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Austin Insulators Inc.
suppliers of RF insulators and transformers since 1933

   
       

 

Products:  
Self Supporting  
Base Insulator  
TYPES:  
A-4950(-C)  
A-4938(-C)  
A-4881(-C)  
A-4729(-C)  
A-3167(-C)  

Profile 
Dimensions 

 

Austin Base Insulators for Self Supporting Radio Towers and Masts
TYPES A-4950(-C), A-4938(-C), A-4881(-C), A-4729(-C), A-3167(-C)

 

   
         
       
  Dimensions    
 
Type A B C D E F Mast Fixing Insulator Mounting Net Weight
A-4950 23.5"
597 mm
20.25"
514 mm
4.625"
177 mm
dia.
5.5"
140 mm
dia.
5.5"
140 mm
dia.
  3 studs
3" (76mm) long
5/8" (16mm)
dia. 11 TPI
on 4" (102mm)
BCD
3 studs
3" (76mm) long
5/8" (16mm)
dia. 11 TPI
on 4" (102mm)
BCD
46 lb
21 kg
A-4950-C 23.5"
597 mm
20.25"
514 mm
4.625"
177 mm
dia.
5.5"
140 mm
dia.
6.0"
152 mm
square
4.625"
117 mm
3 studs
3" (76mm) long
5/8" (16mm)
dia. 11 TPI
on 4" (102mm)
BCD
4 holes drilled
7/8" (22mm)
square base
46 lb
21 kg
A-4938 23.25"
590 mm
19.25"
489 mm
9.125"
232 mm
dia.
10"
254 mm
dia.
10"
254 mm
dia.
  3 studs
3" (76mm) long
3/4" (19mm)
dia. 16 TPI
on 8-1/4" (210mm)
BCD
3 studs
3" (76mm) long
3/4" (19mm)
dia. 16 TPI
on 8-1/4" (210mm)
BCD
150 lb
68 kg
A-4938-C 23.25"
590 mm
19.25"
489 mm
9.125"
232 mm
dia.
10"
254 mm
dia.
10"
254 mm
square
8.13"
207 mm
3 studs
3" (76mm) long
3/4" (19mm)
dia. 16 TPI
on 8-1/4" (210mm)
BCD
4 holes drilled
13/16" (21mm)
square base
150 lb
68 kg
A-4881 36.75"
933 mm
32"
813 mm
9.375"
238 mm
dia.
11.75"
298 mm
dia.
11"
279 mm
dia.
  3 studs
3-1/2" (89mm) long
1" (25mm)
dia. 14 TPI
on 8" (203mm)
BCD
3 studs
3-1/2" (89mm) long
1" (25mm)
dia. 14 TPI
on 8" (203mm)
BCD
230 lb
105 kg
A-4881-C 36.75"
933 mm
32"
813 mm
9.375"
238 mm
dia.
11.75"
298 mm
dia.
11"
279 mm
square
8.25"
210 mm
3 studs
3-1/2" (89mm) long
1" (25mm)
dia. 14 TPI
on 8" (203mm)
BCD
4 holes drilled
1-1/8" (29mm)
square base
230 lb
105 kg
A-4729 37"
940 mm
32"
813 mm
10.25"
260 mm
dia.
12.0"
305 mm
dia.
12.0"
305 mm
dia.
  3 studs
4" (102mm) long
1-1/8" (29mm)
dia. 12 TPI
on 10" (254mm)
BCD
3 studs
4" (102mm) long
1-1/8" (29mm)
dia. 12 TPI
on 10" (254mm)
BCD
265 lb
120 kg
A-4729-C 37"
940 mm
32"
813 mm
10.25"
260 mm
dia.
12.0"
305 mm
dia.
12.0"
305 mm
square
9.0"
229 mm
3 studs
4" (102mm) long
1-1/8" (29mm)
dia. 12 TPI
on 10" (254mm)
BCD
4 holes drilled
1-1/4" (32mm)
square base
265 lb
120 kg
A-3167 37"
940 mm
32"
813 mm
11"
279 mm
dia.
13.75"
349 mm
dia.
13.75"
349 mm
dia.
  3 studs
6" (152mm) long
1-1/4" (32mm)
dia. 12 TPI
on 10" (254mm)
BCD
3 studs
6" (152mm) long
1-1/4" (32mm)
dia. 12 TPI
on 10" (254mm)
BCD
360 lb
163 kg
A-3167-C 37"
940 mm
32"
813 mm
11"
279 mm
dia.
13.75"
349 mm
dia.
13.75"
349 mm
square
10.6"
269 mm
3 studs
6" (152mm) long
1-1/4" (32mm)
dia. 12 TPI
on 10" (254mm)
BCD
4 holes drilled
1-3/8" (35mm)
square base
360 lb
163 kg
   
 

  • All Austin Insulator bases are designed for VLF, LF, and MF use, and are conservatively rated. Choose the unit that will meet your requirements for working download, working uplift, shear and RF operating voltage.
  • If you have a requirement which we do not seem to meet or you wish us to recommend a suitable insulator, please contact us and supply us with as much relevant information as possible.
   
       
 

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  Copyright © 2002 Austin Insulators Inc. All rights reserved.