Pencil zincs Harbor are machined from extruded rod, which has a tighter grain structure and more strength than cast parts.

Extruded rod is used up to 1.25″ in diameter, while cast rod is used in larger applications.

These anodes are used in water systems for cathodic protection of engines, heat exchangers, condensers, pipes, etc. and conform to MIL-A-18001K and MIL-DTL-18001L alloy.  HARBALUM Aluminum Anodes conform to MIL-A-24779 alloy.

ENGINE ANODES (PENCILS)

DIALENGTHTHREADBRASS HEAD
1/421/4 NC1/8"
3/81-1/2" to 6"3/8" NC3/8"
1/21-1/2" to 6"3/8" NC3/8", 1/2"
1/21-1/2" to 6"7/16" NC1/2"
5/81-1/2" to 6"3/8" NC1/2"
5/81-1/2" to 6"1/2" NC1/2"
5/81-1/2" to 6"7/16" NC1/2"
3/41-1/2" to 6"5/8" NC3/4"
3/41-1/2" to 6"1/2" NC3/4"
7/82" to 6"3/4" NC1"
7/82" to 6"1/2" NC3/4"
12" to 6"3/4" NC1"
12" to 6"5/8" NC1"
1-1/42" to 6"3/4" NC1-1/4"
1-1/42" to 6"1" NC1-1/4"
1-1/22" to 24"3/4" NC1-1/2"
1-1/22" to 24"1" NC1-1/2"
22" to 24"3/4" NC2"
22" to 24"1" NC2"

Most sizes stocked in 1/2 inch increments up to 6” long
(not including the thread length), however any length
can be made up to the length of our rod.

Thread sizes available:  National Course (NC),
National Fine (NF), National Pipe Thread (NPT),
Metric (MM).

YANMAR pencil: C272-100-200-300

VOLVO pencil: V-838929

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pencil
PZ62534375
PZ37515375
PZ753625
PZ52375
PZ1475
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BRASS HEADS

NPT SIZEINTERNAL THREADLBSSTYLE
1/8"1/4" NC0.02HEX
1/4"3/8" NC0.04HEX
3/8"3/8" NC0.07HEX
1/2"3/8" NC0.13HEX
1/2"7/16" NC0.12HEX
1/2"1/2" NC0.11HEX
3/4"5/8" NC0.21HEX
3/4"1/2" NC0.23HEX
3/4"7/16" NC0.27HEX
3/4"3/4" NC0.16HEX
3/4"3/8" NC0.29HEX
1"3/4"0.37HEX
1"5/8"0.41HEX
1"1"0.34HEX
1-1/4"3/4"0.92HEX
1-1/4"1"0.86HEX
1-1/2"3/4"1.9SQUARE
1-1/2"1"1.8SQUARE
2"3/4"2.4SQUARE
2"1"2.3SQUARE
BH375375
BH25375
BH5375
BH75625
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ZINC RODS

DIA (INCHES)NOMINAL LENGTHNOMINAL LBS / FT
3/8"72"0.34
1/2"72"0.61
5/8"72"0.95
3/4"72"1.37
7/8"72"1.86
1"72"2.43
1-1/4"72"3.8
1-1/2"24"5.5
1-3/4"24"7.5
2"24"9.7
2-1/4"24"12.3
2-1/2"24"15.2
2-3/4"24"18.4
3"24"22
3-1/2"24"30
4"24"39
5"24"61
5-1/2"24"74
6"12"88
7"24"120
7-3/8"24"133
.675"72"1.1
.840"72"1.7
1.050"72"2.7
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