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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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