This hand tap rougher to DIN 5157 in HSSE is made for cutting a right hand internal thread in G (BSP) 1/8 x 28. Use it when the workpiece, drawing, or mating component requires this exact thread designation and when the selected tap stage matches the manual tapping sequence.
The rougher starts the internal thread and removes the first material portion before later tap stages continue the profile. G BSP identifies a parallel pipe thread used for pipe connections where sealing is normally handled by a separate sealing surface or seal element. The referenced thread standard is DIN ISO 228. HSSE is a cobalt alloyed high speed steel grade used where the manual cut is more demanding or heat input can be higher. Check the prepared hole, holder, lubrication, and alignment before use in mechanical engineering, service repair, plant maintenance, and small batch work.
- cutting or reworking internal G (BSP) 1/8 x 28 threads where the drawing or mating part requires this exact designation
- The rougher starts the internal thread and removes the first material portion before later tap stages continue the profile.
- right hand thread work in manual tapping setups and controlled repair operations
- selection by DIN 5157 tool dimensions and the stated thread standard where applicable
- pipe thread maintenance where the parallel G BSP thread must match the connection specification
- 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 G (BSP) 1/8 x 28, tap stage, thread direction, holder fit, and hole preparation before the tool enters the workpiece.
- HSSE cutting material is stated in the product data and supports selection by material execution instead of appearance
- DIN 5157 dimension reference helps you compare the tool with drawings, stock systems, and existing tool lists
- tolerance class medium gives a clear selection reference for the internal thread requirement
- rougher stage allows targeted replacement when only the starting tap from the sequence is required
- defined first stage helps control entry alignment before the intermediate or finishing stage
Drawbacks
- The product is only correct for G (BSP) 1/8 x 28 and the stated tap stage; use another item from Threading tools if thread, direction, or stage differs.
- Confirm that the component requires G (BSP) 1/8 x 28 and that thread direction matches the selected tool.
- Prepare the tapping hole and secure the workpiece so the tap can enter square to the surface.
- Select a suitable tap wrench or guided driving setup for the tap shank.
- Use the rougher to start the thread and remove the first cutting volume.
- Apply suitable cutting oil before the cutting edges engage the workpiece.
- Turn steadily and remove chips from the flutes at controlled intervals.
- Stop after roughing when the next tap stage is needed for profile completion.
- Clean the thread and verify the result with the mating part or an appropriate inspection method.
- 1 piece Hand Tap Rougher DIN 5157 HSSE - G (BSP) 1/8 x 28
- Product type: hand tap rougher
- Standard: DIN 5157
- Cutting material: HSSE
- Thread system: BSPP pipe thread
- Thread designation: G (BSP) 1/8 x 28
- Thread standard: DIN ISO 228
- Tolerance class: medium
- Thread direction: right hand
- Core hole diameter from product data: 8.8 mm
- Overall length L1: 63 mm
- Thread length L2: 20 mm
- Shank diameter D2: 7 mm
- Square k: 5.5 mm
- Packaging unit: 1
- Which exact thread is this product for?
- This product is for G (BSP) 1/8 x 28. G BSP identifies a parallel pipe thread used for pipe connections where sealing is normally handled by a separate sealing surface or seal element. The referenced thread standard is DIN ISO 228.
- Is this product for internal or external threads?
- This product is for internal threads. Use a round die when the workpiece needs an external thread.
- How do you choose the correct tap stage?
- Choose the stage by the manual tapping sequence. The rougher starts the internal thread and removes the first material portion before later tap stages continue the profile.
- What should be checked before ordering?
- Check thread system, size, pitch, standard, tolerance class where specified, and tap stage against the drawing or existing component.
- Where can you find technical background for hand taps?
- Use the Technical information hand taps as PDF.
- Can this product be used for repair or thread cleaning?
- Use it for re tapping or cleaning only when the existing internal thread is G (BSP) 1/8 x 28 and the thread condition still allows controlled cutting.
- Where can you compare inch based thread references with metric workshop units?
- Use the Inch to mm conversion table as PDF.
- How do you avoid selecting the wrong inch thread series?
- Compare thread family, nominal size, pitch in threads per inch, and direction. Similar inch sizes from different thread systems are not interchangeable.
- Where can you find the matching VÖLKEL threading tool catalog?
- Use the VD 23 catalog as PDF.
Do you need help selecting or using the product?
Use the contact form.
In this category: Threading tools
