SEMS Screws / Improved Fastening Efficiency Screws

What is productivity improvement

＜Reduction of washer assembly processes＞

These are screws with a built-in washer, such as SEMS screws, or screws with a flange that provides a stable seating surface.
These screws simplify assembly work as they do not require separate washers.
There is no concern about forgetting to attach washers or them falling off.
Increased-Productivity_2en

＜Easy screw insertions in locations with poor workability＞
Guides at screw tips enable easy vertical insertions into internal threads even in locations with poor workability, preventing galling and breakages caused by angled tightening.
SSC-IG_tokucyou_cad

▶Galling prevention with guided screws

●Self-Aligning Socket Head Cap Screws with Guide Tip

●Self-Aligning Socket Head Cap Captive Screws with Guide Tip

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Part Name	Self-Aligning Socket Head Cap Screws with Guide Tip	Self-Aligning Socket Head Cap Captive Screws with Guide Tip	Hexagon Head Screws with Captive Washer	Socket Head Cap Screws with Washers for Sheet Metal (SEMS)	Hexagon Head Screws with Captive Washer	Phillips Pan Head Screws with Washers for Sheet Metal (SEMS)	Phillips Pan Head Screws with Washers for Sheet Metal (SEMS)	Titanium Hex Socket Head Cap Screws with Captive Washers	Titanium Hex Socket Head Cap Screws with Captive Washers
Part Number	SNSS-IG	SSC-IG	SNHP2S	SNSQS-SUC	SNHP3S	SNPI3-SUC	SNPI3S-SUC	SNSI1T	SNSI1T-UT
Feature	With Guide Seizing Prevention	With Guide Seizing Prevention Captive/Loss Prevention	Compliant with JIS B 1187 With Captive Washer P=2	For Sheet Metal Captive Washers P=3	Compliant with JIS B 1187 With Captive Washer P=3	For Sheet Metal Space-Saving Captive Washers P=3	For Sheet Metal Space-Saving Captive Washers P=3	Captive Washers I=1	Captive Washers I=1
Material	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	Equivalent to SUS304	SUSXM7 (Equivalent to SUS304)	Equivalent to SUS304	Steel	SUSXM7 (Equivalent to SUS304)	Grade 2 Titanium	Grade 2 Titanium
Surface Treatment	-	-	-	-	-	Trivalent chromate treatment	-	Special Chemical Polishing	-
Thread Size	M3 ～ M8	M3 ～ M8	M4 ～ M10	M3 ～ M6	M4 ～ M12	M3 ～ M5	M3 ～ M6	M3 ～ M6	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	SNSS-M3-IG SNSS-M4-IG SNSS-M5-IG SNSS-M6-IG SNSS-M8-IG	SSC-M3-IG SSC-M4-IG SSC-M5-IG SSC-M6-IG SSC-M8-IG	SNHP2S-M10 SNHP2S-M4 SNHP2S-M5 SNHP2S-M6 SNHP2S-M8	SNSQS-M3-SUC SNSQS-M4-SUC SNSQS-M5-SUC SNSQS-M6-SUC	SNHP3S-M10 SNHP3S-M12 SNHP3S-M4 SNHP3S-M5 SNHP3S-M6 SNHP3S-M8	SNPI3-M3-SUC SNPI3-M4-SUC SNPI3-M5-SUC	SNPI3S-M3-SUC SNPI3S-M4-SUC SNPI3S-M5-SUC SNPI3S-M6-SUC	SNSI1T-M3 SNSI1T-M4 SNSI1T-M5 SNSI1T-M6	SNSI1T-M3-UT SNSI1T-M4-UT SNSI1T-M5-UT SNSI1T-M6-UT

