Hand Tap Bottoming ISO 529 Form C HSS-G - UNF 1.3/8 x 12 | VÖLKEL
Hand Tap Bottoming ISO 529 Form C HSS-G - UNF 1.3/8 x 12
This tool is used to cut an internal thread in a drilled hole when you need repeatable form and fit. A hand tap gives you direct feedback on torque and alignment during the cut.
Use suitable lubrication and keep the cutting edges clear so torque stays stable. UNF indicates a Unified inch thread with a fine pitch series. HSS G indicates a ground high speed steel tool, typically used when you need consistent cutting geometry.
- Cut internal threads in drilled holes for fasteners, fittings, and mechanical assemblies.
- Use in mechanical engineering, metal fabrication, and maintenance work where controlled threading is required.
- Start the tap square to the hole to reduce risk of cross starting and uneven flank load.
- 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 For consistent results, deburr the entry and keep the cutting area clean during use.
- Controlled internal thread cutting with direct process feedback
- Suitable for repair work, prototyping, and general workshop machining
- Supports repeatable thread fit when the pre hole and alignment are correct
- Applicable across maintenance and production environments
Drawbacks
- Not suitable for brittle or abrasive materials without adapted cutting strategy and tool choice.
- Manual or guided threading can be slow for high throughput applications.
- Prepare the hole with a correct core diameter and a clean entry chamfer.
- Secure the workpiece and align the tool square to the hole axis.
- Apply suitable cutting lubricant for the material and process.
- Start the tool with controlled torque until it is guided by the thread form.
- Advance with steady turns or a guided feed while keeping alignment constant.
- Withdraw the tool at intervals and clear chips from the flutes.
- Continue until the required thread depth is reached, then remove the tool fully.
- Clean the thread and check fit with a matching screw or gauge.
- 1 piece Hand Tap Bottoming ISO 529 Form C HSS-G - UNF 1.3/8 x 12
- Tool type: Hand tap
- Reference standard: ISO 529
- Thread system: UNF
- Material or coating: HSS-G
- How do you confirm that the thread system matches the mating part?
- Match the designation on the tool to the drawing and the mating fastener or gauge. For inch and pipe threads, confirm thread family and fit class before you start machining.
- What does the designation UNF 1.3/8 x 12 mean on this tool?
- It defines the thread family and size that the tool is designed to produce or inspect. Use it only on matching parts and avoid mixing similar inch series.
- Where can you find technical information for hand taps?
- Use this document for handling concepts and selection basics. Technical information hand taps as PDF
- How do taper and second hand taps differ in use?
- A taper lead starts gently and helps alignment, while a second lead engages more quickly after starting. Select based on access, hole type, and how the thread is started.
- Where can you find a conversion table for inch and metric units?
- Use this table when you assign inch thread designations to metric workshop documentation. Inch to mm conversion table as PDF
- How do the material and coating designations affect selection?
- These designations describe tool material and surface treatment. Use them to match wear resistance and toughness needs to your material and process, without changing thread geometry.
- What are common causes of poor thread quality?
- Misalignment at the start, an incorrect pre hole, or insufficient lubrication can increase torque and damage flanks. Clean chips from the tool and verify setup rigidity.
- Where can you find catalog information for this product family?
- Use the product catalog for overview tables and selection context. VD 23 catalog as PDF
Do you need help selecting or using the product?
Use the contact form.
