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Washers / Inserts

Washers and inserts are available with a wide variety of outside diameters and thicknesses.
Image Adjust Metal Washer - Steel - Ferrosoferric Oxide Film Adjust Metal Washer - Steel - Electroless Nickel Plating Adjust Metal Washer - Stainless Steel Adjust Metal Washer - Stainless Steel Black High Intensity Flat Washers Plain Washers for High Strength Stainless Steel Bolts Washers (Galvanic Corrosion Prevention Treatment) Washer - SUS310S Flat Washer for Inch Screw
Part Name Adjust Metal Washer - Steel - Ferrosoferric Oxide Film Adjust Metal Washer - Steel - Electroless Nickel Plating Adjust Metal Washer - Stainless Steel Adjust Metal Washer - Stainless Steel Black High Intensity Flat Washers Plain Washers for High Strength Stainless Steel Bolts Washers (Galvanic Corrosion Prevention Treatment) Washer - SUS310S Flat Washer for Inch Screw
Part Number SWA-AW SWA-AWEL SWAS-AW SWAS-AWBK SWF SWALG-F SWA-F-GJ SWAJ-F SWAS-IF
Feature Wide Variety Wide Variety Wide Variety Wide Variety
Reflection Resistance Corrosion Resistance		 Vibration Resistant
High Strength		 Heat Resistance
Chemical Resistance		 Galvanic Corrosion Prevention Heat Resistance
Chemical Resistance		 For Inch Screws
Material Steel Steel SUS304 SUS304 Steel SUS316L Steel SUS310S Equivalent to SUS304
Surface Treatment Ferrosoferric Oxide Film (Black) Electroless nickel plating - Stainless Steel Black Ferrosoferric Oxide Film (Black) - Galvanic Corrosion Prevention Treatment - -
Thread Size M2 ～ M20 M2 ～ M20 M2 ～ M20 M3 ～ M16 M6 ～ M16 M3 ～ M6 M5 ～ M16 M3 ～ M10 No.4-40UNC ～ 3/8-16UNC
Operating Temperature (℃) - - - - - - - - -
CAD CAD CAD CAD CAD CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications
List SWA-10-12-AW SWA-10-15-AW SWA-10-16-AW SWA-10-18-AW SWA-10-20-AW SWA-10-25-AW SWA-10-30-AW SWA-10-35-AW SWA-10-40-AW SWA-10-50-AW SWA-12-16-AW SWA-12-18-AW SWA-12-20-AW SWA-12-25-AW SWA-12-30-AW SWA-12-35-AW SWA-12-40-AW SWA-12-50-AW SWA-16-20-AW SWA-16-25-AW SWA-16-30-AW SWA-16-35-AW SWA-16-40-AW SWA-16-50-AW SWA-20-35-AW SWA-20-40-AW SWA-20-50-AW SWA-2-8-AW SWA-3-10-AW SWA-3-12-AW SWA-3-15-AW SWA-3-8-AW SWA-4-10-AW SWA-4-12-AW SWA-4-15-AW SWA-4-16-AW SWA-4-18-AW SWA-4-20-AW SWA-4-25-AW SWA-4-8-AW SWA-5-10-AW SWA-5-12-AW SWA-5-15-AW SWA-5-16-AW SWA-5-18-AW SWA-5-20-AW SWA-5-25-AW SWA-5-8-AW SWA-6-10-AW SWA-6-12-AW SWA-6-15-AW SWA-6-16-AW SWA-6-18-AW SWA-6-20-AW SWA-6-25-AW SWA-6-30-AW SWA-6-8-AW SWA-8-12-AW SWA-8-15-AW SWA-8-16-AW SWA-8-18-AW SWA-8-20-AW SWA-8-25-AW SWA-8-30-AW SWA-10-12-AWEL SWA-10-15-AWEL SWA-10-16-AWEL SWA-10-18-AWEL SWA-10-20-AWEL SWA-10-25-AWEL SWA-10-30-AWEL SWA-10-35-AWEL SWA-10-40-AWEL SWA-10-50-AWEL