is the same bushing as an “SF” without the knurl on the head
and with only the fixed notch for the lockscrew.
are less costly.
are a good choice for applications where the bushing is not removed for
each cycle and the order quantity for each bushing size is greater.
are not listed in this catalog; however, we do have limited stock and
find this to be preferred by many customers. Use the “SF”
data pages 14 –16 for size information.
for more information.
Headless Press Fit
between the Fixed bushing and the fixture plate, the Headless Liner Bushing
is much like the Type P bushing. It is pressed into a fixture plate to
provide a permanent, precision location for Slip/Fixed or Fixed type bushings
Head Press Fit
liners are the same as the “L” liners with a head or collar
at the top.
liners are used in applications where there is concern about axial load
pushing the liner out of place in the fixture plate.
usually pressed into counterbored holes for flush mounting as shown above.
Drill Bushings Type GD
Gun drills are
used where maximum precision for long, deep holes is essential.
- Types GD and GDX
are single piece construction.
- The other type
of Gun Drill bushing is two piece construction. It consists of a Liner
(GDL) and an Insert (GDI). The Insert can be removed from the Liner
thus allowing for a range of I.D. sizes using the same Liner.
- National can make
special Gun Drill bushings to fit your exact requirements.
Bushings Type OG
Oil Groove Bushings provide
lubrication or coolant directly into the bushing.
- Used for drill
lubrication or as a bearing.
- Lubricant flows
through the bushings to the grooves in the I.D. wall.
- 25 oil groove styles
are available; see page 21 for details.
- Oil groove bushings
are available headless and with heads.
These are bushings
in sizes larger than ANSI or National standards. Available in P, H, SF,
F, L and HL. Unground O.D.’s available for custom grinding.
Extended Range Bushings
wall thickness and head diameters save space. They are as durable as regular
wall thickness bushings and are used where extremely close hole patterns
must be accurately drilled. Available in Type P, H, F and SF.
Note: Thinwall bushings are not necessarily round in the
Tungsten Carbide Bushings
is extremely hard(Rc 78 – 80) and can last 50 times longer than
conventional steel bushings. Carbide bushings are available in Type CP,
CH and CS.
Titanium Nitride (TIN) Coated Bushings
TIN is a hard, non-abrasion
type coating that is yellow in color. It is a good alternative to carbide
extending the life of the bushing without the cost of carbide.
Special Bushings and Other Products
range from modified standard bushings typically I.D., O.D. or length changes,
to bushings that are custom designed for your application. We offer a
wide range of materials such as brass, aluminum and plastic.
We also manufacture
special non-bushing items such as shafts, tool holders, rest bottoms and
pins per your specifications. Please call for information.