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Applications

Coolant transfer in heater and coolant circuits

Automobiles, buses, mobile/off-road equipment, trucks

Silicone Coolant/ Heater Hose

Series 6621 is a super-flexible silicone coolant/ heater hose designed to transfer high temperature solutions between the radiator and engine on automobiles, buses, mobile/ off-road equipment, trucks and any engine incorporating a radiator application. The hose meets SAE J20R2 Class A and ISO 1307-1997 performance criteria, with a temperature range of -76F to +392F (-60C to +200C). The hose construction incorporates multiple plies of textile reinforcement for durability, a helical wire for limited suction capability and collapse/kink resistance, and resists coolant solutions, aging, cold leaks, cracking, delamination, ozone and peeling. The unique Greek corrugations are tightly pitched and precision engineered, providing extreme flexibility and kink resistance for applications that require tight bends for routing through confined spaces where formed hoses might normally be required. Series 6621 is manufactured on 130-foot-mandrels- providing the longest and most flexible continuous hose lengths in the industry- for tight dimensional tolerances and maximum inventory utilization.

Tube: Black silicone (other colors available; contact Parker)
Reinforcement: Multiple high temperature textile plies with wire helix
Cover: Red Greek corrugated silicone, matte finish (other colors available; contact Parker)
Temp Range: -76F to + 392F (-60C to + 200C)
Brand Method: Black text on yellow stripe
Brand Example: PARKER SILICONE SERIES 6621 -76F to +392F (DATE CODE) MADE IN ITALY
Max. Rec. WP 1/3 of minimum burst pressure shown in the table below
Industry Standards: SAE J20R1 Class A; TMC RP303B ; ISO 1307-1997 for dimensional tolerance
Vacuum: 17.7 in/hg
Packaging Coils

 
 
Part Number Size
(in)
ID
(in)
ID
(mm)
OD
(in)
OD
(mm)
Approx Wt
(lbs/ft)
Min Bend Rad
(in)
Min
Burst
Press
(psi)
Perm
Cplg
Rec
Std Pack Qty
(ft)
Stock Status
6621-0500025 1/2 0.512 13.0 0.906 23.0 0.21 1.2 225 * 25 N
6621-0500130 1/2 0.512 13.0 0.906 23.0 0.21 1.2 225 * 130 N
6621-0625025 5/8 0.630 16.0 1.024 26.0 0.22 1.4 225 * 25 N
6621-0625130 5/8 0.630 16.0 1.024 26.0 0.22 1.4 225 * 130 N
6621-0750025 3/4 0.748 19.0 1.142 29.0 0.24 1.8 225 * 25 N
6621-0750130 3/4 0.748 19.0 1.142 29.0 0.24 1.8 225 * 130 N
6621-1000025 1 0.984 25.0 1.378 35.0 0.30 2.0 225 * 25 Y
6621-1000130 1 0.984 25.0 13.78 35.0 .30 2.0 225 * 130 N
6621-1250025 1 1/4 1.260 32.0 1.693 43.0 0.40 3.2 225 * 25 Y
6621-1375025 1 3/8 1.378 35.0 1.811 46.0 0.43 3.7 225 * 25 N
6621-1500025 1 1/2 1.496 38.0 1.929 49.0 0.46 3.9 225 * 25 Y
6621-1750025 1 3/4 1.772 45.0 2.205 56.0 0.54 5.1 225 * 25 N
6621-2000025 2 2.008 51.0 2.520 64.0 0.88 5.9 225 * 25 Y






Table Notes: 
* Couplings:Refer to CrimpSource at www.safehose.com for coupling recommendations and crimp specifications.

** Stock: "Y" indicates stocked item; "N" indicates non-stocked item. Stock status subject to change. Contact Parker Customer Service.




WARNINGS!
Couplings attached with bands or clamps may reduce the working pressure of the hose assembly to less than the maximum rated working pressure of the hose. Refer to the NAHAD Industrial Hose Assembly Guidelines.