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Die Cast Surface Finishing Specifications
To be used in consultation with your die caster (Use in combination with Checklist C-8-1)*

Checklist for Finished Die Cast Part Purchasing

This Finishing Checklist provides a convenient method for assuring important factors involved in the surface finishing of die cast parts are evaluated and clearly communicated between the purchaser and the die caster.

It should be used as a supplement to the essential dimensional and alloy specifications detailed on part prints submitted for quotation, since the listed factors directly affect the basis on which the die casting quotation is made. The checklist may be reproduced for this purpose. Your die caster will clarify any item requiring further explanation.

This checklist provides a numbering system in which the lowest numbered description for each requirement can be met at the lowest production cost, as follows:

No.	Cost Effect
1	Most economical basis for production
2	Involves additional work which may affect cost
3-4	Additional work and special requirements which increase cost
5	Most difficult surface to die cast on a production basis

L.	Parting Lines	1. Polishing not required
		2. Polish only where marked on drawing
		3. Clean, dry and free of chips

M.	Surface Preparation	1. No buffing required
		2. Mechanical (burnishing, tumbling, etc.)
		3. Highest Quality - for electroplating, decorative finishing, O-ring seats

N.	Plating, Anodizing, or Other Special Finish	1. No die trimming - break off gate and overflows
		2. Die trimmed to within 0.010 in. (0.25 mm) of die casting surface
		3. Hand filed or polished - flush with die casting's surface

O.	Painting	1. Flash not removed
		2. Flash trimmed to within 0.010 in. (0.25 mm) of die casting surface
		3. Flash to be machined

P.	Environmental Exposure	1. Not removed (See NADCA Guideline G-6-5)
		2. Crushed or flattened (See NADCA Guideline G-6-5)
		3. Removed from specific locations

Q.	As-Cast Surface See NADCA Guideline G-6-6	1. No requirement
		2. Pressure-tight to agreed-upon psi (kPa). Testing medium:
		3. Other arrangements to be agreed upon

R.	Special Requirements	1. No requirements
		2. To NADCA "Standard" specification tolerances (S-4-5)
		3. Critical requirement - to NADCA "Precision" specification tolerances (P-4-5)

*The specification provisions and procedures listed in Section 7, "Quality Assurance," subsections 3, 4 and 5, should also be addressed. Publisher grants permission to reproduce this checklist as part of a part of a die casting Request for Quotation or Reproduction Specification.

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