Hastings, piston ring set 2.745". +.040"

Includes parkerised grey cast iron compression and oil rings. Compatible with 1929-1949 old style pistons with a one-piece cast iron oil ring.
Standard cylinder bore diameter: 2.745" (69.72mm).
1st ring: 2.3mm (3/32).
2nd ring: 2.3mm (3/32').
Oil ring: 3.2mm (1/8").
Note: 1950-1973 OEM pistons are fitted with 1/16" (1.6mm) 1st and 2nd rings and late style 3-piece 3/16" (4.75mm) flex-vent oil rings for better oil control. For these Hastings rings, see the 1950-1973 Flathead models. The rings mentioned above are not compatible with the new style 1950-1973 pistons.
Technical tip: Piston grooves vs. piston rings.
It is not difficult to determine whether a Hastings piston ring set will fit a given piston. You must measure the piston groove height on the piston itself. The 2 upper grooves will be for the compression rings, and the lower groove will be for the oil ring. In most cases, Hastings oil rings are the low-tension 3-piece flex-vent type. Ring heights are listed for reference.
Technical tip: Piston oversizes.
For each oversize, the cylinder bore increases by .010" (0.254mm). The standard cylinder bore is stated for reference.
(Technical advice information provided by Hastings Manufacturing Company, Inc.)


Specifications


Brand
Hastings


Application
29-49 45" (750cc) Flathead (NU)


Sales unit
Par


Material
Steel


Packaging weight
0.101 kg


HS Code
84099100


Motorcycle family
SERVI-CAR


Original name
Hastings, 2.745" bore piston ring set. +.040"