Vented Screws / Vacuum Screws surface treatment :Special Chemical Polish

These screws are suitable for use in vacuum chambers.

They efficiently discharge gas accumulated in screw holes or drilled holes, achieving stability in vacuum levels and high vacuum.
The gas vent holes in NBK's vacuum equipment screws are processed in a way that minimally affects the metal structure, reducing the risk
of brittle fracture during use and the generation of outgassing in vacuum environments.
Vacuum_1en

Selection Conditions

Select surface treatmentSpecial Chemical Polish

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Part Name	Vented Socket Head Cap Screws - Chemical Polish	Washers with Vent Groove - Chemical Polish	Vented High Strength Stainless Steel Socket Head Cap Screws – Specialized Chemical Polishing	Vented Socket Head Cap Screws with Captive Wahsers - Chemical Polish	Vented Flanged Socket Head Cap Screws – Specialized Chemical Polishing	Vented Socket Head Cap Screws - Titanium	Vented Socket Head Cap Screws with Ultra Low Profile - Titanium	Vented Socket Head Cap Screws with Small Head - Titanium	Vented Socket Head Cap Screws with Ultra Low Profile & Small Head - Titanium
Part Number	SVSS-PC	SWAS-VF-PC	SVSLG-PC	SVSI1S-PC	SVFSS-PC	SVST	SVSHT	SVST-SD	SVSHT-SD
Feature	Low Outgas	Low outgas	High Strength (Strength Class 10.8 Equivalent)	Captive Washers I=1	With Flange Low Outgas	Lightweight Nonmagnetic Chemical Resistance	Lightweight Sapce-Saving Ultra Low Profile Nonmagnetic Chemical Resistance	Small Head Lightweight Non-magnetic Chemical Resistance Lightweight	Special Low Profile Small Head Space-saving Lightweight Non-magnetic Chemical Resistance Lightweight
Material	SUSXM7 (Equivalent to SUS304)	SUS304	SUS316L	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	Grade 2 Titanium	Grade 2 Titanium	Grade 2 Titanium	Grade 2 Titanium
Surface Treatment	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing
Thread Size	M3 ～ M12	M3 ～ M12	M3 ～ M6	M3 ～ M6	M4 ～ M8	M3 ～ M5	M3 ～ M6	M3 ～ M5	M3 ～ M6
Operating Temperature (℃)	-	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	SVSS-M10-PC SVSS-M12-PC SVSS-M3-PC SVSS-M4-PC SVSS-M5-PC SVSS-M6-PC SVSS-M8-PC	SWAS-10-VF-PC SWAS-12-VF-PC SWAS-3-VF-PC SWAS-4-VF-PC SWAS-5-VF-PC SWAS-6-VF-PC SWAS-8-VF-PC	SVSLG-M3-PC SVSLG-M4-PC SVSLG-M5-PC SVSLG-M6-PC	SVSI1S-M3-PC SVSI1S-M4-PC SVSI1S-M5-PC SVSI1S-M6-PC	SVFSS-M4-PC SVFSS-M5-PC SVFSS-M6-PC SVFSS-M8-PC	SVST-M3 SVST-M4 SVST-M5	SVSHT-M3 SVSHT-M4 SVSHT-M5 SVSHT-M6	SVST-M3-SD SVST-M4-SD SVST-M5-SD	SVSHT-M3-SD SVSHT-M4-SD SVSHT-M5-SD SVSHT-M6-SD

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Part Name	Vented Cross Recessed Flat Head Machine Screws - Titanium	Vented Cross Recessed Pand Head Machine Screws - Titanium	Socket Head Cap Screws - Specialized Chemical Polishing	Flanged Socket Head Cap Screws - Specialized Chemical Polishing	Socket Head Cap Screws - 316L Stainless Steel - Specialized Chemical Polishing	High Strength Stainless Steel Socket Head Cap Screws - Specialized Chemical Polishing	Titanium Hex Socket Head Cap Screws with Captive Washers	Titanium Hex Socket Head Cap Screws with Captive Washers
Part Number	SVFT	SVPT	SNSS-PC	SFSS-PC	SNSL-PC	SNSLG-PC	SNSI1T	SNSI3T
Feature	Titanium Phillips Cross Recessed Flat Head Machine Screw Low outgas Nonmagnetic	Titanium Phillips Cross Recessed Pan Head Machine Screw Low outgas Nonmagnetic	Low Outgas	Flanged Low Outgas	Heat Resistance Corrosion Resistance Non-magnetic Low Outgas	High Strength (Strength Class 10.8 Equivalent) Low Outgas Non-magnetic	Captive Washers I=1	Captive Washers I=3
Material	Grade 2 Titanium	Grade 2 Titanium	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUS316L	SUS316L	Grade 2 Titanium	Grade 2 Titanium
Surface Treatment	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing	Special Chemical Polishing
Thread Size	M3 ～ M4	M3 ～ M5	M3 ～ M8	M4 ～ M8	M3 ～ M8	M3 ～ M6	M3 ～ M6	M3 ～ M6
Operating Temperature (℃)	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	SVFT-M3 SVFT-M4	SVPT-M3 SVPT-M4 SVPT-M5	SNSS-M3-PC SNSS-M4-PC SNSS-M5-PC SNSS-M6-PC SNSS-M8-PC	SFSS-M4-PC SFSS-M5-PC SFSS-M6-PC SFSS-M8-PC	SNSL-M3-PC SNSL-M4-PC SNSL-M5-PC SNSL-M6-PC SNSL-M8-PC	SNSLG-M3-PC SNSLG-M4-PC SNSLG-M5-PC SNSLG-M6-PC	SNSI1T-M3 SNSI1T-M4 SNSI1T-M5 SNSI1T-M6	SNSI3T-M3 SNSI3T-M4 SNSI3T-M5 SNSI3T-M6

