Center drill bits are used to drill accurate center holes prior to turning. They are also used as a starter bit to make accurate holes in stock. These bits are self-centering and match lathe centers. Center bits are usually made of HSS and have a two-part tip with a small pilot and the larger countersinking area. Read our review to choose the best tool for your needs.
1, 2, 3, 4 and 5, 60° tip angles
|Top Quality center bits, M2 HSS
Drill accurate center holes in material prior to turning, or use as a starter bit for accurate holes
Cutting diameter of the bits:
UGS = US Gauge number size
No. = Engraved number on bit
CN = Closest neighbor
Dia. = Cutting diameter of bit (min/max diam. each end)
OAL = Overall length
Shank = Shank diameter
Drills individually packaged in plastic end mill sleeves and then heat sealed into one pouch. Well ground drills and a value in price. The drills work excellent, nice and sharp. Work fine for steel, aluminum, and other soft materials. Hardened and stainless still are too tough for them.
|This set entirely complies with USAS B94.11-1967 “USA Standard Combined Drills and Countersinks, Plain and Bell Types” by listing #1 as 1/8″ and #5 as 7/16″.
Size #1 Drill Point Dia. and Lg. : 3/64″ = .047″ = 1.191 mm
Body (Shank) Dia. : 1/8″ = .125″ = 3.175 mm
OAL : 1-1/4″ = 1.250″ = 31.750 mm
Size #2 Drill Point Dia. and Lg. : 5/64″ = .078″ = 1.984 mm
Body (Shank) Dia. : 3/16″ = .188″ = 4.763 mm
OAL : 1-7/8″ = 2.125″ = 53.975 mm
Size #3 Drill Point Dia. and Lg. : 7/64″ = .109″ = 2.778 mm
Body (Shank) Dia. : 1/4″ = .250″ = 6.35 mm
OAL : 2″ = 2.000″ = 50.80 mm
Size #4 Drill Point Dia. and Lg. : 1/8″ = .125″ = 3.175 mm
Body (Shank) Dia. : 5/16″ = 0.313″ = 7.938 mm
OAL : 2-1/8″ = 2.625″ = 66.675 mm
Size #5 Drill Point Dia. and Lg. : 3/16″ = .188″ = 4.763 mm
Body (Shank) Dia. : 7/16″ = .438″ = 11.113 mm
OAL : 2-3/4″ = 5.750″ = 146.050 mm
A great center drill set for the casual machinist.
#1 Body Diameter 1/8″ Drill Diameter 3/64″ Overall Length 1-1/2″ 2x #2 Body Diameter 3/16″ Drill Diameter 3/16″ Overall Length 1-7/8″two Size #3 Body Diameter 1/4″ Drill Diameter 7/64″ Overall Length 2″ one #4 Body Diameter 5/16″ Drill Diameter 1/8″ Overall Length 2-1/8″Set of six.
|These HSS double-ended, 60 degree Center Drills are precision-ground. Used for producing center holds in components or work pieces with require machining between centers.
Good quality center bits, function well. These are pretty basic, no problems so far. No burrs or milling issues.
Size 1: Body Dia. 1/8″, Drill Dia. 3/64″, O.A. Length 1-1/4″Size 2: Body Dia. 3/16″, Drill Dia. 5/64″, O.A. Length 1-7/8″
Size 3: Body Dia. 1/4″, Drill Dia. 7/64″, O.A. Length 2″
|Double-ended HSS Center bits, precision grounded. These are HSS and come with a good edge, better don’t use them on hard steel. Don’t hold an edge terribly long. For home or hobbyist use, they work just fine. If you are a professional buy something else.|
Tip angles: 60°
1/8″ 3/16″ 1/4″ 5/16″ 3/8″
|Plain style 60° angle used for producing center holes in workpieces which require precision drilling or machining between centers.
It also used for making starter holes to prevent a drill bit from “walking”.
Center and spotting drills are traditionally used to make a conical hole for a lathe center in order to make a starting point for a standard twist drill, designed to prevent the twist drill from walking.
The set is OK but not great. For mild steel and wood they would work great.