(!)Due to Microsoft's end of support for Internet Explorer 11 on 15/06/2022, this site does not support the recommended environment.
Instead, please kindly use other browsers like Google Chrome, Microsoft Edge or Mozilla Firefox.

  • Scheduled Maintenance Notice: This site will be unavailable due to scheduled maintenance from 9:00 23/2 to 7:00 (SGT) 24/2/2025. We apologize for the inconvenience.
  • Notice of End of Sales for Economy Series Pneumatic Equipment Category. More information.

Hex Socket Set Screws(Basic Shape:Set Screw)

Hex Socket Set Screws, also known as grub screws or hollow screws, are essential fasteners used in various industrial applications to secure objects within or against another object without protruding. These screws feature a headless design with an internal hexagonal drive, allowing for a flush fit that is ideal for applications requiring a smooth surface. Available in a range of materials including steel, stainless steel, titanium, brass, and aluminum, they are designed to suit different environmental conditions and mechanical requirements. The screws come in multiple tip shapes such as flat tip, cone point, cup point, dog point, and more, each providing unique holding characteristics and suited for specific uses. Surface treatments like black oxide, nickel plating, chrome plating, and trivalent chromate enhance their durability and resistance to corrosion. These versatile screws are commonly used in securing pulleys, collars, and gears to shafts, ensuring reliable performance in machinery and equipment.
Days to Ship
  • All
  • Same day
  • 3 Day(s) or Less
  • 4 Day(s) or Less
  • 5 Day(s) or Less
  • 6 Day(s) or Less
  • 7 Day(s) or Less
  • 8 Day(s) or Less
  • 9 Day(s) or Less
  • 10 Day(s) or Less
  • 11 Day(s) or Less
Brand
Product Series
CAD
Days to Ship
Length L (mm)(mm)
Environmentally friendly
Nominal of Thread (M)
Characteristics/Applications
Tip Shape
Mounting Hole Shape
Basic Shape
Thread Type
Material
Surface Treatment_
Material Details
Nominal of Thread (inch)
Sales Unit
Application
Additional Shape
Length L (inch)(inch)
Strength Class (Stainless Steel)
Pitch(mm)
Cleaning Method
  • Recommendation

Hex Socket Set Screw, Fine

  • Recommendation

Hex Socket Set Screw, Coarse

    Hex Socket Set Screws - Flat End

    • On Sale Till 31/03/2025

    Hex Socket Set Screws - Soft Tips

    • On Sale Till 31/03/2025

    Hex Socket Set Screw Flat Tip

      Hex Socket Set Screws - Flat End, Stainless Steel, Box / Single Item[RoHS Comliant]

        Hex Socket Set Screws - Cup Point, Stainless Steel[RoHS Comliant]

        • On Sale Till 31/03/2025

        Hex Socket Set Screws - Cup Point

        • On Sale Till 31/03/2025

        Hexagon Socket Set Screw, Flat Tip, by Ansco

        • On Sale Till 31/03/2025

        Hex Socket Set Screw Cone Point

        • On Sale Till 31/03/2025

        Hex Socket Set Screw Dog Point

        • On Sale Till 31/03/2025

        Hex Socket Set Screws/Cup Point (Box)

          Hex Socket Set Screw - Cup Point

          • On Sale Till 31/03/2025

          Hex Socket Set Screws/Cone Point

          • On Sale Till 31/03/2025

          Hex Socket Set Screws/Flat End (Box)

          • On Sale Till 31/03/2025

          Hex Socket Set Screw Flat Tip Fine

          • On Sale Till 31/03/2025

          Hexagon Socket Set Screw, Flat Tip, by Hoei Tekko Co., Ltd.

          • On Sale Till 31/03/2025

          Rounded-Tip Hex Socket Set Screw

            Hex Socket Set Screw - Flat End - Stainless Steel

            • On Sale Till 31/03/2025

            Hex Socket Set Screw - Cup Point Fine

              Set Collar, Soft Pad Bolt, Option

                Hexagon Socket Set Screw, Flat Tip, by Tokosha Metal Works Co., Ltd.