Latest

No. 2: Vacuum environments

Vacuum technology is often used in semiconductor manufacturing equipment. A vacuum is not required for all equipment. A vacuum would mainly be required for equipment that uses plasma or an electron beam. In Part 2, we introduce some NBK products that are ideal for use in these vacuum environments!

Description of Tamper Resistant Screws for the Engineers

This is the page on tamper-resistant screws in "Description of Special Screws for Designers." We introduce here what tamper-resistant screws are, the advantages of their use, various usage examples, and their types and characteristics.

Galling and Seizing

This is a phenomenon that occurs while tightening, where the surface of the screw thread melts or welds due to frictional heat and the screw stops moving. To resolve galling, NBK's special surface treatment screws, such as those with fluorine coating, are recommended.

Micro Screws: M0.6 (S0.6) to M2.6 Lineup

NBK offers a wide-ranging lineup of small-diameter screws in various shapes and materials.
Various head diameters and heights are available for the same screw diameters, contributing to saving space.

Helpful Resources

Click here to see Special Screws

Screws compatible with clean environments

Low Profile Screws / Small Head Screws

High Performance Stainless Steel Screws

Titanium Screws

Special Material Screws

Tools

Screws with Special Surface Treatment

Micro Screws

Captive Screws / Full Thread Screws

Quick Release Fasteners

Functional Screws

UNC Screws / UNF Screws

Security screws / Tamper Resistant Screws

Hexalobular Screws

Plugs

Washers / Inserts

Plastic Screws

Vibration Resistance

Screw Caps / Screw Covers

Chemical Resistance Screws

Socket Head Cap Screws

Hex Head Screws

Sheet Metal Fasteners

Vacuum

Low Outgassing

Cleanroom

Chemical Resistance

High Strength

High Specific Strength

Heat Resistance

Galling & Seizing Prevention

Prevention of Screw Drive Damage

Anti-Reflective

Electrical Insulation

Non-Magnetic

Lightweight

Compact and Space-Saving

Increased Productivity

Captive

Loosening Prevention

Decoration

Fixing and Positioning

Conveyance

SEMS Screws / Improved Fastening Efficiency Screws

Recommended Items for You

Select characteristics/function

Vacuum LowOutgas Cleanroom Specification Space Chemical-proof High strength High Specific Strength Heat-resistance Seizing & Sticking Prevention Antireflection Electrical Insulation Electric conducting Nonmagnetic Light Weight Easy to Use Loss Prevention Decoration Fixing/Positioning

Select Thread Size (Metric thread)

M2 M2.5 M2.6 M3 M4 M5 M6 M8 M10 M12 M16

Select Thread Size (Inch thread)

No.4-40UNC No.5-40UNC No.6-32UNC No.8-32UNC No.10-32UNF No.10-24UNC 1/4-20UNC

Select screw length（mm）

3 4 5 6 8 8.6 10 10.8 11.2 12 12.6 13.2 14 15 16 16.8 17.7 18 20 20.6 20.8 21.2 21.7 22 25 25.8 26.2 26.7 30 31.2 35 36.7 40 45 50 60 70 80 90 100 120 150

Select screw length（inch）

1" 1/2" 1/4" 1-1/2" 1-1/4" 1-3/4" 2" 3/16" 3/4" 3/8" 5/16" 5/8" 7/8"

Select material

Stainless Steel SUS304 Equivalent to SUS304 SUSXM7 (Equivalent to SUS304) SUS316L HiMo SUS316L Aluminum A5056 Titanium Grade 2 Titanium Nickel Alloy Inconel equiv. Hastelloy equiv. Molybdenum Pure Molybdenum Ceramic Al2O3 (Alumina 99.5%) Plastic PTFE (Polytetrafluoroethylene)

Stainless Steel

SUS304 Equivalent to SUS304 SUSXM7 (Equivalent to SUS304) SUS316L HiMo SUS316L

Aluminum

A5056

Titanium

Grade 2 Titanium

Nickel Alloy

Inconel equiv. Hastelloy equiv.

Molybdenum

Pure Molybdenum

Ceramic

Al2O3 (Alumina 99.5%)

Plastic

PTFE (Polytetrafluoroethylene)

Select thread/components

Bolts/Machine Screws Washer Setscrew Clamping Bolts/Screws Hexagon Posts Cover Caps

Select head shape

Cap Pan Flat Hexagon Low Profile Special Low Profile Small Head No

Select drive shape

Hex Sockets Cross-recessed sockets No

Select processing

With Through Hole With Relief Cut With Built-in Washer With Groove

Select surface treatment

Surface hardening treatment Stainless Steel Black Silver plating Low temperature black chrome treatment Molybdenum Disulfide Shot Treatment

Select coarse/fine

Coarse Fine