Technical Material
Fan Mounting Using Self-tapping Screw
Installing self-tapping screws into the plastic frame of the fan may split or deform it.
If using self-tapping screws, use screws that are recommended by our company, and refer to our recommended tightening torques and recommended pilot hole shapes. Pay close attention to the operating precautions and fully understand your equipment before you use it.
| Recommended screw torque [N·m] | Fan mounting hole diameter [mm] | |
| Ribbed fan (Fig. A) | 0.8 max. | ø3.5，ø4.3，ø4.5 |
| Counter rotating fan (Fig. B) | 0.6 max. |
Do not use self-tapping screws in the following cases:
- For ribless fans (except for counter rotating fans)
- When mounting finger guards on fans
Using self-tapping screws could deform or split the frame. Please use regular screws.
- Material: Steel
- Plating: Trivalent chromating plating
unit: mm
| Fan mounting hole diameter | Self-tapping screw model no. | Nominal screw diameter | Length [L] |
Head shape | Flat-head/pan-head dimensions | ||
| Head diameter [D] |
Height of head [H] |
Cross recess No. | |||||
| ø3.5 | SY-NS020412P11 | 4 | 12 | Flat | 6.2 | 1.1 max. | 2 |
| SY-NS010412P11 | 4 | 12 | Pan | 5.5 | 2.0 | 2 | |
| ø4.3 | SY-NS024812P15 | 4.8 | 12 | Flat | 6.8 | 1.2 max. | 2 |
| SY-NS014812P15 | 4.8 | 12 | Pan | 7.0 | 2.6 | 2 | |
| ø4.5 | SY-NS020512P15 | 5 | 12 | Flat | 6.8 | 1.2 max. | 2 |
| SY-NS010512P15 | 5 | 12 | Pan | 7.0 | 2.6 | 2 | |
- Place the self-tapping screw so that it is vertical and centered with the frame mounting hole (Fig. A) and then screw it in. The self-tapping screw could deform or split the frame if you screw it into the frame when the screw is not vertical.
- Screw in the self-tapping screw with the center of the mounting hole on the fan and the center of the pilot hole on the mounting plate aligned (Fig. B). Misaligned holes could lead to the frame being deformed or split.
- Tightening the screw beyond the recommended screw torque could deform or split the frame.
- With flat-head screws, failure to use the recommended pilot hole shape will cause interference between the flat-head screw and fan frame which could split the frame.
To purchase the screws, please contact the screw manufacturer directly.
SAIMA CORPORATION
2-9-17 Tsujido Fujisawa Kanagawa 251-0047 JAPAN
TEL:+81-466-36-3656 FAX:+81-466-36-0009
https://www.saima.co.jp/en/top.php
Last updated: May 2023