MRP-1000 Series Crest Diameter and Ovality Gages - 1" - 4-1/2" Tubing

Thirty years ago, Gagemaker introduced the MRP® crest diameter and ovality gage which forever changed the industry. Today, the MRP® series of gages is the industry standard worldwide. Whether you call it Crest Diameter, Root Diameter, or Ball PD, Pitch Diameter governs the strength of the actual thread assembly and ensures API dimensional measurement specs are met. (Check out the new carbon fiber MRP AIR.)

MRP-1000 Series Crest Diameter and Ovality Gages - 1" - 4-1/2" Tubing

The Gagemaker MRP® crest diameter gages measure the internal and external pitch diameters of tapered threaded connections. Any slight variations in diameter or ovality are immediately detected with these precision gages allowing the operator total control over the quality in the threads they are producing . MRP® crest diameter gages are extremely versatile with 3 models that can can easily adjust to measure thread diameters ranging from 1½” – 20”. The ability to inspect and measure a range of internal and external diameters with one gage, eliminates the need for heavy, cumbersome, and expensive fixed limit ring or plug gages.

The gage uses two pivoting shoes that rest on the crests of the threads during inspection. Any variations in pitch diameter
detected during inspection are shown on the gage’s indicator.

Gagemaker offers both rod style setting standard and frame style setting standards which can be used to preset the MRP® Crest Diameter Gage.

Please be advised the MRP-1000 model number was updated / superseded by an improved version of the gage.

The model numbers for the MRP-1000 series now follow the same naming convention as the MRP-2000 series.  MRP-1001 is configured for external measurement, the MRP-1002 is configured for internal measurement, and the MRP-1003 is configured for both internal & external measurement.

In addition, a lifting lever has been added to the pivot arm. The diameter of the upper and lower arms has both increased from 0.375” to 0.500” for improved resistance to deflection and to enable more travel.  We also upgraded the indicator from an AGD 1 (1” diameter dial) to a standard AGD 2 (2” diameter dial).

Legacy MRP-1000 series upper arms, lower arms, and blocks with a 0.375” hole are no longer available through Gagemaker.  If you require replacement arms for a legacy MRP-1000 gage, you can purchase new 0.500” arms and new blocks with 0.500” holes to accommodate them.  Legacy upper, lower arms and blocks with 0.375” can only be procured by contacting Thread Check Inc.

Thread Check has a team of technical experts that are ready to help you with all your gauging and measurement requirements. Contact us via email at or call us at 800 767 7633

SKU Description External Range Internal Range Reach Each
MRP-1012-TST Gagemaker - Internal/External Pitch Diameter Gage, Two Step Thread, w/ 1.030" Horseshoe standoff for front and rear measurements. Arms have .740" diameter. Upper arm has extended travel of .350" 1 3/4" - 4 1/2"2 3/8" - 4 1/2"4.4"
MRP-1012-TSS Gagemaker - Internal/External Pitch Diameter Gage for Two Step Seal. Upper and lower arms are .740" diameter. Upper arm has standard travel of .150". Shipped with T125 pts. 1 3/4" - 4 1/2"2 3/8" - 4 1/2"4.4"
MRP-202 Gagemaker - Internal Small Crest/Pitch Diameter gage N/A1 - 2 1/2"N/A
MRP-1002 Gagemaker - Internal Crest Diameter Gage, 4.4" N/A1 1/2" - 4 1/2"4.4"
MRP-1003 Gagemaker - External/Internal Crest Diameter Gage, 4.4" Reach, External Range 1 1/2" - 4 1/2", Internal Range 1 1/2" - 4 1/2" 1 1/2" - 4 1/2"1 1/2" - 4 1/2"4.4"
MRP-1001 Gagemaker - External Crest Diameter Gage, 4.4" Reach- 11/2" - 4-1/2" diameter range 1 - 2 1/2"N/A4.4"
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