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HARDWARE DATA
RECOMMENDED
TIGHTENING TORQUE
The hardware used in connectors must be
compatible with the connector material, have
high mechanical strength and be corrosion
resistant.
Copper alloy connectors have hardware
made of DURIUM™, which is BURNDY's
trade name for silicon bronze alloy
ASTMB99. This material was first introduced
by BURNDY
®
in 1927 for use in outdoor con-
struction, and today, is the standard through-
out the industry.
Aluminum connectors generally have alu-
minum alloy hardware. The bolts are 2024T4
and anodized to resist corrosion. The nuts
are 6061T6, which is resistant to corrosion
and does not require anodizing. Bolts are
lubricated to eliminate galling and to provide
consistent clamping forces.
The size material for clamping hardware are
selected to provide the required force when
tightened to the recommended torque. To
reduce or greatly exceed the recommended
torque can adversely affect the performance
of the connector.
DURIUM™
(SILICON BRONZE)
HEXAGONAL BOLT DATA
erawdraHleetS
erawdraHmunimulA
tloB
eziS
dednemmoceR
euqroT
)sdnuoPhcnI(
tloB
eziS
dednemmoceR
euqroT
)sdnuoPhcnI(
02-4/1
08
31-2/1
003
81-61/5
081
11-8/5
084
61-8/3
042
01-4/3
056
31-2/1
084
11-8/5
066
01-4/3
0501
CATALOG NO.
SERIES
"A" (BOLT
SIZE)
"B"
"C"
"D"
RECOMMENDED
TORQUE (in-lb)
MIN.
BREAKING
FORCE (lb)
MIN.
SHEARING
FORCE (lb)
25X_ _ _HEB
1/4 - 20 UNC 7/16
.50
.16
80
1,780
990
31X_ _ _HEB
5/16 - 18 UNC 1/2
.56
.21
180
2,930
1,640
38X_ _ _HEB
3/8 - 16 UNC 9/16
.65
.24
240
4,350
2,430
50X_ _ _HEB
1/2 - 13 UNC
3/4
.87
.32
480
7,950
4,460
62X_ _ _HEB
5/8 - 11 UNC 15/16
1.08
.40
660
12,700
7,100
75X_ _ _HEB
3/4 - 10 UNC 1-1/8
1.30
.48
1050
17,510
10,540
1. Material: DURIUM™ (Silicon Bronze)
"_ _ _" is substituted for bolt length. Consult sales
representative for available lengths.
These torque values develop maximum bolt preload.
4. This drawing is based on BURNDY
®
engineering spec.
RECOMMENDED
TERMINATION
HARDWARE
O-6
Canada: 1-800-387-6487
www.burndy.com
US: 1-800-346-4175
Reference
BURNDY
®