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Fastener options: PEMs, rivet nuts, welding studs
Selecting the right fastener is critical for thin sheet metal assemblies. This article compares PEMs, rivet nuts, and welding studs, explaining when to use each based on thickness, load, access, and manufacturability, with real DFM guidance from Rollyu Precision.
Jan. 30, 2026
Countersinks
Countersinking in thin sheet metal requires precise control of angle, depth, and location to avoid deformation and fit issues. This article explains manufacturable tolerances, production methods, and DFM practices used by Rollyu Precision to achieve flush fasteners and stable assemblies in critical industries.
Jan. 29, 2026
Tolerance recommendations
Tolerance control in sheet metal fabrication requires balancing functional needs with real manufacturing behavior. This article outlines practical tolerance ranges, DFM spacing rules, and industry-specific considerations to help reduce scrap, control cost, and achieve stable, repeatable production.
Jan. 28, 2026
Tab-and-slot design tips
Tab-and-slot design is a proven DFM strategy in sheet metal fabrication that improves assembly alignment, reduces tolerance stack-up, and minimizes the need for fixtures.
Jan. 27, 2026
Hole-to-edge and hole-to-bend distance
Proper hole placement is a critical DFM factor in sheet metal fabrication. Holes placed too close to bends or edges can distort, crack, or shift during forming, causing assembly and cosmetic issues. This article outlines practical hole-to-bend and hole-to-edge guidelines and shows how early DFM adjustments improve yield and production stability.
Jan. 26, 2026