                  Hex Socket Set Screw - Cup Point - Stainless Steel

                    Locking Screw, Class 2

                      Hexagon Socket Set Screw, Indented Tip, by Nagai Seimitsu

                      • On Sale Till 31/03/2025

                      Socket Head Cap Screws/with Soft Point

                        Hexagonal Socket Head Set Screw (Black Oxide Finish) (Stainless Steel) (Titanium)

                          Hexagon Socket Set Screw, Serrated Tooth, by Unbrako

                            [Clean & Pack] Hex Socket Set Screw - Cone Point

                            • On Sale Till 31/03/2025

                            Locking Screw, Class 1

                              Air Vent Hex Set Screw with Concave End

                                Hex Socket Set Screw (Hollow Set) (Double Point)

                                  Hex Socket Head Set Screw, Cup Point, Size in Inches

                                    Hex Socket Head Set Screw, Cone Point, Inch Size

                                    • On Sale Till 31/03/2025

                                    Hexagon Socket Set Screw, Indented Tip, by Ansco

                                      [Clean & Pack] Hex Socket Head Cap Screw - Cup Point

                                        Hex Socket Set Screw - Dog Point - Carbon Steel

                                          Hex Socket Set Screw - Flat End - Carbon Steel

                                            Hex Socket Set Screw - Cup Point - Carbon Steel

                                              Hex Socket Set Screw (Hollow Set) (AWP)

                                                Hex Socket Head Set Screw, Extended Point, Inch Size

                                                  [Clean & Pack] Hex Socket Head Cap Screw - Flat End

                                                  • Economy

                                                  Economy Hex Protruding Set Screws Stainless Steel DIN915 (Boxed)

                                                  • Economy

                                                  Economy Sharp Tip Set Screws Stainless Steel DIN914 (Boxed)

                                                    Straight-Slot Head Set Screw, Pointed Tip (Hex Socket Set Screw)

                                                    Brand

                                                    MISUMI

                                                    MiSUMi Economy

                                                    MISUMI

                                                    MiSUMi Economy

                                                    MISUMI

                                                    MISUMI

                                                    SUNCO

                                                    MISUMI

                                                    MiSUMi Economy

                                                    MISUMI

                                                    MiSUMi Economy

                                                    MISUMI

                                                    SUNCO

                                                    SUNCO

                                                    SUNCO

                                                    MISUMI

                                                    SUNCO

                                                    MISUMI

                                                    MISUMI

                                                    SUNCO

                                                    SUNCO

                                                    ALPS SEIKO

                                                    MISUMI

                                                    MiSUMi Economy

                                                    SUNCO

                                                    IWATA MFG

                                                    SUNCO

                                                    MISUMI

                                                    MiSUMi Economy

                                                    SUNCO

                                                    SUNCO

                                                    MISUMI

                                                    TRUSCO NAKAYAMA

                                                    SUNCO

                                                    MISUMI

                                                    SUNCO

                                                    SUNCO

                                                    TOKOSHA K

                                                    SAIMA CORPORATION

                                                    SAIMA CORPORATION

                                                    SUNCO

                                                    MISUMI

                                                    MISUMI

                                                    MiSUMi Economy

                                                    MISUMI

                                                    MiSUMi Economy

                                                    MISUMI

                                                    MiSUMi Economy

                                                    ANSCO

                                                    SAIMA CORPORATION

                                                    MISUMI

                                                    MISUMI

                                                    MiSUMi Economy

                                                    MISUMI

                                                    MiSUMi Economy

                                                    SUNCO

                                                    Product Series

                                                    Hex Socket Set Screw, Fine

                                                    Hex Socket Set Screw, Coarse

                                                    Hex Socket Set Screws - Flat End

                                                    Hex Socket Set Screws - Soft Tips

                                                    Hex Socket Set Screw Flat Tip【1-1,000 Pieces Per Package】

                                                    Hex Socket Set Screws - Flat End, Stainless Steel, Box / Single Item[RoHS Comliant]【1-1,300 Pieces Per Package】

                                                    Hex Socket Set Screws - Cup Point, Stainless Steel[RoHS Comliant]【1-1,000 Pieces Per Package】

                                                    Hex Socket Set Screws - Cup Point

                                                    Hexagon Socket Set Screw, Flat Tip, by Ansco【1-2,000 Pieces Per Package】

                                                    Hex Socket Set Screw Cone Point【1-2,000 Pieces Per Package】

                                                    Hex Socket Set Screw Dog Point【1-1,000 Pieces Per Package】

                                                    Hex Socket Set Screws/Cup Point (Box)【300-1,000 Pieces Per Package】

                                                    Hex Socket Set Screw - Cup Point【1-2,000 Pieces Per Package】

                                                    Hex Socket Set Screws/Cone Point

                                                    Hex Socket Set Screws/Flat End (Box)【200-1,000 Pieces Per Package】

                                                    Hex Socket Set Screw Flat Tip Fine【1-100 Pieces Per Package】

                                                    Hexagon Socket Set Screw, Flat Tip, by Hoei Tekko Co., Ltd.【1-2,000 Pieces Per Package】

