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RECOMMENDED
TIGHTENING TORQUE
PER UL486A AND UL486B
a
For values of slot width or length not corresponding to those specified, select the largest torque value associated with the
conductor size. Slot width is the nominal design value. Slot length shall be measured at the bottom of the slot.
a
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.
b
Slot width is the nominal design value.
a
See Table 21 for screws with multiple tightening means.
O-7
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®
Reference
Tightening Torque, N•m (lbf-in)
Slotted Head No. 10 and Larger
a
Slot Width — 1.2 mm Slot Width — Over 1.2 mm
(0.047 in.) or Less and
(0.047 in.) or Slot
Hexagonal Head — External Drive Socket
Test Conductor Size
Slot Length — 6.4 mm Length — Over 6.4 mm
Wrench
Installed in Connector
(1/4 in.) or less
(1/4 in.)
Split-Bolt Connectors
Other Connectors
AWG or
kcmil
(mm
2
)
A
B
A
B
A
B
A
B
30 - 10
(0.05 - 5.3)
1.7 (15)
2.3 (20)
2.8 (25)
4.0 (35)
7.3 (65)
9.0 (80)
6.8 (60)
8.5 (75)
8
(8.4)
2.3 (20)
2.8 (25)
3.4 (30)
4.5 (40)
7.3 (65)
9.0 (80)
6.8 (60)
8.5 (75)
6 - 4
(13.2 - 21.2)
2.8 (25)
4.0 (35)
4.0 (35)
5.1 (45)
15.3 (135)
18.6 (165)
10.2 (90)
12.4 (110)
3
(26.7)
2.8 (25)
4.0 (35)
4.5 (40)
5.6 (50)
25.4 (225)
31.1 (275)
14.1 (125)
16.9 (150)
2
(33.6)
3.4 (30)
4.5 (40)
4.5 (40)
5.6 (50)
25.4 (225)
31.1 (275)
14.1 (125)
16.9 (150)
1
(42.4)
— 4.5 (40)
5.6 (50)
25.4 (225)
31.1 (275)
14.1 (125)
16.9 (150)
1/0 - 2/0
(53.5 - 67.4)
— 4.5 (40)
5.6 (50)
35.6 (315)
43.5 (385)
16.9 (150)
20.3 (180)
3/0 - 4/0
(85.0 - 107.2)
— 4.5 (40)
5.6 (50)
45.2 (400)
56.5 (500)
22.6 (200)
28.2 (250)
250 - 350
(127 - 177)
— 4.5 (40)
5.6 (50)
62.1 (550)
73.4 (650)
28.2 (250)
36.7 (325)
400
(203)
— 4.5 (40)
5.6 (50)
76.3 (675)
93.2 (825)
28.2 (250)
36.7 (325)
500
(253)
— 4.5 (40)
5.6 (50)
76.3 (675)
93.2 (825)
33.9 (300)
42.4 (375)
600 - 750
(304 - 380)
— 4.5 (40)
5.6 (50)
90.4 (800)
113.0 (1000)
33.9 (300)
42.4 (375)
800 - 1000
(406 - 508)
— 4.5 (40)
5.6 (50)
111.7 (900) 124.3 (1100)
45.2 (400)
56.5 (500)
1250 - 2000 (635 - 1000)
— 111.7 (900) 124.3 (1100)
56.5 (500)
67.8 (600)
Tightening Torque, N•m (lbf-in)
Slot Width of Screw
Slot Width of Screw
Smaller than 1.2 mm 1.2 mm (0.047 in.)
Slot Length of Screw
a
(0.047 in.)
b
and larger
b
mm
(in.)
A
B
A
B
Less than 4
(Less than 5/32)
0.68 (6)
0.79 (7)
0.79 (7)
1.0 (9)
4
(5/32)
0.68 (6)
0.79 (7)
1.1 (10)
1.4 (12)
4.8
(3/16)
0.68 (6)
0.79 (7)
1.1 (10)
1.4 (12)
5.6
(7/32)
0.68 (6)
0.79 (7)
1.1 (10)
1.4 (12)
6.4
(1/4)
0.79 (7)
0
1.0 (9)
1.1 (10)
1.4 (12)
7.1
(9/32)
— 1.4 (12)
1.7 (15)
Above 7.1
(Above 9/32)
— 1.8 (16)
2.3 (20)
Socket Width
Tightening Torque,
Across Flats
a
N•m (lbf-in)
mm (in.)
A
B
3.2 (1/8)
4.0 (35)
5.1 (45)
4.0 (5/32)
9.0 (80)
11.3 (100)
4.8 (3/16)
11.3 (100)
136.6 (120)
5.6 (7/32)
13.6 (120)
16.9 (150)
6.4 (1/4)
16.9 (150)
22.6 (200)
7.9 (5/16)
25.4 (225)
31.1 (275)
9.5 (3/8)
33.9 (300)
42.4 (375)
12.7 (1/2)
45.2 (400)
56.5 (500)
14.3 (9/16)
56.5 (500)
67.8 (600)
Table 21—Tightening torque for screws
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
Table 23—Tightening torque for
screws with recessed allen or
square drives