Thread Check Catalog 2023

API (American Petroleum Institute) GAGES

FH- Full Hole Connections are Rotary Shoulder Connections having the V-040 or V-050 thread forms. Gauging practice and thread inspection should conform to the requirements of API Spec 7-2. Thread Check, Inc. offers the complete range of API FH - Full Hole Thread Plug and Ring Gages to API Spec 7-2.

FH - Full Hole - Rotary Shouldered Connection Thread Plug and Ring Gages API Spec 7-2 (Priced on Request) Description Order Number 2-7/8" FH (Full Hole) Thread Plug Gage FH-2-7/8-P 2-7/8" FH (Full Hole) Thread Ring Gage FH-2-7/8-R 3-1/2" FH (Full Hole) Thread Plug Gage FH-3-1/2-P 3-1/2" FH (Full Hole) Thread Ring Gage FH-3-1/2-R 4-1/2" FH (Full Hole) Thread Plug Gage FH-4-1/2-P 4-1/2" FH (Full Hole) Thread Ring Gage FH-4-1/2-R 4" FH (Full Hole) Thread Plug Gage FH-4-P 4" FH (Full Hole) Thread Ring Gage FH-4-R 5-1/2" FH (Full Hole) Thread Plug Gage FH-5-1/2-P 5-1/2" FH (Full Hole) Thread Ring Gage FH-5-1/2-R 6-5/8" FH (Full Hole) Thread Plug Gage FH-6-5/8-P 6-5/8" FH (Full Hole) Thread Ring Gage FH-6-5/8-R IF - Internal Flush - Rotary Shouldered Connection Thread Plug and Ring Gages API Spec 7-2 (Priced on Request) Description Order Number 2-3/8" IF ( Internal Flush ) Thread Plug Gage ( NC26 Thread Plug Gage interchangeable ) IF-2-3/8-P 2-3/8" IF ( Internal Flush ) Thread Ring Gage ( NC26 Thread Ring Gage interchangeable ) IF-2-3/8-R 2-7/8" IF ( Internal Flush ) Thread Plug Gage ( NC31 Thread Plug Gage interchangeable ) IF-2-7/8-P 2-7/8" IF ( Internal Flush ) Thread Ring Gage ( NC31 Thread Ring Gage interchangeable ) IF-2-7/8-R 3-1/2" IF ( Internal Flush ) Thread Plug Gage ( NC38 Thread Plug Gage interchangeable ) IF-3-1/2-P 3-1/2" IF ( Internal Flush ) Thread Ring Gage ( NC38 Thread Ring Gage interchangeable ) IF-3-1/2-R 4" IF ( Internal Flush ) Thread Plug Gage ( NC46 Thread Plug Gage interchangeable ) IF-4-P 4" IF ( Internal Flush ) Thread Ring Gage ( NC46 Thread Ring Gage interchangeable ) IF-4-R 4-1/2" IF ( Internal Flush ) Thread Plug Gage ( NC50 Thread Plug Gage interchangeable ) IF-4-1/2-P 4-1/2" IF ( Internal Flush ) Thread Ring Gage ( NC50 Thread Ring Gage interchangeable ) IF-4-1/2-R 5-1/2" IF ( Internal Flush ) Thread Plug Gage IF-5-1/2-P 5-1/2" IF ( Internal Flush ) Thread Ring Gage IF-5-1/2-R 6-5/8" IF ( Internal Flush ) Thread Plug Gage IF-6-5/8-P 6-5/8" IF ( Internal Flush ) Thread Ring Gage IF-6-5/8-R

IF- Internal Flush Connections are Rotary Shoulder Connections having the V-038R thread forms. Gauging practice and thread

inspection should conform to the requirements of API Spec 7-2.

Thread Check, Inc. offers the complete range of API IF - Internal Flush Thread Plug and Ring Gages to API Spec 7-2.

Per API Spec 7 - Obsolescence Rotary Shouldered Connections

All API IF and FH connections are now considered obsolescent and appear in the appendixes I,J, and K of API specification 7. Of the new NC connections there are 5 sizes that have the same pitch diameter, taper, pitch, and length of thread as the corresponding size in the IF style and one corresponds to the 4 FH connection. These 6 connections in the number style can be gauged with the same gauging practice and same gauges required for the equivalent connections.

In 1964, at the API Committee on Drilling and Service Equipment, a new series of rotary shouldered connections was adopted in order to improve the service performance of drill collars and tool joints. 11 of the 13 NC sizes were approved as standard. For the new style of connections, the size designation is a two digit number indicating the pitch diameter of the pin member at the gage point and the style is referred to as the number style or numbered connection – NC. These NC connections utilize a V thread form having a .065 inch flat crest and a .038 inch rounded root. This form is specified as the V-0.038R form. This V .038R form mates with the V-0.065 form that is employed on all API internal flush (IF) connections and on the API 4 inch full hole ( FH) connection.

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