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Special Screws Thread Size (Inch thread) :1/4-20UNC

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Vented Screws / Vacuum Screws

Screws have gas ventilation holes for vacuum drawing of machines and have excellent corrosion resistance under vacuum environments.

Screws compatible with clean environments

Screws with cleanroom washing/cleanroom packing provided are available, along with screws compatible with clean environments such as those with ventilation holes.

Low Profile Screws / Small Head Screws

Compact head screws. Suitable for reducing the size of applications.

High Performance Stainless Steel Screws

High performance stainless steel screws have excellent strength, heat resistance, and corrosion resistance compared to standard stainless steel screws.

Titanium Screws

Screws made of titanium. They are lightweight, nonmagnetic, and chemically resistant.

Special Material Screws

Screws made of special materials such as Inconel, Molybdenum and Hastelloy to provide excellent heat, chemical, corrosion resistance.

Tools

A tool series dedicated for special applications.

Screws with Special Surface Treatment

Screws with surface treatment for seizing prevention and reflection resistance.

Micro Screws

Small-diameter screws lower than M2.6 size for precision instruments.

Captive Screws / Full Thread Screws

Screws for falling-out preventation and screws with full thread.

Quick Release Fasteners

Components that allow easy fixture installation and removal without tools.

Functional Screws

Screws for fixing and locating clamping screws and ball plungers.

UNC Screws / UNF Screws

Screws for equipment and facilities that use inch-screw specifications.

Security screws / Tamper Resistant Screws

Screws which cannot be installed or removed easily with standard tools to prevent theft and tampering.

Hexalobular Screws

Screws with strength socket heads. For repeating installations and removals.

Plugs

Screw plugs for hydraulic and pneumatic machinery and equipment. Washers for loosening prevention.

Washers / Inserts

Washers and inserts are available with a wide variety of outside diameters and thicknesses.

Plastic Screws

Various types of plastic screws made from materials such as VESPEL®, PEEK, and PTFE (Polytetrafluoroethylene).

Vibration Resistance

These screw components are highly effective for prevention of screw loosening due to vibration etc.

Screw Caps / Screw Covers

Protective caps for screw heads and tips.

Chemical Resistance Screws

Screws with special materials, surface treatments, and shapes for applications that require chemical resistance.

Socket Head Cap Screws

We have Socket Head Cap Screws with various kind of materials, surface treatments and characteristics.

Hex Head Screws

We have Hex Head Screws with various kind of materials, surface treatments and characteristics.

Sheet Metal Fasteners

Available to fix thin plate thickness over 0.1mm

SEMS Screws / Improved Fastening Efficiency Screws

Screws that do not require washers. This eliminates the need to incorporate washers and contributes to improved work efficiency.

