Parallax Technology, Inc

Pieces of KOVAR tubing for sale. All sale final. While supplies last
*KOVAR is an Iron-Nickel-Cobalt alloy with coefficient of thermal expansion (CTE) very
close to Pyrex. We use it in our glass laser tubes as transition metal in glass-to-metal seals

Last updated January 02, 2026

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Minimum order for KOVAR is $100.
Price does not include shipping.
For "TYPE" explanation, please see bottom of page and sample photo

This is the COMPLETE LIST of our Surplus Kovar pieces for sale.
We have no OTHER !

Individual pieces as listed below. Dimensions in inches. Sample Photo 1 and Photo 2
SORTED ON DECREASING OD
Type OD +/-0.02 Length +/- 0.05 Wall Qty on hand Price each $
C 4.5 photo 2.5 0.120 2, 0 50
C 3.1 photo 2.5 0.04 13, 8, 0 15
C 3.10 1.60 0.11 8 , 0 15
C 2.25 2.25 0.050 7, 0 10
C 2.2 1.50 0.035 13 , 0 10
C 2.17 photo 1.50 0.035 35 , 18 10
C 1.97 2.75 0.050 35 , 0 10
C 1.97 2.00 0.050 4 , 0 8
C 1.93, photo 0.60 0.03 31 8
C 1.75, photo 1 1/8" 0.100 30 , 0 8
Type OD +/-0.02 Length +/- 0.05 Wall Qty on hand Price each $
C 1.6, photo 1.5 0.03 53 , 7, 0 8
C 1.61, photo 0.7 0.05 42 5
C 1.61+/-0.01, photo 1.6 0.050 29, 4 ,0 10
C 1.50, photo 1.5" 0.04 24 , 0 8
FC 1.50 1.25 0.035 32 , 0 8
C 1.38 1.75 0.03 1 10
C 1.38 1.00 0.03 8 8
C 1.25 1.50 0.03 6 , 0 12
C 1.25 photo 0.9 0.03 3 , 0 10
C 1.19 photo 1 1/4 0.05 20 , 0 8
C 1.10 2.9 0.100 8 , 0 8
C 1.09 0.75 0.100 21 , 0 8
Type OD +/-0.02 Length +/- 0.05 Wall Qty on hand Price each $
T 1.00 photo 0.75 0.03 13 6 20 each
C 1.00, photo 1.63 0.03 96 79 59 16 each
C 1.00 0.90 0.050 45 12
C 0.93", 24 mm, photo 0.69 0.03 47  35 12
C 0.90 0.88 0.03 24 12
C 0.88", photo 0.50 0.025 50+ 8
T 0.75, photo Long 0.75 OD
tubes
0.03 2 ft
4 ft
min cut 2 feet
 $175 per ft
$155 per ft
 
T 0.75 photo 0.70 0.03 23 20 each
T 0.75 photo 0.65 0.03 48 20 each
T 0.75 photo 0.60 0.03 18   4 20 each
C 0.69 1 1/8 0.03 400 , 0 12
C 0.68 1.00 0.03 41 , 0 12
C 0.66 1.20 0.03 80 , 0 12
T 0.65 1.75 0.03 74, 0 12
Type OD +/-0.02 Length +/- 0.05 Wall Qty on hand Price each $
T 0.68 photo 0.75 0.03 35 18 each
T 0.65 photo 0.65 0.03 50+ 18 each
FC 5/8 photo 0.4 0.03 49 5
C 0.62 photo 1.20 0.03 50+ 10
T 5/8 = 0.62 photo 0.75 0.03 4 18
C 0.50 1.50 0.03 18 , 0 8
FT 0.50 photo 7/8" 0.02 105 ,65 , 25 , 0 10
FC 0.50 7/8" 0.02 4 10
T 0.50 photo 0.87 0.02 41, 32 ,  0 12
C 0.50 0.63 0.02 11 8
C 7/16 photo 0.9 0.03 200   50+ 3 each
FC 7/16 photo

Sketch

1.80 0.03 110  50+
 3 each
FC 7/16 photo 1.1 0.03 38 3
FC 0.38" photo 5/8" 0.025 200   50+ 3 each
Type OD +/-0.02 Length +/- 0.05 Wall Qty on hand Price each $
T 3/8 photo 1" 1.0 0.03 30 10
C 3/8 photo, 1/2" 0.50 0.03 50+ 3 each
C 0.36 0.56 0.03 8 ,  0 4
C 0.25 photo 0.45 0.02 50+ 3 each
FT 0.25 photo 0.45 0.02 50+ 3 each
FT 0.20 sketch 0.35 0.015 19 3 each
FT 0.175 photo 0.30 0.015 17   5 3 each
Kovar
Thermal Coeff. of expansion:
deg C 300 400 500 600 700 800
mil/inch 1.5 2.3 2.8 4.5 6 8

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