Counterbore HSS For Screw Size 5/16 MPN:303-0.3125

High-speed steel counterbores are the most common choice for creating a flat-bottomed cavity at the top of the hole so that a bolt, nut, or other part is hidden beneath or sits flush with the top of the hole when installed into it. High-speed steel is less brittle than cobalt and can better withstand vibration and chattering. Sometimes known as solid pilot counterbores, these counterbores have a built-in pilot that cannot be removed and which keeps the counterbore centered in the hole to ensure a level seat.

Technical Specifications

• Item Counterbore with Built-In Pilot
• Counterbore Type Oversized
• Material - Machining High Speed Steel
• Measurement System Fractional Inch
• Bore Dia. 5/16 in
• For Screw Size 5/16 in
• Pilot Dia. 21/64 in
• Oversized Increment 1/32 in
• Shank Dia. 3/8 in
• Overall Length 6 1/8 in
• Number of Flutes 4
• Spiral Direction Right Hand

Manufacturer Details

• Manufacturer: Yankee
• Condensed Mfg Number: 30303125
• MPN: 303-0.3125

Label Details

• Hazardous Material: N
• Green Material Flag: N
• Country of Origin: US
• CA Prop 65 Wht Label: N

Classification Details

• Harmonization Code: 8207600035
• GDS Category Name: Counterbores
• GDS Family Name: Drilling and Holemaking
• GDS Segment Name: Machining
• UNSPSC: 23171610
• UNSPSC Class ID: 16
• UNSPSC Commodity Name: Machine tools
• UNSPSC Commodity ID: 10
• UNSPSC Commodity Name: Reamers
• UNSPSC Family ID: 17
• UNSPSC Family Name: Workshop machinery and equipment and supplies
• UNSPSC Segment ID: 23
• UNSPSC Segment Name: Industrial Manufacturing and Processing Machinery and Accessories

Shipping Details

• Not For Sale In: HI AK PR