API Gauges
API 5B & 7-2 certified thread gauges for the oil and gas industry. DSN Enterprises is a licensed manufacturer of API gauges for casing, tubing, line pipe, and rotary shouldered connections.
API 5B License
License #5B-0039
Threading, gauging, and inspection of casing, tubing, and line pipe threads
API 7-2 License
License #7-2-0023
Threading and gauging of rotary shouldered thread connections
What are API Gauges?
API (American Petroleum Institute) gauges are specialized thread gauges designed for the oil and gas industry. They are used to inspect thread connections on casing, tubing, drill pipe, and other oilfield equipment to ensure safe and reliable connections under extreme downhole conditions.
DSN Enterprises is a licensed API manufacturer (API 5B-0039 and API 7-2-0023), producing certified gauges for petroleum industry applications. Our API gauges are manufactured to strict API specifications and undergo rigorous quality control to ensure compliance with industry standards.
API 5B Connections
API 7-2 Connections
Our API Gauge Products
Complete range of API certified gauges for oil and gas industry thread inspection and quality control.
API Thread Plug Gauge
API 5B & 7-2 Certified
Certified API thread plug gauges for inspection of internal threads on casing, tubing, line pipe, and rotary shouldered connections used in oil and gas drilling operations.
Key Features:
- API 5B certified for casing/tubing
- API 7-2 certified for rotary connections
- L1, L2, L3 configurations
API Thread Ring Gauge
API 5B & 7-2 Certified
Certified API thread ring gauges for inspection of external threads on pins, couplings, and rotary shouldered connections in petroleum industry applications.
Key Features:
- API specification compliant
- GO and NO-GO configurations
- L1, L2, L3 lengths
API Master Gauges
Reference Standards - API 5B & 7-2
High-precision master gauges used as reference standards for calibrating working API gauges. Essential for maintaining accuracy in quality control laboratories.
Key Features:
- Reference grade precision
- Calibration certificates
- Traceable to API standards
API Casing Thread Gauges
Sizes: 4-1/2" to 20" - API 5B
Complete range of API casing thread gauges for inspection of casing connections. Available in round thread (CSG), buttress (BCSG), and extreme line patterns.
Key Features:
- Round thread (8 TPI)
- Buttress thread (5 TPI)
- Extreme line available
API Tubing Thread Gauges
Sizes: 1.050" to 4-1/2" - API 5B
API tubing thread gauges for inspection of tubing connections used in oil well completion. Available in EUE (External Upset End) and NUE (Non-Upset End) configurations.
Key Features:
- EUE (External Upset End)
- NUE (Non-Upset End)
- 10 TPI thread form
API Rotary Shouldered Gauges
NC, IF, REG, FH - API 7-2
API 7-2 certified gauges for rotary shouldered thread connections used on drill pipe, drill collars, and bottom hole assemblies in drilling operations.
Key Features:
- NC numbered connections
- IF internal flush
- REG regular connections
API Standards & Specifications
API Specification 5B
Covers threading, gauging, and thread inspection of casing, tubing, and line pipe threads. Includes requirements for:
- • Round threads (8 TPI for casing, 10 TPI for tubing)
- • Buttress threads (5 TPI)
- • Line pipe threads (NPT)
- • Working and reference gauges
- • L1, L2, L3 gauge lengths
API Specification 7-2
Covers threading and gauging of rotary shouldered thread connections used on drill pipe and BHA. Includes:
- • NC (Numbered Connection) threads
- • IF (Internal Flush) connections
- • REG (Regular) connections
- • FH (Full Hole) connections
- • Standoff and pitch diameter gauges
Technical Specifications
| Material | OHNS (W) / Tungsten Carbide |
| Hardness | 60 ± 2 HRC |
| Treatment | Sub-Zero at -80°C |
| Thread Form | As per API 5B / 7-2 |
| Calibration | Traceable to API Standards |
| Certificate | API Certificate Included |
Industries Served:
- Oil & Gas Exploration
- Drilling Operations
- OCTG Manufacturing
- Pipe & Tube Mills
Need API Certified Gauges?
As an API licensed manufacturer, we provide certified gauges for the oil and gas industry. Contact us for specifications, pricing, and delivery information.