400N 29 PC NITRO Jobber Drill Set

DRILLCO 400N 29-Piece NITRO Jobber Drill Set — Heavy-Duty HSS Drilling from 1/16" to 1/2"

The DRILLCO 400N 29-Piece NITRO Jobber Drill Set is a premium-grade high speed steel drill set engineered for heavy-duty drilling in medium and high strength materials. Built to NAS Type B Jobber Length specifications, this set covers 1/16" through 1/2" by 64ths, providing contractors and trades professionals with a complete fractional size range for the most common drilling tasks. The 135° split point geometry and Black & Gold surface treatment deliver superior performance over standard HSS drills in both handheld and CNC applications. Speed, feed, and lubrication are all critical to cutting tool performance with this set.

Technical Specifications

Available Individual Sizes (400N Series — Fractional Jobber Length)

The NITRO 400N series outperforms standard HSS drills through the combination of M2 premium high speed steel, a self-centering 135° split point, and a Black & Gold surface treatment that provides maximum lubricity — advantages that standard bright-finish or black oxide drills do not offer. The NAS Type B jobber length design makes these drills the most versatile length for the widest range of job-site and shop applications, suitable for both handheld and CNC operations without requiring a tool change.

Key Features & Benefits

Premium M2 High Speed Steel Construction

All NITRO drills are manufactured from premium quality M2 High Speed Steel, the material of choice for heavy-duty drilling across a wide range of material groups including stainless steel. M2 HSS provides the hardness and toughness needed to maintain a cutting edge longer than standard HSS, reducing the frequency of bit replacement on demanding job sites.

135° Self-Centering Split Point

The 135° split point is self-centering, which reduces thrust requirements and minimizes walking when starting a hole — eliminating the need for a center punch in most applications. This four-facet geometry allows for faster penetration and is particularly effective on curved surfaces and when hand-drilling harder materials.

Black & Gold Surface Treatment for Maximum Lubricity

The body and flute of every NITRO drill receive a Black & Gold surface treatment that provides better resistance to corrosion and breakage while increasing lubricity and reducing chipping and flaking. Greater lubricity means less heat buildup at the cutting edge, which directly extends tool life during sustained drilling operations.

Jobber Length Versatility

Jobber length is the most common drill length because it provides extra reach and can be used in the majority of applications. This set's NAS Type B jobber length profile makes it suitable for use in portable hand drills, drill presses, and fixed-spindle CNC machines without requiring a length-specific setup.

Complete 29-Piece Fractional Size Range

The set contains 29 drills covering 1/16" through 1/2" by 64ths, giving contractors a complete fractional progression in a single kit. Having every size on hand eliminates job-site delays caused by missing intermediate sizes.

Heavy-Duty Design for Increased Tool Life and Performance

The NITRO series is specifically engineered for heavy-duty drilling, with a design that increases both tool life and performance compared to standard HSS drills. This makes the 400N29 set a cost-effective choice for contractors who drill frequently into medium and high strength materials.

Common Applications

Heavy-Duty Drilling in Medium and High Strength Steels

The M2 HSS construction and 135° split point make the NITRO 400N the recommended choice for drilling into medium and high strength steel where standard HSS drills wear prematurely.

Stainless Steel Drilling

The NITRO series is specifically recommended for heavy-duty drilling in stainless steel, a material group that demands higher tool hardness and lubricity than standard HSS can reliably provide.

CNC Machine Operations

The NAS Type B specification and self-centering split point make these drills ideal for fixed-spindle CNC applications where consistent hole location and reduced thrust are critical to part quality.

Handheld Portable Drill Operations

The jobber length and self-centering split point reduce walking on startup, making these drills well-suited for handheld drilling where a drill press or fixture is not available.

Drill Press Work

The complete 1/16"–1/2" size range by 64ths covers virtually all fractional hole sizes encountered in fabrication and construction work at the drill press.

Compatible Materials

• Medium strength steels
• High strength steels
• Stainless steel
• Most materials compatible with Black & Gold surface treatment

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.
• Grinding, cutting, machining, burning, and welding may release dusts, fumes, or vapors that present health hazards if exposure limits are exceeded.
• Excessive inhalation of metallic fumes and dusts may cause irritation of eyes, nose, and throat; symptoms may include metallic taste, dryness and irritation of the throat, chills, and fever persisting 12–48 hours.
• Chromium is listed as a carcinogen by NTP and OSHA; various forms of dermatitis and inflammation of the upper respiratory tract are associated with chromium exposure.
• Tungsten: some evidence of pulmonary involvement such as cough.
• Vanadium: eye and respiratory tract irritant.
• Cobalt dust inhalation may cause productive cough, wheezing, shortness of breath, chest tightness, and weight loss; interstitial fibrosis can lead to permanent disability.
• Skin contact with dust can cause irritation or allergic skin rash due to cobalt sensitization.
• NFPA Hazard Rating: Health 1; Flammability 0; Reactivity 0.
• Fine metal particles produced when ground or sawed can burn; high concentrations in air may present an explosion hazard.

Personal Protective Equipment

• Cloth or leather gloves when contact with dust or mist is likely.
• Safety glasses or goggles with side shields; do not wear contact lenses when handling these materials.
• 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.
• Use an appropriate NIOSH-approved respirator if airborne dust concentration exceeds the applicable PEL or TLV.
• Use local exhaust ventilation adequate to limit personal exposure to airborne dust below PEL or TLV levels.

Safe Handling

• Perform grinding, cutting, machining, burning, and welding operations in well-ventilated areas.
• Store in a dry place; store in a manner that prevents accidental environmental contamination from traces of industrial lubricants or wetting oils.
• Clean up using methods that avoid dust generation: vacuum with appropriate filters, wet dust mop, or wet clean-up.
• Wash hands thoroughly after handling and before eating or smoking; wash exposed skin at end of work shift.
• Do not shake clothing, rags, or other items to remove dust; remove dust by washing or vacuuming with appropriate filters.
• Soiled clothing should be laundered separately.
• Incompatible materials: strong acids, strong oxidizers.
• Emergency phone: CHEM-TEL INC 1-800-255-3924.

Frequently Asked Questions

Q: What drill length type is the 400N series?
A: The 400N series is NAS Type B Jobber Length — the most common drill length, providing extra reach suitable for the majority of drilling applications in both handheld and fixed-spindle setups.

Q: Are these drills suitable for CNC machine use?
A: Yes. The NITRO 400N drills are designed for use in both portable handheld drills and fixed-spindle applications including CNC machines and drill presses.

Q: What is the advantage of the 135° split point over a standard 118° conventional point?
A: The 135° split point is self-centering, which reduces thrust requirements and minimizes walking when starting a hole. This is especially beneficial on curved surfaces and when hand-drilling harder materials where a conventional point would tend to wander.

Q: What does the Black & Gold surface treatment do?
A: The Black & Gold surface treatment provides maximum lubricity across the body and flute of the drill, while also offering better resistance to corrosion and breakage and reducing chipping and flaking compared to uncoated or black oxide finishes.

Q: Can these drills be used on stainless steel?
A: Yes. The NITRO series is specifically recommended for heavy-duty drilling in stainless steel, in addition to a wide range of other medium and high strength material groups.

Q: What sizes are included in the 400N29 set?
A: The set contains 29 drills covering 1/16" through 1/2" by 64ths, providing a complete fractional progression for the most common hole sizes encountered in construction and fabrication work.