HDD DRILL-STRING CONNECTION TOOLING

HDD Adapter

DRILLNOVA HDD Adapters connect drill rigs, housings, drill strings and downhole tools with different thread interfaces. Available in pin-to-pin and box-to-pin configurations, each adapter is machined to the specified connection, through-bore and overall dimensions for dependable torque transfer and drilling-fluid circulation.

Application

HDD connection conversion

Connection Types

Pin-to-pin and box-to-pin

Common Threads

JT40, AT30, API REG and IF

Material Option

42CrMo alloy steel

Product Overview & Application

Overview

The DRILLNOVA HDD Adapter provides a controlled transition between incompatible drill-string or tooling connections. A one-piece alloy-steel body, precision-machined threads and a continuous internal bore support reliable mechanical load transfer and drilling-fluid flow in HDD pilot drilling and reaming assemblies.

DRILLNOVA HDD adapters in multiple sizes and connection configurations

Accurate Thread Conversion

Connect rig-side and tool-side interfaces without changing the complete drilling assembly.

One-Piece Alloy-Steel Body

The solid body provides a direct load path for rotation, thrust, pullback and bending loads.

Continuous Fluid Passage

The internal bore maintains drilling-fluid circulation through the connected tool string.

Project-Specific Configuration

Connection type, body dimensions, bore, shoulder geometry and overall length can be matched to the application.

Design, Construction & Available Options

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Body Construction

One-piece machined alloy-steel body

Documented Material

42CrMo alloy steel for the recorded JT40 adapter configurations

Connection Formats

Pin-to-pin, box-to-pin and project-specific crossover arrangements

Thread Options

JT40, AT30, API REG, API IF and other interfaces after drawing review

Internal Bore

Continuous drilling-fluid passage sized to the approved model drawing

Surface Protection

Protective finish and thread protectors selected for storage, transport and operating conditions

Do not select an adapter from thread diameter alone. Mismatched taper, pitch, shoulder position or gauge stand-off can damage both the adapter and mating component.

Models & Specifications

Review standard Diamond Compact PDC Bit configurations below. Final dimensions and connections are confirmed during application review.

DN-AD-JT40-287R

Rig-side connection: JT40 PIN
Tool-side connection: 2-7/8 in API REG PIN
Format: Pin-to-pin
Material: 42CrMo
Recorded inspection requirement: Overall length 10 mm; internal diameter 1 mm tolerance notation in QC record
Weight: By final drawing
VIEW PDF

Use, Quality & Documentation

Use & Installation

Confirm both mating threads, clean the connections and apply the approved make-up procedure before drilling.

Inspection / Replacement

Inspect threads, shoulders, body, bore, markings and protective finish before and after every run.

Handling / Storage

Install thread protectors and keep the adapter clean, dry and protected from impact and corrosion.

DRILLNOVA HDD adapter overall length inspection with precision caliper

Quality / Process Steps

1. Material and drawing verification
2. CNC body, bore and thread machining
3. Thread-gauge and dimensional inspection
4. Identification, protective finishing and packing

Documentation

Product Data SheetPDF ↓
Approved Model DrawingPDF ↓
Thread Inspection RecordPDF ↓
Handling & Make-Up GuidePDF ↓

Related HDD Products

Product FAQ

What is an HDD Adapter used for?

It connects two drill-string or tooling components that have different thread interfaces, sizes or pin/box arrangements.

What information is required to order an adapter?

Provide the exact connection on both ends, pin or box type, thread standard, nominal size, mating component details, bore, outside diameter, required overall length, rig model and operating loads.

What is the difference between pin-to-pin and box-to-pin?

A pin-to-pin adapter has external threaded connections at both ends. A box-to-pin adapter has one internal thread and one external thread.

Can DRILLNOVA manufacture custom connection combinations?

Yes. Mixed JT, AT, API REG, API IF and other connection combinations can be reviewed from drawings, thread samples or verified mating-component data.

Is 42CrMo used for every adapter?

The supplied QC record confirms 42CrMo for two JT40 adapter configurations. Material for other models should be confirmed on the approved drawing rather than assumed.

How is connection accuracy checked?

Inspection may include calibrated thread gauges, shoulder and stand-off checks, outside and internal diameter measurements, overall-length verification and visual examination.

Can an adapter be selected only by thread diameter?

No. Threads with similar diameters may have different pitch, taper, shoulder and gauge requirements. Both mating connections must be fully identified.

What should be checked after drilling?

Inspect for thread galling, shoulder damage, body deformation, washout or bore erosion, cracks, corrosion and illegible identification marks.

Confirm Your Adapter Connections

Send the rig-side and tool-side connection details, mating-component photos or drawings, bore requirement and required overall length. DRILLNOVA will review the interface and prepare the correct adapter configuration.

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Request Technical Guidance

Tell us about your ground conditions, bore requirements or tooling needs. Our HDD tool specialist will review your information and recommend the appropriate next step.

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  • Response from an HDD tooling specialist

For faster review, include the tool type, bore diameter, ground conditions, drill rig and required connection when available.

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