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Zoro Tools has a simple mission—
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We do this by offering more than 400,000 great products at super low prices. Small businesses have historically been at a disadvantage to larger companies who can buy stuff at lower prices because of their size. We want to change that!

Zoro Tools has most of the products that the “big guys” have and we offer every single one of them at an everyday low price. There are no complex discount structures to understand and no hidden costs. Every customer pays the same low price for an item—whether you want to buy one or one thousand!

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Jobber Length Cobalt Bit List #550 Fractional

CHICAGO-LATROBE
Jobber Length Drill Bits
Description : List Number : 550, Drill Point (Deg.) : 135, Meets/Exceeds : National Aerospace Standards (NAS) 907, Type J, Grade : Heavy Duty, Type : Aircraft, Number of Pieces : 1, Material : Cobalt Steel, Item : Jobber Drill, Finish : Straw, Application : For Alloy, Stainless And Tool Steels And Titanium
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Flute Length (In.) Decimal Equivalent Shank Dia. (mm) Point Type Shank Dia. (In.) Overall Length (In.) Fractional Size (In.) Mfr.# ZoroItem# Price Qty.
2-15/16 0.2812 - Split Point 9/32 4-1/4 9/32 46618 G3092302 $5.37/EA
4-3/16 0.4531 11.509375 Split Point 29/64 5-5/8 29/64 46629 G1736165 $15.13/EA
3-5/8 0.3750 - Split Point 3/8 5 3/8 46624 G0368566 $8.09/EA
3-15/16 0.4219 10.715625000000001 Split Point 27/64 5-3/8 27/64 46627 G0936747 $12.47/EA
3-1/2 0.3594 9.128125 Split Point 23/64 4-7/8 23/64 46623 G2133713 $9.22/EA
2-7/8 0.2656 6.746875 Split Point 17/64 4-1/8 17/64 46617 G0840481 $3.99/EA
4-3/8 0.4844 - Split Point 31/64 5-7/8 31/64 46631 G3038287 $16.60/EA
3/16 0.0156 0.39687500000000003 Conventional Point 1/64 3/4 1/64 46601 G2627572 $3.57/EA
4-1/2 0.5000 12.70 Split Point 1/2 6 1/2 46632 G0599681 $17.46/EA
3-3/16 0.3125 - Split Point 5/16 4-1/2 5/16 46620 G0301086 $5.19/EA
3-5/16 0.3281 8.334375 Split Point 21/64 4-5/8 21/64 46621 G2305974 $7.54/EA
3-7/16 0.3438 8.731250000000001 Split Point 11/32 4-3/4 11/32 46622 G1926303 $8.16/EA
3-1/16 0.2969 7.540625 Split Point 19/64 4-3/8 19/64 46619 G1658921 $6.25/EA
4-5/16 0.4688 11.90625 Split Point 15/32 5-3/4 15/32 46630 G0292241 $15.64/EA
4-1/16 0.4375 - Split Point 7/16 5-1/2 7/16 46628 G0985582 $13.29/EA
3/4 0.0469 1.190625 Conventional Point 3/64 1-3/4 3/64 46603 G3172985 $1.77/EA
3-7/8 0.4062 10.31875 Split Point 13/32 5-1/4 13/32 46626 G0663354 $11.41/EA
3-3/4 0.3906 9.921875 Split Point 25/64 5-1/8 25/64 46625 G3103852 $10.86/EA
Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46618, Z#: G3092302

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 9/32, Decimal Equivalent 0.2812, Flute Length (In.) 2-15/16, Flute Length (mm) -, Overall Length (In.) 4-1/4, Overall Length (mm) -, Shank Dia. (In.) 9/32, Shank Dia. (mm) -, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46629, Z#: G1736165

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 29/64, Decimal Equivalent 0.4531, Flute Length (In.) 4-3/16, Flute Length (mm) -, Overall Length (In.) 5-5/8, Overall Length (mm) -, Shank Dia. (In.) 29/64, Shank Dia. (mm) 11.509375, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46624, Z#: G0368566

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 3/8, Decimal Equivalent 0.3750, Flute Length (In.) 3-5/8, Flute Length (mm) -, Overall Length (In.) 5, Overall Length (mm) -, Shank Dia. (In.) 3/8, Shank Dia. (mm) -, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46627, Z#: G0936747

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 27/64, Decimal Equivalent 0.4219, Flute Length (In.) 3-15/16, Flute Length (mm) -, Overall Length (In.) 5-3/8, Overall Length (mm) -, Shank Dia. (In.) 27/64, Shank Dia. (mm) 10.715625000000001, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46623, Z#: G2133713