SWA-12-16-AWEL SWA-12-18-AWEL SWA-12-20-AWEL SWA-12-25-AWEL SWA-12-30-AWEL SWA-12-35-AWEL SWA-12-40-AWEL SWA-12-50-AWEL SWA-16-20-AWEL SWA-16-25-AWEL SWA-16-30-AWEL SWA-16-35-AWEL SWA-16-40-AWEL SWA-16-50-AWEL SWA-20-35-AWEL SWA-20-40-AWEL SWA-20-50-AWEL SWA-2-8-AWEL SWA-3-10-AWEL SWA-3-12-AWEL SWA-3-15-AWEL SWA-3-8-AWEL SWA-4-10-AWEL SWA-4-12-AWEL SWA-4-15-AWEL SWA-4-16-AWEL SWA-4-18-AWEL SWA-4-20-AWEL SWA-4-25-AWEL SWA-4-8-AWEL SWA-5-10-AWEL SWA-5-12-AWEL SWA-5-15-AWEL SWA-5-16-AWEL SWA-5-18-AWEL SWA-5-20-AWEL SWA-5-25-AWEL SWA-5-8-AWEL SWA-6-10-AWEL SWA-6-12-AWEL SWA-6-15-AWEL SWA-6-16-AWEL SWA-6-18-AWEL SWA-6-20-AWEL SWA-6-25-AWEL SWA-6-30-AWEL SWA-6-8-AWEL SWA-8-12-AWEL SWA-8-15-AWEL SWA-8-16-AWEL SWA-8-18-AWEL SWA-8-20-AWEL SWA-8-25-AWEL SWA-8-30-AWEL SWAS-10-12-AW SWAS-10-15-AW SWAS-10-16-AW SWAS-10-18-AW SWAS-10-20-AW SWAS-10-25-AW SWAS-10-30-AW SWAS-10-35-AW SWAS-10-40-AW SWAS-10-50-AW SWAS-12-16-AW SWAS-12-18-AW SWAS-12-20-AW SWAS-12-25-AW SWAS-12-30-AW SWAS-12-35-AW SWAS-12-40-AW SWAS-12-50-AW SWAS-16-20-AW SWAS-16-25-AW SWAS-16-30-AW SWAS-16-35-AW SWAS-16-40-AW SWAS-16-50-AW SWAS-20-35-AW SWAS-20-40-AW SWAS-20-50-AW SWAS-2-8-AW SWAS-3-10-AW SWAS-3-12-AW SWAS-3-15-AW SWAS-3-8-AW SWAS-4-10-AW SWAS-4-12-AW SWAS-4-15-AW SWAS-4-16-AW SWAS-4-18-AW SWAS-4-20-AW SWAS-4-25-AW SWAS-4-8-AW SWAS-5-10-AW SWAS-5-12-AW SWAS-5-15-AW SWAS-5-16-AW SWAS-5-18-AW SWAS-5-20-AW SWAS-5-25-AW SWAS-5-8-AW SWAS-6-10-AW SWAS-6-12-AW SWAS-6-15-AW SWAS-6-16-AW SWAS-6-18-AW SWAS-6-20-AW SWAS-6-25-AW SWAS-6-30-AW SWAS-6-8-AW SWAS-8-12-AW SWAS-8-15-AW SWAS-8-16-AW SWAS-8-18-AW SWAS-8-20-AW SWAS-8-25-AW SWAS-8-30-AW SWAS-10-12-AWBK SWAS-10-16-AWBK SWAS-10-20-AWBK SWAS-10-25-AWBK SWAS-12-16-AWBK SWAS-12-20-AWBK SWAS-12-25-AWBK SWAS-16-25-AWBK SWAS-3-8-AWBK SWAS-4-10-AWBK SWAS-4-12-AWBK SWAS-4-8-AWBK SWAS-5-10-AWBK SWAS-5-12-AWBK SWAS-5-16-AWBK SWAS-5-20-AWBK SWAS-5-8-AWBK SWAS-6-10-AWBK SWAS-6-12-AWBK SWAS-6-16-AWBK SWAS-6-20-AWBK SWAS-6-25-AWBK SWAS-8-12-AWBK SWAS-8-16-AWBK SWAS-8-20-AWBK SWAS-8-25-AWBK SWF-10 SWF-12 SWF-16 SWF-6 SWF-8 SWALG-3-F SWALG-4-F SWALG-5-F SWALG-6-F SWA-10.5-21-2-F-GJ SWA-13-24-2.5-F-GJ SWA-17-30-3-F-GJ SWA-5.3-10-1-F-GJ SWA-6.5-13-1-F-GJ SWA-8.5-18-1.6-F-GJ SWAJ-10-F SWAJ-3-F SWAJ-4-F SWAJ-5-F SWAJ-6-F SWAJ-8-F SWAS-#10-IF SWAS-#4-IF SWAS-#6-IF SWAS-#8-IF SWAS-1/4-IF SWAS-3/8-IF SWAS-5/16-IF
Image Spring Washer for Inch Screw Washers - Titanium Washers - Titanium Inconel Washer Washers - Molybdenum Plastic Washers - PEEK Plastic Washer - PPS Plastic Washers - RENY Plastic Washers - RENY
Part Name Spring Washer for Inch Screw Washers - Titanium Washers - Titanium Inconel Washer Washers - Molybdenum Plastic Washers - PEEK Plastic Washer - PPS Plastic Washers - RENY Plastic Washers - RENY
