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Single Chamfer (Type 1) & Double Chamfer (Type 2) U-NUT

Standard Locknuts

FUJILOK U-NUT
Dimensional Charts and Tightening Torque Charts
  • Single Chamfer (Type 1) & Double Chamfer (Type 2) U-NUT
  • Thin Type (Type 3) U-NUT
  • Small Type U-NUT
  • Cap Type U-NUT
  • Flange Type U-NUT
  • Flange Type U-NUT (Stainless Steel)
  • Weld Type U-NUT
  • Whitworth Thread Type U-NUT
  • Unified Thread Type U-NUT

Features

  • Standard FUJILOK U-NUT
  • Type 1 = Single chamfer
  • Type 2 = Double chamfer

General names

Locknut

Video of features

Dimensional Charts

Single Chamfer (Type 1) & Double Chamfer (Type 2) U-NUT
Dimensional Chart

●Available

Thread Accuracy: JIS6H(Class 2)  Unit:mm

Material of the Nut Body SS400 S45C (thermal refined) SUS304 Unit
Weight
(g)
Approx.
Material of the Friction Ring SUS301
Nominal
Diameter
(d)		 Pitch
(p)		 Width Across Flat
(s)		 Overall Height
(h)		 Thread
Height
(m)
Approx.		 Across
Corners
(e)
Approx.		 Single
Chamfer
(Type 1)		 Double
Chamer
(Type 2)		 Double
Chamfer
(Type 2)		 Single
Chamfer
(Type 1)
Base Tolerance Base Tolerance
M3 0.5 5.5
0   
-0.2 		 3.2 ±0.3 2.7 6.4 　 ● 　 ● 0.4
M4 0.7 7.0 3.8 3.0 8.1 　 ● 　 ● 0.8
M5 0.8 8.0 4.6 3.9 9.2 　 ● ● ● 1.2
M6 1 10.0 5.1 4.2 11.5 　 ● ● ● 2.1
M8 1.25 13.0
0   
-0.25		 7.3 ±0.4 6.1 15.0 　 ● ● ● 5.1
1 　 ● ● ●
M10 1.5 17.0 8.3 7.1 19.6 　 ● ● ● 10.0
1.25 　 ● ● ●
M12 1.75 19.0
0    
-0.35		 10.5 9.0 21.9 　 ● ● ● 15.2
1.5 　 ● ● ●
1.25 　 ● ● ●
M14 2 22.0 12.5 ±0.5 11.0 25.4 ● 　 ● ● 24.0
1.5 ● 　 ● ●
M16 2 24.0 14.5 13.0 27.7 ● 　 ● ● 31.5
1.5 ● 　 ● ●
M18 2.5 27.0 16.0 14.0 31.2 ● 　 ● ● 45.2
1.5 ● 　 ● ●
M20 2.5 30.0 17.5 15.4 34.6 ● 　 ● ● 61.4
1.5 ● 　 ● ●
M22 2.5 32.0
0   
-0.4 		 19.5 ±0.6 17.2 37.0 ● 　 ● ● 74.3
1.5 ● 　 ● ●
M24 3 36.0 21.5 18.8 41.6 ● 　 ● ● 108.0
2 ● 　 ● ●
M27 3 41.0 24.0 21.2 47.3 ● 　 ● ● 159.0
M30 3.5 46.0 27.0 ±0.8 24.0 53.1 ● 　 ● ● 226.0
3 ● 　 ● ●
M33 3.5 50.0 29.5 26.5 57.7 ● 　 ● ● 287.0
3 ● 　 ● 　
M36 4 55.0
0    
-0.45		 32.5 ±1 29.5 63.5 ● 　 ● ● 393.0
3 ● 　 ● ●
M39 4 60.0 35.0 31.8 69.3 ● 　 ● ● 509.0
3 ● 　 ● 　
M42 4.5 65.0 38.0 ±1.5 34.5 75.0 ● 　 ● ● 651.0
3 ● 　 ● 　
M45 4.5 70.0 40.0 36.0 80.8 ● 　 ● ● 794.0
3 36.5 ● 　 ● 　
M48 5 75.0 42.0 38.0 86.5 ● 　 ● ● 972.0
3 ● 　 ● 　
M52 5 80.0 46.0 ±2 42.0 92.4 ● 　 ● 　 1,190.0
3 ● 　 ● 　
M55 3 85.0
0    
-0.55		 49.0 44.5 98.1 ● 　 ● 　 1,360.0
M56 5.5 ● 　 ● 　 1,410.0
4 45.0 ● 　 ● 　
M60 5.5 90.0 52.0 47.5 104.0 ● 　 ● 　 1,660.0
4 48.0 ● 　 ● 　
M64 6 95.0 54.0 50.0 110.0 ● 　 ● 　 1,910.0
4 ● 　 ● 　
*Please contact us for the presence or absence of a left-hand thread.
*Please check the stock condition of each size.
*The material also includes items with equivalent materials.
*Dimensions may change for improvement.
Please feel free to contact us for sizes, shapes, and materials that are not listed.

