DRILLCO 4700SE 3-Piece Multi-Step Reamer Set — 15 Sizes in 3 M2 HSS Tools
The DRILLCO 4700SE 3-Piece Multi-Step Reamer Set (Item #470SESET) delivers 15 hole sizes across three tools, ranging from 5/16" through 1-1/16", making it a highly efficient solution for contractors and tradespeople who need to drill or enlarge holes in medium and high strength materials. Manufactured in the United Kingdom from premium M2 High Speed Steel, these reamers are engineered for structural steel erection, bridge construction and repair, bolt placement, and automotive applications. Each tool features a 118° special drill point and a 3/8" reduced shank with 3 flats, providing secure chuck engagement and the ability to start a new hole from scratch or enlarge existing holes in material up to 1" thick.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | DRILLCO |
| Item # | 470SESET |
| UPC | 045997492766 |
| Country of Origin | United Kingdom |
| Material | M2 HSS (High Speed Steel) |
| Surface Treatment | Black oxide |
| Shank | 3/8" reduced shank with 3 flats |
| Drill Point | 118° special drill point |
| Applications | Drilling holes in medium and high strength materials; enlarging holes in material up to 1" thick |
| Sizes Included | 15 sizes across 3 tools (Set #1–3) |
| Size Range | 5/16" through 1-1/16" |
| Set Contents | 1 of each reamer (Tools #1, #2, #3) |
Available Items
| Item # | Description | Sizes |
|---|---|---|
| 470SE001 | Tool #1 — 5 Steps | 5/16", 3/8", 7/16", 1/2", 9/16" |
| 470SE002 | Tool #2 — 5 Steps | 9/16", 5/8", 11/16", 3/4", 13/16" |
| 470SE003 | Tool #3 — 5 Steps | 13/16", 7/8", 15/16", 1", 1-1/16" |
| 470SESET | 3-Piece Set — 1 of each reamer | 5/16" through 1-1/16" (15 sizes) |
Unlike standard step drills that are limited to thinner sheet material, the DRILLCO 4700SE set is designed to ream steel plate up to 1" thick and can also realign badly misaligned holes to allow fasteners to pass through — a capability critical in structural steel and bridge work. The special split-point geometry eliminates walking at the start of the cut, allowing the tool to initiate a new hole from scratch without a center punch, saving setup time on the job site.
Key Features & Benefits
Premium M2 High Speed Steel Construction
Each reamer is manufactured from premium grade M2 HSS, providing the hardness and toughness required for drilling and enlarging holes in medium and high strength materials. M2 HSS maintains its cutting edge longer than standard tool steel, reducing replacement frequency and downtime on demanding structural jobs.
Black Oxide Surface Treatment
The black oxide finish increases wear resistance and reduces friction during cutting operations, extending tool life compared to uncoated HSS tools. This surface treatment is well suited for performance on low to medium tensile strength materials encountered in structural steel and fabrication work.
3/8" Reduced Shank with 3 Flats
The 3/8" reduced shank features three machined flats that lock securely in the drill chuck, preventing slippage under torque. This design ensures consistent, controlled cutting even in high-load applications where a round shank would be prone to spinning.
118° Special Drill Point with Split-Point Geometry
The special geometry split point reduces walking when beginning the reaming process, eliminating the need for a center punch and allowing the tool to start a new hole from scratch. This self-starting capability speeds up workflow and improves hole placement accuracy on structural steel components.
15 Sizes in 3 Tools
The stepped geometry delivers five hole sizes per tool, covering 5/16" through 1-1/16" across the complete set. Contractors can carry three tools instead of fifteen individual bits, reducing tool inventory and changeover time on the job site.
Capable of Reaming Up to 1" Thick Steel Plate
Unlike lighter-duty step drills rated for thin sheet metal, the 4700SE set is engineered to enlarge holes in material up to 1" thick. This makes the set practical for heavy structural steel erection and bridge construction applications where plate thickness is substantial.
Common Applications
Structural Steel Erection
Used to drill and enlarge bolt holes in structural steel members during erection, ensuring fasteners align and seat correctly through thick plate.
Structural Bolt Placement
Enlarges or realigns misaligned holes in steel connections to allow structural bolts to pass through, a common requirement during steel frame assembly.
Bridge Construction and Repair
The set's ability to ream steel plate up to 1" thick and correct misaligned holes makes it well suited for bridge fabrication and field repair operations.
Drilling Holes in Medium and High Strength Materials
M2 HSS construction allows the tools to initiate and complete new holes in medium and high strength steel where standard HSS step drills may struggle.
Enlarging Existing Holes
The stepped geometry efficiently opens existing undersized holes to a new diameter in a single pass, eliminating the need for multiple drill changes.
Automotive Industry Applications
The set's range of 15 sizes and clean hole-making capability make it applicable to automotive fabrication and repair tasks requiring precise hole sizing in steel components.
Compatible Materials
- Medium strength steel
- High strength steel
- Structural steel plate (up to 1" thick)
- Steel fabrications requiring hole enlargement or realignment
Product Documents
Safety Data Summary
Hazard Information
- During normal use, HSS cutting tools do not present inhalation, ingestion, or chemical hazards.
- Grinding, cutting, machining, burning, or 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, chills, and fever persisting 12–48 hours.
- Chromium is listed as a carcinogen by NTP and OSHA; exposure may cause dermatitis, upper respiratory tract inflammation, and possibly nasal/lung cancer.
- Cobalt dust inhalation may cause respiratory disease including occupational asthma and interstitial fibrosis.
- 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.
- Fine metal particles produced during grinding 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; do not wear contact lenses when handling.
- Cloth or leather gloves recommended when contact with dust or mist is likely.
- Use an appropriate NIOSH-approved respirator if airborne dust concentration exceeds applicable PEL or TLV.
- Hearing protection may be required.
- Always use machine guards and protective clothing to prevent injury in the event of tool breakage.
- Employer should provide an eye wash station within the immediate work area.
Safe Handling
- Perform grinding, welding, or dust-generating operations only in well-ventilated areas with local exhaust ventilation.
- Store in a dry place; store in a manner that prevents accidental environmental contamination from 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 with strong acids and strong oxidizers.
- For powder fires: smother with dry sand, dry dolomite, ABC-type fire extinguisher, or flood with water; do not release runoff to swales or waterways.
- Dispose of in compliance with federal, state/provincial, and local environmental regulations; send to an appropriate reclamation facility if available.
Frequently Asked Questions
Q: How many hole sizes does the complete 3-piece set cover?
A: The 470SESET covers 15 sizes in total — five sizes per tool — ranging from 5/16" through 1-1/16".
Q: What is the maximum material thickness these reamers can handle?
A: The 4700SE multi-step reamers are designed to enlarge holes in material up to 1" thick.
Q: Can these reamers start a new hole, or are they only for enlarging existing holes?
A: The special geometry split point allows the tool to start a new hole from scratch, in addition to enlarging or realigning existing holes.
Q: Why does the shank have 3 flats instead of a standard round shank?
A: The three machined flats on the 3/8" reduced shank prevent slippage in the drill chuck under torque, providing more secure and consistent cutting performance.
Q: What shank size do these reamers use?
A: All three tools in the set use a 3/8" reduced shank with 3 flats, compatible with standard drill chucks that accept 3/8" shanks.
Q: Can these reamers be used to correct misaligned holes in structural steel?
A: Yes. The reamers are specifically designed to realign badly misaligned holes to allow fasteners to pass through, which is a common requirement in structural steel erection and bridge work.