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ROCKY MOUNTAIN TWIST 100° Threaded-Shank Three-Flute Countersink - Threaded-Shank Three-Flute Countersinks
ROCKY MOUNTAIN TWISTThreaded-Shank Three-Flute Countersinks

ROCKY MOUNTAIN TWIST 100° Threaded-Shank Three-Flute Countersink

The ROCKY MOUNTAIN TWIST Countersink: 100° is a threaded-shank three-flute countersink with a 1/2 in body diameter and a 1/4"-28 shank thread size. It features a black oxide cobalt finish and is identified by…

SKU 3G-OTH-186102

Also listed as: 954CO510 · 954CO5 10

Brand
ROCKY MOUNTAIN TWIST
Item
100° Threaded-Shank Three-Flute Countersink
Part Number
954CO5-10
Category
Threaded-Shank Three-Flute Countersinks
Available to Order
Also known as:954CO5-10ROCKY MOUNTAIN TWIST
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Technical Specifications

ROCKY MOUNTAIN TWIST
Manufacturer Part Number
954CO5-10
Type
Black Oxide Cobalt
Flute
3
Shank
1/4"-28
Body Dia
1/2 in
Shank Thread Size
1/4"-28

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ROCKY MOUNTAIN TWIST Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The ROCKY MOUNTAIN TWIST Countersink: 100° is a threaded-shank three-flute countersink with a 1/2 in body diameter and a 1/4"-28 shank thread size. It features a black oxide cobalt finish and is identified by manufacturer part number 954CO5-10.

Frequently Asked Questions

What is the ROCKY MOUNTAIN TWIST 100° countersink used for?

The ROCKY MOUNTAIN TWIST 100° countersink is used to create a conical recess for flat-head screws in metalworking and woodworking. Its 100° angle suits aerospace and automotive applications where flush fastening is required. The three-flute design provides smooth cutting and reduced chatter.

What are the specifications of the ROCKY MOUNTAIN TWIST 954CO5-10 countersink?

The ROCKY MOUNTAIN TWIST 954CO5-10 is a 100° threaded-shank three-flute countersink with a 1/2 in body diameter and a 1/4"-28 shank thread size. It has a black oxide cobalt finish for heat resistance and durability. The manufacturer part number is 954CO5-10.

Where to buy ROCKY MOUNTAIN TWIST countersinks worldwide?

3G Electric supplies ROCKY MOUNTAIN TWIST countersinks worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us to source the 954CO5-10 or other ROCKY MOUNTAIN TWIST tooling for your operations.

How to select the correct ROCKY MOUNTAIN TWIST countersink for my application?

Select a ROCKY MOUNTAIN TWIST countersink by matching the shank thread size (e.g., 1/4"-28) to your tool holder and the body diameter (e.g., 1/2 in) to the screw head size. The 100° angle suits standard flat-head fasteners. For harder materials, choose the black oxide cobalt variant for extended tool life.

Used in

Common applications for ROCKY MOUNTAIN TWIST
Aerospace assembly — NAS 965 Type B compliant threaded-shank drill bits for drilling rivet holes in aluminum and titanium structures.
Automotive maintenance — #11 and #12 threaded-shank drill bits for repairing threaded holes and drilling out broken fasteners in engine blocks.
General metal fabrication — 1/4" diameter threaded-shank drill bits for creating precise holes in steel plates and profiles.
CNC machining — fractional and numbered threaded-shank drill bits mounted in quick-change tool holders for high-volume drilling.
Tool and die making — 5/32" and 7/32" threaded-shank drill bits for drilling water lines and ejector pin holes in mold bases.
Maintenance and repair — #35 and #4 threaded-shank drill bits for precision drilling in confined spaces using portable magnetic drill presses.
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ROCKY MOUNTAIN TWIST Products

3G Electric supplies ROCKY MOUNTAIN TWIST threaded-shank 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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