Select the best screws for your needs

This page helps you select a product based on the application needs of your project.
Call or email us for any special needs not shown here.
Problems sloved with special screws!

Note: Values in charts are for reference only. They are not guaranteed values.

Vacuum   RENEWAL

  • Bolts with ventilation holes and washers with ventilation grooves support equipment vacuuming.

With ventilation hole/ventilation groove product 
Screws Screws
Washers Washers
Clamping Set Screws SCSS-VF, SCSS-VR
Clamping Cap Screws SCBS-VF, SCBS-VR
Miniature Ball Plungers PVFS
Hexagon Posts SHVAS, SHVBS

  • The surface of the screw head has been roughened with blasting to prevent the deposition from peeling off.



  product
Hex Socket Head Cap Screws with Special Low Profile
 - Head Shot Blast
SSHS-HB 

  • Aluminum alloy and ceramic cover caps prevent corrosion of bolts due to the process gas and plasma in the vacuum chamber.


  product
Cover Caps SCAP-AL, SCAP-CE 
Socket Head Cap Screws for Cover Caps  SNCPS  

  • Hardening the screw surface prevents screw seizing / sticking.
    Unlike platings or coatings, there is nothing adhering to the surface, eliminating concerns about contamination due to stripping during tightening.
    Suitable for preventing seizing and sticking in environments where lubricant cannot be used.

  product
Hex socket Head Cap Screws with Ventilation Hole /
Surface Hardening Treatment
SVSL-PN

Click here to see all Vacuum products

Low Outgas

  • Screws using material/surface treatment with low outgassing. Outgassing is extremely low even in vacuum environments.

VESPEL

Special Chemical Polish


Material and Surface Treatment product
Special Chemical Polish SVSS-PC
Stainless Steel Black  SNSS-BK  
Low temperature black chrome treatment  SNSS-RY  
VESPEL Vespel products
PEEK PEEK products

Click here to see all Low Outgas products

Cleanroom Specification

  • Screws are washed and packed in cleanrooms.

Particle Measurement Results
Specimen: SUS303 φ19 x 20
Test Method: Automatic Submerged Particle Counter Measurement


Number of Particles Floating in Ultrapure Water

Unit : pc

Particle Size  Ultrasonic Cleaning IPA Cleaning Unprocessed
 ≧0.3μm

 220,000

 7,000,000

 210,000,000

 ≧0.5μm

 51,000

 1,900,000

 37,000,000

 ≧0.7μm

 15,000

 640,000

 9,700,000

 ≧1.0μm

 3,100

 160,000

 1,400,000

 ≧2.0μm

 280

 29,000

 240,000

For details, refer to Cleanroom Wash & Packaging Service. ➡ Cleanroom Wash / Cleanroom Packing Service


Click here to see all Cleanroom Specification products

Chemical Resistance

  • Screws with excellent chemical resistance protect the thread and screw head from chemicals.

Hastelloy

PTFE(Teflon)

Metal's chemical resistance

Material Chemical Resistance  product
Hastelloy   Hastelloy products
Monel 400 Monel 400 products
Titanium Titanium products
Inconel Inconel products
SUS316L (HiMo) SNSX-88SNSX-109
SUS310S SNSJ, SHNJ, SWAJ-F

Resin's chemical resistance

Material Chemical Resistance product
PTFE(Teflon)   PTFE(Teflon) products
PVDF PVDF products
H-PVC H-PVC products
PP PP products
PEEK PEEK products

  • PTFE (Teflon) cover cap protects the screw head from chemicals.

  product
Cover Caps SCAP-AL, SCAP-CE 
Socket Head Cap Screws for Cover Caps  SNCPS  

  • Bolt head only has Teflon coating with excellent chemical resistance.

  product 
Hex head screw (Teflon coating for head) SNHS-HTF

Click here to see all Chemical Resistance products

Antireflection

  • Low temperature black chrome treatment/stainless steel black has a very low spectral reflectance, making it ideal for optical equipment that requires antireflection.

Hex Socket Head Cap Screw

Adjusting Washer

Special Surface Treated Screw Spectral Reflectance product
Stainless Steel Black  1.5% or less SNSS-BK,
SWAS-AWBK
Low temperature black chrome treatment  1.5% or less SNSS-RY

Click here to see all Antireflection products

Heat Resistance

  • These are highly heat‑resistant screws even for metal/resin.
    Select according to the operating environment.

