AMSUO Stepped-Tip Jobber Length Drill Bits, HSS, 3 Flat Shank — Fractional Set 1/16" to 1/2", 29-Pc, Black & Gold Finish

AMSUO — PROFESSIONAL DRILLING SOLUTIONS

Stepped-Tip Jobber Length Drill Bits · 3 Flat Shank · 1/16" – 1/2"

FULL FRACTIONAL RANGE FOR METAL, WOOD AND PLASTIC

Stepped-Tip Point | Three Flat Shank | Black & Gold Finish

29 SIZES · 1/16" – 1/2" · 1/64" INCREMENT · 29-PC SET IN STORAGE CASE · M2 / M35 / M42 HSS

Key Selling Points

1. Stepped-tip point — the point is ground as a series of fine concentric steps instead of one continuous taper. Each step takes a small cut, so the bit starts on sheet metal, tube, thin-wall and curved surfaces with less skating and far less risk of grabbing the work and spinning it.
2. Three flat shank — three flats are ground at 120° onto the shank so the chuck jaws seat on flat faces instead of relying on friction alone. Less slipping in the chuck under load, and more of the motor’s torque reaches the cutting edge.
3. Black & gold finish — a two-tone surface: gold-tone coating on the flutes and cutting edges for surface hardness and heat resistance, black-oxide on the shank for corrosion protection and grip. The contrast also makes wear easy to read at a glance.
4. Full fractional range in one case — 29 sizes from 1/16" to 1/2" in 1/64" increments, so one set covers pilot holes through clearance and assembly holes. Sizes are reordered by number, not measured by feel.
5. Three body materials, one geometry — choose M2 (HSS) for general steel and wood work, or cobalt-bearing M35 / M42 for stainless steel and harder alloys. Same stepped point and same shank across all three, so tooling and handling stay identical.
6. Jobber length, ANSI/ASME B94.11M sizing — standard fractional jobber geometry: a familiar length and balance for hand drills and drill presses alike, easy to cross-reference against any existing size chart.

Stepped-tip point. Ground as a series of fine concentric steps: each step takes a small cut, so the bit locates and enters progressively instead of grabbing thin or curved material.

Three flat shank. Three ground flats at 120° give the chuck jaws flat faces to grip, so the shank resists slipping as the load rises.

Black & gold finish. Gold-tone coated flutes for hardness and heat resistance; black-oxide shank for corrosion protection — and a two-tone surface that shows wear clearly.

Specification

Size List

1 inch = 25.4 mm. “≈ mm” is a conversion for size selection only, not a machining tolerance. All sizes are jobber length per ANSI/ASME B94.11M.

Features Explained

Materials & Applications

Target buyers: hardware wholesalers / industrial MRO distributors / electrical and plumbing contractors / private-label tool brands / DIY retail chains.

How to Use

• Check your drill chuck capacity against the bit diameter before use, and make sure the shank is fully seated in the jaws.
• Clamp the workpiece. Small bits still need a firm, stable setup.
• Start at low speed and let the stepped point locate the hole; apply pressure only once the point has bitten.
• Use cutting fluid or a suitable lubricant on metal, and clear chips regularly.
• Reduce speed as the diameter increases; work up through the sizes in the set rather than jumping to the final diameter.

Packaging & Shipping

OEM / ODM Customization

• Brand customization: laser marking (logo + size) on the shank
• Print customization: storage case, label sticker, instruction sheet
• Colour customization: finish options and case colours
• Size customization: build to the buyer’s size list (add or remove diameters, change the increment)
• Material customization: M2 / M35 / M42 body, or mixed sets by application
• MOQ: on request (to be confirmed by customization type)

FAQ