Direct Answer
A piece mark drawing shows one fabricated member in full detail: its piece mark identifier, overall length, section size, bolt hole pattern, cope dimensions, weld callouts, and any attached plates. Start by confirming the piece mark matches your work order, then verify the overall length, then check each end connection detail before moving to mid-member features.
Full Explanation
Piece mark drawings typically show two or three views: a front elevation showing the full member length and end connections, a plan view showing the top flange and any top-of-steel attachments, and section cuts through connections. Dimensions run from work-point to work-point or from the face of the end connection plate. Weld symbols follow AWS A2.4 — the arrow side of the reference line is the 'near' side of the joint. Bolt callouts specify diameter, grade, and spacing in both directions.
What This Means for Your Shop
Train your layout people to always check: (1) piece mark, (2) section size vs. order confirmation, (3) overall length, (4) hole pattern at each end. These five checks, done before cutting, catch 90% of fabrication errors.
Common Mistakes
Reading the wrong view for a dimension — taking a length from the plan view when it should come from the elevation. Also: misreading a cope depth because the drawing used a different datum than expected.
Recommended Process
Develop a shop floor checklist for each piece mark drawing: confirm piece mark, section, length, holes, welds, and finish. Sign and date the checklist before the first cut. Retain checklists as QC documentation.