27/64″ OSG Series 5770 Solid Drill Bit – Precision 0.4219″ Diameter, 2-Flute, Straight Shank, Factory Safety Wax Tip Seal

27/64″ OSG Series 5770 Solid Drill Bit – Precision 0.4219″ Diameter, 2-Flute, Straight Shank, Factory Safety Wax Tip Seal

Condition: New – Never used; cutting edges are fully covered by original red protective wax/safety tip coating, shank is clean with no chuck marks or discoloration.

Description

This is a 27/64 inch (0.4219″) OSG Series 5770 drill bit, a high-accuracy solid drill designed for precision holemaking in steels and general engineering alloys. The bit features a ground straight shank and 2-flute right-hand spiral for reliable chip evacuation and accurate guidance in the workpiece. The business end is covered with a red rubber-like safety wax seal, applied at the factory to protect the cutting lips from damage and corrosion during shipping and storage. Once removed, you have a fully sharp, ready-to-run drill suitable for production machining or fine repair work.

Features

• Drill size: 27/64″ (0.4219″) nominal diameter
• Series: OSG 5770 (solid drill family)
• Construction: Precision ground solid body
• Flutes: 2-flute, right-hand spiral for balanced cutting and chip flow
• Shank: Straight shank, ground, sized to standard for positive chuck grip
• Point: Standard high-performance drill point geometry (OSG pattern) for accurate starting and reduced walking
• Tip protection:
  • Factory-applied red protective wax / safety coating over cutting edges
  • Prevents edge chipping, corrosion, and accidental injury before first use
• Finish/coating: Factory dark finish on the fluted section (typical of performance drills; exact coating depends on sub-series)
• Material: High-quality tool steel / carbide-grade body (depending on specific 5770 sub-family) engineered for long service life
• Cutting direction: Right-hand cut, right-hand helix

(If you have the original tube/label I can decode the exact substrate and coating for you—WXL, TiAlN, etc.)

Applications

Ideal for:

• Precision drilling of carbon steel, alloy steel, and tool steel (depending on machine setup and cutting data)
• General machining, maintenance and repair operations where a true 27/64″ pilot or tap-drill is required
• Fabrication shops needing accurate mid-size holes prior to reaming or tapping
• Tool & die work for dowel-pin or clearance holes close to 3/8″–7/16″ region
• Use in:
  • Manual drill presses
  • Milling machines
  • CNC machining centers with appropriate holders and speeds/feeds

Always match speed, feed, and coolant to the base material and the particular OSG 5770 grade you have.

Cross-Referenced / Equivalent Sizes

While this listing is for an OSG Series 5770 27/64″, users often cross-reference it to:

• 27/64″ high-performance drills in other OSG series (jobber or stub length)
• 11.0 mm or 10.8–10.9 mm metric drills used as near-equivalents when metric tooling is stocked
• Tap-drill recommendations where 27/64″ is specified for certain 1/2″–13 or similar thread preparations (depending on fit requirements)

Comparable Products

Comparable drills (same size / similar performance class) from other manufacturers include:

• Guhring premium HSS or carbide 27/64″ jobber drills
• Dormer Pramet 27/64″ A002 / A108 series jobber drills
• MSC / Titex / Walter solid drills in 0.4219″ size
• Niagara / Cleveland cobalt jobber drills in 27/64″

These are mentioned only as performance peers; geometry, coating, and substrate will differ.

Use in Larger Tooling Systems

This 27/64″ drill can be part of:

• Tapping setups – as a pilot drill in a multi-step operation prior to threading
• Bushing-guided drilling fixtures – used with drill bushings in jigs and fixtures for repeatable hole locations
• CNC tool libraries – as the dedicated 0.4219″ roughing/pilot drill in automated cycles

Pair it with:

• Quality ER collet chucks, Weldon-shank end-mill holders, or keyed chucks
• Appropriate cutting fluid or coolant delivery system to maximize life and finish

Related

• 27/64 inch drill bit
• 0.4219″ precision twist drill
• OSG 5770 series drill
• high-performance cobalt / carbide drill for steel
• jobber-length machine drill
• drill with protective wax tip coating
• pilot drill for 1/2″ tapping operations

Common Requests:

1. “What size is 27/64 drill in decimal inches for CNC programming?”
2. “Is the red wax on an OSG drill bit supposed to be removed before drilling?”
3. “Recommended speeds/feeds for OSG 27/64″ drill in mild steel?”
4. “Can I use an OSG Series 5770 drill in a handheld drill, or is it for machines only?”
5. “What tap sizes use a 27/64″ drill as the tap drill?”

Trademark Notice: OSG and any other manufacturer names mentioned are trademarks or registered trademarks of their respective owners. They are used here strictly for identification, compatibility, and descriptive purposes only, with no affiliation or endorsement implied.