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Quality

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  • Quality Test Joint Tensile Strength Test

    We are equipped with a professional digital tensile testing machine (with valid metrological calibration certification issued by accredited professional third-party institutions), and have implemented a fully standardized tensile testing procedure: Secure the brush connector in the tester's clamping slot and lock it firmly, then apply tensile load at a constant speed until reaching the standard load specified for the corresponding product specification.

  • Quality Test Barrel Tensile Special Inspection

    Actual testing is conducted with a professional pointer-type push-pull force gauge: Clamp the gun barrel securely to the bench vise workbench, attach the brush to the cleaning rod, then pull the cleaning rod handle at a constant speed in parallel alignment to apply tensile load to the brush head.

  • Quality Test Thread Go/No-Go Gauge Inspection

    Standard thread go/no-go gauges are used for batch-by-batch verification, covering both American standard (UNC/UNF) threads and Chinese GB standard threads. All finished products meet thread tolerance requirements: the go gauge screws in smoothly without resistance, while the no-go gauge is effectively stopped within the allowable limit. All inspection records are fully documented and archived for traceability, with a consistently stable batch qualification rate.

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  • Mandatory Joint Tensile Testing

    Backed by 26 years of brush manufacturing expertise and a mature quality control system at Jinhua Tongshun Tools Factory, connector tensile testing is a non-negotiable basic inspection item that every batch of brass wire brushes and cotton yarn brushes must pass prior to factory release. This tensile strength standard is also incorporated as a binding clause in all OEM/ODM cooperation contracts, ensuring we stably deliver high-quality gun cleaning brushes with zero ferrule detachment for private label clients worldwide.

  • On-Barrel Bristle Retention Test

    For all finished products across our full range — including cotton yarn brushes and phosphor bronze wire brushes — on-barrel tensile testing is a mandatory procedure that must be completed prior to factory release. This testing standard is written as a binding clause for all brush orders, with no exceptions for OEM/ODM private label projects. The test is designed to verify that 99% of the bristle bearing area is evenly and effectively loaded, eliminating common after-sales issues at the source: bristle shedding and aluminum ferrule detachment during cleaning use.

  • Precision Thread Go/No-Go Inspection

    We implement a 10% per-batch sampling inspection protocol for the connector threads of all our gun brushes (including cotton yarn brushes and brass wire brushes). Standard thread go/no-go gauges are used for batch-by-batch verification, covering both American standard (UNC/UNF) threads and Chinese GB standard threads.
  • Jinhua Tongshun Tool Factory
    Jinhua Tongshun Tool Factory

    In-Production Quality Control

    We track every order from raw material to packaging, with 100% pre-shipment inspection covering three mandatory QC tests, packed to international export standards for safe delivery.
  • Jinhua Tongshun Tool Factory
    Jinhua Tongshun Tool Factory

    After-Sales Support

    We provide lifetime technical consultation, stable long-term accessory supply, and flexible reorder lead times to keep your inventory running smoothly.
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