /°C
Thermal Expansion Coefficient (20-1000°C)	18.0 x 10⁻⁶ /°C
Thermal Conductivity (20°C)	12.3-12.5 W/m·K
Specific Heat Capacity	0.45-0.46 J/g·°C
Electrical Resistivity (RT)	1020 × 10⁻⁹ W-m
Magnetic Permeability	≤ 1.02 (non-magnetic)

Corrosion Resistance of Alloy 330 12 Point Screws

While Alloy 330 is primarily selected for high-temperature strength, it also offers good corrosion resistance in many environments due to its high nickel and chromium content.

High-Temperature Oxidation Resistance

Alloy 330 12 point screws offer excellent resistance to oxidation up to 1150°C (2100°F) in air and combustion atmospheres. The chromium forms a protective Cr₂O₃ scale, while silicon contributes to a complex silicate layer that provides exceptional protection in aggressive environments.

Carburization Resistance

The silicon addition (0.75-1.5%) provides outstanding resistance to carburization and nitriding at elevated temperatures. Alloy 330 12 point screws are widely used in furnace components and heat treating fixtures where carbonaceous atmospheres are present.

Resistance to Other Media

Environment	Resistance Level	Notes
Nitric Acid	Good	Chromium provides resistance to oxidizing acids
Sulfuric Acid	Moderate	Not as resistant as Alloy 20
Chloride Stress Corrosion Cracking	Excellent	High nickel content provides immunity
Caustic Solutions	Good	Resistant to caustic soda and potash
Seawater	Good	Moderate resistance to pitting
Sour Service (H₂S)	Good	Qualified per NACE MR0175

Special focus: Alloy 330 12 Point Screws for High-Temperature Applications

For critical applications requiring exceptional high-temperature strength, carburization resistance, and high torque capability, RAYCHIN offers Alloy 330 12 point screws manufactured to ASTM, ASME, NACE, and customer-specific specifications. Our capabilities include:

Gas Turbines: Combustion chamber fasteners, turbine casing screws, exhaust manifold bolts, heat shield attachments, compressor case screws.
Heat Treating Equipment: Furnace roller screws, radiant tube supports, muffles, retorts, heat treating fixtures, annealing covers.
Petrochemical Processing: Cracker tube supports, reformer tube hangers, furnace components, pyrolysis equipment.
Industrial Furnaces: Walking beam furnace screws, hearth roller fasteners, burner components, recuperator bolts.
Power Generation: Boiler component screws, superheater supports, heat exchanger fasteners, fluidized bed combustors.
Aerospace: Engine mount screws, thrust nozzle fasteners, transmission components, missile guidance systems, satellite components.
Standards: ISO 14581, DIN 34819 (metric), ASME B18.3 (inch), NAS178, NAS617, NAS620 (aerospace).
Thread Classes: 2A, 3A, UNJF-3A, 6g, 6H.
Sizes: #10 through 1", M5 through M24.
Certifications: EN 10204 3.1/3.2 material certifications, PED 2014/68/EU.

All Alloy 330 12 point screws are supplied with full traceability and third-party NDT upon request. Material certifications included.

Why RAYCHIN LIMITED – The Alloy 330 12 Point Screw Authority

Metallurgical competence

Engineers on staff with deep expertise in nickel-based superalloys. We ensure proper solution annealing (1038-1121°C) for optimal high-temperature strength across all Alloy 330 12 point screws. Every heat is verified by in-house PMI testing to confirm chemistry. With 34-37% nickel and silicon addition, our 12 point screws provide exceptional resistance to carburization, oxidation, and thermal cycling up to 1150°C.

Global approvals & traceability

Our quality system is ISO 9001:2015 and AS9100D certified; we also comply with NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS. Full material traceability from melt to final packaging (EN 10204 3.1/3.2). Third-party inspections (ABS, DNV, Lloyds) available. All Alloy 330 12 point screws meet applicable ASTM B511, ASME SB511, AMS 5716, and all relevant standards.

Precision head forming & thread rolling

In-house CNC cold heading and precision thread rolling capabilities ensure consistent head dimensions and thread geometry. Precision rolled threads provide superior fatigue life and dimensional accuracy. Accurate 12-point drive for positive wrench engagement. 100% thread and dimensional inspection available.

Custom solutions

Need a special head configuration, unusual drive, or custom material certification for your high-temperature application? Our engineering team works with you to produce custom Alloy 330 12 point screws to your drawing. We provide specialized surface treatments and processing per customer requirements.

Contact the Alloy 330 12 point screw experts today

Request a quote for Alloy 330 12 point screws, 12-point flange screws, ferry cap screws & custom configurations – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about high-temperature 12 point screws up to 1150°C, gas turbine fasteners, or carburization-resistant applications.

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