SEMS Screws / Improved Fastening Efficiency Screws

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.

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Part Name	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	Phillips Cross Recessed Pan Head Machine Screws with Captive Washers	Hex Socket Head Cap Screws with Captive Washers
Part Number	SNHP2S	SNSQS-SUC	SNHP3S	SNPI3-SUC	SNPI3S-SUC	SNSI1T	SNSI1T-UT	SNPI1S	SNSQS
Feature	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	Captive Washers I=1	Captive Washers I=3
Material	Equivalent to SUS304	SUSXM7 (Equivalent to SUS304)	Equivalent to SUS304	Steel	SUSXM7 (Equivalent to SUS304)	Grade 2 Titanium	Grade 2 Titanium	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)
Surface Treatment	-	-	-	Trivalent chromate treatment	-	Special Chemical Polishing	-	-	-
Thread Size	M4 ～ M10	M3 ～ M6	M4 ～ M12	M3 ～ M5	M3 ～ M6	M3 ～ M6	M3 ～ M6	M2.5 ～ M5	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	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	SNPI1S-M2.5 SNPI1S-M3 SNPI1S-M4 SNPI1S-M5	SNSQS-M3 SNSQS-M4 SNSQS-M5 SNSQS-M6

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Part Name	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	Hex Socket Head Cap Screw with Captive Washer and Ventilation Hole	Hex Socket Head Cap Screw with Captive Washer and Ventilation Hole - Chemical Polish	Hex Socket Head Cap Screws with Captive Washer and Ventilation Hole	Hex Socket Head Cap Screws with Captive Washers and Ventilation Hole - High Strength Stainless Steel	Flanged Socket Head Cap Screws
Part Number	SNSQLG	SNSI3T	SNSI3T-UT	SNPI3S	SVSI1S	SVSI1S-PC	SVSQS	SVSQLG	SFS
Feature	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	Captive Washers I=1	Captive Washers I=1	Captive Washers I=3	High Strength (Strength Class 10.8 Equivalent) Captive Washers I=3	Flanged
Material	SUS316L	Grade 2 Titanium	Grade 2 Titanium	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUS316L	Steel
Surface Treatment	-	Special Chemical Polishing	-	-	-	Special Chemical Polishing	-	-	Ferrosoferric Oxide Film (Black)
Thread Size	M3 ～ M6	M3 ～ M6	M3 ～ M6	M2 ～ M6	M3 ～ M6	M3 ～ M6	M3 ～ M12	M3 ～ M6	M6 ～ M12
Operating Temperature (℃)	-	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	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	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

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Part Name	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	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
Part Number	SFSS	SFSS-UCL	SFSS-ALK	SSC-SFSS	SFSS-PC	SFSS-TF	SFSS-RY	SFH-TZB	SFHS
Feature	Flanged	Flanged Cleanroom Washed & Packaged	Flanged Nylon Patch	Flanged Captive/Loss Prevention	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
Material	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	Steel	SUS304
Surface Treatment	-	-	-	-	Special Chemical Polishing	PTFE coating	Low temperature black chrome treatment	Trivalent chromate treatment	-
Thread Size	M4 ～ M8	M4 ～ M8	M4 ～ M8	M4 ～ M8	M4 ～ M8	M4 ～ M8	M4 ～ M8	M8 ～ M12	M6 ～ 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 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	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

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Part Name	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	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
Part Number	SFB	SFB-EL	SFBS	SVFSS	SVFSS-PC	SFBS-UC	SNMS-UC	SHNT-F	SET-NI
Feature	With Flange Small Space	With Flange Small Space	With Flange Small Space	With Flange	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 Extra Low Profile Small Space
Material	Steel	Steel	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	Grade 2 Titanium	Steel
Surface Treatment	Ferrosoferric Oxide Film (Black)	Electroless nickel plating	-	-	Special Chemical Polishing	-	-	Special Chemical Polishing	Nickel plating
Thread Size	M3 ～ M8	M3 ～ M8	M3 ～ M6	M4 ～ M8	M4 ～ M8	M3 ～ M6	M3 ～ M6	M3 ～ M10	M3 ～ M5
Operating Temperature (℃)	-	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	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	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

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Part Name	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	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 Extra Low Profile
Part Number	SET-BNI	SET-NI-ALK	SETS	SETS-ALK	SETA	SET-TZB(INCH)	SETS(INCH)	SEQ-TZB	SEQ-TBZ
Feature	Hexalobular Socket Extra Low Profile Small Space	Hexalobular Socket Extra Low Profile Space-Saving Nylon Patch	Hexalobular Socket Extra Low Profile Small Space	Hexalobular Socket Extra Low Profile Space-Saving Nylon Patch	Super Special Low Profile With Hexalobular Socket Space-saving	Hexalobular Socket Extra Low Profile Small Space Inch Screws	Hexalobular Socket Extra Low Profile Small Space Inch Screws	Extreme Low Profile Small Space	Extreme Low Profile Small Space
Material	Steel	Steel	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	A5056	Steel	SUSXM7 (Equivalent to SUS304)	Steel	Steel
Surface Treatment	Black Nickel Plating	Nickel plating	-	-	-	Trivalent chromate treatment	-	Trivalent chromate treatment	Black Trivalent Chromate Treatment
Thread Size	M3 ～ M5	M3 ～ M5	M2 ～ M6	M2 ～ M6	M3 ～ M6	No.6-32UNC ～ No.10-32UNF	No.4-40UNC ～ No.10-32UNF	M3 ～ M4	M3 ～ M4
Operating Temperature (℃)	-	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	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	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

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Part Name	Cross Recessed Head Cap Screws with Super Ultra Low Profile - Stainless Steel
Part Number	SEQS
Feature	Extra Low Profile Space-saving
Material	SUSXM7 (Equivalent to SUS304)
Surface Treatment	-
Thread Size	M3 ～ M4
Operating Temperature (℃)	-
CAD	CAD
Specifications	Specifications
List	SEQS-M3 SEQS-M4

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!

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

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

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.

Helpful Resources

No. 2: Vacuum environments

Description of Tamper Resistant Screws for the Engineers

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

No. 6: Thermal Cycling

Miniature Screws/Precision Screws Lineup List

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

Galling and Seizing

No. 6: Thermal Cycling

Increased degree of vacuum in equipment is required 【Productivity increase】

Select the best screws for your needs

Select Based on Application

Slip Torque of Coupling – Set Screw Type

Property of High Performance Stainless Steel Screws

Plastic Screw Property

Vol.4 What are washers used for?

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

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

Galling and Seizing

No. 6: Thermal Cycling

Increased degree of vacuum in equipment is required 【Productivity increase】

What is a Coupling? Explanation of Types and Characteristics

No. 2: Vacuum environments

Description of Tamper Resistant Screws for the Engineers

SEMS Screws: Efficiency and Convenience in Fastening

What are Hex Nuts?

Theft Prevention 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

What is a Coupling? Explanation of Types and Characteristics

Select Based on Application

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

Vol.6 Varieties of Screws "Beyond" SUS

A new generation of disk couplings

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

No. 6: Thermal Cycling

Miniature Screws/Precision Screws Lineup List

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

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

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）

No. 2: Vacuum environments

Description of Tamper Resistant Screws for the Engineers

Galling and Seizing

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

Miniature Screws/Precision Screws Lineup List

No. 2: Vacuum environments

Description of Tamper Resistant Screws for the Engineers

Galling and Seizing

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

No. 6: Thermal Cycling

Vol.4　What are washers used for?

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