Official "The industrial maintainance uplift with superior products"
century.lubes@gmail.com
Page 12 Technical Documentation

Comparative Classification of Viscosities

Authoritative engineering conversion matrix bridging ISO 3448, AGMA, SAE Engine, SAE Gear, and Engler standards.

Bidirectional Lookup

Select an ISO Viscosity Grade to instantly calculate its standardized equivalents across all industrial and automotive rating systems.

Equivalent Values: ISO VG 220
Kinematic 40°C 220 cSt
Kinematic 100°C 19.4 cSt
AGMA Gear AGMA 5
SAE Motor (J-300) SAE 50
SAE Gear (J-306) SAE 90
Engler Degrees 28.5 °E
Kinematic viscosities measured at 40°C and 100°C in mm²/s (cSt) per ASTM D 445 / ISO 3104.

ISO 3448 & Comparative Standards Table

Standardized comparison table correlating industrial viscosity classifications across North American, European, and International bodies.

ISO VG cSt @ 40°C cSt @ 100°C AGMA SAE Motor SAE Gear Engler 50°C
ISO VG 10 10 2.5 - - - 1.5
ISO VG 15 15 3.2 - - - 2.0
ISO VG 22 22 4.1 - 5W - 2.7
ISO VG 32 32 5.4 - 10W 75W 3.8
ISO VG 46 46 6.8 1 15W - 20 75W 5.5
ISO VG 68 68 8.7 2 20 80W 8.2
ISO VG 100 100 11.4 3 30 / 25W-30 80W / 85W 12.0
ISO VG 150 150 15.0 4 40 85W / 90 18.0
ISO VG 220 220 19.4 5 50 90 27.0
ISO VG 320 320 24.5 6 60 90 38.0
ISO VG 460 460 31.2 7 - 140 55.0
ISO VG 680 680 38.5 8 - 140 80.0
ISO VG 1000 1000 48.0 8A - 250 120.0
ISO VG 1500 1500 62.0 8A+ - 250 180.0
Original Technical Chart (Sheet 12)

This chart from our official engineering catalog illustrates the exact continuum of viscosities from ISO 10 to ISO 1500, Saybolt Universal Seconds, and Engler curves.

Century Comparative Classification of Viscosities Chart
Click to enlarge sheet 12
Engineering Reference

Understanding Viscosity Classification Systems

Viscosity is the single most critical physical property of an industrial lubricant. Choosing the correct grade prevents boundary wear, micropitting, and hydrodynamic drag.

ISO 3448 (Industrial VG)

The international standard for industrial liquid lubricants. The ISO VG number represents the midpoint kinematic viscosity in centistokes (cSt or mm²/s) at a standardized reference temperature of 40 °C with an allowable tolerance of ±10%.

AGMA Lubricant Numbers

Defined by the American Gear Manufacturers Association for enclosed industrial gear drives. Standard numbers range from AGMA 1 (ISO 46 equivalent) to AGMA 8A (ISO 1000 equivalent) for high shock-load open and closed gear trains.

SAE J-300 & SAE J-306

Society of Automotive Engineers ratings. SAE J-300 governs crankcase/engine lubricants (with 'W' denoting low-temperature winter pumping limits). SAE J-306 governs axle and manual transmission gear oils (e.g. 75W-90, 85W-140).