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All Richards insulators are made from the highest quality raw materials carefully blended to obtain superior resistance to thermal shock, good insulating properties at high temperatures, and mechanical strength. Strict attention to hole size, wall thickness, and other details resulting in minimum breakage during installation.

STEATITE/CORDIERITE - Short Insulators, or use to 1090ºC (2000ºF)

MULLITE
for use to 1590ºC (2900ºF)

ALUMINA
for use to 1900ºC (3450ºF)

Steatite/Cordierite -
Short Insulators, for use to 1090ºC (2000ºF)

 

SHORT INSULATORS UNDER 3 INCHES
Oval-Double Hole Insulators
Catalog
No.
Wire
Gauge
Two Hole Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
 82-1/2-O 8 2 1/2 .50 x.28 .188 12.7 12.7 x 7.1 1.3
 821-O 8 2 1 .50 x.28 .188 25.4 12.7 x 7.1 2.5
 823-O 8 2 3 .50 x.28 .188 76.2 12.7 x 7.1 7.7
1021-O 10 2 1 .44 x.25 .143 25.4 11.2 x 6.4 3.6
1121-O 11 2 1 .35 x.22 .110 25.4 8.9 x 5.6 2.8
142-1/2-O 14 2 1/2 .31 x.19 .090 12.7 7.9 x 4.8 2.3
1421-O 14 2 1 .31 x.19 .090 25.4 7.9 x 4.8 2.3
1423-O 14 2 3 .31 x.19 .090 76.2 7.9 x 4.8 2.3
2021-O 20 2 1 .31 x.19 .042 25.4 4.3 x 3.0 1.0
2023-O 20 2 3 .17 x.12 .042 76.2 4.3 x 3.0 1.0

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Round-Single Hole Insulators
Catalog
No.
Wire
Gauge
One
Hole
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
 811 8 1 1 .340 .205 25.4 8.7 5.2
 811-S 8 1 1 .250 .156 25.4 6.4 4.0
 813-S 8 1 3 .250 .156 76.2 6.4 4.0
1411 14 1 1 .220 .090 25.4 5.5 2.3
1411-S 14 1 1 .140 .080 25.4 3.6 0.5
1611 16 1 1 .140 .080 25.4 3.6 1.5

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Round-Double Hole Insulators
Catalog
No.
Wire
Gauge
Two
Hole
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
 821 6 or 8 2 2 .500 .188 25.4 12.7 4.7
 823 6 or 8 2 3 .500 .188 76.2 12.7 4.7
1421 14 2 1 .250 .080 25.4 6.4 2.0
1423 14 2 3 .250 .080 76.2 6.4 2.0
2021 20 2 1 .150 .080 25.4 3.8 1.1
2023 20 2 3 .150 .042 76.2 3.8 1.1
2223 22 2 3 .120 .042 76.2 3.0 0.8
3023 30 2 3 .062 .042 76.2 1.6 0.4

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Round-Four Hole Insulators
Catalog
No.
Wire
Gauge
Four
Hole
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
 841 8 4 1 .500 .140 25.4 12.7 3.6
1441 14 4 1 .315 .080 25.4 8.0 2.0
1421 20 4 1 .188 .040 25.4 4.7 1.0

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Fishspine Insulators
Catalog
No.
Wire
Gauge
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
 3F 8 .540 .540 .240 13.7 13.7 6.1
 7F 8 .400 .400 .156 10.2 10.2 4.0
 8F 8 .260 .260 .152 6.6 6.6 3.9
12F 10 .200 .200 .092 5.1 5.1 2.3
14F 11 .170 .170 .058 4.3 4.3 1.7
20F 14 .125 .125 .056 3.2 3.2 1.4
24F 14 .110 .110 .055 2.8 2.8 1.4

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MULLITE - For use to 1590ºC (2900ºF)

Round-Single Hole Insulators* = Specify length
Catalog
No.
Wire
Gauge
One
Hole
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
141-* 14 1 * .250 .125 * 6.4 3.2
161-1 16 1 1 .188 .094 25.4 4.8 2.4
201-1 20 1 1 .195 .055 25.4 4.8 1.6
201-* 20 1 * .188 .062 * 4.8 1.6
241-1 24 1 1 .125 .058 25.4 3.2 1.0
241-* 24 1 * .125 .055 * 3.2 1.0
 
