2020 BURNDY Master Catalog

Reference

Hardware Data Recommended Termination Hardware / Recommended Tightening Torque per UL486A/B

HARDWARE DATA (continued)

Recommended Tightening Torque per UL486A & UL486B Table 22 - Tightening torque for slotted head screws smaller than No. 10 intended for use with 8 AWG (8.4 mm 2 ) or smaller conductors

Tightening Torque, N●m (lbf-in)

Slot Length of Screw*

Slot Width of Screw Smaller than 1.2 mm (.047 in.) b

Slot Width of Screw 1.2mm (.047 in.) and larger**

mm

inch

A

B

A

B

Less than 4 Less than 5/32

0.68 (6) 0.68 (6) 0.68 (6) 0.68 (6) 0.79 (7)

0.79 (7) 0.79 (7) 0.79 (7) 0.79 (7) 1.0 (9)

0.79 (7) 1.1 (10) 1.1 (10) 1.1 (10) 1.1 (10) 1.4 (12) 1.8 (16)

1.0 (9) 1.4 (12) 1.4 (12) 1.4 (12) 1.4 (12) 1.7 (15) 2.3 (20)

4

5/32 3/16 7/32

4.8 5.6 6.4 7.1

1/4

9/32

- -

- -

Above 7.1

Above 9/32

* For slot lengths of intermediate values, select torques pertaining to next shorter slot length. Also see Table 21 for screws with multiple tightening means. Slot length shall be measured at the bottom of the slot. ** Slot width is the nominal design value

Recommended Tightening Torque per UL486A & UL486B Table 23 - Tightening torque for screws with recessed allen or square drives

Socket Width Across Flats*

Tightening Torque, N●m (lbf-in)

mm

inch

A

B

3.2 4.0 4.8 5.6 6.4 7.9 9.5

1/8

4.0 (35) 9.0 (80)

5.1 (45)

5/32 3/16 7/32

11.3 (100) 13.6 (120) 16.9 (150) 25.4 (225) 33.9 (300) 45.2 (400) 56.6 (500) 67.8 (600)

11.3 (100) 13.6 (120) 16.9 (150) 25.4 (225) 33.9 (300) 45.2 (400) 56.6 (500)

1/4

5/16

3/8 1/2

12.7 14.3

9/16

* See Table 21 for screws with multiple tightening means

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