Fastener Inspection

Applicable materials: Suitable for fastener specific metal materials such as carbon steel, alloy steel, stainless steel, titanium alloy, copper alloy, aluminum alloy, etc.

Applicable products: including bolts, nuts, screws, studs, washers, retaining rings, pins, rivets, tooth strips, anchor bolts, and other mechanical and structural fasteners.

Applicable scenarios: Used for raw material incoming inspection, finished product factory acceptance, assembly quality assessment, mechanical performance verification, non-destructive testing, installation quality inspection, failure analysis, and quality arbitration testing.

Chemical composition analysis: determination of the content of elements such as carbon, silicon, manganese, sulfur, phosphorus, chromium, nickel, molybdenum, boron, etc., and determination of the conformity of material grades and compositions.
Mechanical performance testing: tensile strength, yield strength, elongation at break, reduction in cross-sectional area, guaranteed load, wedge load test, hardness, impact toughness, decarburization layer depth, and re tempering hardness test.
Thread accuracy testing: thread gauge inspection, pitch, major diameter, minor diameter, pitch, profile, thread tolerance and conformity assessment.
Size and appearance inspection: Inspection of dimensions and positional tolerances such as total length, rod diameter, head thickness, opposite edge width, diagonal dimensions, perpendicularity, coaxiality, symmetry, etc.
Surface quality inspection: Inspection and evaluation of appearance defects such as surface cracks, folds, hairlines, scratches, pitting, burrs, rust, burns, etc.
Surface treatment testing: assessment of coating thickness, adhesion, corrosion resistance, and hydrogen embrittlement tendency for galvanizing, hot-dip galvanizing, Dacromet, phosphating, passivation, and other coatings.
Process performance testing: torsion test, bending test, hole expansion test, locking performance, assembly and fastening performance verification.
Non destructive testing: magnetic particle inspection, penetrant inspection, used for detecting defects such as surface and near surface cracks.
Failure analysis: Analysis of failure modes and causes such as fastener fracture, loosening, tooth slippage, corrosion, wear, fatigue, hydrogen embrittlement, etc.