Import Api Master Thread Gauge — Buy in wholesale FOB from Supplier in China

API Master Thread Gauges from Dongying Lake Petroleum Technology Co., Ltd are precision inspection instruments used to verify API internal and external thread conformity on oilfield tubular goods. The gauges cover multiple thread families including CSG, LCSG, LP, BCSG, TBG and UPTBG under API Spec 5B, plus NC, REG, FH and IF thread forms under API Spec 7-2. The Spec 5B range spans CSG and LCSG from 4-1/2 inches to 20 inches, LP from 1/8 inch to 12 inches, BCSG from 4-1/2 inches to 6 inches, and TBG and UPTBG from 1.050 inches to 4-1/2 inches. The Spec 7-2 range covers NC10 through NC77, REG 2-3/8 inches to 8-5/8 inches, FH 3-1/2 inches to 6-5/8 inches, and IF 2-3/8 inches to 5-1/2 inches.

These gauges are manufactured from hardened tool steel with precision-ground thread flanks to maintain tight tolerance control across the specified dimensional ranges. The working surface finish and thread form accuracy are critical to reliable gaging of casing, tubing and drill string connections in high-pressure well environments. Thread pitch diameter, lead angle and flank angle must all fall within API-mandated limits for the gauge to certify that production threads are within specification. Proper handling and storage in protective cases prevents damage to the master surfaces that would compromise measurement integrity.

Oilfield equipment distributors, drilling contractors and pipe inspection services purchase these gauges to support incoming quality control and field verification programs. Buyers should confirm with Dongying Lake Petroleum Technology Co., Ltd whether gauges are supplied as working masters or reference standards, as this determines calibration frequency and traceability documentation. Each gauge requires a calibration certificate with measurement uncertainty data, typically traceable to national length standards. The supplier's location in Dongying, Shandong Province places it within China's principal petroleum equipment manufacturing cluster, though buyers should verify response capability given the zero percent response rate currently shown.

Dongying Lake Petroleum Technology Co., Ltd is located on Huanghe Road in Dongying, Shandong Province, with postal code 257000. The company operates as an imported supplier tier within the marketplace, holding a harbor trust classification. The supplier profile shows a zero percent response rate with no recorded average response hours, which indicates limited or no engagement through the platform's inquiry system. The address places the company in Dongying, a city recognised for its concentration of oilfield equipment manufacturers serving Sinopec and export markets.

The listing provides no information about the company's founding year, employee count, annual revenue, factory size, or specific client base. No certifications such as ISO 9001 or API Q1 are stated in the available data. Buyers should conduct independent due diligence on the company's manufacturing capability, quality management system and export experience before placing orders. The product description suggests specialisation in API thread inspection equipment, but the breadth of the company's catalogue beyond gauges is not disclosed.