Part Number SWAS-IS SWAT-F SWAT-S SWAI-F SWAM-F SPE-W SPS-W SPA-W SPA-W-BK
Feature For Inch Screws Lightweight
Nonmagnetic
Chemical Resistance		 Lightweight
Nonmagnetic
Chemical Resistance		 Chemical Resistance
Heat Resistance		 Heat Resistance Low Outgas
Heat Resistance
Chemical Resistance
Electrical Insulation		 Heat Resistance
Chemical Resistance		 High Strength
High Specific Strength
Lightweight		 High Strength
High Specific Strength
Lightweight
Material Equivalent to SUS304 Grade 2 Titanium Grade 2 Titanium Inconel equiv. Pure molybdenum PEEK PPS RENY RENY
Surface Treatment - - - - - - - - -
Thread Size No.4-40UNC ～ 3/8-16UNC M3 ～ M10 M3 ～ M10 M3 ～ M8 M3 ～ M8 M2 ～ M12 M3 ～ M12 M3 ～ M16 -
Operating Temperature (℃) - - - - - - - - -
CAD CAD CAD CAD CAD CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications
List SWAS-#10-IS SWAS-#4-IS SWAS-#6-IS SWAS-#8-IS SWAS-1/4-IS SWAS-3/8-IS SWAS-5/16-IS SWAT-10-F SWAT-3-F SWAT-4-F SWAT-5-F SWAT-6-F SWAT-8-F SWAT-10-S SWAT-3-S SWAT-4-S SWAT-5-S SWAT-6-S SWAT-8-S SWAI-3-F SWAI-4-F SWAI-5-F SWAI-6-F SWAI-8-F SWAM-3-F SWAM-4-F SWAM-5-F SWAM-6-F SWAM-8-F SPE-10-W SPE-10-W(100) SPE-12-W SPE-12-W(100) SPE-2.6-W SPE-2.6-W(100) SPE-2-W SPE-2-W(100) SPE-3-W SPE-3-W(100) SPE-4-W SPE-4-W(100) SPE-5-W SPE-5-W(100) SPE-6-W SPE-6-W(100) SPE-8-W SPE-8-W(100) SPS-10-W SPS-12-W SPS-3-W SPS-4-W SPS-5-W SPS-6-W SPS-8-W SPA-10-W SPA-10-W(100) SPA-10-W(500) SPA-12-W SPA-12-W(100) SPA-12-W(500) SPA-16-W SPA-16-W(50) SPA-3-W SPA-3-W(100) SPA-3-W(1000) SPA-4-W SPA-4-W(100) SPA-4-W(1000) SPA-5-W SPA-5-W(100) SPA-5-W(1000) SPA-6-W SPA-6-W(100) SPA-6-W(1000) SPA-8-W SPA-8-W(100) SPA-8-W(500) SPA-10-W-BK SPA-10-W-BK(100) SPA-10-W-BK(500) SPA-12-W-BK SPA-12-W-BK(100) SPA-12-W-BK(500) SPA-3-W-BK SPA-3-W-BK(100) SPA-3-W-BK(1000) SPA-4-W-BK SPA-4-W-BK(100) SPA-4-W-BK(1000) SPA-5-W-BK SPA-5-W-BK(100) SPA-5-W-BK(1000) SPA-6-W-BK SPA-6-W-BK(100) SPA-6-W-BK(1000) SPA-8-W-BK SPA-8-W-BK(100) SPA-8-W-BK(500)
Image Plastic Washer - PTFE Plastic Washers - PVDF Plastic Washer - PP Plastic Washers - PC Plastic Washers - PC Washers with Vent Groove Washers with Vent Groove - Chemical Polish Washers with Vent Groove - Titanium Retaining Washers
Part Name Plastic Washer - PTFE Plastic Washers - PVDF Plastic Washer - PP Plastic Washers - PC Plastic Washers - PC Washers with Vent Groove Washers with Vent Groove - Chemical Polish Washers with Vent Groove - Titanium Retaining Washers
Part Number SPT-W SPV-W1 SPP-W SPC-W SPC-W-WH SWAS-VF SWAS-VF-PC SWAT-VF SWAS-SC
Feature Chemical Resistance
Heat Resistance
Electrical Insulation		 Chemical Resistance Chemical Resistance Electrical Insulation
Lightweight
Shock Resistance