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Part Name	Phillips Cross Recessed Pan Head Machine Screws with Captive Washers	Hex Socket Head Cap Screws with Captive Washers	Hex Socket Head Cap Screws with Captive Washers- High Strength Stainless Steel	Titanium Hex Socket Head Cap Screws with Captive Washers	Titanium Hex Socket Head Cap Screws with Captive Washers	Phillips Cross Recessed Pan Head Machine Screws with Captive Washers	Hexalobular Socket Pan Head Machine Screws (with Pin) with Washer	Hexalobular Socket (with Pin) Pan Head Machine Screws with Washer with Nylon Patch	Socket Head Cap Screws with Captive Large Flat Washer for Slotted Holes
Part Number	SNPI1S	SNSQS	SNSQLG	SNSI3T	SNSI3T-UT	SNPI3S	SRTSQ-TZB	SRTSQ-TZB-ALK	SNSQS-LW
Feature	Captive Washers I=1	Captive Washers I=3	High Strength (Strength Class 10.8 Equivalent) Heat Resistance Corrosion Resistance Nonmagnetic Captive Washers I=3	Captive Washers I=3	Captive Washers I=3	Captive Washers I=3	Hexalobular Socket With Pin Captive Washer I=3	Hexalobular Socket With Pin Captive Washer I=3	For Long Holes Captive Washers Large-Diameter Plain Washers
Material	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUS316L	Grade 2 Titanium	Grade 2 Titanium	SUSXM7 (Equivalent to SUS304)	Steel	Steel	SUSXM7 (Equivalent to SUS304)
Surface Treatment	-	-	-	Special Chemical Polishing	-	-	Trivalent chromate treatment	Trivalent chromate treatment	-
Thread Size	M2.5 ～ M5	M3 ～ M6	M3 ～ M6	M3 ～ M6	M3 ～ M6	M2 ～ M6	M2 ～ M4	M2 ～ M4	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	SNPI1S-M2.5 SNPI1S-M3 SNPI1S-M4 SNPI1S-M5	SNSQS-M3 SNSQS-M4 SNSQS-M5 SNSQS-M6	SNSQLG-M3 SNSQLG-M4 SNSQLG-M5 SNSQLG-M6	SNSI3T-M3 SNSI3T-M4 SNSI3T-M5 SNSI3T-M6	SNSI3T-M3-UT SNSI3T-M4-UT SNSI3T-M5-UT SNSI3T-M6-UT	SNPI3S-M2 SNPI3S-M2.5 SNPI3S-M3 SNPI3S-M4 SNPI3S-M5 SNPI3S-M6	SRTSQ-M2.6-TZB SRTSQ-M2-TZB SRTSQ-M3-TZB SRTSQ-M4-TZB	SRTSQ-M2.6-TZB-ALK SRTSQ-M2-TZB-ALK SRTSQ-M3-TZB-ALK SRTSQ-M4-TZB-ALK	SNSQS-M3-LW SNSQS-M4-LW SNSQS-M5-LW SNSQS-M6-LW

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Part Name	Vented Socket Head Cap Screws with Captive Washers	Vented Socket Head Cap Screws with Captive Washers - Chemical Polish	Vented Socket Head Cap Screws with Captive Washers	Vented Socket Head Cap Screws with Captive Washers - Hign Intensity Stainless Steel	Flanged Socket Head Cap Screws	Flanged Socket Head Cap Screws	Flanged Socket Head Cap Screws - Cleanroom Washed & Packaged	Flanged Socket Head Cap Screws with Nylon Patch	Flanged Socket Head Cap Captive Screws
Part Number	SVSI1S	SVSI1S-PC	SVSQS	SVSQLG	SFS	SFSS	SFSS-UCL	SFSS-ALK	SSC-SFSS
Feature	Captive Washers I=1	Captive Washers I=1	Captive Washers I=3	High Strength (Strength Class 10.8 Equivalent) Captive Washers I=3	Flanged	Flanged	Flanged Cleanroom Washed & Packaged	Flanged Nylon Patch	Flanged Captive/Loss Prevention
Material	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUS316L	Steel	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)
Surface Treatment	-	Special Chemical Polishing	-	-	Ferrosoferric Oxide Film (Black)	-	-	-	-
Thread Size	M3 ～ M6	M3 ～ M6	M3 ～ M12	M3 ～ M6	M6 ～ M12	M4 ～ M8	M4 ～ M8	M4 ～ M8	M4 ～ M8
Operating Temperature (℃)	-	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	SVSI1S-M3 SVSI1S-M4 SVSI1S-M5 SVSI1S-M6	SVSI1S-M3-PC SVSI1S-M4-PC SVSI1S-M5-PC SVSI1S-M6-PC	SVSQS-M10 SVSQS-M12 SVSQS-M3 SVSQS-M4 SVSQS-M5 SVSQS-M6 SVSQS-M8	SVSQLG-M3 SVSQLG-M4 SVSQLG-M5 SVSQLG-M6	SFS-M10 SFS-M12 SFS-M6 SFS-M8	SFSS-M4 SFSS-M5 SFSS-M6 SFSS-M8	SFSS-M4-UCL SFSS-M5-UCL SFSS-M6-UCL SFSS-M8-UCL	SFSS-M4-ALK SFSS-M5-ALK SFSS-M6-ALK SFSS-M8-ALK	SSC-SFSS-M4 SSC-SFSS-M5 SSC-SFSS-M6 SSC-SFSS-M8