                                                    Rounded-Tip Hex Socket Set Screw【1-1,000 Pieces Per Package】

                                                    Hex Socket Set Screw - Flat End - Stainless Steel【60-28,000 Pieces Per Package】

                                                    Hex Socket Set Screw - Cup Point Fine【1-200 Pieces Per Package】

                                                    Set Collar, Soft Pad Bolt, Option

                                                    Hexagon Socket Set Screw, Flat Tip, by Tokosha Metal Works Co., Ltd.【1-1,000 Pieces Per Package】

                                                    Hex Socket Set Screw - Cup Point - Stainless Steel【90-16,000 Pieces Per Package】

                                                    Locking Screw, Class 2【1-100 Pieces Per Package】

                                                    Hexagon Socket Set Screw, Indented Tip, by Nagai Seimitsu【1-1,000 Pieces Per Package】

                                                    Socket Head Cap Screws/with Soft Point

                                                    Hexagonal Socket Head Set Screw (Black Oxide Finish) (Stainless Steel) (Titanium)【2-85 Pieces Per Package】

                                                    Hexagon Socket Set Screw, Serrated Tooth, by Unbrako

                                                    [Clean & Pack] Hex Socket Set Screw - Cone Point

                                                    Locking Screw, Class 1【1-50 Pieces Per Package】

                                                    Air Vent Hex Set Screw with Concave End

                                                    Hex Socket Set Screw (Hollow Set) (Double Point)【1-1,000 Pieces Per Package】

                                                    Hex Socket Head Set Screw, Cup Point, Size in Inches

                                                    Hex Socket Head Set Screw, Cone Point, Inch Size

                                                    Hexagon Socket Set Screw, Indented Tip, by Ansco【1-2,000 Pieces Per Package】

                                                    [Clean & Pack] Hex Socket Head Cap Screw - Cup Point

                                                    Hex Socket Set Screw - Dog Point - Carbon Steel【60-10,000 Pieces Per Package】

                                                    Hex Socket Set Screw - Flat End - Carbon Steel【55-10,000 Pieces Per Package】

                                                    Hex Socket Set Screw - Cup Point - Carbon Steel【100-25,000 Pieces Per Package】

                                                    Hex Socket Set Screw (Hollow Set) (AWP)【1-2,000 Pieces Per Package】

                                                    Hex Socket Head Set Screw, Extended Point, Inch Size

                                                    [Clean & Pack] Hex Socket Head Cap Screw - Flat End

                                                    Economy Hex Protruding Set Screws Stainless Steel DIN915 (Boxed)【380-10,000 Pieces Per Package】

                                                    Economy Sharp Tip Set Screws Stainless Steel DIN914 (Boxed)【100-32,000 Pieces Per Package】

                                                    Straight-Slot Head Set Screw, Pointed Tip (Hex Socket Set Screw)【1-1,000 Pieces Per Package】