Select a product from application

Purposes of use

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
Selection Conditions
  • Select Thread Size (Inch thread)1/4-20UNC
Image Vented Inch Socket Head Cap Screws Socket Head Cap Screws with Small Head (Inch Thread) Plastic Screw - Hex Socket Head Cap Screw - Inch Thread - PEEK Plastic Screw - Hex Head Screw - Inch Thread - PEEK Plastic Screw - Cross Recessed Pan Head Machine Screw - PEEK - Inch Thread Socket Head Cap Captive Screws (Inch Screws) Hex Socket Head Cap Screws - Inch Thread Socket Button Head Cap Screws - Inch Thread Hex Nut for Inch Screw
Part Name Vented Inch Socket Head Cap Screws Socket Head Cap Screws with Small Head (Inch Thread) Plastic Screw - Hex Socket Head Cap Screw - Inch Thread - PEEK Plastic Screw - Hex Head Screw - Inch Thread - PEEK Plastic Screw - Cross Recessed Pan Head Machine Screw - PEEK - Inch Thread Socket Head Cap Captive Screws (Inch Screws) Hex Socket Head Cap Screws - Inch Thread Socket Button Head Cap Screws - Inch Thread Hex Nut for Inch Screw
Part Number SVSS-1/4-20 SNSS-1/4-20-SD SPE-1/4-20-C SPE-1/4-20-H SPE-1/4-20 SSC-1/4-20 SNSS-1/4-20 SNBS-1/4-20 SHNS-1/4-20
Feature Inch Thread
Socket Head Cap Screws		 Small Head
Small Space		 Chemical Resistance Chemical Resistance
Heat Resistance		 Heat Resistance
Chemical Resistance		 Inch Thread
Captive /
Loss Prevention		 Inch Thread Inch Thread
Button Head CapScrews		 For Inch Screws
Material Equivalent to SUS304 SUSXM7 (Equivalent to SUS304) PEEK PEEK PEEK SUSXM7 (Equivalent to SUS304) SUSXM7 (Equivalent to SUS304) Equivalent to SUS304 Equivalent to SUS304
Surface Treatment - - - - - - - - -
Thread Size 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC
CAD CAD CAD CAD CAD CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications
List SVSS-1/4-20-1 SVSS-1/4-20-1/2 SVSS-1/4-20-1/4 SVSS-1/4-20-1-1/2 SVSS-1/4-20-1-1/4 SVSS-1/4-20-1-3/4 SVSS-1/4-20-2 SVSS-1/4-20-3/4 SVSS-1/4-20-3/8 SVSS-1/4-20-5/16 SVSS-1/4-20-5/8 SVSS-1/4-20-7/8 SNSS-1/4-20-1 1/4-SD SNSS-1/4-20-1/2-SD SNSS-1/4-20-1/4-SD SNSS-1/4-20-1-SD SNSS-1/4-20-3/4-SD SNSS-1/4-20-3/8-SD SNSS-1/4-20-5/16-SD SNSS-1/4-20-5/8-SD SNSS-1/4-20-7/8-SD SPE-1/4-20-1 1/4-C SPE-1/4-20-1/2-C SPE-1/4-20-1-C SPE-1/4-20-3/4-C SPE-1/4-20-3/8-C SPE-1/4-20-5/8-C SPE-1/4-20-7/8-C SPE-1/4-20-1 1/4-H SPE-1/4-20-1/2-H SPE-1/4-20-1-H SPE-1/4-20-3/4-H SPE-1/4-20-3/8-H SPE-1/4-20-5/8-H SPE-1/4-20-7/8-H SPE-1/4-20-1 1/4-P SPE-1/4-20-1/2-P SPE-1/4-20-1-P SPE-1/4-20-3/4-P SPE-1/4-20-3/8-P SPE-1/4-20-5/8-P SPE-1/4-20-7/8-P SSC-1/4-20-1 SSC-1/4-20-1 1/4 SSC-1/4-20-3/4 SSC-1/4-20-5/8 SSC-1/4-20-7/8 SNSS-1/4-20-1 SNSS-1/4-20-1 1/2 SNSS-1/4-20-1 1/4 SNSS-1/4-20-1 3/4 SNSS-1/4-20-1/2 SNSS-1/4-20-1/4 SNSS-1/4-20-2 SNSS-1/4-20-3/4 SNSS-1/4-20-3/8 SNSS-1/4-20-5/16 SNSS-1/4-20-5/8 SNSS-1/4-20-7/8 SNBS-1/4-20-1 SNBS-1/4-20-1/2 SNBS-1/4-20-3/4 SNBS-1/4-20-3/8 SNBS-1/4-20-5/8 SNBS-1/4-20-7/8 SHNS-1/4-20
Image Flat Washer for Inch Screw Spring Washer for Inch Screw Clamping Bolts - Full Ball (Inch Thread) Clamping Bolts - Full Ball (Inch Thread) Clamping Bolts - Full Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Bolts - Full Ball (Inch Thread)
Part Name Flat Washer for Inch Screw Spring Washer for Inch Screw Clamping Bolts - Full Ball (Inch Thread) Clamping Bolts - Full Ball (Inch Thread) Clamping Bolts - Full Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Bolts - Full Ball (Inch Thread)
Part Number SWAS-1/4-IF SWAS-1/4-IS SCB-1/4-20-5/8-R SCB-1/4-20-3/4-R SCB-1/4-20-1 1/4-R SCB-1/4-20-5/8-F SCB-1/4-20-3/4-F SCB-1/4-20-1 1/4-F SCBS-1/4-20-5/8-R
Feature For Inch Screws For Inch Screws Full Ball Type
Inch Thread		 Full Ball Type
Inch Thread		 Full Ball Type
Inch Thread		 Flat Ball Type
