Snap-on Torque question?

[ijason]

Hi I'm trying to understand what snap-on means on the accuracy of there qd line of torque wrenches here is what they say (accurate to ±4% clockwise and ±6% counterclockwise from 20% of full scale to full scale)

so a 1/2 inch drive 30-150 ftlb will torqueing wheel lug nuts at 100ft be accurate or not? or when dose this spec of torque wrench become the most accurate between what and what?

here is the one I'm looking at http://buy1.snapon.com/catalog/item...up_id=675227&supersede=&store=canada&tool=all

thank you
Jason

 

[pi_guy]

Normally middle of the range is more accurate than being near the minimum or the maximum range.

 

[Zrexxer]

Hi I'm trying to understand what snap-on means on the accuracy of there qd line of torque wrenches here is what they say (accurate to ±4% clockwise and ±6% counterclockwise from 20% of full scale to full scale)

If it's rated for 30-150, then 150 is full scale. 20% of full scale is 30. SO from 30-150, it's accurate to within 4% clockwise, and 6% counterclockwise.

If you're torquing a right-hand thread to 100 ft-lbs, the actual value will be somewhere between 96-104 ft lbs. If you're torquing a left-hand thread (counterclockwise) then that value will be between 94-106 ft-lbs.