Machine Tap JIS B-4430 Form C 35° Spiral Flute HSSE - UNF 5/32 x 36

VÖLKEL Machine Tap JIS B-4430 Form C 35° SP HSSE - UNF 5/32 x 36

Are you looking for a high-quality machine tap for cutting American fine threads in blind holes? Then the VÖLKEL Machine Tap JIS B-4430 Form C 35° SP HSSE - UNF 5/32 x 36 is your specialist! This tool is optimized for machine use and delivers precise, clean threads in free-cutting steels and other materials.

Manufactured from HSSE (High-Speed Steel with at least 5% cobalt content), this tap offers outstanding performance, especially under high cutting temperatures and in more demanding materials. The added cobalt significantly increases heat resistance and wear resistance, resulting in longer tool life and improved performance.

Your application advantages:

• Versatile use: Ideal for general applications in free-cutting materials up to 900 N/mm².

• Steel machining: Especially suitable for unalloyed and low-alloy steels.

• Blind hole specialist: The Form C with 35° spiral flutes is designed to efficiently transport chips backward out of the hole.

• American fine thread: Cuts a precise UNF (Unified National Fine) 5/32 x 36 thread.

JIS B-4430: Japanese standard for machine taps

JIS B-4430 is a Japanese Industrial Standard (JIS) that defines the dimensions and requirements for machine taps.

• JIS: Stands for Japanese Industrial Standard. These are developed by the Japanese Standards Association (JSA) and are renowned worldwide for their quality and precision.

• B-4430: The specific standard number that applies to taps. It defines details like geometry, tolerances, material requirements, and testing methods to ensure compatibility and performance.

Meaning: Compliance with this standard guarantees that the tap meets the specifications and quality demands of the Japanese market or manufacturer.

Form C 35° SP: The blind hole specialist with spiral flutes

Form C machine taps are characterized by spiral flutes. The additional specification "35° SP" further clarifies the flute design:

• Form C: Features angled spiral flutes that guide chips efficiently backward (toward the shank) out of the hole during tapping.

• 35° SP: "35°" refers to the helix angle. A 35° helix is typical for taps used in blind holes in standard materials. "SP" stands for Spiral Point or Spiral Flute.

Application: This geometry is the preferred choice for blind holes because it extracts chips from the thread bottom and carries them upward. This prevents chip jamming at the hole bottom, which could damage the tap or ruin the thread. It’s also beneficial when working with materials that tend to form long, tangled chips.

Comparison with other forms (e.g., Form B):

• Form B (straight flutes): Pushes chips forward and is ideal for through-holes.

• Form C (spiral flutes): Pulls chips backward and is ideal for blind holes.

HSSE: The material for demanding conditions

HSSE stands for High-Speed Steel with Cobalt content – a more powerful variant of standard HSS.

• With cobalt: Adding at least 5% cobalt significantly boosts the performance of HSS:

  • Increased hot hardness: The tool maintains its hardness even at high cutting temperatures. This is crucial for protecting the cutting edges from annealing.

  • Improved wear resistance: The cobalt content makes the material more resistant to abrasion and wear, resulting in significantly longer tool life.

Applications: HSSE tools are the first choice for machining hard-to-cut materials such as high-alloy steels, stainless steels, heat-resistant alloys, and other tough materials that exceed the capabilities of standard HSS.

UNF: Unified National Fine thread

UNF stands for Unified National Fine, one of the main thread types under the Unified Thread Standard (UTS) used in the USA and Canada.

• Unified Thread Standard (UTS): The common standard for screw and bolt threads in the U.S. and Canada. It’s based on inch dimensions, not metric.

• Fine thread (F): Within UTS, several thread series exist. "F" or "Fine" indicates a finer pitch compared to coarse threads (UNC – Unified National Coarse).

Advantages of fine threads:

• Better resistance to vibration

• More precise adjustment

• Higher load capacity at the same nominal diameter, especially in thin-walled materials due to larger thread cross-section

Drawback: More susceptible to damage and more difficult to manufacture.

UNF 5/32 x 36 Designation:

• 5/32: Nominal thread diameter in inches. 5/32 inch ≈ 3.96875 mm

• 36: Number of threads per inch (TPI – Threads Per Inch). There are 36 threads along one inch.

ANSI B1.1: American Standard for Unified Inch Screw Threads

ANSI B1.1 is an American National Standard that defines dimensions and tolerances for Unified Inch Screw Threads (UN, UNC, UNF, UNEF, UNS).

• ANSI: Stands for American National Standards Institute, the main organization in the U.S. responsible for developing and accrediting standards.

• B1.1: The specific standard relating to Unified Screw Threads, including the UNF thread in this product.

Meaning: Compliance with ANSI B1.1 ensures that the UNF thread cut by this tap meets U.S. standards and is compatible with corresponding American screws and nuts. It defines all geometric parameters such as flank angle (60°), pitch, nominal diameter, thread profile, and related tolerances.

Application:

for general use

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