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Standard Quality Requirements

Standard Quality Requirements

Last updated on January 19, 2025

Quality Standard Requirements for Every Placed Order

This document outlines the quality standards required for all orders placed by Jiga. Adherence to these standards ensures that parts meet functional and customer expectations. If a customer's drawings or external remarks specify quality standards superior to those outlined here, the superior standards will be considered the required quality benchmarks.

A .Measurement Reports

The standard inspection measurement report should includes the following parameters to ensure dimensional and functional accuracy:

  1. Critical Dimensions
      • Dimensions directly affecting the function or fit of the part (e.g., bore diameters, mating surfaces, thread sizes).
  1. Tolerance-Critical Features
      • Features with tight tolerances requiring precise measurements.
  1. Geometric Dimensioning and Tolerancing (GD&T)
      • Inspection of critical geometric characteristics such as flatness, roundness, or perpendicularity.
  1. Functional Features
      • Elements directly influencing usability, such as slots, grooves, or holes required for assembly.
  1. Inspection Data
      • Results provided for selected dimensions based on customer or internal quality control requirements.

The measurement report should contain customer drawing with clear balloon indication of the measured parameter. The marked parameters should be listed in a table with the indication of the parameter, the requirement, Minimum and Maximum allowed deviation ,actual measurement, and Pass/Fail summary.

B. Sampling Inspection Size

Please adhere to AQL 2.5 General Inspection Level II for sampling inspections. This ensures a statistically valid assessment of quality. Below is the AQL 2.5 table for reference:

Lot Size
Sample Size (General Inspection Level II)
Acceptance Number (Ac)
Rejection Number (Re)
2 - 8
2
0
1
9 - 15
2
0
1
16 - 25
3
0
1
26 - 50
5
0
1
51 - 90
8
1
2
91 - 150
13
1
2
151 - 280
20
2
3
281 - 500
32
3
4
501 - 1,200
50
5
6
1,201 - 3,200
80
7
8
3,201 - 10,000
125
10
11
 

C. Cosmetic acceptance

1. Surface Finish

  • Machined Surfaces:
    • Visible tool marks should be consistent and not excessive.
    • Surface roughness should meet the specified Ra value on the drawing (e.g., Ra 1.6 µm or better for critical areas).
  • Polished or Finished Surfaces:
    • Free of scratches, gouges, or polishing marks that exceed acceptable limits specified on the drawing.
    • Uniformity in appearance, free of visible patches or dull spots.

2. Scratches, Dents, and Nicks

  • No visible scratches, dents, or nicks are allowed unless they fall within the acceptable range defined by the customer.
  • Surface defects should not compromise fit, form, or function.
  • Minor handling marks are permissible if they do not exceed a certain depth (e.g., less than 0.1 mm or as specified).

3. Color and Coating Uniformity

  • Anodized/Plated Parts:
    • Uniform coating thickness and color across the entire surface.
    • No blotches, discoloration, or uneven finishes.
  • Painted/Coated Parts:
    • No runs, sags, or bubbles in the coating.
    • Coating must adhere firmly without peeling or flaking.
    • Color must match the specified Pantone, RAL, or sample standard.

4. Edges and Corners

  • All edges and corners should be deburred to eliminate sharpness unless otherwise specified (e.g., sharp edges required for functional purposes).
  • Chamfers or radii must match the dimensions on the drawing.

5. Parting Lines and Seams

  • Any parting lines, if present, should be minimized and consistent.
  • No excessive mismatch or material flashing is acceptable.

6. Cleanliness

  • Parts must be free of oil, grease, chips, or residue from machining or cleaning processes.
  • No fingerprints, smudges, or other contamination should be visible.

7. Branding or Marking

  • Engravings, part numbers, logos, or other markings must be clean, legible, and located as specified in the drawing.
  • No excessive burrs or deformation around marked areas.

8. Dimensions Affecting Cosmetics

  • Features affecting the visual appearance, such as countersinks or flanges, must be smooth and free of irregularities.
  • No steps, irregular tool marks, or deviations from design geometry are acceptable in visible areas.

9. Welded Areas (if applicable)

  • Welds should be smooth and uniform with no visible cracks, pits, or porosity.
  • Grinding or blending of welds should ensure a consistent surface appearance.
 
 

D. Certifications

Please provide the following certifications to ensure material and process compliance:

  1. Material Test Reports
      • Standard material certificate provided by the material supplier.
      • In the absence of a material supplier certificate, a signed chemical composition report from a certified laboratory will be required.
  1. Coating/Plating or Finish Certification
      • Certification confirming compliance with the standard or requirement specified in the drawings. the report must contain the item part number and quantity.
  1. Welding Certification
      • Certification per the required standard, as mentioned in the drawing.
  1. Heat treatment certification
      • must confirm compliance with the required standards outlined in the drawings to present sample size, result vs time graph and final HRC.