Weather Resistance		 Electrical Insulation
Lightweight
Shock Resistance
Weather Resistance		 Standard Low outgas Lightweight
Nonmagnetic		 Loss Prevention
for Commercial Screws
Material PTFE (Polytetrafluoroethylene) PVDF PP PC PC SUS304 SUS304 Grade 2 Titanium -
Surface Treatment - - - - - - Special Chemical Polishing - -
Thread Size M3 ～ M12 M3 ～ M12 M4 ～ M12 M2 ～ M12 - M2 ～ M12 M3 ～ M12 M3 ～ M5 M3 ～ M12
Operating Temperature (℃) - - - - - - - - -
CAD CAD CAD CAD CAD CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications
List SPT-10-W SPT-12-W SPT-3-W SPT-4-W SPT-5-W SPT-6-W SPT-8-W SPV-10-W1 SPV-10-W1(100) SPV-12-W1 SPV-12-W1(50) SPV-3-W1 SPV-3-W1(100) SPV-4-W1 SPV-4-W1(100) SPV-5-W1 SPV-5-W1(100) SPV-6-W1 SPV-6-W1(100) SPV-8-W1 SPV-8-W1(100) SPP-10-W SPP-12-W SPP-4-W SPP-5-W SPP-6-W SPP-8-W SPC-10-W SPC-10-W(500) SPC-12-W SPC-12-W(500) SPC-2.6-W SPC-2.6-W(1000) SPC-2-W SPC-2-W(1000) SPC-3L-W SPC-3L-W(1000) SPC-3-W SPC-3-W(1000) SPC-4-W SPC-4-W(1000) SPC-5-W SPC-5-W(1000) SPC-6-W SPC-6-W(1000) SPC-8-W SPC-8-W(500) SPC-10-W-WH SPC-10-W-WH(500) SPC-12-W-WH SPC-12-W-WH(500) SPC-8-W-WH SPC-8-W-WH(500) SWAS-10-VF SWAS-12-VF SWAS-2.5-VF SWAS-2-VF SWAS-3-VF SWAS-4-VF SWAS-5-VF SWAS-6-VF SWAS-8-VF 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 SWAT-3-VF SWAT-4-VF SWAT-5-VF SWAS-10-SC SWAS-12-SC SWAS-3-SC SWAS-4-SC SWAS-5-SC SWAS-6-SC SWAS-8-SC
Image Plastic Captive Washers - PC Ribbed Lock Washers Ribbed Lock Washers Eccentric Lock Washer™ Spherical Washers Spherical Washers Seal Washer Seal Washer Seal washer
Part Name Plastic Captive Washers - PC Ribbed Lock Washers Ribbed Lock Washers Eccentric Lock Washer™ Spherical Washers Spherical Washers Seal Washer Seal Washer Seal washer
Part Number SPC-SW SWR SWRS SWAS-EW SQW SQWS SWS SWS-F SWS-E
Feature Electrical Insulation
Lightweight
Shock Resistance
Weather Resistance		 Vibration Resistant Vibration Resistant Vibration resistant treatment with commercial hexagon nut Supports SurfaceTilt to 2° Supports SurfaceTilt to 2°or　3° Air and Liquid LeakPrevention Air and Liquid LeakPrevention Air and Liquid LeakPrevention
Material PC Steel Stainless Steel SUS304 Steel SUS304 SUS304 SUS304 SUS304
Surface Treatment - Ferrosoferric Oxide Film (Black) - - Ferrosoferric Oxide Film (Black) - - - -
Thread Size M3 ～ M6 M2 ～ M20 M1.6 ～ M20 M6 ～ M12 M3 ～ M12 M3 ～ M24 M3 ～ M16 M3 ～ M16 M3 ～ M16
Operating Temperature (℃) - - - - - - - - -
CAD CAD CAD CAD CAD CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications
