Precision Twist Drill 1010028 Plug Tap 5/16-18

Product Description

The PRECISION TWIST DRILL 1010028 is a 1500 Series plug tap designed for cutting internal threads in a wide range of materials. This hand tap features a 5/16-18 UNC thread form, meaning 5/16-inch major diameter with 18 coarse threads per inch, and an overall length of 2-23/32 inches. It is suited for both through-hole and blind-hole threading applications. Licensed tradespeople and machining professionals reach for this style of tap when precision, repeatable thread quality, and material versatility are required in production or maintenance work.

The plug tap chamfer style — with roughly 3 to 5 leading threads tapered to guide entry — makes the 1010028 a practical choice for general-purpose tapping in through holes and most blind-hole situations where full thread depth is not required right to the bottom. It performs in ferrous and non-ferrous metals, plastics, and composite materials in both shop and field environments.

Key Features

• Plug chamfer style suits through-hole and standard blind-hole applications
• 5/16-18 UNC coarse thread form for high thread engagement strength
• Overall length of 2-23/32 inches for reach in standard tap wrench or holder setups
• 1500 Series construction for consistent thread accuracy across a wide material range
• Sold individually — minimum order quantity of 1

Compatibility

Designed as a general-purpose hand tap for cutting 5/16-18 UNC coarse internal threads in through or blind holes across a wide variety of workpiece materials.

Installation Notes

Hand tapping should be performed by a qualified machinist or tradesperson using an appropriate tap wrench and cutting fluid suited to the workpiece material. Always ensure the tap is started square to the hole to prevent cross-threading or breakage. Back the tap off regularly to break chips, particularly in blind-hole applications. Do not force a tap that meets resistance — inspect for chip buildup or misalignment before continuing.

Technical Specifications

• Series: 1500
• Tap Type: Plug Tap
• Thread Size: 5/16-18 UNC
• Threads per Inch: 18 (coarse)
• Overall Length: 2-23/32 inches
• Weight: 0.6 pounds
• UPC: 698464014727

Standard Information

• Brand: PRECISION TWIST DRILL
• Manufacturer Part Number: 1010028