400N NITRO Jobber Drill Set

DRILLCO 400N NITRO 15-Piece Jobber Drill Set — Heavy-Duty HSS Performance for Medium and High Strength Materials

The DRILLCO 400N NITRO 15-Piece Jobber Drill Set is a premium grade High Speed Steel (HSS) 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 32nds, making it a versatile solution for contractors and trades professionals who need reliable hole-making across a broad range of applications. The 135° split point geometry reduces walking at startup and lowers thrust requirements, while the black and gold surface treatment maximizes lubricity throughout the cut. Suitable for both handheld portable drills and fixed-spindle CNC operations, this set is manufactured in the United States.

Technical Specifications

Available Sizes — 400N Series (Individual Drills)

The 400N NITRO series offers superior performance over standard HSS drills through its combination of premium M2 HSS construction, black and gold surface treatment for maximum lubricity, and a self-centering 135° split point — features that together extend tool life and reduce the thrust required to start and complete each hole. Unlike bright-finish or black oxide drills suited only for softer materials, the black and gold treatment provides better corrosion resistance and lubricity across a wide range of material groups, including stainless steel.

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 in medium and high strength materials. M2 HSS construction means the drills maintain their cutting edge longer under demanding conditions, reducing the frequency of bit changes on the job.

135° Self-Centering Split Point

The 135° split point geometry is self-centering, which reduces walking when starting a hole and lowers thrust requirements compared to a conventional 118° point. This is especially valuable when drilling on curved surfaces or in handheld applications where maintaining precise hole location is critical.

Black and Gold Surface Treatment

The body and flute of each drill are black and gold surface treated for maximum lubricity, which reduces friction and heat buildup during the cut. This treatment also provides better resistance to corrosion and breakage while reducing chipping and flaking, extending the working life of each drill.

Jobber Length for Versatile Reach

Jobber length is the most common drill length because it provides extra reach and can be used in the majority of drilling applications. This set's jobber length configuration makes it suitable for general-purpose work across a wide variety of job site conditions.

Dual-Use Design: Handheld and CNC

The 400N NITRO drills are designed for use in both portable handheld drills and fixed-spindle applications such as CNC machines and drill presses. This flexibility means a single set can serve across multiple setups on the same job site without requiring separate tooling.

NAS Type B Specification

Built to NAS Type B jobber length standards, these drills meet the dimensional and performance requirements expected in professional and industrial metalworking environments. The NAS Type B designation ensures consistent shank and flute geometry across the set.

Common Applications

Heavy-Duty Drilling in Medium and High Strength Steels

The 400N NITRO set is specifically recommended for heavy-duty drilling in medium and high strength materials, including stainless steel, where standard HSS drills may wear prematurely.

Handheld Portable Drill Operations

The self-centering split point and black and gold surface treatment make these drills well-suited for handheld drilling where controlling walking and heat buildup is a constant challenge.

CNC Machine and Drill Press Operations

The NAS Type B specification and consistent geometry make the 400N series appropriate for fixed-spindle CNC and drill press applications requiring repeatable, accurate hole placement.

General Metalworking and Fabrication

With a size range of 1/16" through 1/2" by 32nds, this 15-piece set covers the most commonly needed fractional drill sizes for structural fabrication, mechanical assembly, and general metalworking tasks.

Compatible Materials

• Medium strength steels
• High strength steels
• Stainless steel
• Most materials (per black and gold surface treatment designation)

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 that can 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 to 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 is identified as the most probable cause of respiratory diseases including occupational asthma and interstitial fibrosis.
• 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

• Wear safety glasses or goggles with side shields; contact lenses should not be worn when handling these materials.
• Cloth or leather gloves are recommended when contact with dust or mist is likely.
• Use an appropriate NIOSH-approved respirator if airborne dust concentration exceeds the applicable PEL or TLV.
• Hearing protection might be required.
• Always use machine guards and wear protective clothing to prevent injury in the event of tool breakage.
• Employer should provide an eye wash station within the immediate work area for emergency use.

Safe Handling

• Use only with local exhaust ventilation adequate to limit personal exposure to airborne dust below PEL or TLV levels.
• Clean up using methods that 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.
• 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.
• Soiled clothing should be laundered separately.
• Incompatible with strong acids and strong oxidizers.
• Dispose of in compliance with federal, state/provincial, and local environmental regulations, or send to an appropriate reclamation facility.

Frequently Asked Questions

Q: What materials are these drills designed to cut?
A: The 400N NITRO drills are recommended for drilling holes in medium and high strength materials, including stainless steel. The black and gold surface treatment is rated for use on most materials.

Q: Can these drills be used in a CNC machine as well as a handheld drill?
A: Yes. The 400N NITRO drills are designed for use in both portable handheld drills and fixed-spindle applications such as CNC machines and drill presses.

Q: What size range does this 15-piece set cover?
A: The set covers 1/16" through 1/2" by 32nds, providing 15 fractional sizes across that range.

Q: Why does the 135° split point matter compared to a standard 118° point?
A: The 135° split point is self-centering, which reduces walking when starting a hole and lowers the thrust required to penetrate the material. This is particularly beneficial on curved surfaces and in handheld drilling situations.

Q: What is the purpose of the black and gold surface treatment?
A: The black and gold surface treatment is applied to the body and flute for maximum lubricity, which reduces friction and heat during cutting. It also provides better resistance to corrosion and breakage and reduces chipping and flaking compared to untreated drills.

Q: Are individual drill sizes from the 400N series available separately?
A: Yes. Individual 400N drills are available from 1/16" through 1/2" as single units (EDP numbers 400N104 through 400N132) and in blister packs (e.g., 400N104BP through 400N132BP), covering the full fractional range by 64ths.