Best Bosch Mechanics Length Drill Bits in 2026

Daisy
Last Updated: Jul 18, 2026

At a Glance: Our Top Picks for Bosch Mechanics Length Drill Bits

BOSCH BL2634 7/64 In. x 6 In. Aircraft Fractional Black Oxide Drill Bit
#TOP1
Bosch Bl2634 7/64 In. X 6 In. Aircraft
9.8
PM SCORE
BOSCH CO2139B 3/16 In. x 3-1/2 In. Cobalt M42 Drill Bit
#TOP2
Bosch Co2139B 3/16 In. X 3-1/2 In. Cobalt
9.8
PM SCORE
BOSCH BL2635 1/8 In. x 6 In. Extra Length Aircraft Black Oxide Drill Bit
#TOP3
Bosch Bl2635 1/8 In. X 6 In. Extra
9.7
PM SCORE

* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.

Summary of the Best Bosch Mechanics Length Drill Bits of 2026

Market Overview
Bosch Mechanics Length Drill Bits Reviewed
  • Reviews Analyzed: 6333 Items
  • PM Avg. Rating: 9.7 / 10
7 Products Evaluated
  • Highest Price: $14.99
  • Lowest Price: $2.19
  • Avg. Price: $6.23

Bosch Bl2634 7/64 In. X 6 In. Aircraft Fractional Black Oxide Drill Bit

BOSCH
BL2634
3.50 X 0.71 X 0.06 Inches
0.07 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Speed helix design for three times faster drilling than standard bits

Last 50 percent longer than high-speed steel

Easier drilling, reduced heat and extended drill bit life

Available in jobber length, stubby length, extended length (aircraft), 1/2 In. reduced shank (Silver Deming)

For use in steel, copper, aluminum, brass, oak, maple, MDF, pine, PVC, polycarbonate, acrylic, ABS, nylon and composite materials

Bosch Co2139B 3/16 In. X 3-1/2 In. Cobalt M42 Drill Bit

BOSCH
CO2139B
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Cobalt M42 drill bit – provides upgraded M42 Cobalt jobber-length bits designed for durability, high heat resistance and Hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum

Enhanced M42 alloy material – contains 8% Cobalt alloy that delivers 10x life vs. Standard bits

High-heat resistant bits – withstand high-temperature applications for extended periods of time

Thick web-helix design – provides additional stability in tough applications

Surface-hardened tip – penetrates tough abrasive materials

Bosch Bl2635 1/8 In. X 6 In. Extra Length Aircraft Black Oxide Drill Bit

BOSCH
BL2635
3.54 X 0.75 X 0.05 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Speed helix design for three times faster drilling than standard bits

Last 50 percent longer than high-speed steel

Easier drilling, reduced heat and extended drill bit life

Available in jobber length, stubby length, extended length (aircraft), 1/2 In. reduced shank (Silver and Deming)

For use in steel, copper, aluminum, brass, oak, maple, MDF, pine, PVC, polycarbonate, acrylic, ABS, nylon and composite materials

Bosch Co2139 3/16 In. X 3-1/2 In. Cobalt Drill Bit

BOSCH
CO2139
5.90 X 1.80 X 0.21 Inches
0.03 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Withstands high-temperature applications for extended periods of time (up to 1,100 degreeF)

Rigid, thick web design adds stability to bit in tough applications

Surface hardened to penetrate tough abrasive materials

Available in jobber length, full shank

Best used for drilling into light-gauge metal, high-carbon steel, aluminum and ally steel, cast iron, stainless steel and titanium

Bosch Bl2759 1/2 In. X 12 In. Extra Length Aircraft Black Oxide Drill Bit

BOSCH
BL2759
0.00 X 0.00 X 0.00 Inches
0.57 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Speed helix design for three times faster drilling than standard bits

Last 50 percent longer than high-speed steel

Easier drilling, reduced heat and extended drill bit life

Available in jobber length, stubby length, extended length (aircraft), 1/2 In. reduced shank (Silver Deming)

For use in steel, copper, aluminum, brass, oak, maple, MDF, pine, PVC, polycarbonate, acrylic, ABS, nylon and composite materials

Bosch Bl2751 3/8 In. X 12 In. Extra Length Aircraft Black Oxide Drill Bit

BOSCH
BL2751
0.00 X 0.00 X 0.00 Inches
0.35 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Speed helix design for three times faster drilling than standard bits

Last 50 percent longer than high-speed steel

Easier drilling, reduced heat and extended drill bit life

Available in jobber length, stubby length, extended length (aircraft), 1/2 In. reduced shank (Silver and Deming)

For use in steel, copper, aluminum, brass, oak, maple, MDF, pine, PVC, polycarbonate, acrylic, ABS, nylon and composite materials

Bosch Bl2731 1/16 In. X 12 In. Extra Length Aircraft Black Oxide Drill Bit

BOSCH
BL2731
0.00 X 0.00 X 0.00 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Speed helix design for three times faster drilling than standard bits

Last 50 percent longer than high-speed steel

Easier drilling, reduced heat and extended drill bit life

Available in jobber length, stubby length, extended length (aircraft), 1/2 In. reduced shank (Silver and Deming)

For use in steel, copper, aluminum, brass, oak, maple, MDF, pine, PVC, polycarbonate, acrylic, ABS, nylon and composite materials

Top 10 mechanics length drill bits Brands on Amazon

Here is the list of top-rated brands that were evaluated by PM.

Brand Count
Bosch 7

Top 10 mechanics length drill bits Brands Pie Chart


We've carried out a comprehensive analysis of 6,333 reviews on mechanics length drill bits, using our selection criteria to identify the best options in the home improvement. Our findings reveal that most customers typically select mechanics length drill bits priced around $6.23, with top brands including cle-line, champion cutting tool corp, viking drill & tool, astro pneumatic tool, knkut, consolidated toledo drill, drill america, norseman ctd and alfa tools and chicago latrobe

Our team of expert editors reviewed these high-quality items and handpicked the top 7 mechanics length drill bits for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the home improvement category. These include amazon.com, mechanixgear, tooldom tools, crimp supply inc, raw products corp, usa tool depot, discount shop tools, dataalchemy and sim supply, inc. and highfire .

We are dedicated to assisting our users in finding the right bits Products based on their needs, saving them considerable time when choosing which mechanics length drill bits to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.