Molybdenum

Material Tensile Strength(N/mm2 product 
200℃ 500℃   800℃  1000℃
SUS316L  560  500  250

 -

SNSL
SUS310S  580  500  200

 -

SNSJ
Inconel600  560  530  200

  70

SNSI
Molybdenum  590  450  290

 210

SNSM
Carbon Steel  450  230   40

 -

 -

SUS304  500  420  160

 -

 -

 

Material Continuous operating temperature(℃) product
Ceramic  1500 Ceramic products
VESPEL  288・350 Vespel products
PTFE(Teflon)  260 PTFE(Teflon) products

Click here to see all Heat Resistance products

Anti-Galling (Anti-Seize)

  • By reducing the friction coefficient of the threaded surface through plating and coating, the required axial force can be obtained even at low tightening torque. As a result, the generation of frictional heat in tightening can be suppressed, making it effective in preventing galling and seizing.
    >>Galling and Seizing

Gold Coating ・ Silver Plating ・ Low Temperature Black Chrome Treatment

Special Surface Treated Screw Axial Force(kN) product
Low temperature black chrome treatment 9.2 SNSS-RY
Teflon coating 8.7 SNSS-TF
Molybdenum disulfide coating 6.7 SNSS-MO
Fluorine coating 5 SNSS-FC
Gold coating 4.3 SNSS-AUS
No surface treatment 2.3

-

Stainless steel/M5/tightening torque: values measured at 5N·m.


  • Galling and seizing are prevented by curing the screw surface using NBK's own processing technology. There is nothing adhering to the surface, eliminating concerns about contamination due to stripping. Furthermore, it is effective in preventing galling and seizing even at high temperatures.

  product
SUS316L / Surface hardening treatment SNSL-PN

Click here to see all Anti-Galling(Anti-Seize) products

High Strength

  • Screws made of high‑strength titanium, stainless steel, resin and surface treatment.
    For applications that require strength in addition to the properties of the material and surface treatment.

Ti-6Al-4V(64Titanium)

Titanium screw Tensile Strength(N/mm2 product
Ti-6Al-4V(64Titanium) 895 or higher SNSTG
Ti-15-3-3-3(βTitanium) 705-945 SNPTG, SNFTG

Functional Stainless Steel Screw Tensile Strength(N/mm2 product
SUS316L HiMo 800・1000 SNSX-88,
SNSX-109

Plastic screw Tensile Strength(N/mm2 product
RENY 285 RENY products

Click here to see all High Strength products

Tightening Hole Damage Prevention

  • Hexalobular hole shape allows minimal damage from tools compared to hex hole or cross hole.
    It is ideal for repeated use at a high tightening torque.

Hexalobular Socket Head Cap Screws with Special Low Profile

Hexalobular Socket Pan Head Machine Screws

Hexalobular Socket Flat Head Machine Screws

  product
Hexalobular Socket Head Cap Screws
with Special Low Profile
SSTS
Hexalobular Socket Head Cap Screws
with Extreme Low Profile
SET-NI, SET-BNI, SETS
Hexalobular Socket Head Cap Screws
with Low Profile
SLT-TZB, SLTS
Hexalobular Socket Pan Head Machine Screws SNPXS
Hexalobular Socket Flat Head Machine Screws SNFXS

Click here to see all Tightening Hole Damage Prevention products

Non-magnetic

  • Non-magnetic screws with low permeability.
    For FPD manufacturing equipment, semiconductor manufacturing equipment and electronic equipment requiring non-magnetic properties.

Pure Titanium

Phospor Bronze

  Amplitude Permeability(μ) product
Pure Titanium  1.0001 SNST, SNPT, SNFT,
SHNT,SHNT-F, SWUT,
SWAT-F, SWAT-S
Phospor Bronze  1.0001 SNSP
Ti-6Al-4V(64Titanium)  1.0002 SNSTG
Ti-15-3-3-3(βTitanium)  1.0002 SNPTG, SNFTG
SUS316L  1.006 SNSL
SUS316 HiMo  1.007 SNSX-88, SNSX-109

Click here to see all Non-magnetic products

Electrical Insulation

  • Screws with excellent electrical insulation properties.
    For electrical and electronic equipment and the like requiring electrical insulating properties.

PEEK

PTFE(Teflon)

  Volume Resistivity
(×1014Ω・m)
product
PTFE(Teflon)  >100 PTFE(Teflon) products
PEEK  4.9 PEEK products
PC  4 PC products
Ceramic  >0.01 Ceramic products
Iron  10×10-8Ω・m

 -


Click here to see all Electrical Insulation products

Lightweight

  • For applications that require lighter weight such as automobiles, aircraft, aerospace equipment, medical equipment, robots, etc.

Pure Titanium

Aluminum

Metal Screw Specific Gravity product
Aluminum  2.64 SNSA
Ti-6Al-4V(64Titanium)  4.43 SNSTG
Pure Titanium  4.51 SNST, SNPT, SNFT,
SHNT,SHNT-F, SWUT,
SWAT-F, SWAT-S
Ti-15-3-3-3(βTitanium)  4.8 SNPTG, SNFTG
Iron  7.8

 -

 

Plastic Screw Specific Gravity product 
PC  1.2 PC products
RENY  1.65 RENY products

Click here to see all Lightweight products

Simple Operation

  • Screws with washers incorporated. They do not require washers to be embedded, simplifying the assembly.

