Hand Tap set of 3 pieces DIN 352 HSS-G - BSW 1.1/4 x 7

VÖLKEL Hand Tap 3‑Piece Set DIN 352 HSS‑G – BSW 1¼ × 7

For manually creating robust Whitworth threads in a wide range of materials, the VÖLKEL Hand Tap 3‑Piece Set DIN 352 HSS‑G – BSW 1¼ × 7 is your indispensable companion! This set includes all three required taps for precise, step‑by‑step manual threading—suitable for through‑holes and blind holes alike.

Made from HSS‑G (ground high‑performance high‑speed steel), these taps ensure sharp cutting edges, excellent wear resistance, and long service life even under heavy use.

Your application advantages:

• Versatile use: Ideal for commonly machinable materials up to 900 N/mm² tensile strength.

• Steel machining: Especially suited to unalloyed and low‑alloy steels.

• For through‑ and blind‑holes: The 3‑piece set works universally in both types.

• Hand use: Optimized for use with a tap wrench.

This set cuts a precise Whitworth BSW 1¼ × 7 thread to BS 84 standard.

What’s in the 3‑piece set?

A classic three‑piece hand tap set comprises:

1. Plug (first) tap – long chamfer (6–8 threads): Prepares the thread start.

2. Intermediate tap – shorter chamfer (4–5 threads): Deepens the thread.

3. Bottom (finishing) tap – shortest chamfer (2–3 threads): Completes the thread to full depth and tolerance.

Using them in sequence ensures clean, dimensionally accurate threads—especially in tougher materials or larger sizes.

Advantages of a 3‑piece set

• Tool-friendly: Material removal is shared, reducing stress on each tap.

• Improved thread quality: Gradual cutting yields cleaner profiles and fewer defects.

• Less manual effort: Easier to start and smoother cutting.

• Versatile hole types: Chamfered taps handle both through and blind holes efficiently.

• Low breakage risk: Stepwise approach reduces the chance of tap breakage.

DIN 352 – Standard for hand taps

DIN 352 is a German standard specifying dimensions and requirements for hand taps.

• Specifically designed for manual operation.

• Defines geometry for plug, intermediate, and bottom taps.

• Robust construction ensures durability while hand‑tapping.

BSW – British Standard Whitworth thread

BSW (British Standard Whitworth) is a historic yet still widely used thread standard.

• Invented by Sir Joseph Whitworth in the 19th century.

• Features a 55° flank angle and rounded roots and crests.

• BSW 1¼ × 7: Diameter 1.25 inches (~31.75 mm), 7 threads per inch—coarse and durable.

• BS 84 standard ensures compatibility with Whitworth hardware.

Application:

for general use

• non abrasive material up to 900 N/mm²
• unalloyed and low alloyed steel
• for through and blind holes
• for thread cutting by hand