Washers / Inserts

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

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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

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Part Name	Spring Washer for Inch Screw	Washers - Titanium	Washers - Titanium	Inconel Washer	Washers - Molybdenum	Plastic Washer - PEEK	Plastic Washer - PPS	Plastic Washer - RENY	Plastic Washer - PTFE
Part Number	SWAS-IS	SWAT-F	SWAT-S	SWAI-F	SWAM-F	SPE-W	SPS-W	SPA-W	SPT-W
Feature	For Inch Screws	Lightweight Nonmagnetic Chemical Resistance	Lightweight Nonmagnetic Chemical Resistance	Chemical Resistance Heat Resistance	Heat Resistance	Chemical Resistance Heat Resistance	Heat Resistance Chemical Resistance	High Strength	Chemical Resistance Heat Resistance Electrical Insulation
Material	Equivalent to SUS304	Grade 2 Titanium	Grade 2 Titanium	Inconel equiv.	Pure molybdenum	PEEK	PPS	RENY	PTFE (Polytetrafluoroethylene)
Surface Treatment	-	-	-	-	-	-	-	-	-
Thread Size	No.4-40UNC ～ 3/8-16UNC	M3 ～ M10	M3 ～ M10	M3 ～ M8	M3 ～ M8	M2 ～ M10	M3 ～ M12	M3 ～ M16	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	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-2.6-W SPE-2-W SPE-3-W SPE-4-W SPE-5-W SPE-6-W SPE-8-W	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-12-W SPA-16-W SPA-3-W SPA-4-W SPA-5-W SPA-6-W SPA-8-W	SPT-10-W SPT-12-W SPT-3-W SPT-4-W SPT-5-W SPT-6-W SPT-8-W

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Part Name	Plastic Washers - PVDF	Plastic Washer - PP	Plastic Washer - PC	Washers with Ventilation Grooves	Washers with Ventilation Grooves - Chemical Polish	Washers with Ventilation Grooves - Titanium	Retaining Washers	Ribbed Lock Washers	Ribbed Lock Washers
Part Number	SPV-W1	SPP-W	SPC-W	SWAS-VF	SWAS-VF-PC	SWAT-VF	SWAS-SC	SWR	SWRS
Feature	Chemical Resistance	Chemical Resistance	Shock Resistance Weather Resistance	Standard	Low outgas	Lightweight Nonmagnetic	Commercially Available Fall Prevention	Vibration Resistant	Vibration Resistant
Material	PVDF	PP	PC	SUS304	SUS304	Grade 2 Titanium	-	Steel	Stainless Steel
Surface Treatment	-	-	-	-	Special Chemical Polishing	-	-	Ferrosoferric Oxide Film (Black)	-
Thread Size	M3 ～ M12	M4 ～ M12	M2 ～ M8	M2 ～ M12	M3 ～ M12	M3 ～ M5	M3 ～ M12	M2 ～ M20	M1.6 ～ M20
Operating Temperature (℃)	-	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	SPV-10-W1 SPV-12-W1 SPV-3-W1 SPV-4-W1 SPV-5-W1 SPV-6-W1 SPV-8-W1	SPP-10-W SPP-12-W SPP-4-W SPP-5-W SPP-6-W SPP-8-W	SPC-2.6-W SPC-2-W SPC-3-W SPC-4-W SPC-5-W SPC-6-W SPC-8-W	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	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

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Part Name	Eccentric Lock Washer™	Spherical Washers	Spherical Washers	Seal Washer	Seal Washer	Seal washer	Seal washer	Seal Washers - PFA Coating	Locking and Sealing Rings
Part Number	SWAS-EW	SQW	SQWS	SWS	SWS-F	SWS-E	SWS-S	SWS-HTF	SWC
Feature	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	Prevention of air/liquid leakage	Chemical Resistance	For socket head cap screws
Material	SUS304	Steel	SUS304	SUS304	SUS304	SUS304	SUS304	SUS304	Polyamide
Surface Treatment	-	Ferrosoferric Oxide Film (Black)	-	-	-	-	-	PFA Coating	-
Thread Size	M6 ～ M12	M3 ～ M12	M3 ～ M24	M3 ～ M16	M3 ～ M16	M3 ～ M16	M3 ～ M16	M3 ～ M8	M4 ～ M12
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-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	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

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Part Name	Locking and Sealing Rings	Flat Washer for Slotted Holes	Rosette Washer	Panel Protection Washers (Steel)	Panel Protection Washers (Aluminum)	Panel Protection Washers (Stainless Steel)	Key locking threaded insert for thread reinforcement	Dedicated Mounting Tool for Keyed Female-Thread Reinforcing Insert
Part Number	SWH	SWAS-PPK	SWAS-RW	FPW	FPWA	FPWS	SHINS	SKK
Feature	For hex head screws and hex nuts	Flat Washers for Slotted Holes	for Flat Head Screw	Panel Protection	Panel Protection	Panel Protection	Key locking threaded insert thread reinforcement	Dedicated Mounting Tool for SHINS
Material	Polyamide	-	SUS303	Steel	Aluminum	SUS304	SUS303	SUS303
Surface Treatment	-	-	-	Trivalent chromate treatment	-	-	-	-
Thread Size	M3 ～ M12	M5 ～ M10	M3 ～ M6	-	-	-	M4 ～ M12	-
Operating Temperature (℃)	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	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	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

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!

