找到兩點這麽說的

Thou shall oil thine air inlet daily with Air Tool Oil and Grease but once a month... Grease? Yes. The tiny ball bearing at the front of the gun, just beneath the anvil (where the 1/2" socket articulates to the tool) is a grease port that fits a "Mini" or "Needle" air tool grease gun. Just a dab will do before it back flows out of the port. Remember, you're greasing an air tool, not the ball joint of a semi truck. [The AIRCAT® tools require the minimum standards below to keep your tool in good working condition.（Amazon）

Twin Hammer- Use Lithium or bearing grease. One pump every few weeks is all you need.(http://aircat.com/faq/)

注入口是鋼珠頂住的，露出的鋼珠直徑約1-1.5mm。槍找到一把不是合用否：http://www.amazon.com/Ingersoll-Rand-67-LBK1-Care-Grease/dp/B000E0TC8C/ref=sr_1_1?ie=UTF8&qid=1449453563