ALL AMERICAN circuit board
bushings are designed to fit a variety of circuit board drilling machines.
I.D. TOLERANCES - All
American & ANSI Standard:
| Standard Drill Sizes |
I.D. |
Tolerance |
| #55 - 1/4 |
Nom |
+.0001/+.0004 |
| Over 1/4 - 3/4 |
Nom |
+.0001/+.0005 |
| Over 3/4 - 49/64 |
Nom |
+.0002/+.0006 |
STANDARD SIZES:
Standard sizes in a given I.D. range are sizes listed in the decimal equivalent
chart either as a fraction, number or letter size. Any other decimal or
millimeter size within a given range is considered special and will be priced
accordingly.
DRILL
BEARING LENGTH:
1-1/2 times I.D. (A) diameter.
STEEL:
Our bushings are manufactured from selected steels known for their long
wear and stability. Bushings are also available from other materials at extra
cost (bronze, M-2, D-2, stainless steel, etc.)
HARDNESS:
Rockwell C 62 - 64 in the hole.
NOTE: All headed carbide bushings are furnished with steel heads