Hex Socket Head Cap Screws with Captive Washer (with ventilation hole)

Hex Socket Head Cap Screws with Captive Washer (for magnetic detection)

Socket Button Head Cap Screws with Flange

  product
Hex Socket Head Cap Screws with Captive Washer and Ventilation Hole SVSQS
Hex Socket Head Cap Screws with Magnetic Captive Washer SNSQS-PM
Socket Button Head Cap Screws with Flange SFB, SFBS, SFB-EL

Click here to see all Simple Operation products

Space-saving  RENEWAL

  • Screws with low head. Suitable for reducing the size of equipment and devices.

Hex Socket Head Cap Screws with Special Low Profile

Low Head Screw product
Hex Socket Head Cap Screws with Ventilation Hole with Low Profile SVLS
Hex Socket Head Cap Screws with Low Profile SLH, SLH-TZB, SLHS,
SLHL
Hex Socket Head Cap Screws with Special Low Profile SSH, SSH-EL, SSHS,
SSHL, SSHS-FT, SSHT
Hexalobular Socket Head Cap Screws
with Low Profile
SSTS,SET-NI, SET-BNI,
SETS,  SLT-TZB, SLTS
Aluminum Hexalobular Socket Head Cap Screws
with Extreme Low Profile
SETA
Hex Head Screw / Special Low Head SNHS-LH
Hex Socket Head Cap Captive Screws
with Low Profile
SSCLS, SSCHS
Tamper Resistant Special Low Profile Cap Screws SRSHS
Cross Recessed Head Cap Screws with Extra Low Profile SEQ-TZB, SEQ-TBZ

Comparison of low-head and standard screw head heights       Unit : mm

Hex Socket Head Cap Screw
JIS B 1176 
Hex Socket Head Cap Screws
with Low Profile
Hex Socket Head Cap Screws
with Special Low Profile
Hexalobular Socket Head Cap Screws
with Extreme Low Profile
 M2  2  1.3   1.1  0.5
 M2.5  2.5  1.6  1.3  -
 M2.6  2.6  -  -  0.6
 M3  3  2  1.3  0.8
 M4  4  2.8  1.5  0.9
 M5  5  3.5  1.5  1
 M6  6  4  1.5  1.2
 M8  8  5  1.5  -
 M10  10  6  1.5  -


  • Screws with small head diameter.

Hex Socket Head Cap Screws with Small Head


Small Head Screw product
Cross Recessed Flat Head Machine Screws with Small Head SNF-SD-TZB
Hex Socket Head Cap Screws with Small Head SNS-SD, SNS-SD-EL
Hex Socket Head Cap Screws with Low and Small Head SLH-SD, SLH-SD-EL
Hex Socket Head Cap Screws with Extreme Low and Small Head SSH-SD, SSH-SD-EL

Comparison of small-head and standard screw head diameters  Unit : mm

Hex Socket Head Cap Screw
JIS B 1176 
Hex Socket Head Cap Screws
with Small Head
 M2  3.8  3
 M2.5  4.5  3.8
 M3  5.5  4.5
 M4  7  5.5
 M5  8.5  7
 M6  10  8.5
 M8  13  11
 M10  16  13.5


  • Small-diameter screws of M2.6 or less.

Pan Head Machine Screws for Precision Instruments




Resin Screws
(PEEK / small countersunk screws for precision equipment)






Set Screws for Precision Instruments

Theft Prevention  RENEWAL

  • This prevents mounting and removing with commercial screwdrivers or wrenches. Dedicated tools are required for these screws, providing effective theft prevention.

Triwing Pan Head Machine Screws

Flat Head Bolts with Hexalobular Socket (with Pin)
               Rosette Washer Set

  product
Tamper Resistant Special Low Profile Cap Screws SRSHS
Flat Head Bolts with Hexalobular Socket (with Pin)
Rosette Washer Set
SRFXS-SET
Button Head Cap Screws (with Pin) SRBS,SRHS
Two Hole Pan Head Machine Screws SRTS
Triwing Pan Head Machine Screws SRWS
Button Head Cap Screws with Five-Lobe Holes (with Pin) SRGS


  • Theft prevention nuts and one-sided pan-head screws can be mounted using commercially available tools. Crime can be prevented without compromising the workability of mounting.

Theft Prevention Nuts


One Side Pan Head Machine Screws

  product
Theft Prevention Nuts SHNRS
One Side Pan Head Machine Screws SROS


Click here to see all Theft Prevention products

Fixing and Positioning

  • Clamping bolts, ball plungers, etc. suitable for fixing and positioning.

