Spiral drill for STI systems with optimal chip removal and accuracy.

STI-Twist Drill, 7.3 mm

Item no. 00073

€3.15

in stock - more than 100 pieces available

VÖLKEL delivers exclusively to specialized dealers. Online you can buy VÖLKEL products here.

The prices are in Euro plus VAT and shipping, insurance and packaging costs.

Application

You use this STI twist drill to prepare the hole before cutting the receiving thread for a V-COIL insert. In a repair workflow, the drill is selected by the stated diameter and the repair size rather than by the finished screw thread alone.

The drill belongs to the preparation stage before STI tapping and insert installation. It is used in workshop and maintenance repairs where the original thread has to be restored with a wire thread insert system.

Application

for cutting the oversize STI receiving thread before installing a V-COIL wire thread insert
for 7.3 when the insert system, pitch, and original thread specification match
for STI tapping after the repair drilling operation has been completed
for preparation of receiving threads for wire thread inserts in thread repair work
Process: manual driving or assisted driving depending on your holder and machine setup
Use: thread cutting, re tapping, and thread cleaning depending on condition

Note Match STI tools to the wire thread insert system and do not use an STI tap as a standard finished-thread tap.

Benefits

STI geometry is intended for the receiving thread used by wire thread inserts rather than a standard finished thread.
The stated material and standard data support controlled selection for professional thread repair.
The thread designation 7.3 helps you match tap, insert, and original thread requirement.
Using a dedicated STI tap reduces the risk of installing the insert in an incorrectly sized receiving thread.

Drawbacks

An STI tap is not suitable for producing a standard internal thread, so use a normal tap when no insert repair is planned.

Step by step

Identify the original damaged thread and select the matching V-COIL insert system.
Prepare the hole with the required repair drilling step before tapping.
Clamp the STI tap in a suitable holder or machine setup with correct alignment.
Cut the STI receiving thread using the workshop process for the material and hole type.
Clean the receiving thread before inserting the wire thread insert.
Install the matching V-COIL insert with the appropriate inserting tool.
Remove the tang where the repair process requires it.
Inspect the repaired thread before returning the component to service.

Scope of supply

1 piece STI-Twist Drill, 7.3 mm

Technical features

Product type: STI twist drill
Thread system: STI
Thread designation: 7.3
Material: HSS-G
Size range: 7.3
Package quantity: 10
Drill diameter: 7.3

Frequently asked questions (FAQ)

Is this tap for a standard finished internal thread?

No, it cuts the oversize STI receiving thread used before a V-COIL wire thread insert is installed.

How do you choose the correct STI tap?

Choose the STI tap by the original thread, insert system, thread designation 7.3, tap form, and hole type in the workpiece.

Why does STI selection differ from normal tapping?

STI tapping prepares the receiving thread for the insert, while the installed insert later provides the usable finished thread for the screw.

What should you check before using the STI tap?

Check the drilling step, alignment, insert type, hole depth, and whether the selected tap form fits through-hole or blind-hole work.

Where can you find V-COIL repair information?

Additional V-COIL repair guidance is available here: Technical information V-COIL thread repair as PDF

Can this tap replace an inserting tool?

No, the STI tap cuts the receiving thread, while a separate inserting tool drives the wire thread insert into that thread.

Where can you find the V-COIL catalog?

You can find the thread repair catalog here: VC 23 catalog as PDF

Do you need help selecting or using the product?
Use the contact form.

In this category: Thread repair

Additional information

Size	Nominal diameter D 7.3 mm
Item number	00073

Application

for cutting the oversize STI receiving thread before installing a V-COIL wire thread insert
for 7.3 when the insert system, pitch, and original thread specification match
for STI tapping after the repair drilling operation has been completed
for preparation of receiving threads for wire thread inserts in thread repair work
Process: manual driving or assisted driving depending on your holder and machine setup
Use: thread cutting, re tapping, and thread cleaning depending on condition

Note Match STI tools to the wire thread insert system and do not use an STI tap as a standard finished-thread tap.

Benefits

STI geometry is intended for the receiving thread used by wire thread inserts rather than a standard finished thread.
The stated material and standard data support controlled selection for professional thread repair.
The thread designation 7.3 helps you match tap, insert, and original thread requirement.
Using a dedicated STI tap reduces the risk of installing the insert in an incorrectly sized receiving thread.

Drawbacks

An STI tap is not suitable for producing a standard internal thread, so use a normal tap when no insert repair is planned.

Step by step

Identify the original damaged thread and select the matching V-COIL insert system.
Prepare the hole with the required repair drilling step before tapping.
Clamp the STI tap in a suitable holder or machine setup with correct alignment.
Cut the STI receiving thread using the workshop process for the material and hole type.
Clean the receiving thread before inserting the wire thread insert.
Install the matching V-COIL insert with the appropriate inserting tool.
Remove the tang where the repair process requires it.
Inspect the repaired thread before returning the component to service.

Scope of supply

1 piece STI-Twist Drill, 7.3 mm

Technical features

Product type: STI twist drill
Thread system: STI
Thread designation: 7.3
Material: HSS-G
Size range: 7.3
Package quantity: 10
Drill diameter: 7.3

Frequently asked questions (FAQ)

Is this tap for a standard finished internal thread?

No, it cuts the oversize STI receiving thread used before a V-COIL wire thread insert is installed.

How do you choose the correct STI tap?

Choose the STI tap by the original thread, insert system, thread designation 7.3, tap form, and hole type in the workpiece.

Why does STI selection differ from normal tapping?

STI tapping prepares the receiving thread for the insert, while the installed insert later provides the usable finished thread for the screw.

What should you check before using the STI tap?

Check the drilling step, alignment, insert type, hole depth, and whether the selected tap form fits through-hole or blind-hole work.

Where can you find V-COIL repair information?

Additional V-COIL repair guidance is available here: Technical information V-COIL thread repair as PDF

Can this tap replace an inserting tool?

No, the STI tap cuts the receiving thread, while a separate inserting tool drives the wire thread insert into that thread.

Where can you find the V-COIL catalog?

You can find the thread repair catalog here: VC 23 catalog as PDF

Do you need help selecting or using the product?
Use the contact form.

In this category: Thread repair

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