American National Basic Thread Form
For checking thread angles, root and crest-forms and depth, from 4 to 80 pitch thread, as defined in the Federal Standard Handbook H-28. The standard magnification for this chart is 20X.
Please select the applicable requirements listed above to ensure all chart options have been identified prior to purchase. Feel free to email us or call us at 216-347-9126 with any questions you have regarding the purchase of this product.
Chart Material Options:
Protected Image Glass Charts (Standard)
These glass charts are of the protected image type; a thin sheet of plastic is laminated to the image surface. The image is incapsulated and will not wash off with continuous cleaning. This protected image usually extends the life of the charts considerably.
Plastic Overlay Charts
The plastic overlay chart is recommended when charts are being changed frequently. The plastic selected for use in producing charts and scales was made for its optical qualities and dimensional stability. All plastic charts and scales are image etched into the surface for permanence; the image is etched to a depth of approximately .002 without affecting the accuracy or quality. Plastic charts are available with either a clear or frosted finish.
Mylar Overlay Charts
The mylar overlay charts are .007" thick and can be rolled for storage. They are not as durable as either glass or plastic charts. Mylar charts are available with either a clear or frosted finish.
All glass and plastic charts and scales may be cleaned with isopropol alcohol to dissolve and remove oil, grease and dirt without discoloring or affecting the optical focal plane surface of the charts and scales. Soap and water may also be used with fair results when there is no oil or grease. Always be sure to use a soft cotton cloth when cleaning.
It is recommended to store our products in the polyethylene bag in which it was shipped. Store the charts and scales where the temperatures will not exceed 90 degrees F. With proper care in cleaning and storing as recommended above, our products should last indefinitely.
Avoid the use of colored window cleaners, acetone, lacquer thinners, etc., as they will affect the chart surface.
Avoid the use of paper cleaning products as they may scratch or mar the chart surface.
Certifications of Accuracy
The General Certificate of Conformance is provided with each product manufactured and shipped by Visual Precision. There is no serial number assigned to the product. There is no charge for this certificate.
Certificate of Accuracy
The Certificate of Accuracy is provided upon request. A serial number is assigned and is placed on the certificate and the product. The product is inspected visually and its accuracy is within the value stated on the certificate.
Certificate of Accuracy - Long Form
The Certificate of Accuracy - Long Form is provided upon request. A serial number is assigned and is placed on the certificate and the product. The product is inspected and a report is provided listing all the pertinent actual dimensions compared to the marked dimensions on the product or engineering drawing. The charge for this service is based on the chart or scale to be inspected.
Accuracy of Charts and Scales
Certificate of Accuracy - Long Form with Third Party Inspection
The Certificate of Accuracy - Long Form with Third Pary Inspection Report is provided upon request. A serial number is assigned and is placed on the certificate and the product. The product is inspected and a report is provided listing all the pertinent actual dimensions compared to the marked dimensions on the product or engineering drawing. In addition, a third party inspection report is provided. This certificate and accompanying report follows the guidelines provided by ISO 9000. The charge for this service is based on the chart or scale to be inspected.
The master charts were scribed with precision coordinatographs under controlled conditions. The readouts were made from scales traceable to the National Institute of Standards and Technology, Test No. 232-12/212279 Ident. No. L-9434 and Test No. V007-T-011-78-10 Ident. No. 7517.