17-4 PH Vented Screws
17-4PH vented screws are ideal for use in high vacuum (UV) and ultra high vacuum (UHV) equipment, as well as other high pressure environments and applications where gas pockets can form. Center vented screws have a center bore drilled through their axis from the head through the threaded shank of the screw. This feature provides an outlet for the complete evacuation of trapped air and gas contaminants to be pumped away from blind-tapped screw holes, bottoms, sides and shoulders. In addition to vented screws, washers with vent grooves can be made to ensure the venting of the cavity found under the screw head.
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 extremely strong precipitation hardened stainless steel
· Well suited for high strength applciaitons
· Up to 4x stronger than 316 stainless steel
· Maintains its mechanical strength up to 600°F
· 17-4PH Chemistry & Specifications
· 17-4PH vented screw features and benefits
· 17-4PH Datasheet
Request a Quote from RAYCHIN
We're here to help!
17-4 PH Vented Screws: Center Vented Screws for HV/UHV Vacuum Systems & Custom Configurations
RAYCHIN LIMITED is a recognized expert in 17-4 PH vented screws — from 17-4 PH center vented screws, 17-4 PH vacuum vented screws, 17-4 PH socket head vented screws, 17-4 PH hex head vented screws to custom non-standard vented screw configurations. Our portfolio includes vented screws manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for high vacuum (HV) and ultra-high vacuum (UHV) equipment, semiconductor manufacturing, aerospace systems, and medical devices where virtual leaks must be eliminated and pressure equalization is critical. 17-4 PH vented screws feature precision-drilled center bores through the head and threaded shank, ensuring complete evacuation of trapped gases and faster pump-down times. Available in all heat treatment conditions with full traceability.
Complete Range of 17-4 PH Vented Screws
Center Vented Screws – Socket Head
17-4 PH center vented socket head cap screws featuring a precision-drilled axial bore from the head through the threaded shank. Manufactured to DIN 912 / ISO 4762 with venting modification. Ideal for high vacuum and ultra-high vacuum applications where trapped gases must be evacuated from blind tapped holes. Available in sizes from #2 to 1" (M2 to M24) with custom vent diameters. Eliminates virtual leaks and enables faster pump-down times.
Center Vented Screws – Hex Head
17-4 PH center vented hex head cap screws with precision axial vent hole. Manufactured to DIN 931 / DIN 933 and ISO 4014 / ISO 4017 with venting modification. Designed for high-pressure and vacuum applications requiring external wrenching. The center bore provides an outlet for trapped air and gas contaminants to be pumped away from blind holes, bottoms, sides, and shoulders. Ideal for semiconductor equipment, research chambers, and aerospace systems.
Vented Washers & Venting Systems
Complementary 17-4 PH vented washers featuring two bored canals on opposite sides of the flat face. These washers provide an escape route for gases trapped beneath the screw head or between mating surfaces. When used with 17-4 PH vented screws, they ensure complete venting of all cavities in vacuum systems. Available in all standard washer sizes with custom vent configurations.
Aerospace & Semiconductor Vented Screws
17-4 PH vented screws manufactured to NAS, MS, and semiconductor industry specifications. Designed for critical applications in wafer processing equipment, vacuum chambers, satellite systems, and scientific instrumentation. Available with UNJF-3A threads per MIL-S-8879 and custom vent diameters. Full traceability with material certification and third-party testing available.
Custom Vented Screws & Special Configurations
Need a special head style, unusual thread combination, or custom vent diameter? RAYCHIN engineers work with you to produce custom 17-4 PH vented screws to your drawing. Options include cross-drilled vents, multiple vent holes, and specialized vent geometries. Expert heat treatment (H900 through H1150D) precisely controlled for each batch. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS standards.
Virtual Leak Elimination Technology
Our 17-4 PH vented screws are specifically engineered to eliminate virtual leaks in high vacuum systems. The center bore provides a means to vent contaminants found in screw voids, promotes higher system throughput and improved yield, allows for constant pressure and temperature equalization, and relieves pressure from blocked gases. Ideal for research laboratories, particle accelerators, and semiconductor fabs.
Key Benefits of 17-4 PH Vented Screws
Faster Pump-Down
Enables faster, more efficient pump-down of HV and UHV systems by providing escape routes for trapped gases.
Virtual Leak Elimination
Eliminates virtual leaks by venting gases trapped in blind-tapped holes, bottoms, sides, and shoulders.
Pressure Equalization
Allows for constant pressure and temperature equalization across vacuum system components.
Improved Yield
Promotes higher system throughput and improved yield in semiconductor and research applications.
