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Flexfab 5526-062x50, 5/8" ID x 50 ft Box Blue Silicone Heater Hose, 16mm 350F Radiator Coolant

Flexfab 5780-138, 1.38" x 3 ft, High Temp Red Silicone Meta-Aramid Coolant Hose, 35mm

by Flexfab
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$ 127.79
$ 127.79 - $ 127.79
$ 127.79
$ 102.19
$ 102.19 - $ 102.19
$ 102.19
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Quick Specs

BrandFlexfab
Series5780
TypeHose
Body Size1-3/8"
Length3 ft
ColorRed

Performance & Construction

Construction Red silicone + meta-aramid 4-ply
Inside Diameter 1.38" (35 mm)
Outside Diameter 1.77" (45 mm)
Actual Burst Pressure 450 PSI
Working Pressure ~150 PSI (1/3 of burst)
Temperature Range -65F to +500F
Wall Thickness 0.17"/0.22"
Standards SAE J20 R1 H.T.
Origin Made in USA

Product Details

Product Details

The Flexfab 5780-138 is a red silicone + meta-aramid 4-ply hose engineered for demanding engine environments. It resists hardening, cracking, cold leaks, aging, and many chemicals, making it a durable, long-lasting solution for diesel, automotive, marine, agricultural, and industrial cooling systems.

Why this hose

  • Red silicone + meta-aramid 4-ply ā€” durable construction engineered for demanding cooling-system service.
  • -65F to +500F range ā€” stays flexible in cold and handles under-hood heat without hardening or cracking.
  • Resists hardening, cracking, cold leaks, aging, and many chemicals ā€” long service life where ordinary rubber fails.
  • Meets SAE J20 R1 H.T. ā€” engineered to recognized heavy-duty hose standards.

Frequently asked questions

Flexfab 5780 Series ā€” Complete Size Chart

Every size in the series. Click a part number to open that product.

Part ID
(in)		 ID
(mm)		 OD
(in)		 OD
(mm)		 Actual
Burst		 SAE TMC Weight
(lb/ft)
5780ā€‘038
5780ā€‘038X12 		0.38" 10 0.77" 20 600 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘050
5780ā€‘050X12 		0.50" 13 0.89" 23 600 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘062
5780ā€‘062X12 		0.63" 16 1.02" 26 575 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘075
5780ā€‘075X12 		0.75" 19 1.14" 29 575 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘087
5780ā€‘087X12 		0.88" 22 1.27" 32 550 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘100
5780ā€‘100X12 		1.00" 25 1.39" 35 550 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘112 1.13" 29 1.52" 39 500 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘125
5780ā€‘125X12 		1.25" 32 1.64" 42 500 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘138
5780ā€‘138X12 		1.38" 35 1.77" 45 450 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘150 1.50" 38 1.89" 48 450 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘175 1.75" 44 2.14" 54 400 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘200
5780ā€‘200X12 		2.00" 51 2.39" 61 400 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘225
5780ā€‘225X12 		2.25" 57 2.64" 67 350 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘250
5780ā€‘250X12 		2.50" 64 2.89" 73 300 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘262 2.63" 67 3.13" 79 275 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘275 2.75" 70 3.25" 83 275 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
5780ā€‘300 3.00" 76 3.50" 89 250 PSI N/A (J20 R1 H.T.) ā€” (not in catalog)
FLEXFAB

Industrial silicone hose engineered for heater, coolant, and high temperature service. Genuine Flexfab product with correct part numbers and specifications.

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