All American Products Co.

APPLICATION DATA: The press fit, type P, drill bushing is the most popular and least expensive. This bushing is permanently pressed into the jig plate or fixture and is generally used where replacement due to wear is not anticipated during the life of the tooling and where a single operation such as drilling only or reaming only is performed. Headless press fit bushings offer two advantages: they can be installed flush with the jig plate without counterboring the mounting hole and they can be mounted closer together than headed bushings. However, where space permits, the use of head press fit bushings is preferable in any application where heavy axial loads may eventually force a headless bushing out of the jig plate.

The head press fit, type H, drill bushing is similar to the headless press fit except that it has a head or shoulder on the drill entry end and the jig plate or fixture must be counterbored for flush mounting. This bushing is permanently pressed into the jig plate or fixture and is generally used where replacement due to wear is not anticipated during the life of the tooling and where a single operation such as drilling only or reaming only is performed. The head press fit bushings are preferable in any application where heavy axial loads may eventually force a headless bushing out of the jig plate

The slip fixed renewable, Type SF, is used in conjunction with a liner or headliner (L or HL). The unique design of this versatile drill bushing offers the combined design of both the slip and the renewable bushing (S and F). It is recommended for long production runs where more than one operation is performed in the same hole, such as drilling, then reaming or counterboring. There is a slot milled in the knurled head of the slip fixed renewable which enables a lockscrew or clamp to hold the bushing in place or easily remove it.

The fixed renewable, Type FM, drill bushing is the ideal design for long production runs where the number of parts to be drilled or reamed is greater than the normal wear life of the drill bushing. This type is used in conjunction with a liner, Type L or HL bushing and is secured in place by a lock screw or clamp. The unique design allows easy replacement. Simply remove the lock screw or clamp without removing the jig or fixture from the production line.

The liner bushing, Type L, is used with All American A.N.S.I. renewable drill bushings and is permanently pressed into a drill jig or fixture plate. The liner drill bushing provides a precise and stable location for renewable drill bushings in addition to protecting the hole in the jig plate from wear caused by frequent drill bushing replacement. The inside diameter is ground for correct slip fit with renewable drill bushings. The liner drill bushings can be installed flush with the jig plate without counterboring the mounting hole and they can be mounted closer together than the headliner. The headliner bushings are preferable where space permits and when heavy axial loads are anticipated.

The head liner, Type HL, drill bushing is similar to the liner drill bushing except that it has a head or shoulder on the drill entry end and the fixture may be counterbored for flush mounting.

Castable bushings are made for potted, cast in place or imbedment in jigs made of laminated glass fibers, potting compounds, castable and soft materials. All three basic types, the diamond groove, type DG, the serrata groove, type SG, and the serrata press, type SP, offer exceptional self-locking grip and holding power.

The diamond groove, type DG, features a special knurl which makes it superior in holding strength.

The serrata groove, type SG, features a special serration which allows the bushing to be easily pressed into a jig made of plastic or soft materials and offers excellent holding strength.

The serrata press, type SP, features a special serration and a finish ground O.D., outside diameter, which makes it superior for press-in installation in soft materials, such as magnesium, aluminum, masonite, or wood.
*Points to consider when selecting a castable bushing suited for a particular application:
1. Type of material and its hardness and ductility, and
groove sensitivity.
2. Maximum load to be transferred onto the bushing.