Leather Goods Quality Control & Workshop SOP

What a good one includes

• A leather grading checklist that defines acceptable surface scars, stretch directions, and thickness tolerances for different parts of a pattern.
• Detailed skiving and splitting specifications, including exact millimeter targets for edges, pockets, and fold-overs.
• Stitching parameters that specify stitches-per-inch (SPI), thread weight, needle sizes, and tension settings for both hand-sewing and machine work.
• A step-by-step edge finishing protocol detailing the exact sanding grits, burnishing techniques, and edge paint application cycles required for a glassy finish.
• Adhesive guidelines outlining proper glue application, open time before bonding, and alignment verification methods before permanently joining parts.
• A final quality control checklist covering hardware alignment, stitch symmetry, thread clipping, and cleaning of silver pen marks.

Common mistakes to avoid

• Relying on vague terms like "stitch neatly" instead of defining exact stitch-per-inch measurements and thread tension limits.
• Failing to include visual reference photos of acceptable and unacceptable defects, which leaves too much room for subjective interpretation by makers.
• Omitting environmental controls for adhesive application, which leads to unpredictable bonding in humid or cold workshop conditions.
• Neglecting to document regular sewing machine and leather splitter maintenance schedules, resulting in skipped stitches or ruined hides mid-production.

Frequently asked questions