Specification 7-2 specifies requirements on rotary shouldered connections for use in petroleum and natural gas industries, including dimensional requirements on threads and thread gauges, stipulations on gauging practice, gauge specifications, as well as instruments and methods for inspection of thread connections. These connections are intended primarily for use in drill-string components.

Other supplementary specifications can be agreed between interested parties for special tolerance requirements, qualification, testing, inspection and finishing.

Specification 7-2 is applicable to the following preferred rotary shouldered connection designs:

• number (NC) style;
• regular (REG) style;
• full hole (FH) style.

These are traceable to an internationally supported system of gauges and calibration.

This edition of API Spec 7-2 is the identical (with a few editorial changes) national adoption of ISO 10424-2, Petroleum and natural gas industries-Rotary drilling equipment-Part 2: Threading and gauging of rotary shouldered thread connections. Spec 7-2 replaces threading and gauging previously covered by API Spec 7. This specification contains the API Monogram Annex as part of the U.S. national adoption.

Contents

API Foreword

Foreword

Introduction

1 Scope

2 Conformance — Units of measurement

3 Normative references

4 Terms, abbreviated terms, definitions and symbols

4.1 Terms and definitions

4.2 Design types and definitions

4.3 Abbreviations and symbols

5 Information to be supplied by purchaser

6 Threading

6.1 Thread profile and dimensions

6.2 Bevels for drill collars and tools that mate directly with drill collars

6.3 Low-torque feature

7 Product optional features

7.1 General

7.2 Stress-relief features

7.3 Benchmarks

7.4 Surface treatment

7.5 Cold working

7.6 Break-in

8 Product gauging

8.1 Gauging

8.2 Stand-off measurement

8.3 Gauge contact points

8.4 Lead measurement

8.5 Taper measurement

8.6 Thread height measurement and gauges

9 Gauge relationships for rotary shouldered connections

9.1 Gauge relationship

9.2 Gauge specifications

10 Gauge calibration

10.1 Calibration system

10.2 Acceptance criteria

10.3 Gauge measurement methods

10.4 Gauge certification

Annex A (informative) Tables in USC units

Annex B (informative) Care and use of regional master gauges

Annex C (normative) Shipment of reference master gauges

Annex D (normative) Care and use of working gauges

Annex E (informative) API gauge certification requirements

Annex F (informative) Other rotary shouldered connections

Annex G (informative) USC units conversion table

Annex H (informative) Recommended practice for gauging new rotary shouldered connections

Annex I (informative) Calculations

Annex J (informative) API grand and regional master rotary connection gauges

Annex K (informative) API Monogram

Annex L (normative) Regional Adoption Editorial Corrections