CHICAGO-LATROBEGeneral Purpose Three-Flute Countersinks

CHICAGO-LATROBE Countersink: 100°, 3 Flute, 3/8 in Body Dia

The CHICAGO-LATROBE Countersink is a 100°, general purpose three-flute countersink made from black oxide high speed steel. It has a 3/8 in body diameter and is identified by manufacturer part number 56878.

SKU 3G-OTH-184670

Brand

CHICAGO-LATROBE

Item

Countersink: 100°, 3 Flute, 3/8 in Body Dia

Local availability & support

Delivery: Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment: Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

CHICAGO-LATROBE

Manufacturer Part Number

56878

Type

Black Oxide High Speed Steel 

Flute

3

Body Dia

3/8 in 

Technical Documents

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CHICAGO-LATROBE Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Frequently Asked Questions

What is a CHICAGO-LATROBE 3-flute countersink used for?

A CHICAGO-LATROBE 3-flute countersink creates a 100° chamfer around a drilled hole to recess screw heads flush with the workpiece surface. It is used in metalworking, machining, and fabrication for deburring and preparing holes for flat-head fasteners.

What are the specifications of the CHICAGO-LATROBE 56878 countersink?

The CHICAGO-LATROBE 56878 is a general-purpose three-flute countersink with a 100° included angle. It has a 3/8 in body diameter and is made from black oxide high-speed steel. The black oxide coating provides wear resistance and reduces friction during use.

Where to buy CHICAGO-LATROBE countersinks worldwide?

3G Electric supplies CHICAGO-LATROBE countersinks worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on the 56878 or other CHICAGO-LATROBE tooling.

How to select the right countersink for a job?

Match the countersink angle to your fastener head angle — 100° is common for metric flat-head screws. Choose flute count based on material: 3-flute designs like the CHICAGO-LATROBE 56878 reduce chatter in steel and aluminum. Ensure body diameter clears the hole size without interference.

Used in

Common applications for CHICAGO-LATROBE

Aerospace assembly — Chicago-Latrobe NAS 907 Type B aircraft-extension drill bits for drilling fastener holes in aluminum and titanium skins.

Metal fabrication — Chicago-Latrobe reduced-shank drill bit sets for enlarging holes in structural steel using magnetic drill presses.

Maintenance repair — Chicago-Latrobe left-hand cobalt jobber-length drill bits for removing broken bolts in machinery.

Tool and die making — Chicago-Latrobe jobber-length drill bit sets with 135° split point for precision hole drilling in hardened steels.

Automotive repair — Chicago-Latrobe spiral-flute screw extractors for removing seized fasteners in engine blocks or exhaust systems.

General manufacturing — Chicago-Latrobe HSS jobber-length drill bits for production drilling in mild steel and cast iron.

CHICAGO-LATROBE Products

3G Electric supplies CHICAGO-LATROBE general purpose three-flute countersinks. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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