350N NITRO Mechanic Set, 29 PC

DRILLCO 350N NITRO Mechanic Set, 29 PC — Heavy-Duty HSS Drilling Performance in a Complete Set

The DRILLCO 350N NITRO Mechanic Set is a 29-piece premium grade HSS drill bit set covering 1/16" to 1/2" by 64ths, built for heavy-duty drilling in medium and high strength materials. Manufactured to NAS Type B specifications, these mechanic's length drills are engineered for both handheld power tools and fixed-spindle CNC operations. The black and gold surface treatment maximizes lubricity, while the 135° split point and 3-flats shank deliver self-centering accuracy and reduced chuck slippage. Made in the United States, this set is designed for trades professionals and contractors who demand consistent tool life and performance across demanding drilling applications.

Technical Specifications

Available Sizes

HSS Material Composition (from SDS)

Physical & Chemical Properties (from SDS)

Regulatory & Compliance Information

The 350N NITRO Mechanic Set distinguishes itself from standard HSS drill sets through its NAS Type B specification, mechanic's length design for improved rigidity and accuracy in confined spaces, and the black and gold surface treatment that provides superior lubricity compared to bright finish or black oxide alternatives. The 3-flats shank — a feature specific to the mechanic's length 350N series — actively reduces slippage in drill chucks, a critical advantage when working with handheld power tools on harder materials.

Key Features & Benefits

Premium M2 High Speed Steel Construction

All NITRO drills are manufactured from premium quality M2 High Speed Steel, providing the hardness and wear resistance needed for heavy-duty drilling across a wide range of material groups including stainless steel. M2 HSS delivers longer tool life compared to general-purpose HSS, reducing the frequency of bit replacement on demanding jobsites.

135° Split Point for Self-Centering Accuracy

The 135° split point is self-centering, eliminating the need for a center punch and reducing bit walking when starting a hole — especially valuable on curved or hard surfaces. This design also reduces thrust requirements, meaning less force is needed to initiate the cut, which reduces operator fatigue during extended handheld drilling operations.

Black and Gold Surface Treatment for Maximum Lubricity

The black and gold surface treatment applied to the body and flutes provides maximum lubricity, reducing friction and heat buildup during drilling. This treatment also offers better resistance to corrosion and breakage while reducing chipping and flaking, extending the usable life of each bit in the set.

3-Flats Shank for Reduced Chuck Slippage

The 3-flats shank design is a feature specific to the mechanic's length 350N series and actively prevents the bit from rotating within the drill chuck under load. This is particularly important when drilling with handheld power tools where torque and vibration can cause round-shank bits to slip, compromising hole accuracy and safety.

Mechanic's Length Design for Tighter Spaces

Mechanic's length drills are shorter than jobber length drills, providing better rigidity, improved accuracy, and reduced deflection and breakage risk. This makes the 350N set well-suited for drilling in confined or restricted-access areas where a longer bit would be impractical or unsafe.

Dual-Use: Handheld and CNC Compatible

The 350N NITRO set is designed for use in both portable handheld power drills and fixed-spindle applications such as CNC machines and drill presses. This versatility makes the set a practical investment for contractors and shops that operate across multiple drilling environments.

Common Applications

Drilling in Medium and High Strength Materials

The premium M2 HSS construction and black and gold surface treatment make the 350N NITRO set recommended for heavy-duty drilling in a wide range of material groups, including stainless steel and other high-strength metals.

Heavy-Duty Drilling Operations

The NAS Type B specification and heavy-duty design increase tool life and performance in demanding drilling scenarios where standard HSS drills would wear prematurely.

Drilling in Tighter, More Confined Spaces

The mechanic's length format provides better rigidity and accuracy in restricted-access areas, making these bits the preferred choice when jobber length drills are too long to maneuver safely.

Handheld Power Tool Drilling

The 3-flats shank and 135° split point are specifically engineered to perform in handheld drill applications, where chuck slippage and bit walking are common challenges on harder materials.

CNC Machine and Drill Press Operations

The NAS Type B specification and split point design make the 350N set suitable for fixed-spindle CNC and drill press applications requiring consistent, repeatable hole quality.