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Part Name	Flanged Socket Head Cap Screws - Specialized Chemical Polishing	Flanged Socket Head Cap Screws - PTFE Coating	Flanged Socket Head Cap Screws - Low Temperature Black Chrome Treatment	Flanged Hex Bolts	Flanged Hex Bolts	Socket Button Head Cap Screws with Flange	Socket Button Head Cap Screws with Flange - Electroless Nickel Plating	Socket Button Head Cap Screws with Flange	Vented Flanged Socket Head Cap Screws
Part Number	SFSS-PC	SFSS-TF	SFSS-RY	SFH-TZB	SFHS	SFB	SFB-EL	SFBS	SVFSS
Feature	Flanged Low Outgas	Flanged Chemical Resistance Seizing Prevention	Flanged Chemical Resistance Anti-reflection Seizing Prevention	Flanged Compliant with JIS B 1189	Flanged Compliant with JIS B 1189	With Flange Space-saving	With Flange Space-saving	With Flange Space-saving	With Flange
Material	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	Steel	SUS304	Steel	Steel	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)
Surface Treatment	Special Chemical Polishing	PTFE coating	Low temperature black chrome treatment	Trivalent chromate treatment	-	Ferrosoferric Oxide Film (Black)	Electroless nickel plating	-	-
Thread Size	M4 ～ M8	M4 ～ M8	M4 ～ M8	M8 ～ M12	M6 ～ M8	M3 ～ M8	M3 ～ M8	M3 ～ M6	M4 ～ M8
Operating Temperature (℃)	-	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	SFSS-M4-PC SFSS-M5-PC SFSS-M6-PC SFSS-M8-PC	SFSS-M4-TF SFSS-M5-TF SFSS-M6-TF SFSS-M8-TF	SFSS-M4-RY SFSS-M5-RY SFSS-M6-RY SFSS-M8-RY	SFH-M10-TZB SFH-M12-TZB SFH-M8-TZB	SFHS-M6 SFHS-M8	SFB-M3 SFB-M4 SFB-M5 SFB-M6 SFB-M8	SFB-M3-EL SFB-M4-EL SFB-M5-EL SFB-M6-EL SFB-M8-EL	SFBS-M3 SFBS-M4 SFBS-M5 SFBS-M6	SVFSS-M4 SVFSS-M5 SVFSS-M6 SVFSS-M8

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Part Name	Vented Flanged Socket Head Cap Screws – Specialized Chemical Polishing	Socket Button Head Cap Screws with Flange for Sheet Metal	Truss Head Phillips Screws for Sheet Metal	Hex Nuts / Hex Flange Nuts - Titanium	Hexalobular Socket Head Cap Screws with Super Ultra Low Profile	Hexalobular Socket Head Cap Screws with Super Ultra Low Profile	Hexalobular Socket Head Cap Screws with Super Ultra Low Profile and Nylon Patch	Hexalobular Socket Head Cap Screws with Super Ultra Low Profile	Hexalobular Socket Head Cap Screws with Super Ultra Low Profile and Nylon Patch
Part Number	SVFSS-PC	SFBS-UC	SNMS-UC	SHNT-F	SET-NI	SET-BNI	SET-NI-ALK	SETS	SETS-ALK
Feature	With Flange Low Outgas	Flanged Space-Saving For Sheet Metal (Plate Thickness 0.1mm or More)	Truss Head Screws Space-Saving For Sheet Metal (Plate Thickness 0.1mm or More)	Lightweight Nonmagnetic Chemical Resistance With Flange	Hexalobular Socket Super Ultra Low Profile Space-saving	Hexalobular Socket Super Ultra Low Profile Space-saving	Hexalobular Socket Extra Low Profile Space-Saving Nylon Patch	Hexalobular Socket Super Ultra Low Profile Space-saving	Hexalobular Socket Extra Low Profile Space-Saving Nylon Patch
Material	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	Grade 2 Titanium	Steel	Steel	Steel	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)
Surface Treatment	Special Chemical Polishing	-	-	Special Chemical Polishing	Nickel plating	Black Nickel Plating	Nickel plating	-	-
Thread Size	M4 ～ M8	M3 ～ M6	M3 ～ M6	M3 ～ M10	M3 ～ M5	M3 ～ M5	M3 ～ M5	M2 ～ M6	M2 ～ M6
Operating Temperature (℃)	-	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	SVFSS-M4-PC SVFSS-M5-PC SVFSS-M6-PC SVFSS-M8-PC	SFBS-M3-UC SFBS-M4-UC SFBS-M5-UC SFBS-M6-UC	SNMS-M3-UC SNMS-M4-UC SNMS-M5-UC SNMS-M6-UC	SHNT-M10-F SHNT-M3-F SHNT-M4-F SHNT-M5-F SHNT-M6-F SHNT-M8-F	SET-M3-NI SET-M4-NI SET-M5-NI	SET-M3-BNI SET-M4-BNI SET-M5-BNI	SET-M3-NI-ALK SET-M4-NI-ALK SET-M5-NI-ALK	SETS-M2 SETS-M2.6 SETS-M3 SETS-M4 SETS-M5 SETS-M6	SETS-M2.6-ALK SETS-M2-ALK SETS-M3-ALK SETS-M4-ALK SETS-M5-ALK SETS-M6-ALK