                                                    CAD
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    • 2D / 3D
                                                    Days to Ship Same day or more Same day or more Same day or more Same day or more Same day or more 4 Day(s) or more 4 Day(s) or more Same day or more Same day or more Same day or more Same day or more Same day or more Same day or more Same day or more Same day or more 3 Day(s) or more Same day or more Same day or more 11 Day(s) Same day or more 5 Day(s) or more 3 Day(s) or more 11 Day(s) 3 Day(s) or more 3 Day(s) or more Same day or more 3 Day(s) or more 7 Day(s) or more 5 Day(s) or more 3 Day(s) or more Same day or more 3 Day(s) or more 10 Day(s) or more 6 Day(s) or more Same day or more 5 Day(s) or more 13 Day(s) 13 Day(s) 12 Day(s) 3 Day(s) or more 6 Day(s) or more 5 Day(s) or more 13 Day(s) 13 Day(s) 3 Day(s) or more
                                                    Length L (mm)(mm)10 ~ 10010 ~ 1202 ~ 305 ~ 1002 ~ 2003 ~ 53 ~ 152 ~ 302 ~ 602 ~ 1003 ~ 1002 ~ 202 ~ 2002 ~ 302 ~ 306 ~ 602 ~ 303 ~ 503 ~ 803 ~ 605 ~ 162 ~ 853 ~ 806 ~ 202 ~ 1210 ~ 402 ~ 50-2 ~ 158 ~ 146 ~ 402 ~ 30--2 ~ 602 ~ 155 ~ 603 ~ 603 ~ 602.5 ~ 30-2 ~ 304 ~ 353 ~ 801.5 ~ 6
                                                    Environmentally friendly-----------------------------------------RoHS Compliant (10 Substances)---
                                                    Nominal of Thread (M)3 ~ 203 ~ 202 ~ 83 ~ 121.6 ~ 30332 ~ 122 ~ 122 ~ 203 ~ 202 ~ 101.6 ~ 362 ~ 82 ~ 86 ~ 241.6 ~ 63 ~ 122 ~ 163 ~ 243 ~ 102 ~ 202 ~ 1612 ~ 681.6 ~ 53 ~ 82 ~ 12-2 ~ 310 ~ 333 ~ 122 ~ 10--2 ~ 122 ~ 33 ~ 163 ~ 162.5 ~ 122 ~ 10-2 ~ 83 ~ 102.5 ~ 121.2 ~ 2.6
                                                    Characteristics/Applications-----------------------------------------Clean Washed ~ Vacuum---
                                                    Tip ShapeRounded EndRounded EndFlat EndSoft PadFlat EndFlat EndCup PointCup PointFlat EndCone PointDog PointCup PointCup PointCone PointFlat EndFlat EndFlat EndRounded EndFlat EndCup PointMetal PadFlat EndCup PointFlat EndCup PointSoft Pad / Metal PadCup PointOther Special ShapesCone PointOther Special ShapesCup PointOther Special ShapesCup PointCone PointCup PointCup PointDog PointFlat EndCup PointCup PointDog PointFlat EndDog PointCone PointCone Point
                                                    Mounting Hole ShapeHex SocketHex SocketHex SocketHex SocketHex Socket--Hex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex SocketHex Socket-Hex SocketHex SocketHex SocketHex SocketHex SocketHex Socket-Hex SocketHex SocketHex SocketHex SocketHex SocketHex Socket--Straight Slot Groove
                                                    Basic ShapeSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet ScrewSet Screw
                                                    Thread TypeMetric, FineMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, FineMetric, CoarseMetric, CoarseMetric, CoarseMetric, FineMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseUnified, Coarse (UNC)Metric, CoarseMetric, Coarse ~ Metric, FineMetric, CoarseMetric, CoarseUnified, Coarse (UNC) ~ Unified, Fine (UNF)Unified, Coarse (UNC) ~ Unified, Fine (UNF)Metric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseMetric, CoarseUnified, Coarse (UNC) ~ Unified, Fine (UNF)Metric, CoarseMetric, CoarseMetric, CoarseMetric, Coarse
                                                    MaterialSteelSteelStainless Steel ~ SteelStainless Steel ~ SteelStainless Steel ~ SteelStainless SteelStainless SteelStainless Steel ~ SteelStainless Steel ~ SteelStainless Steel ~ SteelStainless Steel ~ SteelStainless Steel ~ SteelStainless Steel ~ TitaniumStainless Steel ~ SteelStainless Steel ~ SteelSteelStainless Steel ~ SteelSteelStainless SteelStainless Steel ~ SteelStainless Steel ~ SteelSteelStainless SteelSteelSteelStainless Steel ~ SteelStainless Steel ~ TitaniumSteelStainless SteelSteelStainless SteelStainless Steel ~ SteelStainless Steel ~ SteelStainless Steel ~ SteelStainless Steel ~ SteelStainless SteelSteelSteelSteelStainless Steel ~ SteelStainless SteelStainless SteelSteelSteelSteel
