Counterbores N with a diameter of 50mm and larger are all made with a driving lip. These sizes should be used in the appropriate type M toolholder.

Dimensions (mm) N, NA & W
Counterbores N, and NA with Ø of 50 mm and larger are all made with a driving lip. These sizes should be used in the appropriate type M toolholder
d: 14.0; d1: 6.0; L: 48.0; L1: 28.0.

FC04 flanged nut manufactured from hardy carbon steel in a black oxide finish for added durability. Available in a range of metric sizes.

Features and Benefits
• Medium carbon steel with HRC 30 - 35 hardness for durability
• Black oxide finish for improved durability

Typical Applications
• Fastenings
• Industrial tooling

Notes
• Available in a range of metric sizes 22-40mm

Heavy duty construction manufactured from HSS and cobalt for increased hardness and durability with 6 flutes for improved cutting performance and chip control.

Features and Benefits
• HHS-Co construction for improved hardness
• 6 flutes for improved chip control and cutting efficiency

Typical Applications
• Countersinking

Standards
• Manufactured to BS 328:Part 5:1983

Designed with spiral flutes and various lengths and forms to give high quality centre holes that suit most applications. TiN coating on working parts for increased heat and wear resistance, offering a prolong efficient cutting lifespan.

Features and Benefits
• HSS construction for increased durabiluty
• TiN coating for increased heat and wear resistance
• Delivers high quality centre holes in most drilling applications

Typical Applications
• Drilling

Standards
• BS 328 : Part 2 : 1986,
• DIN 333A, ISO 866, ISO 2540, ISO 2541