Hastings 3.433"/87.20 mm Bore +.030" Over Size, Single Cylinder Ring Set with 2.00 mm Top Ring, 2.50 mm Second Ring and a First Oil Ring is 4.00 mm.
This Hastings Single Cylinder Ring Set has a top ring manufactured from grey iron with phosphate ring surface treatment, a second ring manufactured from grey iron with phosphate ring surface treatment. The 1st oil control ring is manufactured of steel rail/stainless expansion with a chrome rail ring surface treatment.

Application Summary:

Year Make/Model
1968-1973 Nissan 510
1970-1972 Nissan 521 Pickup
1972-1973 Nissan 620 Pickup
Attributes
1st Oil Groove 4.00
1st Oil Ring Material STEEL RAIL/STAINLESS EXP
2nd Groove 2.00
2nd Ring Surface Treatment PHOSPHATE
Alternate Part Number 6831S.030
California Proposition 65 No
Engborein 3.268
Engboremetric 83.00
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N
Top Groove 2.00
Top Ring Surface Treatment PHOSPHATE
GTIN 00075538059561