THK Original Grease AFG Grease

AFG Grease is a high-grade grease for ball screws that uses high-grade synthetic oil as its base and a urea-based grease as its consistency enhancer. This ensures that it has superior low heatgenerating properties, allowing for use over a wide temperature range—from low to high temperatures.

Features

• Low heat generation

Since the viscous resistance is low, the grease generates only a minimal level of heat even during high-speed operation.

• Low torque properties

Features a low base oil kinematic viscosity, making it ideal for ball screws.

• Water resistance

AFG Grease is a highly water-resistant grease that is less vulnerable to softening and reductions in extreme pressure resistance due to moisture penetration.

Representative Physical Properties

Item		Representative value	Test method
Consistency enhancer		Urea-based
Base oil		High-grade synthetic oil
Base oil kinematic viscosity: mm²/s (40°C)		25	JIS K 2220 23
Worked penetration (25°C, 60 W)		285	JIS K 2220 7
Mixing stability (100,000 W)		329	JIS K 2220 15
Dropping point: °C		261	JIS K 2220 8
Evaporation amount: mass% (99°C, 22 h)		0.2	JIS K 2220 10
Oil separation rate: mass% (100°C, 24 h)		0.5	JIS K 2220 11
Copper plate corrosion (B method, 100°C, 24 h)		Accepted	JIS K 2220 9
Low-temperature torque: mN-m (‒20°C)	Starting	170	JIS K 2220 18
	Rotational	70
4-ball testing (welding load): N		3089	ASTM D2596
Service temperature range: °C		‒45 to 160
Color		Brown

Low Heat Generation Test Data

Item	Description
Tested model	SBN3210-7RRG0+1094LC5 (Pre-load only)
Rotational speed	400 to 3000min⁻¹
Grease quantity	12cm³ (initial lubrication only)
Temperature measure- ment point	Nut outer diameter area

Ball Screw Torque Data

Item	Description
Tested model	SBN3210-7RRG0+1094LC5 (Pre-load only)
Rotational speed	2 to 1200min⁻¹
Amount of lubricant injected	13cm³ (initial lubrication only)