Engineering Aids
were put together to give our customers and our in-house personnel quick access to some of the important information needed in designing and fabricating parts.  These list include charts accumulated from other sources and items tested in house using our tooling.

Some items may differ from other manufacturers, because of tooling capabilities and different installation methods.

Bend Deductions
A list of the bend deductions tested with our tooling.

Tap Sizes
Pre-drill sizes for standard and roll form tapping.

Pem Chart
Installation sizes for the most commonly used Pem hardware.

Drill Sizes
Chart for decimal equivalents of letter and number drills.

Material Gauges
Decimal thickness for gauges of steel, aluminum and stainless steel sheet metal.

Screw Details
Specification for 82 deg screws, including countersink sizes, clearances and other details.


 
Bend Deductions
Tap Sizes
Material Gauges
Pem Chart
Drill Sizes
Screw Details
   
   
Lehi Sheet Metal, Corp.
info@lehisheetmetal.com
245 Flanders Rd. Westboro, MA 01602 Phone (508) 366-8550 fax(508) 870-1714