Reference Tightening Torque Charts

Single Chamfer (Type 1) & Double Chamfer (Type 2) U-NUT Material of the Nut Body SS400
Reference Tightening Torque Chart

The tightening torques in the table below are reference values based on the bolt surface treatment and strength grade.

Unit：Ｎ・ｍ

Surface Treatment Plain Electro-galvanizing Hot-dip galvanizing Coating
Nominal Diameter Pitch(mm) Strength Grade:4.8 Strength Grade:4.8 Strength Grade:4.8
M3 0.5 0.8 0.9 ー
M4 0.7 1.8 2.2 ー
M5 0.8 3.7 4.4 ー
M6 1 6.3 7.4 ー
M8 1.25 15.0 18.0 23.0
1 16.0 19.0 ー
M10 1.5 30.0 36.0 45.0
1.25 32.0 38.0 ー
M12 1.75 53.0 62.0 79.0
1.5 55.0 65.0 ー
1.25 57.0 68.0 ー
M14 2 84.0 99.0 125.0
1.5 91.0 105.0 ー
M16 2 130.0 155.0 195.0
1.5 140.0 165.0 ー
M18 2.5 180.0 210.0 270.0
1.5 200.0 240.0 ー
M20 2.5 255.0 300.0 385.0
1.5 280.0 335.0 ー
M22 2.5 345.0 410.0 520.0
1.5 380.0 450.0 ー
M24 3 440.0 520.0 660.0
2 480.0 565.0 ー
M27 3 640.0 760.0 970.0
M30 3.5 880.0 1,040.0 1,320.0
3 905.0 1,070.0 ー
M33 3.5 1,190.0 1,410.0 1,800.0
3 1,230.0 1,450.0 ー
M36 4 1,530.0 1,810.0 2,310.0
3 1,620.0 1,920.0 ー
M39 4 1,980.0 2,340.0 2,980.0
3 2,090.0 2,470.0 ー
M42 4.5 2,450.0 2,900.0 3,690.0
3 2,640.0 3,130.0 ー
M45 4.5 3,070.0 3,630.0 4,620.0
3 3,280.0 3,880.0 ー
M48 5 3,670.0 4,350.0 5,530.0
3 3,990.0 4,730.0 ー
M52 5 4,760.0 5,640.0 7,180.0
3 5,140.0 6,090.0 ー
M55 3 6,120.0 7,250.0 ー
M56 5.5 5,910.0 7,000.0 8,910.0
4 6,230.0 7,380.0 ー
M60 5.5 7,360.0 8,720.0 11,100.0
4 7,740.0 9,170.0 ー
M64 6 8,920.0 10,550.0 13,450.0
4 9,480.0 11,240.0 ー
The most suitable tightening torque varies depending on the customer.
If you have any questions about the size and usage conditions, please contact us.

Single Chamfer (Type 1) & Double Chamfer (Type 2) U-NUT Material of the Nut Body S45C
Reference Tightening Torque Chart

The tightening torques in the table below are reference values based on the bolt surface treatment and strength grade.
The reference tightening torque for hot-dip galvanizing is a reference value based on nut surface treatment and strength classification.

