The Sutton M3–M12 14 Piece Tap and Drill Set (T3850014) is a professional-grade threading kit designed for cutting accurate internal threads in metal, plastics, and general engineering materials.

This all-in-one set includes both HSS taps and matching tapping drills, providing everything needed to create correctly sized threaded holes for M3 to M12 metric fasteners.

Ideal for workshops, maintenance teams, electricians, mechanics, and general engineering applications.

What This Tap & Drill Set Is Used For

This kit is used to create internal threads in pre-drilled holes so bolts and screws can be securely fastened.

Common applications include:

• repairing damaged threads
• creating new threaded holes in metal components
• workshop fabrication and maintenance
• automotive and mechanical repair work
• general engineering assembly tasks

Key Features

• 14-piece complete tap and drill set
• Covers M3 to M12 metric coarse threads
• Includes matched HSS tapping drills for accurate thread sizing
• Suitable for hand tools and machine use
• Designed for general-purpose engineering materials
• Manufactured from high-speed steel (HSS) for durability
• Suitable for through and blind hole applications

Included Sizes

This set covers:

Taps

• M3
• M4
• M5
• M6
• M8
• M10
• M12

Matching Drill Sizes

• 2.5mm
• 3.3mm
• 4.2mm
• 5.0mm
• 6.8mm
• 8.5mm
• 10.2mm

Why This Set Is Valuable

Instead of calculating tap drill sizes manually, this kit provides:

• correctly matched drill sizes for each tap
• reduced risk of broken taps
• faster workflow in workshop environments
• consistent thread quality
• improved accuracy for mechanical fastening

 This makes it ideal for both apprentices and experienced tradespeople.

Key Benefits

• Complete threading solution in one kit
• Accurate hole-to-thread matching
• Reduces tap breakage and rework
• Suitable for workshop and site use
• Covers most common metric thread sizes

Applications

This set is commonly used in:

Automotive

• engine components
• brackets and housings
• thread repair work

Engineering & Fabrication

• steel fabrication
• machinery assembly
• repair and modification work

Maintenance & Trades

• onsite equipment repair
• plant maintenance
• general workshop threading tasks

Material & Performance

Manufactured from high-speed steel (HSS), the taps and drills are designed to:

• maintain sharp cutting edges under load
• resist wear in repeated use
• perform reliably in steel and general metals up to ~1000 N/mm²
• support both hand tapping and machine-assisted operation

Usage Tips

For best results:

• use correct drill size before tapping
• apply cutting fluid when working in metal
• back off regularly when tapping to clear chips
• avoid excessive force to prevent tap breakage
• keep taps aligned to avoid cross-threading

Limitations

• Not designed for hardened steel or high-alloy materials
• Best suited for general engineering metals and softer steels
• Requires correct technique to avoid tap damage

Product Specifications

• Product code: T3850014
• Brand: Sutton Tools
• Type: Tap and drill set
• Pieces: 14
• Thread range: M3–M12
• Material: High Speed Steel (HSS)
• Application: Metal, plastics, general engineering
• Standard: Metric coarse thread

Who This Product Is For

Ideal for:

• mechanics and automotive technicians
• engineers and fabricators
• maintenance fitters
• electricians and installers
• apprentices and trade students