List SPC-3-SW SPC-4-SW SPC-5-SW SPC-6-SW SWR-10 SWR-12 SWR-16 SWR-2 SWR-2.5 SWR-20 SWR-3 SWR-4 SWR-5 SWR-6 SWR-8 SWRS-1.6 SWRS-10 SWRS-12 SWRS-16 SWRS-2 SWRS-2.5 SWRS-20 SWRS-3 SWRS-4 SWRS-5 SWRS-6 SWRS-8 SWAS-10-EW SWAS-12-EW SWAS-6-EW SWAS-8-EW SQW-10 SQW-12 SQW-3 SQW-4 SQW-5 SQW-6 SQW-8 SQWS-10 SQWS-12 SQWS-16 SQWS-20 SQWS-24 SQWS-3 SQWS-4 SQWS-5 SQWS-6 SQWS-8 SWS-10 SWS-12 SWS-16 SWS-3 SWS-4 SWS-5 SWS-6 SWS-8 SWS-10-F SWS-12-F SWS-16-F SWS-3-F SWS-4-F SWS-5-F SWS-6-F SWS-8-F SWS-10-E SWS-12-E SWS-16-E SWS-3-E SWS-4-E SWS-5-E SWS-6-E SWS-8-E
Image Seal washer Seal Washers - PFA Coating Locking and Sealing Rings Locking and Sealing Rings Flat Washer for Slotted Holes Rosette Washer Panel Protection Washers (Steel) Panel Protection Washers (Aluminum) Panel Protection Washers (Stainless Steel)
Part Name Seal washer Seal Washers - PFA Coating Locking and Sealing Rings Locking and Sealing Rings Flat Washer for Slotted Holes Rosette Washer Panel Protection Washers (Steel) Panel Protection Washers (Aluminum) Panel Protection Washers (Stainless Steel)
Part Number SWS-S SWS-HTF SWC SWH SWAS-PPK SWAS-RW FPW FPWA FPWS
Feature Prevention of
air/liquid leakage		 Chemical Resistance For socket head cap screws For hex head screws and hex nuts Flat Washers for Slotted Holes for Flat Head Screw Panel Protection Panel Protection Panel Protection
Material SUS304 SUS304 Polyamide Polyamide - SUS303 Steel Aluminum SUS304
Surface Treatment - PFA Coating - - - - Trivalent chromate treatment - -
Thread Size M3 ～ M16 M3 ～ M8 M4 ～ M12 M3 ～ M12 M5 ～ M10 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 SWS-10-S SWS-12-S SWS-16-S SWS-3-S SWS-4-S SWS-5-S SWS-6-S SWS-8-S SWS-3-HTF SWS-4-HTF SWS-5-HTF SWS-6-HTF SWS-8-HTF SWC-10 SWC-12 SWC-4 SWC-5 SWC-6 SWC-8 SWH-10 SWH-12 SWH-3 SWH-4 SWH-5 SWH-6 SWH-8 SWAS-10-30-3-2-PPK SWAS-5-20-2-2-PPK SWAS-6-20-2-2-PPK SWAS-8-25-3-2-PPK SWAS-3-RW SWAS-4-RW SWAS-5-RW SWAS-6-RW FPW-4-3.5 FPW-4-5.5 FPW-5-3.5 FPW-5-5.5 FPW-6-3.5 FPW-6-5.5 FPWA-4-3.5 FPWA-4-5.5 FPWA-5-3.5 FPWA-5-5.5 FPWA-6-3.5 FPWA-6-5.5 FPWS-4-3.5 FPWS-4-5.5 FPWS-5-3.5 FPWS-5-5.5 FPWS-6-3.5 FPWS-6-5.5
Image Key locking threaded insert for thread reinforcement Dedicated Mounting Tool for Keyed Female-Thread Reinforcing Insert
Part Name Key locking threaded insert for thread reinforcement Dedicated Mounting Tool for Keyed Female-Thread Reinforcing Insert
Part Number SHINS SKK
Feature Key locking threaded insert
thread reinforcement		 Dedicated Mounting Tool for SHINS
Material SUS303 SUS303
Surface Treatment - -
Thread Size M4 ～ M12 -
Operating Temperature (℃) - -
CAD CAD CAD
Specifications Specifications Specifications
List SHINS-M10-M14 SHINS-M12-M16 SHINS-M4-M8 SHINS-M5-M8 SHINS-M6-M10 SHINS-M8-M12 SKK-10 SKK-12 SKK-45 SKK-6 SKK-8

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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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