1. All steel pipe scaffolding couplers should be free from visible cracks, and major components should be free from defects such as shrinkage cavities, slag inclusions, air holes, overheating, material shortages, and folds.
2. The opening distance between the cover plate and the seat should not be less than the diameter of the steel pipe.
3. The number of sand holes larger than 10mm² on the surface of the steel pipe scaffolding coupler should not exceed three, and the cumulative area should not exceed 50mm².
4. The cumulative area of sand adhering to the surface of the steel pipe scaffolding coupler should not exceed 150mm².
5. The relative positional offset of the parting surface of the cast steel pipe scaffolding coupler should not exceed 1mm.
6. Surface convexity of the steel pipe scaffolding coupler should be within acceptable limits. 7. The height (or depth) of the concave area should not exceed 1mm;
8. There should be no oxide scale at the contact points between the steel pipe scaffolding coupler and the steel pipe, and the cumulative area of oxide scale on other parts should not exceed 150mm²;
9. The riveted joints of the steel pipe scaffolding coupler should be firm and free of cracks.
10. The moving parts of the steel pipe scaffolding coupler should rotate freely, and the gap between the two rotating surfaces of the swivel coupler should be less than 1mm.
11. The model, trademark, and production year of the cast steel pipe scaffolding coupler should be cast in a prominent place, and the lettering and patterns should be clear and complete.
12. Asphalt paint should not be used for surface anti-corrosion treatment of steel pipe scaffolding couplers, and the treated surface should not have paint buildup or exposed iron.
Post time: Apr-07-2026