Manufacturing Standards for 17-4 PH Vented Screws
RAYCHIN LIMITED manufactures 17-4 PH vented screws to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.
International Standards & Global Designations for 17-4 PH Vented Screws
To serve clients worldwide, RAYCHIN LIMITED manufactures 17-4 PH vented screws from material conforming to the following national and international specifications. This ensures full compliance for projects in the Americas, Europe, Asia, and the Middle East.
ASTM A564 GR.630 ASTM A193 GR.630 ASTM F593 GR.630 AMS 5643 1.4542 SUS630 UNS S17400 NACE MR0175 17-4PH
Chemical Composition (Weight %) – 17-4 PH Precipitation Hardening Stainless Steel
Our 17-4 PH vented screws are produced from melts that strictly conform to the limits below per ASTM A564 / AMS 5604. The precise addition of copper and niobium enables age-hardening to achieve high strength.
Expert note: The Nb/Cu ratio ensures consistent precipitation of coherent copper-rich clusters during aging. This yields tensile strengths up to 190 ksi (1310 MPa) in the H900 condition while retaining good ductility. 17-4 PH is up to 4x stronger than 316 stainless steel and 2.5x stronger than Duplex 2205. All raw material is positively identified by PMI (Positive Material Identification) and certified with mill test reports.
Complete Mechanical Properties of 17-4 PH Vented Screws (by Heat Treatment per ASTM A564/A564M)
17-4 PH vented screws are available in eight standard heat treatment conditions. RAYCHIN LIMITED recommends the appropriate temper based on your strength vs. toughness requirements. The data below represent minimum values for the material (longitudinal direction) per ASTM A564/A564M Table 3.
Condition H900 (480°C / 900°F) – Highest Strength
Condition H925 (495°C / 925°F) – Slightly lower strength, improved toughness
Condition H1025 (550°C / 1025°F) – Best combination of strength & toughness
Condition H1075 (580°C / 1075°F) – Improved ductility
Condition H1100 (595°C / 1100°F) – Enhanced toughness
Condition H1150 (620°C / 1150°F) – Maximum stress corrosion resistance
Condition H1150M (760°C + 620°C / 1400°F + 1150°F) – Double aged, maximum ductility (NACE MR0175 approved)
Condition H1150D (620°C + 620°C / 1150°F + 1150°F) – Double aged, improved properties
Additionally, 17-4 PH vented screws exhibit excellent fracture toughness and very high fatigue strength. Our test certificates include actual values from each production lot. For sour service (NACE MR0175), H1150M or H1150D conditions are recommended for optimal sulfide stress corrosion cracking resistance.
High Temperature Performance of 17-4 PH Vented Screws
17-4 PH stainless steel maintains its mechanical strength up to 600°F (316°C), making it ideal for high-temperature vacuum applications. For continuous service, maximum operating temperature is approximately 300-400°C depending on condition.
Temperature-Dependent Strength Retention (Condition H900)
The yield strength of 17-4 PH decreases with increasing temperature, with thermal softening becoming significant above 400°C. Suitable for cryogenic to 300°C (572°F) continuous service; higher temperatures may reduce hardness.
Thermal Stability Limits
Corrosion Resistance of 17-4 PH Vented Screws
17-4 PH stainless steel offers excellent corrosion resistance comparable to 304 stainless steel in many environments, attributed to its high chromium content (15-17.5%) which forms a protective Cr₂O₃ passive layer. The corrosion behavior is significantly influenced by heat treatment condition and aging parameters.
Corrosion Performance in Different Environments
Effect of Heat Treatment on Corrosion Resistance
Critical Corrosion Considerations for Vented Screws
- Sensitization: Aging above 495°C can cause chromium carbide precipitation at grain boundaries, leading to chromium depletion and increased susceptibility to intergranular corrosion. However, 17-4 PH is generally less susceptible to sensitization than conventional martensitic grades due to low carbon content.
- Stress Corrosion Cracking (SCC): For environments with risk of SCC, use higher aging temperatures (H1150, H1150M, H1150D) which are approved per NACE MR0175.
- Optimal Aging: Solution treatment at 1040°C followed by aging at 480°C for 4 hours provides the best combination of hardness and corrosion resistance.
- Comparison to 304: 17-4 PH offers comparable corrosion resistance to 304 stainless steel in many environments, with significantly higher strength (up to 4x stronger than 316).
- NACE MR0175 Compliance: For sour service applications, only H1150M and H1150D conditions are permitted with maximum hardness of 28 HRC.