                                                    Surface Treatment_--Not Provided / Triiron Tetraoxide CoatingNot Provided / Triiron Tetraoxide CoatingTin Plating / Black Paint / Not Provided / Triiron Tetraoxide Coating / Trivalent Chromate / Bright Chrome Plating / Chromate Plating / Nickel Plating / Chrome Plating / DacrotizingNot ProvidedNot ProvidedNot Provided / Triiron Tetraoxide CoatingBlack Paint / Not Provided / Triiron Tetraoxide Coating / Trivalent Chromate / Bright Chrome PlatingTin Plating / Black Paint / Not Provided / Triiron Tetraoxide Coating / Trivalent Chromate / Bright Chrome Plating / Chromate Plating / Nickel Plating / Black Nickel Plating / Chrome Plating / DacrotizingTin Plating / Not Provided / Triiron Tetraoxide Coating / Trivalent Chromate / Bright Chrome Plating / Chromate Plating / Nickel Plating-Tin Plating / Locking Agent Coating / Black Paint / Not Provided / Triiron Tetraoxide Coating / Trivalent Chromate / Bright Chrome Plating / Chromate Plating / Nickel Plating / Chrome Plating / DacrotizingNot Provided / Triiron Tetraoxide Coating-Triiron Tetraoxide Coating / Bright Chrome PlatingNot Provided / Triiron Tetraoxide CoatingTriiron Tetraoxide Coating / Trivalent Chromate / Chromate Plating / Nickel PlatingNot ProvidedNot Provided / Triiron Tetraoxide CoatingNot Provided / Black Nickel PlatingNot Provided / Triiron Tetraoxide Coating / Trivalent Chromate / Bright Chrome Plating / Chromate Plating / Nickel PlatingNot ProvidedTriiron Tetraoxide CoatingNot Provided / Triiron Tetraoxide Coating / Trivalent Chromate / Nickel PlatingNot Provided / Triiron Tetraoxide CoatingTriiron Tetraoxide CoatingTriiron Tetraoxide Coating-Triiron Tetraoxide CoatingNot ProvidedTin Plating / Not Provided / Triiron Tetraoxide Coating / Trivalent Chromate / Bright Chrome Plating / Chromate Plating / Nickel Plating / Chrome PlatingPassivated / Triiron Tetraoxide CoatingPassivated / Triiron Tetraoxide CoatingTin Plating / Locking Agent Coating / Black Paint / Not Provided / Triiron Tetraoxide Coating / Trivalent Chromate / Bright Chrome Plating / Chromate Plating / Nickel Plating / Chrome Plating-Triiron Tetraoxide CoatingTriiron Tetraoxide CoatingTriiron Tetraoxide CoatingNot Provided / Black Oxide FilmPassivated-Not ProvidedNot ProvidedNot Provided / Trivalent Chromate / Chromate Plating / Nickel Plating
                                                    Material Details-----------------------------------------SUS304 Equivalent---
                                                    Nominal of Thread (inch)---------------------------1/4 ~ No. 6----No. 0 ~ No. 101/4 ~ No. 10------1/4 ~ No. 10----
                                                    Sales UnitSold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)-Box, Pkg.Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)Box, Pkg.Box, Pkg. ~ Sold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)Box, Pkg.Box, Pkg. ~ Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)Box, Pkg.Box, Pkg. ~ Sold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)Box, Pkg.Box, Pkg. ~ Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)-Sold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)Box, Pkg. ~ Sold Individually (No Min. Purchase)Sold Individually (No Min. Purchase)Box, Pkg.Box, Pkg.Box, Pkg.Box, Pkg. ~ Sold Individually (No Min. Purchase)Box, Pkg.Sold Individually (No Min. Purchase)Box, Pkg.Box, Pkg.Box, Pkg. ~ Sold Individually (No Min. Purchase)
                                                    Application--StandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandard-StandardStandard-StandardStandardStandard / Chemical Resistance / High Strength / Non-magneticStandardStandard / For Vacuum Equipment / For Clean Environment--StandardStandardStandardStandardStandard / For Vacuum Equipment / For Clean EnvironmentStandardStandardStandardStandardStandardStandard / For Vacuum Equipment / For Clean EnvironmentStandardStandardStandard
                                                    Additional Shape--StandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandardStandard-Standard-Standard-StandardStandardStandard-StandardStandard--Standard--StandardStandardStandard--Standard-StandardStandard-Standard
                                                    Length L (inch)(inch)---------------------------1 1/4 ~ 5/8----1 ~ 7/161 ~ 7/16------1 ~ 5/16----
                                                    Strength Class (Stainless Steel)-----A2-50A2-70-----------A2-70---A2-70---------A2-50A2-50------A2-50----
                                                    Pitch(mm)-----0.5 ~ 1.250.5 ~ 1.75--------0.75 ~ 2-----------------------------
                                                    Cleaning Method-----No CleaningNo Cleaning---------------------Precision Cleaning / Electrolytic Polishing + Precision Cleaning / Degreasing------Precision Cleaning / Electrolytic Polishing + Precision Cleaning / Degreasing-----Precision Cleaning / Electrolytic Polishing + Precision Cleaning / Degreasing---

                                                    Loading...

                                                    Related Categories to Hex Socket Set Screws