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Hardlock Products

Distributor of Hardlock Products

When you need fail safe fastening performance in the most demanding, high-vibration applications, trust Hardlock Nuts to meet or exceed your expectations. Fasteners Plus is an authorized distributor of the entire range of Hardlock Nuts.


The innovative wedge-principle design of these nuts prevents them from loosening even when they are subjected to high vibrations over extended periods of time. From railways to radars to bridges to towers to wind turbines to electric equipment, Hardlock Nuts continue to provide 100% secure connections in hundreds of applications.


These vibration proof fasteners are available in a myriad of sizes, classified from M6 to M64 making them suitable for the smallest of fastening jobs to large scale ones

Hardlock Nut
Hardlock Bearing Nut
Hardlock Set Screw

Hard Lock Nuts – Tested For Strength and Durability

The entire range of nuts has been subjected to a battery of impact and vibration tests to ensure that they delivery infallible performance for years. They have met the requirements of the NAS3350 and 3354 National Aerospace Standard. Each component is made using high-grade materials to resist corrosion and wear


Ease of Installation


The exceptionally tight connections offered by these nuts might mislead you into thinking that they require elaborate installation procedures. On the contrary, the entire range of Hard Lock Nuts has been designed such that you need just a spanner wrench for installation. It takes a few minutes to put the nuts and bolts into place and experience their high anti-loosening effect. Besides, you no longer have to worry about the high labor costs associated with re-tightening.

Hardlock Nut

Available in:

Class 4 (JIS SS400 equivalent); CR3(Zinc Plated) or HDZ35(Galvanized)


Class 8 (JIS S45C(H)); MP(Magnesium Phosphate) or CR3(Zinc Plated)


A2 (JIS SUS304 equivalent); Plain

Part No.SizePitch
HLN-R 5CM50.8
HLN-R 6CM61.0
HLN-R 8CM81.25
HLN-R 10CM101.5
HLN-R 12CM121.75
HLN-R 16CM162.0
HLN-R 20CM202.5
HLN-R 22CM222.5
HLN-R 24CM243.0
HLN-R 27CM273.0
HLN-R 30CM303.5

Hardlock Bearing Nut

Available in:

Class 4 (JIS SS400 equivalent); MP(Magnesium Phosphate)


Class 8 (JIS S45C(H)); MP(Magnesium Phosphate)


A2 (JIS SUS304 equivalent); Plain

Part No.Size (dxp)Part No.Size (dxp)
HLB01M12 X 1.0HLB11M55 X 2.0
HLB02M15 X 1.0HLB12M60 X 2.0
HLB03M17 X 1.0HLB13M65 X 2.0
HLB04M20 X 1.0HLB14M70 X 2.0
HLB05M25 X 1.5HLB15M75 X 2.0
HLB06M30 X 1.5HLB16M85 X 2.0
HLB07M35 X 1.5HLB17M80 X 2.0
HLB08M40 X 1.5HLB18M90 X 2.0
HLB09M45 X 1.5HLB19M95 X 2.0
HLB10M50 X 1.5HLB20M100 X 2.0

Hardlock Set Screw

Normal Type Available in:

Class 10 (JIS SCM435); Black Oxide


Class 8 (JIS S45C(H)); Black Oxide


Hollow Type Available in:

Class 8 (JIS S45C(H)); Black Oxide

SizePitchNormal Type Part No. (Class 10; JIS SCM435 Black Oxide)Normal Type Part No. (Class 8; JIS S45C Black Oxide)Hollow Type Part No. (Class 8; JIS S45C Black Oxide)
M81.25HLS8AC –  – 
M101.5HLS10AC –  – 
M121.75HLS12AC – HLS12BC
M142.0HLS14AC – HLS14BC
M162.0HLS16AC – HLS16BC
M182.5HLS18AC –  – 
M202.5HLS20AC – HLS20BC
M222.5HLS22AC –  – 
M243.0 – HLS24ACHLS24BC
M303.5 – HLS30ACHLS30BC
M364.00 – HLS36ACHLS36BC

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