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Part Name	Hexalobular Socket Head Cap Screws with Super Ultra Low Profile - Aluminum	Hexalobular Socket Head Cap Screws with Super Ultra Low Profile (Inch Thread)	Hexalobular Socket Head Cap Screws with Super Ultra Low Profile - Stainless Steel (Inch Thread)	Cross Recessed Head Cap Screws with Super Ultra Low Profile	Cross Recessed Head Cap Screws with Super Ultra Low Profile	Cross Recessed Head Cap Screws with Super Ultra Low Profile - Stainless Steel
Part Number	SETA	SET-TZB(INCH)	SETS(INCH)	SEQ-TZB	SEQ-TBZ	SEQS
Feature	Super Special Low Profile With Hexalobular Socket Space-saving	Hexalobular Socket Super Ultra Low Profile Space-saving Inch Screws	Hexalobular Socket Super Ultra Low Profile Space-saving Inch Screws	Super Ultra Low Profile Space-saving	Super Ultra Low Profile Space-saving	Super Ultra Low Profile Space-saving
Material	A5056	Steel	SUSXM7 (Equivalent to SUS304)	Steel	Steel	SUSXM7 (Equivalent to SUS304)
Surface Treatment	-	Trivalent chromate treatment	-	Trivalent chromate treatment	Black Trivalent Chromate Treatment	-
Thread Size	M3 ～ M6	No.6-32UNC ～ No.10-32UNF	No.4-40UNC ～ No.10-32UNF	M3 ～ M4	M3 ～ M4	M3 ～ M4
Operating Temperature (℃)	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	SETA-M3 SETA-M4 SETA-M5 SETA-M6	SET-#10-24-TZB SET-#10-32-TZB SET-#6-32-TZB SET-#8-32-TZB	SETS-#10-24 SETS-#10-32 SETS-#4-40 SETS-#6-32 SETS-#8-32	SEQ-M3-TZB SEQ-M4-TZB	SEQ-M3-TBZ SEQ-M4-TBZ	SEQS-M3 SEQS-M4

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This page introduces washers. As well as a description of washers, the washer products handled by NBK are introduced.

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Helpful Resources

SEMS Screws: Efficiency and Convenience in Fastening

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No. 6: Thermal Cycling

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No. 8: Preventing Part Fall-out

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

Washer fall-out prevention is required 【Workability/Maintenance】

Monitors need to be movable with one touch in accordance with the worker's height or the nature of the work【Improved productivity/workability】

Simple positioning with vertical axes is needed 【Workability / maintenance】

Moving the control panel of a machine tool horizontally【Workability & Maintenance】

Hexalobular Internal Driving Feature for Bolts and Screws

Unified Coarse Screw Threads/Unified Fine Screw Threads

Vol. 12 Back to Basics Series! Screw Reference Dimensions

Slip Torque of Coupling – Set Screw Type

Property of High Performance Stainless Steel Screws

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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

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Procedure of Selection

Choosing the most suitable coupling

Choosing the most suitable coupling

Procedure of Selection (Actuator)

Procedure of Selection

No. 6: Thermal Cycling

Washer fall-out prevention is required 【Workability/Maintenance】

Monitors need to be movable with one touch in accordance with the worker's height or the nature of the work【Improved productivity/workability】

Simple positioning with vertical axes is needed 【Workability / maintenance】

No. 8: Preventing Part Fall-out

SEMS Screws: Efficiency and Convenience in Fastening

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Description of Tamper Resistant Screws & Security Screws (Bolts) for the Engineers

No. 2: Vacuum environments

What are Hex Nuts?

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

Preventing gaps between the sheet and screw when fastening thin sheets

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

Higher torque and Lower price.

NBK SPECIAL SCREWS

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Select Based on Application

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No. 6: Thermal Cycling

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

Miniature Screws/Precision Screws Lineup List

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What makes our custom screws special

Customization

NBK SPECIAL SCREWS

Flexus

Designs and Examples of What NBK Can Create

No. 6: Thermal Cycling

Select Based on Application

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

No. 5: Solving common problems inside equipment

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

Washers: Essential Components for Secure Connections

What are Socket Head Cap Screws (Bolts) ?

Hexalobular Internal Driving Feature for Bolts and Screws

Simple positioning with vertical axes is needed 【Workability / maintenance】

Unified Coarse Screw Threads/Unified Fine Screw Threads

Washers: Essential Components for Secure Connections

No. 6: Thermal Cycling

What are Socket Head Cap Screws (Bolts) ?

Washer fall-out prevention is required 【Workability/Maintenance】

Hexalobular Internal Driving Feature for Bolts and Screws

Vol.6　Varieties of Screws "Beyond" SUS

Vol.1　What is Seizing (Galling)?

Vol.4　What are washers used for?

Vol.7　Screw Tightening Control Methods