basic introduction

For metal castings, parts, fasteners, valves, springs and other products, ZRLK provides professional and accurate testing and analysis services. Based on the appearance dimensions, mechanical properties, life testing and other aspects of metal parts, according to various testing standards, ZRLK provides Authoritative third-party test report.

Testing service

Metal parts inspection

Spring testing, gear testing, bearing testing, etc.

Fastener testing

Bolts, screws, nuts, studs, screws, rivets, washers, retaining rings, welding nails, etc.

Metal casting inspection

Steel castings, cast irons, copper castings, aluminum castings, magnesium castings, zinc castings, titanium castings, etc.; grey iron castings, ductile iron castings, vermicular graphite iron castings, malleable iron castings, alloy iron castings, etc.; doors Handles, door locks, radiators, plumbing pipes, iron pans, gas stoves, irons, etc.

Valve inspection

High-pressure valve, vacuum valve, fire valve, plumbing valve, hydraulic valve, valve flange, copper valve, water valve, etc.

Spring detection

Gas spring, compression spring, spring washer, air spring, automobile spring, spring shock absorber, diaphragm spring, light weight spring, suspension eccentric spring, leaf spring, valve spring, floor spring, spring mattress, coil spring, stainless steel Springs, wave springs, torsion springs, safety valve springs, compression springs, butterfly springs, torque springs, carbon springs, rubber springs, alloy springs, etc.

Test items

Appearance size: thread pass and stop gauge, roughness, various length sizes.

Mechanical properties: (cloth, Luo, Wei) hardness, re-tempering test, (normal temperature, high temperature) tensile test, static load anchoring, guaranteed load, various effective moments, locking performance, torque coefficient, tightening axial force, Friction coefficient, anti-slip coefficient, screw-in test, gasket elasticity, toughness, hydrogen embrittlement test, flattening, flaring, flaring test, bending, (single side, double side) shear test, pendulum impact, pressure Test etc.

Life test: fatigue test, salt spray test, stress relaxation, high temperature creep, stress endurance test, etc.

Valve testing items: non-destructive testing, pressure testing, air tightness testing, tri-sex testing, anti-corrosion testing, factory testing, material testing, hardness, performance testing, magnetic particle testing, flow testing, etc.

Spring testing items: mechanical properties testing, pressure testing, stiffness testing, hardness testing, physical properties testing, fatigue testing, elastic testing, permanent deformation testing, damping testing, fracture failure analysis, corrosion resistance testing, load characteristics testing, tensile strength, Flaw detection, metallographic detection, steel wire detection, parallelism detection, perpendicularity detection, air tightness detection, etc.

Testing standards

GB/T 3098.2-2000 Mechanical properties of fasteners Nut coarse thread

GB/T 3098.3-2000 Fastening screws for mechanical properties of fasteners

GB/T 3098.4-2000 Mechanical properties of fasteners, fine thread of nuts

GB/T 3098.5-2000 Fastener mechanical performance self-tapping screw

GB/T 3098.6-2000 Mechanical properties of fasteners Stainless steel bolts, screws and studs

GB/T 3098.7-2000 Fastener mechanical properties self-extruded screws

GB/T 3098.14-2000 Fastener mechanical performance nut expansion test

GB/T 3098.15-2000 Mechanical properties of fasteners Stainless steel nuts

GB/T 3098.16-2000 Mechanical properties of fasteners Stainless steel set screws

GB/T 5779.1-2000 General requirements for bolts, screws and studs with surface defects on fasteners

GB/T 5779.2-2000 fastener surface defect nut

GB/T 5779.3-2000 Particular requirements for bolts, screws and studs with fastener surface defects

GB/T 2-2001 End of external thread parts of fasteners

GB/T 3098.11-2002 Mechanical properties of fasteners Self-drilling self-tapping screws

GB/T 3103.1-2002 Tolerances for fasteners bolts, screws, studs and nuts

Our advantage

1. With a professional qualification and experienced expert technical team, we can provide you with professional consultation and services.

2. Have advanced laboratory equipment to ensure the accuracy and reliability of test data.

3. As a third-party testing and certification organization trusted by customers worldwide, we are your certificate of quality.