Chief Aircraft Inc - Aircraft Parts

Sigma-Tek High-Flow Fitting

Sigma-Tek high-flow vacuum system fittings. FAA-PMA Approved.

Part No.	PHOTO	Description	CART	Price
ST 53B423-001	PHOTO	Fitting Straight, 3/8 inch NPT x 5/8 Hose, Sigma Tek A 3/8 in. fitting is used for the pump output port (pressure) in a typical vacuum installation having 5/8 in. hoses. Similar to Airborne model 1K10-6-10.	ADD	$34.95
ST 53B423-002	PHOTO	Fitting 45 Deg, 3/8 inch NPT x 5/8 Hose, Sigma Tek A 3/8 in. 45 deg fitting is used for either inlet or outlet ports with installations using 5/8 in. hoses. Similar to Airborne model 1K9-6-10.	ADD	$34.95
ST 53B423-003	PHOTO	Fitting 90 Deg Long, 3/8 inch NPT x 5/8 Hose, Sigma Tek A 3/8 in. 90 deg long high-flow fitting used for either inlet or outlets with installations using 5/8 in. hoses. Must always use this fitting to avoid interference with AEON piston pump.	ADD	$34.95
ST 53B423-004	PHOTO	Fitting 90 Deg Short, 3/8 inch NPT x 5/8 Hose, Sigma Tek A 3/8 in. 90 deg short high-flow fitting used for either inlet or outlets with installations using 5/8 in. hoses. Must always use this fitting to avoid interference with AEON piston pump and when two 90 deg fittings are used.	ADD	$34.95
ST 53B423-005	PHOTO	Fitting 90 Deg 2.5 inch, 3/8 inch NPT x 5/8 Hose, Sigma Tek	ADD	$34.95
ST 53B425-001	PHOTO	Pump Flange Spacer, 1/4 inch, Sigma Tek This adapter may be installed between the piston air pump and the AND20000 engine pump pad. To allow the pump an additional 1/4 in. clearance from the pump pad where necessary.	ADD	$29.50

NPT - National Pipe Thread Taper
Note! Pipe thread sizes do not refer to any physical dimensions. The outside diameter of a pipe or fitting must be measured and referenced to a table for size identification.
Note! Inserting a NPT tapered fitting into a port tapped for a straight thread fitting and tightening it can break or severely damage the item the fitting is being installed in.
Pipe Size (inch)	Thread Pitch TPI	Fitting O.D. (inch)	NPT Specifications
1/16"	27	0.313"	Tapered thread 1° 47' Flat truncation of thread roots and crests Thread angle 60° Thread Pitch measured in threads per inch
1/8"	27	0.405"
1/4"	18	0.540"
3/8"	18	0.675"
1/2"	14	0.840"