Inch Thread		 Flat Ball Type
Inch Thread		 Flat Ball Type
Inch Thread		 Full Ball Type
Inch Thread
Material Equivalent to SUS304 Equivalent to SUS304 - - - - - - -
Surface Treatment - - Ferrosoferric Oxide Film (Black) Ferrosoferric Oxide Film (Black) Ferrosoferric Oxide Film (Black) Ferrosoferric Oxide Film (Black) Ferrosoferric Oxide Film (Black) Ferrosoferric Oxide Film (Black) -
Thread Size 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC
CAD CAD CAD CAD CAD CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications
List SWAS-1/4-IF SWAS-1/4-IS SCB-1/4-20-5/8-R SCB-1/4-20-3/4-R SCB-1/4-20-1 1/4-R SCB-1/4-20-5/8-F SCB-1/4-20-3/4-F SCB-1/4-20-1 1/4-F SCBS-1/4-20-5/8-R
Image Clamping Bolts - Full Ball (Inch Thread) Clamping Bolts - Full Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Screws - Full Ball (Inch Thread) Clamping Screws - Full Ball (Inch Thread) Clamping Screws - Full Ball (Inch Thread) Clamping Screws - Full Ball (Inch Thread)
Part Name Clamping Bolts - Full Ball (Inch Thread) Clamping Bolts - Full Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Bolts - Flat Ball (Inch Thread) Clamping Screws - Full Ball (Inch Thread) Clamping Screws - Full Ball (Inch Thread) Clamping Screws - Full Ball (Inch Thread) Clamping Screws - Full Ball (Inch Thread)
Part Number SCBS-1/4-20-3/4-R SCBS-1/4-20-1 1/4-R SCBS-1/4-20-5/8-F SCBS-1/4-20-3/4-F SCBS-1/4-20-1 1/4-F SCS-1/4-20-1/2-R SCS-1/4-20-5/8-R SCSS-1/4-20-1/2-R SCSS-1/4-20-5/8-R
Feature Full Ball Type
Inch Thread		 Full Ball Type
Inch Thread		 Flat Ball Type
Inch Thread		 Flat Ball Type
Inch Thread		 Flat Ball Type
Inch Thread		 Full Ball Type
Inch Thread		 Full Ball Type
Inch Thread		 Full Ball Type
Inch Thread		 Full Ball Type
Inch Thread
Material - - - - - Steel Steel Stainless Steel Stainless Steel
Surface Treatment - - - - - Ferrosoferric Oxide Film (Black) Ferrosoferric Oxide Film (Black) - -
Thread Size 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC 1/4-20UNC - - - -
CAD CAD CAD CAD CAD CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications
List SCBS-1/4-20-3/4-R SCBS-1/4-20-1 1/4-R SCBS-1/4-20-5/8-F SCBS-1/4-20-3/4-F SCBS-1/4-20-1 1/4-F SCS-1/4-20-1/2-R SCS-1/4-20-5/8-R SCSS-1/4-20-1/2-R SCSS-1/4-20-5/8-R
Image Clamping Screws - Flat Ball (Inch Thread) Clamping Screws - Flat Ball (Inch Thread) Clamping Screws - Flat Ball (Inch Thread) Clamping Screws - Flat Ball (Inch Thread)
Part Name Clamping Screws - Flat Ball (Inch Thread) Clamping Screws - Flat Ball (Inch Thread) Clamping Screws - Flat Ball (Inch Thread) Clamping Screws - Flat Ball (Inch Thread)
Part Number SCS-1/4-20-1/2-F SCS-1/4-20-5/8-F SCSS-1/4-20-1/2-F SCSS-1/4-20-5/8-F
Feature Flat Ball Type
Inch Thread		 Flat Ball Type
Inch Thread		 Flat Ball Type
Inch Thread		 Flat Ball Type
Inch Thread
Material Steel Steel Stainless Steel Stainless Steel
Surface Treatment Ferrosoferric Oxide Film (Black) Ferrosoferric Oxide Film (Black) - -
Thread Size - - - -
CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications
List SCS-1/4-20-1/2-F SCS-1/4-20-5/8-F SCSS-1/4-20-1/2-F SCSS-1/4-20-5/8-F

Latest

No. 2: Vacuum environments

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

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

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

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.

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Recommended Items for You

Select Thread Size (Metric thread)

S0.6 S0.8 M1 M1.2 M1.4 M1.6 M1.7 M2 M2.5 M2.6 M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36

Select Thread Size (Inch thread)

No.2-56UNC No.4-40UNC No.5-40UNC No.6-32UNC No.8-32UNC No.10-32UNF No.10-24UNC No.12-24UNC 1/4-28UNF 5/16-18UNC 3/8-16UNC