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
