Precision Machining SolutionsNational Technologies, Inc.

Single Spindle Screw Machining of a Steel Plug for Engine Manufacturing

Steel Plug
Steel Plug

National Technologies was commissioned by a customer in the engine manufacturing industry to complete the screw machining of the steel plug highlighted below, for use in an engine assembly. Our advanced single spindle screw machining process was carried out on 12L14 steel utilizing a Brown & Sharpe Ultramatic screw machine. The fine detailing was performed with threading and drilling processes. Deburring was employed for the thorough cleaning of the part, and the unit was finished with a non metallic, corrosion resistant Parco Lubrite 5 manganese phosphate conversion coating. Dimensional and visual inspections were executed to ensure integrity and quality.

The tightest tolerance of ± 0.010” and an angular tolerance of ± 1° were met during fabrication. Overall measurements of the plug were a length of 0.531”, an outside diameter of 0.875”, and a hex dimension of 0.861”/0.880”. After a turnaround time of 2 weeks, 526 plugs were constructed and shipped to the customer as specified. For over 50 years, National Technologies has been providing high volume custom CNC machined and screw machined parts, with an emphasis on customer service. For more about this screw machined plug project or any of our extensive machining capabilities please see the table below or contact us directly.

Single Spindle Screw Machining Project Highlights

Product Name
Product Description
This plug is used in an engine component.
Capabilities Applied/Processes
Single Spindle Screw Machining

Conversion Coating
Equipment Used to Manufacture Part
Brown & Sharpe Ultramatic
Overall Part Dimensions
OD: Ø 0.875" ± 0.010
Length: 0.531" ± 0.010
Hex: 0.861" / 0.880"
Tightest Tolerances
± 0.010"
Angular: ± 1°
Material Used
12L14 Steel
Material Finish
Parco Lubrite 5 Manganese Phosphate Conversion Coated
In Process Testing/Inspection Performed
Dimensional Inspection
Visual Inspection
Industry for Use
Engine Manufacturing
Delivery/Turnaround Time
2 Weeks
Delivery Location
United States
Standards Met
Customer Specifications, 2D CAD Drawing
(SP 9940-503)
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