Straight Flute Internal Coolant Carbide NPT Taps for Steel Cast Iron Brass

Short Description:

Carbide NPT taps are made from solid fine-grain tungsten carbide and engineered for machining 1:16 taper pipe threads to ASME B1.20.1, covering NPT 1/16″ to 2″

Material: Solid carbide, fine-grain tungsten carbide (WC-Co)
Substrate Hardness: HRA 91–93
Thread Standard: NPT taper pipe thread, compliant with ASME B1.20.1
Coolant: Internal coolant through holes, coolant delivered to the cutting zone
Coating: Uncoated / TiAlN / AlCrN / DLC (optional)

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Product Detail

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Bullet Points

Solid carbide body, high rigidity: one-piece fine-grain carbide keeps the cutting edge stable at high spindle speeds with minimal deformation.

Straight flute for reliable chip flow: chips travel straight out along the flute, giving predictable evacuation in cast iron, brass and blind holes.

Internal coolant, blind-hole ready: coolant reaches the cutting zone directly, combining cooling and chip flushing while reducing built-up edge and adhesion.

Three coatings matched to the workpiece: TiAlN for general wear resistance, AlCrN for high-temperature cutting, DLC for low friction, selected by material rather than one-size-fits-all.

Built to ASME B1.20.1: 1:16 taper and thread form held to standard and checked with an L1 ring gauge for dependable sealing after assembly.

Consistent threads for volume runs: stable go/no-go gauge results over long runs with a low breakage rate, reducing tool changes and downtime.

Broad size coverage with customization: NPT 1/16″–2″ available, with custom edge geometry, coating plans, OEM packaging and marking on request.

Applications

Plumbing and HVAC: taper pipe threads on fittings, couplings and valve bodies

Oil and gas: sealed threads on tool joints, wellheads and gathering-line fittings

Hydraulic and pneumatic systems: cylinder ports, air line connectors, threaded holes in pressure components

Instrumentation and valves: precision female threads in gauge bodies, sensor seats and ball or gate valve ports

Pumps, compressors and heat exchangers: volume tapping of housing ports and flange connections

MRO and spare parts: on-site thread repair and small-batch replacement parts

CNC mass production: automated tapping of automotive, construction machinery and fluid-control components

Hot Q&A

Can these taps handle blind holes? Is internal coolant required?

Answer:Yes. The straight flute plus internal coolant holes are designed for blind-hole work, with coolant travelling through the centre hole to the cutting edge, cooling and flushing chips at the same time. For blind holes, allow extra hole depth (thread length plus 2–3 pitches) and use internal coolant or generous external cooling to prevent chip packing.

How do I choose between TiAlN, AlCrN and DLC?

Answer: TiAlN is the general-purpose first choice for carbon steel, alloy steel and stainless steel; AlCrN offers better heat resistance for cast iron, dry or low-coolant and high-speed conditions; DLC provides low friction and anti-adhesion for non-ferrous materials such as aluminium and copper. If unsure, share the workpiece material and cutting parameters and we will recommend a coating.

Will they work on stainless steel, cast iron and hardened steel?

Answer: Stainless steel and all common grades of cast iron are standard applications, with a slight reduction in cutting speed and sufficient cooling. Hardened steel (roughly above HRC45) requires matched edge geometry and coating; we recommend a small trial batch to confirm parameters before volume production.

Do you cover all sizes? Can you customize or offer OEM?

Answer: We cover NPT 1/16″ to 2″ with common sizes held in stock; custom edge geometry, special coatings, OEM packaging and laser marking can be arranged per order. Send us the size, workpiece material, quantity and target parameters for a quotation and lead time.