Alro logo Alro Steel was established in 1948 by Al and Robert Glick. Today, Alro is comprised of Alro Steel, Alro Metals, Alro Plastics and Alro Metals Outlet.

Processing Capabilities

Drilling and Tapping

Our FlexArm equipment allows Alro Plastics to offer in house capability of part tapping and Helicoil inserts. The FlexArm keeps the Helicoil insertion tool perpendicular to the work piece. The depth control ability offers consistency from part to part whether tapping or inserting helicoils.

A FlexArm Tapping Machine will take care of prep work such as reaming, chamfering and deburring. Eliminate setup time in the mill and reduce material handling. Save time and money by easily articulating a FlexArm tapping arm directly over the work piece.

Helicoil Size Offerings:

- Standard: 8-32, 10-24, ¼-20, 3/8-20, ½-13
- Metric: M3-0.5, M4-0.7, M5-0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5

Drills with special cut tips made for Plastics to help reduce cracking, crazing and stress from drilling. The flexibility of the FlexArm machine allows for drilling, tapping and the insertion of Helicoils. The FlexArm keeps the Helicoil insertion tool perpendicular to the work piece at all times.

Quantity Thickness Width Length Tolerance
1 piece
up to
10,000 piece
production runs
1/4” thick (min)
up to
4” thick (max)
1” wide (min)
up to
120” wide (max)
1” long (min)
up to
120” long (max)
Varies from job to
job and by material
* This chart is a guideline only. Tolerance listed is standard, Alro Plastics can quote alternate tolerances if needed.  Tolerances may vary depending upon material.