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

ROCKY MOUNTAIN TWIST 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-186097

Also listed as: 954CO540 · 954CO5 40

Brand
ROCKY MOUNTAIN TWIST
Item
Threaded-Shank Three-Flute Countersink
Part Number
954CO5-40
Category
Threaded-Shank Three-Flute Countersinks
Available to Order
Also known as:954CO5-40ROCKY MOUNTAIN TWIST
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.

Technical Specifications

ROCKY MOUNTAIN TWIST
Manufacturer Part Number
954CO5-40
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 954CO5-40.

Frequently Asked Questions

What is the ROCKY MOUNTAIN TWIST Countersink: 100° used for?

This countersink is used to create a conical recess for flat-head screws in metalworking and woodworking applications. The 100° angle is common in aerospace and precision machining. Its three-flute design provides smooth cutting and reduced chatter, making it suitable for production environments.

What are the specifications of the ROCKY MOUNTAIN TWIST Countersink: 100°?

The ROCKY MOUNTAIN TWIST Countersink: 100° has a 1/2 in body diameter and a 1/4"-28 shank thread size. It features a black oxide cobalt finish for heat resistance and durability. The manufacturer part number is 954CO5-40. It is a three-flute, threaded-shank countersink designed for precision countersinking.

Where to buy the ROCKY MOUNTAIN TWIST Countersink: 100° worldwide?

You can source the ROCKY MOUNTAIN TWIST Countersink: 100° through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time; we supply this countersink to customers across multiple industries.

How to select the correct ROCKY MOUNTAIN TWIST Countersink: 100°?

Select this countersink by matching the shank thread size (1/4"-28) to your tool holder or drill. Ensure the 100° angle matches your screw head requirement. The 1/2 in body diameter suits medium-depth countersinking. For hard materials, the black oxide cobalt finish provides extended tool life. Always verify the manufacturer part number 954CO5-40.

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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