What are Hex Socket Head Cap Screws (cap bolts)?

Hex Socket Head Cap Screws (cap bolts) are bolts (screws) with hexagon-shaped holes in their heads. It lists product descriptions for hex socket head cap screws, recommended products, etc.

What are Captive Screws? Introduction of the NBK Captive Series

NBK has standardized products for fall prevention of parts in the knob, pull and e-nedzi.com (special screw) categories. Use NBK's Captive Series for food machinery, packaging machinery and chemical manufacturing equipment that require CE Marking Compliance and Contamination Control.

No. 8: Preventing Part Fall-out

Are you struggling with screw or washer fall-out during equipment assembly or maintenance?
Here we introduce products that can be used to prevent part fall-out.

Helpful Resources

No. 2: Vacuum environments

What are Hex Socket Head Cap Screws (cap bolts)?

What are Captive Screws? Introduction of the NBK Captive Series

No. 8: Preventing Part Fall-out

No. 6: Thermal Cycling

Customization

Flexus

Designs and Examples of What NBK Can Create

Ball Rollers : Characteristics

Custom made

Cleanroom Wash / Cleanroom Packing Service

Screw Length Adjustment Service

Couplings Bore and Keyway Additional Modification Service

Captive Processing Service

Screw combination service

No. 6: Thermal Cycling

Stainless Steel Screws Resistant to High Pressure【Improved productivity/workability】

Vol.1 What is Seizing (Galling)?

Vol.7 Screw Tightening Control Methods

Select the best screws for your needs

Plastic Screw Property

Vol.4 What are washers used for?

Hexagon Socket Head Cap Screws Excerpts from ISO 4762：2004, JIS B 1176:2015

Vol. 12 Back to Basics Series! Screw Reference Dimensions

Slip Torque of Coupling – Set Screw Type

Coupling and Single-axis Actuator Assembly Method

Hints for correctly using NBK products: Quick Positioning Brackets

Hints for correctly using NBK products: Captive Washer for Pull

Hints for correctly using NBK products: Metal Super Knob

Hints for correctly using NBK products: Ball Plungers

Procedure of Selection

Choosing the most suitable coupling

Choosing the most suitable coupling

Procedure of Selection (Actuator)

Procedure of Selection

No. 2: Vacuum environments

What are Captive Screws? Introduction of the NBK Captive Series

No. 8: Preventing Part Fall-out

No. 6: Thermal Cycling

Stainless Steel Screws Resistant to High Pressure【Improved productivity/workability】

No. 2: Vacuum environments

What are Captive Screws? Introduction of the NBK Captive Series

SEMS Screws: Efficiency and Convenience in Fastening

Stainless Steel Screws Resistant to High Pressure【Improved productivity/workability】

CE-marked components which prevent foreign matter contamination are required 【Safety / precautionary measures】

Preventing gaps between the sheet and screw when fastening thin sheets

What is Specific Strength? A new index for weight reduction of equipment 【Smaller and Lighter】

Screws must be protected from chemicals 【Energy-saving / reduced work-hours】

Higher torque and Lower price.

NBK SPECIAL SCREWS

What is a Coupling? Explanation of Types and Characteristics

Solving common issues with Semiconductor Manufacturing Equipment（Pre-Process）

Vol.6 Varieties of Screws "Beyond" SUS

A new generation of disk couplings

A new generation of disk couplings

No. 6: Thermal Cycling

What are low profile screws? Find advantages, disadvantages, and usage examples explained here!

Comparison of the Dimensions of Low Profile Screws and Small Head Screws

No. ９: Increasing Throughput

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

What makes our custom screws special

Customization

NBK SPECIAL SCREWS

Flexus

Designs and Examples of What NBK Can Create

No. 6: Thermal Cycling

No. 5: Solving common problems inside equipment

Solving common issues with Semiconductor Manufacturing Equipment（Pre-Process）

What is Specific Strength? A new index for weight reduction of equipment 【Smaller and Lighter】

Higher torque and Lower price.

No. 2: Vacuum environments

What are Hex Socket Head Cap Screws (cap bolts)?

What are Captive Screws? Introduction of the NBK Captive Series

For better drive

Plastic Screw Property

No. 2: Vacuum environments

What are Hex Socket Head Cap Screws (cap bolts)?

What are Captive Screws? Introduction of the NBK Captive Series

No. 8: Preventing Part Fall-out

No. 6: Thermal Cycling

Vol.1　What is Seizing (Galling)?

Vol.7　Screw Tightening Control Methods

Vol.4　What are washers used for?

Vol.6　Varieties of Screws "Beyond" SUS

Vol.1　What is Seizing (Galling)?

Vol.7　Screw Tightening Control Methods

Vol.1　What is Seizing (Galling)?

Vol.4　What are washers used for?

Vol.7　Screw Tightening Control Methods