Technical Specifications

*Trademark of the E.I. DuPont Company

Procedure for Cutting Threads in Schedule

80 Pipe

1. Cutting

The pipe must be cut square using a power saw, a miter box,

or a plastic pipe cutter. Burrs should be removed using a knife

or deburring tool.

2. Threading

Threads can be cut using either hand held or power threading

equipment. The cutting dies should be clean, sharp, and in good

condition. Special dies for cutting plastic pipe are available

and are recommended.

When using a hand threader, the dies should have a 5° to 10°

negative front rake. When using a power threader, the dies

should have a 5° negative front rake and the die heads should

be self-opening. A slight chamfer to lead the dies will speed

production. However, the dies should not be driven at high

speeds or with heavy pressure.

INSTALLATION PROCEDURES

When using a hand held threader, the pipe should be held

in a pipe vise. To prevent crushing or scoring of the pipe, a

protective wrap such as emery paper, canvas, rubber, or a light

metal sleeve should be used.

Insert a tapered plug into the end of the pipe to be threaded.

This plug will provide additional support and prevent distortion

of the pipe in the threading area.

It is recommended that a water soluble machine oil, chemically

compatible with PVC and CPVC, be used during the threading

operation. Also, clearing the cuttings from the die is highly

recommended.

Do not over-thread the pipe. Consult the diagram and table

showing ASTM F 1498 dimensions for American Standard

Taper pipe threads. Periodically check the threads with a ring

gauge to ensure that the threads are accurate. The tolerance

is ±1

⁄2 turns.