FSW U-NUT
An integrated the FUJILOK U-NUT and washer unit
Features
- An integrated the FUJILOK U-NUT and washer unit
- Reduces the number of components
- Makes construction easy and reduces costs
- Can also be used for anchor bolts
- Protects the surface treatment of the object the nut is being fastened onto
- Suitable for slotted holes and clearance holes
- Vibration impact tested in accordance with NAS3350
General names
Washer nut
Video of features
Applicable markets
- Two-wheeled vehicles
- Four-wheeled vehicles
- Special-equipped vehicles
- Farm equipment
- Conveyers
- Railways
- Marine vessels
- Plants
- Machine tools
- Industrial equipment
- Electronics
- Medical care and welfare
- Infrastructure
- Civil engineering
- Architecture
- Playground equipment
Basic Information
Specs
Applications | ・Anti-loosening measures for anchor bolts ・Fixing support brackets for various cables ・Tunnel lighting installation work ・Pipe fitting installation work |
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Thread accuracy | JIS6H (JIS Class 2) |
Sizes | SS M8~M16 SUS M6~M16 *Pitch: Coarse thread |
Materials | SS400 or equivalent, SUS304 or equivalent |
Surface treatments | Hot-dip Galvanizing Coating(SS400 or equivalent only) |
Dimensional Charts and Reference Tightening Torque Charts
FSW U-NUT Mateial of the Nut Body SS400 Hot-dip Galvanizing Coating
Dimensional Chart and Reference Tightening Torque Chart
Material of the Nut Body | SS400 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Material of the Friction Ring | SUS301 | |||||||||||
Material of the Washer | SPCC | |||||||||||
Surface treatment | Hot-dip Galvanizing Coating | |||||||||||
Nominal Diameter (d) |
Pitch (p) |
Width Across Flat (s) |
Flange Diameter (φdc) |
Overall Height (h1) |
U-NUT Height (h2) Approx. |
Across Corners (e) Approx. |
Washer Thickness (c) Approx. |
Unit Weight (g) Approx. |
Reference Tightening Torque(N・m) Bolt Strength Grade:4.8 Surface treatment: Hot-dip Galvanizing Coating |
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Base | Tolerance | Base | Tolerance | Base | Tolerance | |||||||
M8 | 1.25 | 13 | 0 -0.25 |
22 | 0 -0.52 |
9.3 | +1.0 -0.5 |
7.3 | 15.0 | 2.0 | 9.2 | 23.0 |
M10 | 1.5 | 17 | 26 | 10.8 | 8.3 | 19.6 | 2.5 | 17.6 | 45.0 | |||
M12 | 1.75 | 19 | 0 -0.35 |
32 | 0 -0.62 |
13.5 | 10.5 | 21.9 | 3.0 | 29.3 | 79.0 | |
M16 | 2 | 24 | 38 | 17.5 | 14.5 | 27.7 | 3.0 | 50.6 | 195.0 |
FSW U-NUT Mateial of the Nut Body SUS304
Dimensional Chart and Reference Tightening Torque Chart
Material of the Nut Body/Material of the Washer | SUS304 | Reference Tightening Torque(N・m) | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Material ofthe Friction Ring | SUS301 | Bolt | ||||||||||||
Nominal Diameter (d) |
Pitch (p) |
Width Across Flat (s) |
Flange Diameter (φdc) |
Overall Height (h1) |
U-NUT Height (h2) Approx. |
Across Corners (e) Approx. |
Washer Thickness (c) Approx. |
Unit Weight (g) Approx. |
Stainless Steel Proof Stress 300N/㎟ |
Strength Grade 50 210N/㎟ |
Strength Grade 70 450N/㎟ |
|||
Base | Tolerance | Base | Tolerance | Base | Tolerance | |||||||||
M6 | 1 | 10 | 0 -0.2 |
17 | 0 -0.4 |
6.5 | ±0.4 | 5.1 | 11.5 | 1.0 | 3.5 | 6.5 | 4.6 | 9.8 |
M8 | 1.25 | 13 | 0 -0.25 |
20 | 9.2 | ±0.5 | 73.0 | 15.0 | 1.4 | 7.9 | 16.0 | 11.0 | 24.0 | |
M10 | 1.5 | 17 | 24 | 10.6 | 83.0 | 19.6 | 1.8 | 14.6 | 31.0 | 22.0 | 47.0 | |||
M12 | 1.75 | 19 | 0 -0.35 |
28 | 13.5 | 10.5 | 21.9 | 2.3 | 21.5 | 55.0 | 38.0 | 82.0 | ||
M16 | 2 | 24 | 34 | 0 -0.5 |
18.0 | ±0.6 | 14.5 | 27.7 | 2.5 | 45.6 | 135.0 | 95.0 | 205.0 |
Surface treatments
Precautions for Use
This product is used for fastening parts that are especially important.
Please observe the following rules when using this product.
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Use bolts that have a chamfered tip with JIS6g (Class 2) thread accuracy.
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Please refer to the reference tightening torque chart when tightening nuts.
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Use lubricant if there is a risk of galling or sticking when screwing on or unscrewing nuts.
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To fully demonstrate the locking function of the FUJILOK U-NUT, make sure that at least two full bolt threads come out of the friction ring.
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Consult us if you are working with bolts with threads that have been machined (with keyways, pin holes, etc.).
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Use impact wrenches at a medium or lower rotating speed.
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The nut cannot be screwed on from the friction ring side.
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Stop using the FUJILOK U-NUT if abnormal deformation or other faults occur on the friction ring and clamp.
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Consult us before using the FUJILOK U-NUT under severe conditions or with low axial force.