Galling & Seizing Prevention

These screws have surface treatments that prevent galling during tightening.
By reducing the friction coefficient of the thread surfaces with plating or coatings, the required axial force can be achieved with lower tightening torque.
As a result, he generation of friction heat during tightening is minimized, effectively preventing galling and seizing.
There are surface-hardened screws that do not cause contamination, as well as screws with gold, fluorine, MoS2, and PTFE coatings.

GallingSeizingPrevention1en1

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Part Name	Hex Socket Head Cap Screws - SUS316L / Surface hardening treatment	High Strength Stainless Steel Socket Head Cap Screws - Surface Hardening	Hex Socket Head Cap Screws - Fluorine Coating	Socket Head Cap Screws with Small Head - Fluorine Coating	Socket Head Cap Screws with Ultra Low Profile & Small Head - Fluorine Coating	Hex Socket Head Cap Screws - MoS₂ Coating	Socket Head Cap Screws with Small Head - MoS₂ Coating	Socket Head Cap Screws with Ultra Low Profile & Small Head - MoS₂ Coating	Hex Socket Head Cap Screws - Low Temperature Black Chrome
Part Number	SNSL-PN	SNSLG-PN	SNSS-FC	SNSS-SD-FC	SSHS-SD-FC	SNSS-MO	SNSS-SD-MO	SSHS-SD-MO	SNSS-RY
Feature	Seizing Prevention	High Strength (Strength Class 10.8 Equivalent) Heat Resistance Seizing Prevention	Seizing prevention	Small Head Space-saving Seizing Prevention	Special Low Profile Small Head Space-saving Seizing Prevention	Seizing prevention	Small Head Space-saving Seizing Prevention	Special Low Profile Small Head Space-saving Seizing Prevention	Chemical Resistance Reflection Resistance Seizing Prevention
Material	SUS316L	SUS316L	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)
Surface Treatment	Surface hardening treatment	Surface hardening treatment	Fluorine coating	Fluorine coating	Fluorine coating	Molybdenum disulfide coating	Molybdenum disulfide coating	Molybdenum disulfide coating	Low temperature black chrome treatment
Thread Size	M3 ～ M8	M3 ～ M6	M3 ～ M10	M3 ～ M10	M3 ～ M10	M3 ～ M10	M3 ～ M10	M3 ～ M10	M3 ～ M10
Operating Temperature (℃)	-	-	-	-	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	SNSL-M3-PN SNSL-M4-PN SNSL-M5-PN SNSL-M6-PN SNSL-M8-PN	SNSLG-M3-PN SNSLG-M4-PN SNSLG-M5-PN SNSLG-M6-PN	SNSS-M10-FC SNSS-M3-FC SNSS-M4-FC SNSS-M5-FC SNSS-M6-FC SNSS-M8-FC	SNSS-M10-SD-FC SNSS-M3-SD-FC SNSS-M4-SD-FC SNSS-M5-SD-FC SNSS-M6-SD-FC SNSS-M8-SD-FC	SSHS-M10-SD-FC SSHS-M3-SD-FC SSHS-M4-SD-FC SSHS-M5-SD-FC SSHS-M6-SD-FC SSHS-M8-SD-FC	SNSS-M10-MO SNSS-M3-MO SNSS-M4-MO SNSS-M5-MO SNSS-M6-MO SNSS-M8-MO	SNSS-M10-SD-MO SNSS-M3-SD-MO SNSS-M4-SD-MO SNSS-M5-SD-MO SNSS-M6-SD-MO SNSS-M8-SD-MO	SSHS-M10-SD-MO SSHS-M3-SD-MO SSHS-M4-SD-MO SSHS-M5-SD-MO SSHS-M6-SD-MO SSHS-M8-SD-MO	SNSS-M10-RY SNSS-M3-RY SNSS-M4-RY SNSS-M5-RY SNSS-M6-RY SNSS-M8-RY