Unit：Ｎ・ｍ

Surface Treatment Plain Electro-galvanizing Hot-dip galvanizing Coating
Nominal Diameter Pitch(mm) Strength Grade:8.8 Strength Grade:8.8 Strength Grade:8.8
M5 0.8 7.4 8.7 ー
M6 1 13.0 15.0 ー
M8 1.25 30.0 36.0 35.0
1 33.0 39.0 ー
M10 1.5 60.0 71.0 70.0
1.25 64.0 75.0 ー
M12 1.75 105.0 125.0 120.0
1.5 110.0 130.0 ー
1.25 115.0 135.0 ー
M14 2 165.0 200.0 195.0
1.5 180.0 215.0 ー
M16 2 260.0 310.0 300.0
1.5 280.0 330.0 ー
M18 2.5 360.0 425.0 410.0
1.5 405.0 480.0 ー
M20 2.5 510.0 600.0 580.0
1.5 565.0 670.0 ー
M22 2.5 690.0 820.0 800.0
1.5 760.0 900.0 ー
M24 3 880.0 1,040.0 1,010.0
2 960.0 1,140.0 ー
M27 3 1,290.0 1,530.0 1,480.0
M30 3.5 1,750.0 2,070.0 2,020.0
3 1,810.0 2,150.0 ー
M33 3.5 2,380.0 2,820.0 2,750.0
3 2,460.0 2,910.0 ー
M36 4 3,060.0 3,620.0 3,530.0
3 3,240.0 3,840.0 ー
M39 4 3,960.0 4,690.0 4,570.0
3 4,180.0 4,950.0 ー
M42 4.5 4,890.0 5,800.0 5,650.0
3 5,290.0 6,260.0 ー
M45 4.5 6,130.0 7,260.0 7,080.0
3 6,550.0 7,760.0 ー
M48 5 7,340.0 8,690.0 8,470.0
3 7,990.0 9,460.0 ー
M52 5 9,520.0 11,300.0 ー
3 10,300.0 12,150.0 ー
M55 3 12,250.0 14,500.0 ー
M56 5.5 11,800.0 14,000.0 13,650.0
4 12,450.0 14,750.0 ー
M60 5.5 14,750.0 17,450.0 17,000.0
4 15,500.0 18,350.0 ー
M64 6 17,850.0 21,150.0 20,600.0
4 18,950.0 22,450.0 ー
The most suitable tightening torque varies depending on the customer.
If you have any questions about the size and usage conditions, please contact us.

Single Chamfer (Type 1) & Double Chamfer (Type 2) U-NUT Material of the Nut Body SUS304
Reference Tightening Torque Chart

Unit：Ｎ・ｍ

Surface Treatment Plain
Bolt
Nominal Diameter Pitch(mm) Stainless Steel
Proof Stress 300N/㎟		 Strength Grade 50
210N/㎟		 Strength Grade 70
450N/㎟
M3 0.5 0.8 0.6 1.2
M4 0.7 1.9 1.3 2.8
M5 0.8 3.8 2.7 5.8
M6 1 6.5 4.6 9.8
M8 1.25 16.0 11.0 24.0
1 17.0 12.0 25.0
M10 1.5 31.0 22.0 47.0
1.25 33.0 23.0 50.0
M12 1.75 55.0 38.0 82.0
1.5 57.0 40.0 86.0
1.25 60.0 42.0 90.0
M14 2 87.0 61.0 130.0
1.5 95.0 66.0 140.0
M16 2 135.0 95.0 205.0
1.5 145.0 100.0 215.0
M18 2.5 185.0 130.0 ー
1.5 210.0 145.0 ー
M20 2.5 265.0 185.0 ー
1.5 295.0 205.0 ー
M22 2.5 360.0 250.0 ー
1.5 395.0 275.0 ー
M24 3 455.0 320.0 ー
2 495.0 350.0 ー
M27 3 670.0 470.0 ー
M30 3.5 910.0 635.0 ー
3 940.0 660.0 ー
M33 3.5 1240.0 865.0 ー
M36 4 1590.0 1,110.0 ー
3 1680.0 1,180.0 ー
M39 4 2060.0 1,440.0 ー
M42 4.5 2540.0 1,780.0 ー
M45 4.5 3180.0 2,230.0 ー
M48 5 3810.0 2,670.0 ー
The most suitable tightening torque varies depending on the customer.
If you have any questions about the size and usage conditions, please contact us.

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