Round-Double Hole Insulators* = Specify length
Catalog
No.
Wire
Gauge
Two
Hole
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
142-* 14 2 * .250 .078 * 6.4 2.0
202-1/2 20 2 1/2 .188 .060 12.7 4.8 1.5
202-1 20 2 1 .188 .060 25.4 4.8 1.5
202-* 20 2 * .188 .060 76.2 4.8 1.5
222-* 22 2 * .163 .040 * 3.0 0.8
242-1/2 24 2 1/2 .125 .040 12.7 3.2 1.0
242-1 24 2 1/2 .125 0.40 12.7 3.2 1.0
242-* 24 2 * .125 .040 12.7 3.2 1.0
262-* 26 2 * .094 .020 * 2.4 .51
302-* 30 2 to 30 .062 .015 to 762 1.6 .04

 
Round-Four Hole Insulators* = Specify length
Catalog
No.
Wire
Gauge
Four
Hole
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
144-* 14 4 * .335 .098 * 8.5 2.5
204-1 20 4 1 .188 .047 25.4 4.8 1.5
204-* 20 4 * .188 .047 * 4.8 1.5
244-* 24 4 * .125   * 3.2  
264-* 26 4 * .094 .020 * 2.4 .51

  1.) Lengths stocked are multiples of 6 inches (152.4 mm) up to 72 depending  on the item,
       except and 302 up to 30 inches (609.6 mm).

  2.) Special lengths cut upon request. For Collar add "C" to Catalog number.
       Example: 202C-12

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ALUMINA - For use to 1900ºC (3450ºF)  

Oval-Double Hole Insulators* = Specify length
Catalog
No.
Wire
Gauge
Two
Hole
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
  82A -*-O 8 2 1/2 .47 x .28 .156 * 11.9 x 7.1 4.0
 
Round-Single Hole Insulators * = Specify length
Catalog
No.
Wire
Gauge
One
Hole
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
141A -* 14 1 * .250 .125 * 6.4 3.2
161A -1 16 1 1 .188 .094 25.4 4.8 2.4
201A -1 20 1 1 .195 .055 25.4 4.8 1.6
201A -* 20 1 * .188 .062 * 4.8 1.6
241A -1 24 1 1 .125 .058 25.4 3.2 1.0
241A -* 24 1 * .125 .055 * 3.2 1.0
 
Round-Double Hole Insulators* = Specify length
Catalog
No.
Wire
Gauge
Two
Hole
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
142A -* 14 2 * .250 .078 * 6.4 2.0
202A -1/2 20 2 1/2 .188 .060 12.7 4.8 1.5
202A -1 20 2 1 .188 .060 25.4 4.8 1.5
202A -* 20 2 * .188 .060 76.2 4.8 1.5
222A -* 22 2 * .163 .040 * 3.0 0.8
242A -1/2 24 2 1/2 .125 .040 12.7 3.2 1.0
242A -1 24 2 1/2 .125 .040 12.7 3.2 1.0
242A -* 24 2 * .125 .040 12.7 3.2 1.0
262A -* 26 2 * .094 .020 * 2.4 .51
302A -* 30 2 to 30 .062 .015 to 762 1.6 .04
 
Round-Four Hole Insulators* = Specify length
Catalog
No.
Wire
Gauge
Four
Hole
Inches Millimeters
Length O.D. Hole Dia. Length O.D. Hole Dia.
144A -* 14 4 * .335 .098 * 8.5 2.5
204A -1 20 4 1 .188 .047 25.4 4.8 1.5
204A -* 20 4 * .188 .047 * 4.8 1.5
244A -* 24 4 * .125   * 3.2  
264A -* 26 4 * .094 .020 * 2.4 .51

  1.) Lengths stocked are multiples of 6 inches (152.4 mm) up to 72 depending  on the item,
       except 302A up to 30 inches (609.6 mm).

  2.) Special lengths cut upon request. For Collar add "C" to Catalog number.
       Example: 202AC-12
 

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