HSS-Co Straight Flute Pipe Tap | G / NPT / RC / PT / ZG

HSS-Co Machine Tap

For machine tapping / CNC use where applicable. Use suitable cutting fluid and select speed according to thread size, workpiece material, tap geometry and machine conditions. The original reference range shown for this product is 500–800 rpm.

①Straight flute with spiral point.

②Straight flute

③Spiral flute

④Fluteless

Pipe Tap Geometry

The front section is slotted, with chip evacuation on top for easy reconditioning. It is suitable for through holes and blind holes, and can be used on copper or steel materials below 20 degrees.

Application

Common pipe-thread sizes are shown below.

Common Pipe Thread Sizes
2 Inch Pipe
4 Inch Pipe
6 Inch Pipe

Select the Tap According to the Thread

The table below lists the tap sizes corresponding to different pipe sizes
Use the table below to match the tap specification to the required pipe thread.
Tap Specification
Thread Specification

Select Tap According to the Fitting

Tap Specification
Thread Specification

01 This connection features a 55° Whitworth non-sealing straight pipe thread, where the
outer diameter and inner diameter sizes of the thread are not the same.

02 It is recommended to use calipers for measurement to avoid specification selection errors due to inaccurate measurements.

03 When measuring the diameter, there may be deviations due to thread wear; select the tap size that is closest to the measured size. If still uncertain, contact customer service for recommended sizes.

04 Threads designated as G and BSP are both British Standard Pipe Taper (BSPT) thread
designations with a 55-degree thread angle

Specific Details of Tap Specification

Model Code
The Numbde of Threads Per25.4mm,n
Pitch(P)
TheMajor Diameter(Basic Diameter)d=D
Tap Hole Specification

Specification Sheet

ZG-55°：
English Taper Pipe Thread
Accuracy: ISO Class 2
Chip Disposal: Downward chip disposal
Material: HSS-6542

Z-60°：
American Standard Taper Pipe Threads for Sealing
Accuracy: ISO Class 2
Chip Disposal: Downward chip disposal
Material: HSS-6542

G-55°：
American Standard Straight Pipe Threads for Non-Sealing
Accuracy: ISO Class 2
Chip Disposal: Upward Chip Disposal
Material: HSS-6542

Specification Sheet

1/2 indicates the size of the pipe thread (1/2 inch, commonly known as a four-inch pipe).
14 represents the number of threads per inch (14 threads per inch), so the pitch is 25.4/14.
‘Ｚ’ denotes a 60-degree taper pipe.
‘ZG’ signifies a 55-degree taper pipe.
‘G’ refers to a 55-degree straight pipe thread,
(which is suitable for non-sealing pipe thread processing).
All taps are fully ground (except for the square end of the shank).

G1/8 - The nominal size for the internal bore diameter is 1/8 inch, corresponding to an
external thread diameter of 9.728 mm

G1/4 - The standard dimension for the internal bore diameter is 1/4 inch, with an
external thread diameter of 13.157 mm

G3/8 - The designated size for the internal bore is 3/8 inch, while the nominal outer
thread diameter measures 16.662 mm

G1/2 - The standard dimension for the internal bore diameter is 1/2 inch, with a
nominal outer thread diameter of 20.955 mm

G3/4 - The specified internal bore diameter is 3/4 inch, corresponding to a nominal
outer thread diameter of 26.441 mm

G1 - The standard internal bore diameter is 1 inch, with a nominal outer thread
diameter of 33.249 mm

Thread Designation

G-55 ° non-sealing cylindrical pipe thread system
ZG-55 ° sealing conical pipe thread system
Z-60 ° American taper pipe thread system
NPT-60 ° American standard pipe thread taper pipe thread system
PT-55 ° British Standard Pipe Thread Taper Pipe Thread System
PF-55 ° British non-sealing cylindrical pipe thread system
RP-55 ° British Standard Sealed Cylindrical Internal Thread System
RC-55 ° British sealed cylindrical internal thread system

Instructions for Use

01、Put the Matching Tap Into the Thread
02、Screw it in Clockwise With a Universal Wrench
03、Then Screw it out Counterclockwise
04、The Thread Repair is Complete

Ground Thread Geometry Standard Pitch

Tapping resistance is smaller than common taps, it is the choice of through hole machining, standard tooth pitch, no damaged teeth, no burrs.

Ground Cutting Edge

The cutting edges are ground for stable thread cutting and controlled surface finish.

Square Drive

Square drive for use with a compatible tap wrench or machine tap holder.

Tapping Speed Reference

Tapping speed depends on workpiece material, pilot-hole condition, tap geometry, coating, cutting fluid and machine capability. Use the reference table below as a starting point and adjust to actual machine and workpiece conditions.