Product Documents

• Safety Data Sheet (SDS)
• Product Sheet
• Linecard

Safety Data Summary

Hazard Information

• During normal operation and usage, high speed steel products do not present inhalation, ingestion, or other chemical hazards.
• Operations such as grinding, cutting, machining, burning, and welding may release dusts, fumes, or vapors which may present health hazards if exposure limits are exceeded.
• Excessive inhalation of metallic fumes and dusts may result in irritation of eyes, nose, and throat; symptoms may include metallic taste, dryness and irritation of the throat, chills and fever, persisting 12 to 48 hours.
• Chromium: listed as carcinogen by NTP and OSHA; associated with dermatitis, inflammation and/or ulceration of the upper respiratory tract, and possibly cancer of nasal passages and lungs.
• Tungsten: some evidence of pulmonary involvement such as cough.
• Vanadium: eye and respiratory tract irritant.
• Molybdenum: eye and mucous membrane irritant; individuals with kidney, chronic respiratory, or liver disease may be at increased risk.
• Cobalt dust is identified as the most probable cause of respiratory diseases including occupational asthma and interstitial fibrosis.
• Skin contact: can cause irritation or allergic skin rash due to cobalt sensitization.
• Fine metal particles produced when ground or sawed can burn; high concentrations in air may present an explosion hazard.
• NFPA Hazard Rating: Health 1; Flammability 0; Reactivity 0

Personal Protective Equipment

• Protective gloves: Cloth or leather gloves recommended when contact with dust or mist is likely.
• Eye protection: Wear safety glasses or goggles with side shields. Contact lenses should not be worn when handling these materials. Employer should provide an eye wash station within the immediate work area.
• Hearing protection may be required.
• Always use machine guards and wear safety glasses and protective clothing to prevent injury in the event of tool breakage.
• Respiratory protection: Use an appropriate NIOSH approved respirator if airborne dust concentration exceeds the appropriate PEL or TLV, per 29 CFR 1910.134.
• Soiled clothing should be laundered separately.

Safe Handling

• Use local exhaust ventilation adequate to limit personal exposure to airborne dust to levels that do not exceed the PEL or TLV.
• All operations that generate dust or fumes should be performed in well-ventilated areas.
• Wash hands thoroughly after handling and before eating or smoking. Wash exposed skin at the end of the work shift.
• Do not shake clothing, rags, or other items to remove dust; remove dust by washing or vacuuming with appropriate filters.
• Clean up using methods to avoid dust generation such as vacuum (with appropriate filters), wet dust mop, or wet clean up.
• Store in a dry place. Store in a manner that prevents accidental environmental contamination from traces of industrial lubricants or wetting oils.
• Incompatible materials: Strong Acids, Strong Oxidizers.
• Waste disposal: Send to an appropriate reclamation facility if available; otherwise dispose in compliance with federal, state/provincial, and local environmental regulations.

Frequently Asked Questions

Q: What materials are the 350N NITRO drills recommended for?
A: The 350N NITRO set is recommended for heavy-duty drilling in a wide range of material groups, including medium and high strength materials and stainless steel.

Q: What is the difference between the 350N mechanic's length and the 400N jobber length NITRO drills?
A: The 350N is mechanic's length (shorter than jobber length), which provides better rigidity, improved accuracy, reduced deflection and breakage risk, and is better suited for drilling in tighter, more confined spaces. The 400N is jobber length, which provides extra reach and can be used in most general applications. Both share the same black and gold surface treatment and 135° split point.

Q: Can these drills be used in both handheld drills and CNC machines?
A: Yes. The 350N NITRO set is designed for use in both portable handheld power drills and fixed-spindle applications such as CNC machines and drill presses.

Q: What does the 3-flats shank do, and is it on all NITRO drills?
A: The 3-flats shank reduces slippage in the drill chuck. According to the product sheet, the 3-flat shank is a feature specific to the mechanic's length (350N) drills in the NITRO line.

Q: What size range does the 350N29 set cover?
A: The set contains 29 drills covering 1/16" to 1/2" by 64ths.

Q: Are there any tips for maximizing the life of these drill bits?
A: Speed, feed, and lubrication are all critical to cutting tool performance. The product sheet also notes that using metal cutting lubricants can increase drill life.