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Alloy 330 Vented Screws

Alloy 330 Vented 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, Alloy 330 Vented Screws 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

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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 Vented Screws
SKU: 0

Specialist in Alloy 330 Vented Screws · UNS N08330 · 1.4886

Alloy 330 Vented Screws: Eliminate Virtual Leaks in Extreme Heat

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

RAYCHIN LIMITED is a premier manufacturer of Alloy 330 Vented Screws. Specifically engineered for high‑vacuum furnace environments, these screws feature a precision-drilled axial vent hole that allows trapped gases to escape from blind threaded holes, eliminating virtual leaks and accelerating pump-down times. Our Alloy 330 vented screws withstand oxidation, carburization, and thermal shock up to 1150°C. Available in socket head, hex head, and button head configurations, with matching vented washers. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS – or fully custom to your drawing.

Alloy 330 Vented ScrewsAlloy 330 vacuum screwsUNS N08330 vented1.4886 vented screwshigh temperature vented screwsfurnace vented fastenersvirtual leak preventionAlloy 330 socket head ventedAlloy 330 hex head ventedvented washers

Alloy 330 Vented Screw – Product Range

Socket Head Vented

Alloy 330 socket head vented screws combine the strength of a socket cap with a precision axial vent hole. Ideal for confined spaces in vacuum furnaces and UHV systems.

Standard lengthExtra lengthMetric/UNC

Sizes: #0 to 1" (M1.6 to M24)
Vent diameters: 0.5mm to 3mm

Hex Head Vented

Alloy 330 hex head vented screws provide easy tool access and high torque capacity. The axial vent ensures complete gas evacuation from deep blind holes.

Heavy hexFinished hexFull thread

Sizes: #4 to 1-1/2" (M3 to M36)

Button Head Vented

Alloy 330 button head vented screws offer a low-profile head for clearance-limited assemblies while maintaining the venting function.

Low headTamper-resistant option

Drives: Hex socket, Torx available

Flat Head Vented

Alloy 330 flat head vented screws provide flush mounting with 82° or 90° countersink. The vent exits through the head for complete outgassing.

82°90°Slotted/Phillips

Vented Washers

Alloy 330 vented washers feature radial grooves or drilled canals to vent trapped gases beneath the screw head. Used in combination with standard or vented screws.

Grooved faceDrilled radialCustom patterns

Custom Vented Designs

Alloy 330 custom vented screws manufactured to customer prints: special head styles, multiple vent holes, cross-drilled vents, and shoulder screw configurations.

Cross-drilledAngled ventsStep vents

The Venting Advantage: Eliminating Virtual Leaks

What is a virtual leak? In vacuum systems, trapped gases in blind threaded holes, cracks, or crevices slowly outgas into the chamber, mimicking a real leak and prolonging pump-down times. These virtual leaks can compromise process integrity and yield.

How Alloy 330 vented screws solve this: A precision-drilled axial vent hole through the center of the screw provides a direct path for trapped gases to escape from the bottom of blind holes. When used with vented washers, even gases under the screw head are evacuated, ensuring complete degassing.

Benefits in high-temperature vacuum furnaces:

Faster, more efficient pump-down of HV & UHV systems
Eliminates virtual leaks from fastener cavities
Relieves pressure from blocked gases during thermal cycling
Promotes higher system throughput and improved yield
Allows constant pressure and temperature equalization

Vent Configurations

• Single axial vent (standard)
• Cross-drilled vent
• Stepped vent diameter
• Head-side vent exit
• Thread-root vent ports

Vent sizes: 0.3mm to 5mm diameter, precision drilled or EDM machined.

International Standards & Global Designations for Alloy 330

Our Alloy 330 Vented Screws 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 vented screws 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, critical for vented screws in cyclic heating/cooling vacuum environments.

Complete Mechanical Properties – Alloy 330 Vented Screws (Solution Annealed)

All vented screws 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 Vented Screws

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 Vented Screws

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. The vent hole does not compromise corrosion resistance when properly deburred and passivated.

Precision Manufacturing & Global Standards Compliance

Precision Vent Drilling & Heat Treatment

Our Alloy 330 vented screws are CNC machined from solution-annealed bar stock. Vent holes are precision drilled or EDM-machined to exact diameters with controlled depth and concentricity. Each lot undergoes solution annealing (1038‑1066°C) and water quenching to guarantee optimum high‑temperature properties. Deburring and passivation ensure no contamination in vacuum applications.

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 vent designs welcome.

Alloy 330 Vented Screws – Typical Applications & Industries

Our Alloy 330 vented screws are widely used in demanding high‑vacuum and high‑temperature assemblies where trapped gases must be eliminated:

Vacuum furnace hot zones (HV & UHV)
Heat treating baskets & fixtures
Radiant tube supports
Annealing covers & muffles
Gas turbine components
Petrochemical heater hangers
Cracked ammonia handling equipment
Salt bath furnace electrodes
Ceramic fiber module attachments
Semiconductor processing equipment
Particle accelerator components
Space simulation chambers

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

Why RAYCHIN LIMITED – The Alloy 330 Vented Screw Authority

Metallurgical expertise

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

Global approvals & inventory

ISO 9001:2015, AS9100D. Extensive stock of inch & metric sizes, common vent diameters. Fast turnaround for prototypes and emergency shutdowns.

Custom venting capabilities

Special vent depths, cross-drilled holes, multiple vent ports, non-standard lengths, and custom head configurations. High‑temperature anti‑seize coatings available for vacuum applications.

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 Vented Screws – 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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