Short Machine Tap Form C HSS-G - Rc (BSPT) 5/8 x 14

• Application: For general use, materials with good machinability up to 900 N/mm², unalloyed and low-alloy steels, for hand and machine use, for through and blind holes.
• Thread Type: Tapered pipe thread, taper 1:16, conical 55°
• Form: Form C
• Material: HSS-G
• Nominal Size: Rc (BSPT) 5/8 x 14
• EAN: 4022835637202
• Article Number: 63720

Short Machine Tap: A machine tap is a tool for cutting internal threads. It cuts the entire thread profile in a single operation, making it ideal for general use. The Form C designation refers to the chamfer form of the tap, which has a short lead with 2 to 3 threads. This allows for an easy start and facilitates cutting in both hand and machine applications.

Rc (BSPT): Rc and BSPT are designations for the same tapered pipe thread according to ISO 7 and DIN 2999, respectively. It is a sealing thread that creates a leak-tight connection without the need for additional sealants (like Teflon tape). The tapered shape of the male and female threads creates high compression when screwed together, which provides the seal. "Rc" stands for "Cone Taper Internal Thread," while BSPT stands for "British Standard Pipe Taper."

Taper 1:16: This specification describes the tapered profile of the thread. A taper of 1:16 means that the diameter of the thread increases or decreases by 1 mm over a length of 16 mm. This geometry is crucial for the self-sealing property of the thread, as the thread flanks jam into each other during tightening, creating a tight connection.

Conical 55°: This specification refers to the flank angle of the thread. A conical flank angle of 55° is the characteristic feature of the BSPT standard and differs from the metric ISO thread, which has a flank angle of 60°. This specific angle ensures compatibility with corresponding parts of the same standard.

Here's how to cut an internal thread with the short machine tap:

1. Preparation: Choose the correct tap for the thread you want to cut. Drill a hole with the correct core diameter (core diameter for 5/8-14 is 20.4 mm).
2. Lubricant: Apply a generous amount of cutting oil to the tap and into the drilled hole. This reduces friction and extends the life of the tool.
3. Starting the Cut: Place the tap vertically into the drilled hole. Begin to turn it slowly and carefully to start the thread.
4. Tapping: Turn the tap clockwise with uniform pressure. After every half to full turn, turn it back a quarter turn to break the chips and facilitate the cutting process.
5. Completion: Tap the thread to the desired depth. The tapered thread will cut itself into the material until it sits tightly.
6. Cleaning: Carefully remove the tap and clean the finished thread of any chips and oil.

1. What is the difference between a short machine tap and a tap set?

A short machine tap cuts the entire thread in one operation, while a tap set consists of three parts (taper, second, and bottoming taps) that cut a precise thread in stages. The short machine tap is faster, while the tap set is more suitable for harder materials or for achieving the highest precision.

2. What does the designation 5/8 x 14 mean?

This information describes the dimensions of the pipe thread. 5/8 is the nominal diameter in inches, and 14 is the number of threads per inch.

3. Why is this thread tapered?

The tapered profile (taper 1:16) ensures that the thread flanks jam into each other during tightening. This press fit creates a self-sealing connection that eliminates the need for additional sealants.

4. Can I use this tap for all materials?

No, it is designed for general use in materials with good machinability and unalloyed steels up to 900 N/mm². For harder materials or stainless steel, we recommend taps made from special materials such as HSSE-Co 5 or HSSE-PM.

5. What is the advantage of HSS-G material?

HSS-G stands for "High-Speed Steel" with ground cutting surfaces. This ensures high hardness, resistance to wear and heat, and a precise cutting edge, which leads to a longer tool life.