Bushings, Nipples, Locknuts and Plugs
Ensures positive bonding of conduit to box
and prevents loosening due to vibration!
Locknuts
Bonding Locknuts
• Steel from ⁄4" to 2", malleable iron from 2 ⁄2" to 6"
• Steel or malleable iron (steel through 2")
• Aluminum 3003 from 1⁄2" to 6" or Type 304
stainless steel from 1⁄2" to 2"
• Can be used anywhere an ordinary locknut is installed
1
1
• Also can be used for Service Entrance applications
in conformance with code
A
• T&B rigid conduit and EMT (thinwall) fittings comply
with Federal Specification A-A-50553
(B) Thickness
Cat. No.
A
Dimensions (in.)
Stl./M.I.
Alum.
St. STL.
Size (IN.)
A
B
139*
140*
141**
142**
143
144
145
146
147
148
149
150
151
152
153
—
—
141AL
142AL
143AL
144AL
145AL
146AL
147AL
148AL
149AL
150AL
151AL
152AL
153AL
—
—
141-SST
142-SST
143-SST
144-SST
145-SST
146-SST
—
—
—
—
—
—
—
⁄4
3
⁄8
1
⁄2
3
⁄4
1
11⁄4
11⁄2
2
21⁄2
3
31⁄2
4
41⁄2
5
6
⁄4
15
⁄16
17⁄64
13⁄8
111⁄16
25⁄32
21⁄2
3
39⁄16
43⁄16
413⁄16
55⁄16
515⁄16
61⁄2
73⁄4
⁄64
⁄64
5
⁄32
3
⁄16
13
⁄64
13
⁄64
13
⁄64
7
⁄32
13
⁄32
13
⁄32
15
⁄32
15
⁄32
17
⁄32
17
⁄32
19
⁄32
3
1
9
Conduit & Fittings — T&B® Rigid Fittings
Available in your choice of steel/malleable
iron, aluminum or stainless steel.
(B) Thickness
9
Dimensions (in.)
Cat. No.
Size (IN.)
A
B
⁄2
⁄4
1
11⁄4
11⁄2
2
21⁄2
3
31⁄2
4
1 ⁄8
15⁄8
115⁄16
25⁄32
21⁄2
3
313⁄32
413⁄16
429⁄32
57⁄32
.125
.140
.170
.170
.170
.187
.375
.375
.438
.438
106
107†
108
109
110
111
112†
113†
114†
115†
†
*Hex shape
**Case hardened locknuts
Aluminum locknuts comply with federal standard of copper-free aluminum;
less than .5% copper.
†
1
3
3
Not CSA certified.
Available with DURA-PLATE ® Finish.
Available with DURA-PLATE ® Finish.
UL File No. E-3060
UL File E-23018
CSA File No. 638
CSA File No. 2884
Provides positive seal against water and oil.
Sealing Locknuts
• For use with rigid and intermediate metal conduits or fittings
• Provides watertight or raintight seal
at all enclosures
Dimensions (in.)
Cat. No.
A
B
C
Molded Santoprene Seal
Color: Blue
www.tnb.com
United States
Tel: 901.252.8000
800.816.7809
Fax: 901.252.1354
141SL
142SL
143SL
144SL
145SL
146SL
Size (IN.)
A
B
C
⁄2
3
⁄4
1
11⁄4
11⁄2
2
1.140
1.420
1.770
2.281
2.598
3.175
⁄8
5
⁄32
11
⁄64
11
⁄64
11
⁄64
3
⁄16
⁄4
⁄32
9
⁄32
5
⁄16
9
⁄32
7
⁄64
1
1
1
9
UL File No. E-23018
CSA File No. 2884
Technical Services
Tel: 888.862.3289
E-35