Import Api Woring Gauge — Buy in Bulk from Supplier in China

The API Woring Gauge from Baoji Thread Gages Co., Ltd. is a precision thread-measurement instrument used to verify the dimensional conformity of API-standard threaded connections in oilfield tubular and tool joints. Manufactured in Baoji, Shaanxi Province, this gauge carries the supplier's stated API SPEC 7-2 and API SPEC 5B certifications, covering rotary shouldered connections and casing/tubing thread inspection respectively. The product is intended for go/no-go functional gauging of thread form, pitch diameter, and thread lead on components such as drill pipe tool joints, casing couplings, and tubing connections. As a working gauge, it is subject to routine wear and requires periodic calibration against master reference standards, distinguishing it from master or reference gauges used in laboratory settings.

These gauges are typically manufactured from high-alloy tool steel, most commonly O1 or A2 grade, with selective hardening to 58-64 HRC on thread contact surfaces to resist abrasion. The thread form is precision ground and lapped to API thread profiles, with flank angles of 60 degrees for V-threads or as specified for buttress and round thread forms. Lead tolerance is typically held to 0.025 mm per 25 mm of thread length, and pitch diameter measurement uncertainty must fall within API-specified working gauge limits, typically 0.013 mm wider than master gauge tolerances to account for measurement repeatability and gauge wear allowance. Surface finish on thread flanks is typically 0.4-0.8 Ra micrometres to ensure consistent engagement without galling during inspection.

Primary users include oilfield tubular inspection companies, drilling contractor maintenance facilities, and OEM pipe manufacturers requiring in-process or final inspection of threaded connections. The gauge is employed on drill pipe, casing, tubing, and line pipe where API thread standards apply. Buyers should confirm the specific thread specification required, API thread designation, and whether the gauge is supplied as a go member, no-go member, or paired set. Calibration interval, traceability to national standards, and wear-limit documentation are critical procurement considerations not fully detailed in the available source material.

Baoji Thread Gages Co., Ltd. was established in September 2007 with a registered capital of 1,000,000 USD and total stated investment of 5,000,000 USD, located at No.88 Baoguang Road, Baoji, Shaanxi Province, postal code 721006. The company holds API SPEC 7-2 (certificate 0680) and API SPEC 5B (certificate 0032) through the American Petroleum Institute, and ISO 9001:2008 certification (UQ090985R0) for quality management. The source describes it as a technology-based manufacturing enterprise focused on API thread gauges and special thread gauges, with integrated production and sales operations. The response rate is recorded at 0.00 percent, indicating no platform-mediated communication history.

The supplier positions itself as one of few domestic Chinese manufacturers holding API certification for petroleum thread gauges. The available profile does not disclose current workforce size, annual production capacity, revenue figures, or named clients, and these should not be invented. The company's location in Baoji places it within a recognised Chinese centre for precision tooling and petroleum equipment manufacturing. Buyers should independently verify the currency of API certificates through the API composite index, and confirm whether ISO 9001:2008 certification has been updated to the current ISO 9001:2015 standard, as the stated certificate references the superseded version.