Center drill bits in DIN 333 metric, 1 to 8mm, and ANSI/ASME B94.11 imperial, #0 to #8 and #11 to #18, all 60 degree. Centre drills in UK and European usage — same tool. Type A is the plain form: drill point, countersink, nothing else. Type B adds a protecting chamfer over the countersink, which stops the center hole getting dinged in handling; it carries the larger body and countersink, for deeper center holes, for pre-positioning a larger drill, and where the work needs more support. Imperial sizes go by the number series rather than by diameter. Combined drill and countersink, so one pass leaves a hole a lathe center can sit in. HSS as standard, HSS-E and carbide to order; dimensions are in the size chart below.
| Cart+ | SKU | Price | Quantity | Total | Body Diameter D | Drill Diameter d | Drill Length l | Total Length L | Drill Diameter d1 | FIG |
|---|---|---|---|---|---|---|---|---|---|---|
A-HSS-1 | $2 | $0 | 3.15 mm | 1 mm | 1.3 mm | 31.5 mm | - | Fig.1 | ||
A-HSS-1.25 | $2.5 | $0 | 3.15 mm | 1.25 mm | 1.6 mm | 31.5 mm | - | Fig.1 | ||
A-HSS-1.6 | $2.5 | $0 | 4 mm | 1.6 mm | 2 mm | 35.5 mm | - | Fig.1 | ||
A-HSS-2 | $3 | $0 | 5 mm | 2 mm | 2.5 mm | 40 mm | - | Fig.1 | ||
A-HSS-2.5 | $3 | $0 | 6.3 mm | 2.5 mm | 3.1 mm | 45 mm | - | Fig.1 | ||
A-HSS-3.15 | $3.5 | $0 | 8 mm | 3.15 mm | 3.9 mm | 50 mm | - | Fig.1 | ||
A-HSS-4 | $4 | $0 | 10 mm | 4 mm | 5 mm | 56 mm | - | Fig.1 | ||
A-HSS-5 | $4 | $0 | 12.5 mm | 5 mm | 6.3 mm | 63 mm | - | Fig.1 | ||
A-HSS-6.3 | $4.5 | $0 | 16 mm | 6.3 mm | 8 mm | 71 mm | - | Fig.1 | ||
A-HSS-8 | $5 | $0 | 20 mm | 8 mm | 10 mm | 80 mm | - | Fig.1 | ||
B-HSS-1 | $2 | $0 | 4 mm | 1 mm | 1.3 mm | 35.5 mm | 2.12 mm | Fig.2 | ||
B-HSS-1.25 | $2.5 | $0 | 5 mm | 1.25 mm | 1.6 mm | 40 mm | 2.65 mm | Fig.2 | ||
B-HSS-1.6 | $2.5 | $0 | 6.3 mm | 1.6 mm | 2 mm | 45 mm | 3.35 mm | Fig.2 | ||
B-HSS-2 | $3 | $0 | 8 mm | 2 mm | 2.5 mm | 50 mm | 4.25 mm | Fig.2 | ||
B-HSS-2.5 | $3 | $0 | 10 mm | 2.5 mm | 3.1 mm | 56 mm | 5.3 mm | Fig.2 | ||
B-HSS-3.15 | $3.5 | $0 | 11.2 mm | 3.15 mm | 3.9 mm | 60 mm | 6.7 mm | Fig.2 | ||
B-HSS-4 | $4 | $0 | 14 mm | 4 mm | 5 mm | 67 mm | 8.5 mm | Fig.2 | ||
B-HSS-5 | $4 | $0 | 18 mm | 5 mm | 6.3 mm | 75 mm | 10.6 mm | Fig.2 | ||
B-HSS-6.3 | $4.5 | $0 | 20 mm | 6.3 mm | 8 mm | 80 mm | 13.2 mm | Fig.2 | ||
B-HSS-8 | $5 | $0 | 25 mm | 8 mm | 10.1 mm | 100 mm | 17 mm | Fig.2 | ||
A-HSS-0I | $2 | $0 | 1/8″ | 1/32″ | 0.038″ | 1-1/8″ | - | Fig.1 | ||
A-HSS-1I | $2.5 | $0 | 1/8″ | 3/64″ | 3/64″ | 1-1/4″ | - | Fig.1 | ||
A-HSS-2I | $2.5 | $0 | 3/16″ | 5/64″ | 5/64″ | 1-7/8″ | - | Fig.1 | ||
A-HSS-3I | $3 | $0 | 1/4″ | 7/64″ | 7/64″ | 2″ | - | Fig.1 | ||
A-HSS-4I | $3.5 | $0 | 5/16″ | 1/8″ | 1/8″ | 2-1/8″ | - | Fig.1 | ||
A-HSS-5I | $4 | $0 | 7/16″ | 3/16″ | 3/16″ | 2-3/4″ | - | Fig.1 | ||
A-HSS-6I | $4 | $0 | 1/2″ | 7/32″ | 7/32″ | 3″ | - | Fig.1 | ||
A-HSS-7I | $4.5 | $0 | 5/8″ | 1/4″ | 1/4″ | 3-1/4″ | - | Fig.1 | ||
A-HSS-8I | $5 | $0 | 3/4″ | 5/16″ | 5/16″ | 3-1/2″ | - | Fig.1 | ||
B-HSS-11I | $2 | $0 | 1/8″ | 3/64″ | 0.10″ | 1-1/4″ | 0.1″ | Fig.2 | ||
B-HSS-12I | $2.5 | $0 | 3/16″ | 1/16″ | 0.15″ | 1-7/8″ | 0.15″ | Fig.2 | ||
B-HSS-13I | $3 | $0 | 1/4″ | 3/32″ | 0.20″ | 2″ | 0.20″ | Fig.2 | ||
B-HSS-14I | $3.5 | $0 | 5/16″ | 7/64″ | 0.25″ | 2-1/8″ | 0.25″ | Fig.2 | ||
B-HSS-15I | $4 | $0 | 7/16″ | 5/32″ | 0.35″ | 2-3/4″ | 0.35″ | Fig.2 | ||
B-HSS-16I | $4 | $0 | 1/2″ | 7/32″ | 0.50″ | 3″ | 0.4″ | Fig.2 | ||
B-HSS-17I | $4.5 | $0 | 5/8″ | 7/32″ | 0.50″ | 3-1/4″ | 0.5″ | Fig.2 | ||
B-HSS-18I | $5 | $0 | 3/4″ | 1/4″ | 0.60″ | 3-1/2″ | 0.6″ | Fig.2 |
DIN 333 metric and ANSI/ASME B94.11 imperial
60 degree countersink on every size
Type A: plain drill and countersink, light to medium work
Type B: adds a protecting chamfer, heavy-duty work
Metric drill points 1 to 8mm, ten sizes per type
Imperial number series, #0 to #8 and #11 to #18
HSS as standard, HSS-E and carbide made to order
Size is called out by drill point diameter d
For lathe centering and pilot holes before drilling
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