Hand Tap set of 2 pieces DIN 2181 HSS-G left hand thread - UNF 5/16 x 24 LH

VÖLKEL Two-Piece Hand Tap Set DIN 2181 HSS-G Left-Hand Thread – UNF 5/16 x 24 LH

Restore threads with precision and reliability! The VÖLKEL two-piece hand tap set DIN 2181 HSS-G Left-Hand Thread – UNF 5/16 x 24 LH is your go-to solution for manually cutting left-hand threads. This high-quality set is ideal for producing or repairing American fine threads (UNF) in easily machinable materials, whether in through holes or blind holes.

Complete Set for Left-Hand Thread Experts

This two-piece set is specifically designed for left-hand threads and includes two perfectly matched hand taps:

• Taper Tap (lead approx. 6-8 threads): The first tap in the set. Its long lead ensures easy alignment and guidance in the hole, reducing initial cutting force and protecting the tool.
• Plug Tap (lead approx. 2-3 threads): The second tap brings the thread to its final depth and profile, ensuring full accuracy.

Your Advantages

• Left-Hand Thread Specialist (LH): Essential for applications where left-hand rotation prevents loosening or is specifically required.
• Precision Two-Step System: Enables controlled, clean, and material-friendly thread cutting.
• Long Tool Life: Made from ground high-speed steel (HSS-G) for sharp cutting edges and high wear resistance.
• Versatile Use: Perfect for materials up to 900 N/mm², including unalloyed and low-alloy steels.
• Universal Application: Suitable for both through and blind holes, ideal for manual use.
• Certified Quality: Complies with DIN 2181 for hand taps and ANSI B1.1 (UNF threads).

Typical Applications

This left-hand tap set is used wherever screws must not loosen under right-hand rotation (e.g., drill chucks, grinding wheels) or where a left-hand thread is structurally required. Common uses include:

• Repairs on machinery, bicycles (pedals), motorcycles, and equipment
• Mechanical engineering, where anti-loosening features are needed due to vibrations or torque
• Maintenance and small series production

What is UNF?

UNF stands for Unified National Fine, a key category of the American Unified Thread Standard (UTS), widely used in the US and Canada. Fine threads like UNF have a smaller pitch than coarse threads (UNC), offering:

• Greater resistance to vibration
• Finer adjustment
• Higher load capacity in thin-walled materials
• Larger thread cross-section

UNF 5/16 x 24:

• 5/16: Thread diameter in inches (approx. 7.94 mm)
• 24: Threads per inch (TPI)

Left-Hand (LH) vs. Right-Hand (RH) Threads

• Right-Hand (RH): Standard direction; screws tighten clockwise.
• Left-Hand (LH): Reverse direction; screws tighten counterclockwise. Used to prevent unintentional loosening from opposing rotation or vibration (e.g., left pedal on a bicycle).

What is ANSI B1.1?

ANSI B1.1 is the American standard for Unified Inch Screw Threads, defining dimensions and tolerances for UN, UNC, UNF, UNEF, and UNS threads, ensuring compatibility with US hardware.

What is DIN 2181?

DIN 2181 is the German standard specifying dimensions and requirements for hand taps for both metric and inch fine threads, especially for two-piece sets—a mark of quality.

What does HSS-G mean?

• HSS: High-speed steel, known for hardness and toughness at high temperatures.
• G (ground): Indicates precision-ground cutting edges and flutes for:
• Sharper cutting edges
• Higher dimensional accuracy
• Longer tool life

Through Holes vs. Blind Holes

• Through Hole: Passes completely through the workpiece; chips can exit freely.
• Blind Hole: Has a bottom; chips must be cleared. The two-piece set is suitable for both, with the plug tap finishing the thread to the bottom.

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