Fastener Types - Xerox Phaser 7400 Service Manual

Fastener Types

The following table lists the primary types of Posi-Drive screws used to assemble the
printer. The procedures provide dimensional specifications for screws being removed.
Posi-Drive Screw Types used in the Printer
Type Application
Self-tapping,
plastic
Parts etc
Self-tapping,
plastic with
flange
Parts etc
Sheet Metal,
silver
Parts etc
Sheet Metal.
with flange
Parts etc
Lock Washer
Sheet Metal,
silver with
lock washer
Parts Etc. Sheet Metal
Sheet Metal,
silver with
toothed
washer
Parts etc
Caution
Use care when installing self-tapping screws in plastic. To properly start the
screw in plastic, turn the screw counter-clockwise in the hole until you feel the
screw engage the threads, then tighten as usual. Failure to properly align or over
tighten the screw can result in damage to previously tapped threads.
Service Parts Disassembly
Shape
Plastic
Plastic
Sheet metal
Sheet metal
Sheet metal
Characteristics
1. Black colored.
2. Screw thread is coarse
compared to metal screw.
Coarse
3. Screw tip is thin.
1. Black colored.
2. It has a flange.
3. Screw thread is coarse
Coarse
compared to metal screw.
4. Screw tip is thin.
1. Silver colored.
2. Diameter is uniform.
1. Silver colored.
2. It has a flange.
3. Diameter is uniform.
4. Typically 6 mm or 10 mm in
length.
1. Silver colored.
2. Diameter is uniform.
3. Typically 6 mm in length.
1. Silver colored.
2. Includes a toothed washer.
3. Diameter is uniform.
4. Used for grounding terminals.
8-7