Hastings 4.000"/101.6 mm Bore +.040" Over Size, Single Cylinder Ring Set with 2.00 mm Top Ring, 2.00 mm Second Ring and a First Oil Ring is 4.75 mm.
This Hastings Single Cylinder Ring Set has a top ring manufactured from steel with plasma moly 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
1985-1994 Chevrolet Astro
1988-1995 Chevrolet C1500
1988-1995 Chevrolet C2500
1985-1990 Chevrolet Caprice
1985-1987 Chevrolet El Camino
1985-1995 Chevrolet G10
1985-1995 Chevrolet G20
1985-1995 Chevrolet G30
1985 Chevrolet Impala
1988-1995 Chevrolet K1500
1988-1995 Chevrolet K2500
1985-1988 Chevrolet Monte Carlo
1990-1995 Chevrolet P30
1987 Chevrolet R10
1987 Chevrolet R20
1988-1995 Chevrolet S10
1988-1994 Chevrolet S10 Blazer
1987 Chevrolet V10
1985-1986 GMC C1500
1988-1995 GMC C1500
1985-1986 GMC C2500
1988-1995 GMC C2500
1985-1987 GMC Caballero
1985-1995 GMC G1500
1985-1995 GMC G2500
1985-1995 GMC G3500
1992-1994 GMC Jimmy
1985-1986 GMC K1500
1988-1995 GMC K1500
1985 GMC K2500
1988-1995 GMC K2500
1990-1995 GMC P3500
1987 GMC R1500
1987 GMC R2500
1988-1990 GMC S15
1988-1991 GMC S15 Jimmy
1985-1994 GMC Safari
1991-1995 GMC Sonoma
1987 GMC V1500
1991-1994 Oldsmobile Bravada
1986 Pontiac Bonneville
1986-1987 Pontiac Grand Prix
1985-1986 Pontiac Parisienne
Attributes
1st Oil Groove 4.75
1st Oil Ring Material STEEL RAIL/STAINLESS EXP
2nd Groove 2.00
2nd Ring Surface Treatment PHOSPHATE
Alternate Part Number 2M5712S.040
California Proposition 65 No
Engborein 4.000
Engboremetric 101.60
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
Notes W/Deep Oil Grv.
SDR Required Flag N
Top Groove 2.00
Top Ring Surface Treatment PLASMA MOLY
GTIN 00075538152996