Clamping Screws with Eccentric Head

Clamping Screws

Clamping Bolts

Miniature Ball Plungers


  • For fixing linear guideway rails and workpieces that can be easily damaged.



  product
Clamping Set Screws with Ventilation Hole SCSS-VR, SCSS-VF
Clamping Cap Screws with Ventilation Hole SCBS-VR, SCBS-VF
Spring Plungers with Ball with Ventilation Hole PVFS
Clamping Screws with Eccentric Head Clamping Screws with Eccentric Head products
Hex Socket Head Cap Screws - Fine Pitch Thread SNSS-M-P

Click here to see all Fixing and Positioning products

Fallout/Loss Prevention

  • Screws and washers suitable for screw fallout prevention. For CE Marking compatibility.

Hex Socket Head Cap Captive Screws

  product
Hex Socket Head Cap Captive Screws SSC, SSC(INCH)
Cross Recessed Pan Head Captive Machine Screws SSCPS
Cross Recessed Truss Head Captive Screws SSCMS
Hex Socket Head Cap Captive Screws with Low Profile SSCLS
Hex Socket Head Cap Captive Screws with Special Low Profile SSCHS

  • Captive processing service is available to provide screws with relief cut and fallout prevention functions.

product
Captive Processing Service


  • Since a flat washer is incorporated into the screw, the washer will not be lost. Furthermore, the magnetic detection type has a built-in magnetic flat washer, allowing magnetism detection.

Hex Socket Head Cap Screws
with Captive Washer and Ventilation Hole

Hex Socket Head Cap Screws
with Magnetic Captive Washer

  product
Hex Socket Head Cap Screws with Captive Washer and Ventilation Hole SVSQS
Hex Socket Head Cap Screws with Magnetic Captive Washer SNSQS-PM


Click here to see all Fallout/Loss Prevention products

Vibration Resistant

  • Screw components highly effective for prevention of screw loosening due to vibration or seating surface falling.

Ribbed Lock Washers

Hex Lock Nuts

Socket Button Head Cap Screws with Flange

 

  product
Socket Button Head Cap Screws with Flange SFB, SFBS
Hex Lock Nuts - Titanium SWUT
Ribbed Lock Washers SWR, SWRS
Seal Washers SWS, SWS-F
High Intensity Flat Washers SWF
Hex Lock Nuts SWUS

In addition to the above products, an anti-loosening service for screws is available. ➡ Vibration Resistant Treatment Service


  • Prevents screw loosening with eccentric lock washers in combination with commercially available hex nuts.
Video displays Junker and NAS vibration tests, demonstrating high loosening-prevention performance.  ➡  watch a video

Eccentric Lock Washers

  product
Eccentric Lock Washers SWAS-EW

Click here to see all Vibration Resistant products

Female Thread Reinforcing  NEW

  • A keyed female-thread reinforcing insert. It is ideal for reinforcing female threads in light metals such as aluminum, castings, or resin, as well as for repairing damaged female threading.
  • With high strength compared to coil-type inserts, it is usable for firm fastening or in areas where bolts are frequently fastened and removed.


   Product
 Keyed Female-Thread Reinforcing Insert  SHINS

Mounting is even easier than with coil-type inserts.
Use the dedicated tool SKK.

Prevention of air/liquid leakage

  • Plugs and seal washers prevent leakage of gas or liquid.

Hex Socket Flange Head Screw Plugs


Seal Washers

  product
Plugs products list
Locking and Sealing Rings SWH,SWC
Seal Washers SWS

Decoration  RENEWAL

  • The mounting surface has been beautifully decorated with a distinctive color and shape.

Bezel Washers

Two Hole Pan Head Machine Screws

Gold Coating

Hexalobular Socket Head Cap Screws
with Extreme Low Profile

  product
Stainless Steel Black SNSS-BK,
SWAS-AWBK
Special Low Profile Cap Screws SSH, SSH-EL,
SSHS, SSHL,
SSHS-FT, SSHT
Hexalobular Socket Head Cap Screws with Extreme Low Profile SET-NI, SET-BNI, SETS
Gold coating SNSS-AUS
Two Hole Pan Head Machine Screws SRTS
Button Head Cap Screws with Five-Lobe Holes (with Pin) SRGS
Plastic Screws - Cross Recessed Pan Head Machine Screws - PC SPC-P
Rosette Washers SWAS-RW

Click here to see all Decoration products

Consult us if you have any questions.

Note: 60% of special screw purchase orders to NBK are for special screws not listed in this catalog. Many unique customization requests may be possible.

Customer Service

  • Usage Method
  • Technical Question
  • Customization Products
USA and Canada

NBK America LLC

9:00 to 17:00 on weekdays, Eastern Standard Time

Asia and Europe

Nabeya Bi-tech Kaisha

8:00 to 17:00 on weekdays, Japan Standard Time