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Part Name	Flanged Socket Head Cap Screws - Low Temperature Black Chrome Treatment	High Strength Stainless Steel Socket Head Cap Screws – Low Temperature Black Chrome Treatment	Hex Socket Head Cap Screws - PTFE Coating	Flanged Socket Head Cap Screws - PTFE Coating	High Strength Stainless Steel Socket Head Cap Screws – PTFE Coating	Hex Socket Head Cap Screws - Gold Coating	Socket Head Cap Captive Screws - Fluorine Coating	Socket Head Cap Captive Screws - Low Temperature Black Chrome Treatment	Socket Head Cap Captive Screws - PTFE Coating
Part Number	SFSS-RY	SNSLG-RY	SNSS-TF	SFSS-TF	SNSLG-TF	SNSS-AUS	SSC-FC	SSC-RY	SSC-TF
Feature	Flanged Chemical Resistance Anti-reflection Seizing Prevention	High Strength (Strength Class 10.8 Equivalent) Non-magnetic Chemical Resistance Anti-reflection Seizing Prevention	Chemical Resistance Seizing Prevention	Flanged Chemical Resistance Seizing Prevention	High Strength (Strength Class 10.8 Equivalent) Non-magnetic Chemical Resistance Seizing Prevention	Seizing prevention	Seizing Prevention Captive / Loss Prevention	Chemical Resistance Anti-reflection Seizing Prevention Captive / Loss Prevention	Chemical Resistance Seizing Prevention Captive / Loss Prevention
Material	SUSXM7 (Equivalent to SUS304)	SUS316L	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUS316L	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)
Surface Treatment	Low temperature black chrome treatment	Low temperature black chrome treatment	PTFE coating	PTFE coating	PTFE coating	Gold Coating (Gold Purity: 99.99 wt%)	Fluorine coating	Low temperature black chrome treatment	PTFE coating
Thread Size	M4 ～ M8	M3 ～ M6	M3 ～ M10	M4 ～ M8	M3 ～ M6	M3 ～ M10	M3 ～ M8	M3 ～ M8	M3 ～ 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-RY SFSS-M5-RY SFSS-M6-RY SFSS-M8-RY	SNSLG-M3-RY SNSLG-M4-RY SNSLG-M5-RY SNSLG-M6-RY	SNSS-M10-TF SNSS-M3-TF SNSS-M4-TF SNSS-M5-TF SNSS-M6-TF SNSS-M8-TF	SFSS-M4-TF SFSS-M5-TF SFSS-M6-TF SFSS-M8-TF	SNSLG-M3-TF SNSLG-M4-TF SNSLG-M5-TF SNSLG-M6-TF	SNSS-M10-AUS SNSS-M3-AUS SNSS-M4-AUS SNSS-M5-AUS SNSS-M6-AUS SNSS-M8-AUS	SSC-M3-FC SSC-M4-FC SSC-M5-FC SSC-M6-FC SSC-M8-FC	SSC-M3-RY SSC-M4-RY SSC-M5-RY SSC-M6-RY SSC-M8-RY	SSC-M3-TF SSC-M4-TF SSC-M5-TF SSC-M6-TF SSC-M8-TF

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Part Name	Hex socket Head Cap Screws with Ventilation Hole / Surface Hardening Treatment	Vented High Strength Stainless Steel Socket Head Cap Screws – Surface Hardening	Socket Head Cap Screws with Ventilation Hole - MoS₂ Shot	Socket Head Cap Screws with Ventilation Hole - Silver Plating	Vented High Strength Stainless Steel Socket Head Cap Screws – Silver Plating
Part Number	SVSL-PN	SVSLG-PN	SVSS-MOS	SVSS-AG	SVSLG-AG
Feature	Seizing prevention	High Strength (Strength Class 10.8 Equivalent)	Seizing prevention	Seizing prevention	High Strength (Strength Class 10.8 Equivalent)
Material	SUS316L	SUS316L	SUSXM7 (Equivalent to SUS304)	SUSXM7 (Equivalent to SUS304)	SUS316L
Surface Treatment	Surface hardening treatment	Surface hardening treatment	Molybdenum Disulfide Shot Treatment	Silver plating	Silver plating
Thread Size	M3 ～ M8	M3 ～ M6	M3 ～ M8	M3 ～ M8	M3 ～ M6
Operating Temperature (℃)	-	-	-	-	-
CAD	CAD	CAD	CAD	CAD	CAD
Specifications	Specifications	Specifications	Specifications	Specifications	Specifications
List	SVSL-M3-PN SVSL-M4-PN SVSL-M5-PN SVSL-M6-PN SVSL-M8-PN	SVSLG-M3-PN SVSLG-M4-PN SVSLG-M5-PN SVSLG-M6-PN	SVSS-M3-MOS SVSS-M4-MOS SVSS-M5-MOS SVSS-M6-MOS SVSS-M8-MOS	SVSS-M3-AG SVSS-M4-AG SVSS-M5-AG SVSS-M6-AG SVSS-M8-AG	SVSLG-M3-AG SVSLG-M4-AG SVSLG-M5-AG SVSLG-M6-AG

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