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 23/64, Decimal Equivalent 0.3594, Flute Length (In.) 3-1/2, Flute Length (mm) -, Overall Length (In.) 4-7/8, Overall Length (mm) -, Shank Dia. (In.) 23/64, Shank Dia. (mm) 9.128125, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46617, Z#: G0840481

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 17/64, Decimal Equivalent 0.2656, Flute Length (In.) 2-7/8, Flute Length (mm) -, Overall Length (In.) 4-1/8, Overall Length (mm) -, Shank Dia. (In.) 17/64, Shank Dia. (mm) 6.746875, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46631, Z#: G3038287

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 31/64, Decimal Equivalent 0.4844, Flute Length (In.) 4-3/8, Flute Length (mm) -, Overall Length (In.) 5-7/8, Overall Length (mm) -, Shank Dia. (In.) 31/64, Shank Dia. (mm) -, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46601, Z#: G2627572

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Conventional Point, Drill Point (Deg.) 135, Fractional Size (In.) 1/64, Decimal Equivalent 0.0156, Flute Length (In.) 3/16, Flute Length (mm) -, Overall Length (In.) 3/4, Overall Length (mm) -, Shank Dia. (In.) 1/64, Shank Dia. (mm) 0.39687500000000003, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46632, Z#: G0599681

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 1/2, Decimal Equivalent 0.5000, Flute Length (In.) 4-1/2, Flute Length (mm) -, Overall Length (In.) 6, Overall Length (mm) -, Shank Dia. (In.) 1/2, Shank Dia. (mm) 12.70, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46620, Z#: G0301086

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 5/16, Decimal Equivalent 0.3125, Flute Length (In.) 3-3/16, Flute Length (mm) -, Overall Length (In.) 4-1/2, Overall Length (mm) -, Shank Dia. (In.) 5/16, Shank Dia. (mm) -, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46621, Z#: G2305974

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 21/64, Decimal Equivalent 0.3281, Flute Length (In.) 3-5/16, Flute Length (mm) -, Overall Length (In.) 4-5/8, Overall Length (mm) -, Shank Dia. (In.) 21/64, Shank Dia. (mm) 8.334375, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46622, Z#: G1926303

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 11/32, Decimal Equivalent 0.3438, Flute Length (In.) 3-7/16, Flute Length (mm) -, Overall Length (In.) 4-3/4, Overall Length (mm) -, Shank Dia. (In.) 11/32, Shank Dia. (mm) 8.731250000000001, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46619, Z#: G1658921

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 19/64, Decimal Equivalent 0.2969, Flute Length (In.) 3-1/16, Flute Length (mm) -, Overall Length (In.) 4-3/8, Overall Length (mm) -, Shank Dia. (In.) 19/64, Shank Dia. (mm) 7.540625, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46630, Z#: G0292241

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 15/32, Decimal Equivalent 0.4688, Flute Length (In.) 4-5/16, Flute Length (mm) -, Overall Length (In.) 5-3/4, Overall Length (mm) -, Shank Dia. (In.) 15/32, Shank Dia. (mm) 11.90625, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46628, Z#: G0985582

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 7/16, Decimal Equivalent 0.4375, Flute Length (In.) 4-1/16, Flute Length (mm) -, Overall Length (In.) 5-1/2, Overall Length (mm) -, Shank Dia. (In.) 7/16, Shank Dia. (mm) -, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46603, Z#: G3172985

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Conventional Point, Drill Point (Deg.) 135, Fractional Size (In.) 3/64, Decimal Equivalent 0.0469, Flute Length (In.) 3/4, Flute Length (mm) -, Overall Length (In.) 1-3/4, Overall Length (mm) -, Shank Dia. (In.) 3/64, Shank Dia. (mm) 1.190625, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46626, Z#: G0663354

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 13/32, Decimal Equivalent 0.4062, Flute Length (In.) 3-7/8, Flute Length (mm) -, Overall Length (In.) 5-1/4, Overall Length (mm) -, Shank Dia. (In.) 13/32, Shank Dia. (mm) 10.31875, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -

Product Details

Jobber Length Cobalt Bit List #550 Fractional

Brand: CHICAGO-LATROBE
Mfr#: 46625, Z#: G3103852

Product Description: Jobber Drill, Aircraft, List Number 550, Number of Pieces 1, Heavy Duty Grade, Cobalt Steel, Straw Finish, Split Point, Drill Point (Deg.) 135, Fractional Size (In.) 25/64, Decimal Equivalent 0.3906, Flute Length (In.) 3-3/4, Flute Length (mm) -, Overall Length (In.) 5-1/8, Overall Length (mm) -, Shank Dia. (In.) 25/64, Shank Dia. (mm) 9.921875, For Alloy, Stainless And Tool Steels And Titanium, Meets/Exceeds National Aerospace Standards (NAS) 907, Type J, Sizes Included -