Corrosion Engineering Note: For critical applications in aggressive environments, RAYCHIN LIMITED can provide passivation, specialized coatings (Xylan, PTFE, silver plating), or recommend optimal heat treatment conditions (H1150, H1150M for maximum stress corrosion cracking resistance). Third-party corrosion testing per ASTM G31, G48, or G61 available upon request. NACE MR0175 compliant vented screws available in H1150M and H1150D conditions.
Special focus: 17-4 PH Vented Screws for HV & UHV Applications
For critical applications in high vacuum and ultra-high vacuum environments, RAYCHIN offers 17-4 PH vented screws manufactured to NAS, MS, DIN, ISO, and customer-specific specifications. Our capabilities include:
- Vacuum Applications: Semiconductor wafer processing equipment, particle accelerators, research chambers, satellite systems, mass spectrometers, electron microscopes
- Vent Configurations: Center axial vent holes (standard), cross-drilled vents, multiple vent holes, custom vent diameters from 0.5mm to 6mm
- Head Styles: Socket head cap screws (DIN 912/ISO 4762), hex head cap screws (DIN 931/933), button head, flat head
- Surface Treatments: Electropolishing for reduced outgassing, passivation per ASTM A967, vacuum-compatible lubricants
- Special Processing: Ultrasonic cleaning, Class 100 cleanroom packaging, helium leak testing
- High Temperature: Continuous service up to 300°C (572°F) with retained mechanical properties
- Custom: Special vent geometries, non-standard lengths, and unique head configurations per customer drawings
All 17-4 PH vented screws are supplied in conditions H900 through H1150D, with full traceability and third-party NDT upon request.
Why RAYCHIN LIMITED – The 17-4 PH Vented Screw Authority
Metallurgical competence
Engineers on staff with deep expertise in precipitation hardening. We control aging parameters to ±5°C for consistent mechanical properties across all 17-4 PH vented screws. Every heat is verified by in-house testing.
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.
Precision vent drilling
In-house precision drilling capabilities ensure concentric vent holes with tight tolerances (±0.05mm). Deep hole drilling available for lengths up to 200mm. 100% inspection of vent hole diameter and position.
Custom solutions
Need a special vent configuration, unusual head style, or custom material certification? Our CNC turning and drilling departments handle short runs with agility. We also provide specialized coatings and vacuum compatibility testing per customer requirements.
Contact the 17-4 PH vented screw experts today
Request a quote for 17-4 PH center vented screws, socket head vented screws, hex head vented screws, vented washers & custom configurations – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any condition, any quantity. Inquire about high temperature, vacuum, or NACE MR0175 sour service applications.
sales@ray-chin.com | +86 534 2166 566Our team speaks English, German, Mandarin, and Japanese – ready for your global procurement.
Request A Quote! We'll respond as soon as possible(within 12 hours)
![17-4 PH Fasteners]( "17-4 PH Fasteners")
17-4 PH Fasteners![17-4 PH Bolts]( "17-4 PH Bolts")
17-4 PH Bolts![17-4 PH Nuts]( "17-4 PH Nuts")
17-4 PH Nuts![17-4 PH Screws]( "17-4 PH Screws")
17-4 PH Screws![17-4 PH Washers]( "17-4 PH Washers")
17-4 PH Washers![17-4 PH Studs]( "17-4 PH Studs")
17-4 PH Studs![17-4 PH Hex Bolts]( "17-4 PH Hex Bolts")
17-4 PH Hex Bolts![17-4 PH Shoulder Bolts]( "17-4 PH Shoulder Bolts")
17-4 PH Shoulder Bolts![17-4 PH 12 Point Screws]( "17-4 PH 12 Point Screws")
17-4 PH 12 Point Screws![17-4 PH Lock Nuts]( "17-4 PH Lock Nuts")
17-4 PH Lock Nuts![17-4 PH Hex Cap Screws]( "17-4 PH Hex Cap Screws")
17-4 PH Hex Cap Screws![17-4 PH Set Screws]( "17-4 PH Set Screws")
17-4 PH Set Screws![17-4 PH Socket Head Cap Screws]( "17-4 PH Socket Head Cap Screws")
17-4 PH Socket Head Cap Screws![17-4 PH Vented Screws]( "17-4 PH Vented Screws")
17-4 PH Vented Screws![17-4 PH Torx Screws]( "17-4 PH Torx Screws")
17-4 PH Torx Screws![17-4 PH Pan Head Screws]( "17-4 PH Pan Head Screws")
17-4 PH Pan Head Screws![17-4 PH Flat Head Screws]( "17-4 PH Flat Head Screws")
17-4 PH Flat Head Screws![17-4 PH Button Head Cap Screws]( "17-4 PH Button Head Cap Screws")
17-4 PH Button Head Cap Screws
Get a Quote