Drill Bits

The range is specifically designed to cover the tapping drill sizes and clearance hole sizes for the range of taps list.
The use of the correct drill size is crucial to successful tapping and tap life and some of the sizes below are difficult to obtain on the high street.

The tap drill sizes quoted as standard ('Std') are the tap manufacturers recommended size for full thread engagement.
For many hobby and non-critical applications, a larger size tap drill can be used to give less thread engagement
but reduced the risk of tap breakage - this may be preferable when tapping the smaller size threads, particularly if you are new to thread tapping.
These drills are listed as Increased clearance ('Inc Clearance') and will result in approximately 65% thread engagement

Please note that though we try to keep the data below up to date, lengths of drill bits occasionally vary.
If the length is critical, please e mail us for confirmation.

HSS Drill Bits
Dia (mm)	Length (mm)	Usage	MF Ref	Price Each

0.5	34	Pilot drill	MF-DB-005	£1.74

1.0	34	Pilot drill	MF-DB-010	£1.74

1.05	34	Tap drill for 12BA	MF-DB-105	£3.05

1.1	34	Pilot drill	MF-DB-011	£1.80

1.2	38	Pilot drill	MF-DB-012	£1.80

1.3	38	Pilot drill	MF-DB-013	£1.74

1.4	38	Tap drill for 10BA	MF-DB-014	£1.56

1.5	40	Pilot drill	MF-DB-015	£1.32

1.6	43	Std Tap drill for M2	MF-DB-016	£1.32

1.7	46	Inc Clearance Tap drill for M2	MF-DB-017	£1.56

1.8	46	Std Tap drill for 8BA	MF-DB-018	£1.50
1.8	46	Std Tap drill for 2UNC	MF-DB-018	£1.50

1.9	46	Pilot drill	MF-DB-019	£1.56

2.0	49	Clearance drill for M1.6 and 10BA	MF-DB-020	£1.20

2.05	49	Std Tap Drill for M2.5	MF-DB-205	£1.62

2.1	49	Close clearance for M2	MF-DB-021	£1.44

2.2	49	Inc Clearance Tap drill for M2.5	MF-DB-022	£1.44

2.3	49	Std Tap Drill for 6BA	MF-DB-023	£1.44
2.3	49	Std Tap Drill for No 4 UNC	MF-DB-023	£1.44

2.4	49	Std Tap Drill for No 4 UNF	MF-DB-024	£1.44

2.5	57	Clearance drill for M2 & 8BA	MF-DB-025	£1.20
2.5	57	Std Tap Drill for M3	MF-DB-025	£1.20

2.55	57	Std Tap Drill for No 1/8" BSW	MF-DB-255	£1.44

2.6	57	Close clearance for M2.5	MF-DB-026	£1.44

2.65	57	Inc Clearance Tap drill for M3	MF-DB-265	£2.20
		Std Tap Drill for No 5 UNC
		Std Tap Drill for No 5 BA

2.7	57	Clearance for M2.5	MF-DB-027	£1.44

2.8	61	Std Tap Drill for No 6 UNC	MF-DB-028	£1.44

2.9	61	Std Tap Drill for M3.5	MF-DB-029	£1.26

3.0	61	Clearance drill for M2.5	MF-DB-030	£1.20
		Std Tap Drill for 4BA
		Std Tap Drill for 6UNF

3.1	61	Close clearance for M2.5	MF-DB-031	£1.20

3.2	61	Std Tap Drill for 5/32" BSW	MF-DB-032	£1.20

3.3	65	Clearance drill for 6BA	MF-DB-033	£1.32
3.3	65	Std Tap Drill for M4	MF-DB-033	£1.32

3.4	65	Std Tap Drill for 3BA	MF-DB-034	£1.62

3.5	70	Clearance drill for M3.0	MF-DB-035	£1.32
		Inc Clearance Tap Drill for M4
		Std Tap drill for 8 UNF & 8UNC

3.6	70	Close clearance for M3.5	MF-DB-036	£1.32

3.7	70	Std Tap Drill for 3/16" BSW	MF-DB-037	£1.44

3.8	70		MF-DB-038	£1.74

3.9	70	Std Tap Drill for No 10 UNC	MF-DB-039	£1.74

4.0	75	Clearance drill for M3.5 & 4BA	MF-DB-040	£1.50
		Std Tap Drill for 2BA
		Std Tap Drill for 3/16 BSF

4.1	75	Tap Drill for 10 UNF	MF-DB-041	£1.56

4.2	75	Std Tap Drill for M5	MF-DB-042	£1.56

4.3	75		MF-DB-043	£1.56

4.4	75		MF-DB-044	£1.56

4.5	80	Clearance drill for M4	MF-DB-045	£1.68
		Inc Clearance Tap Drill for M5
		Std Tap Drill for 12UNC
		Std Tap Drill for 1 BA

5.0	86	Std Tap Drill for M6	MF-DB-050	£1.92

5.1	86	Std Tap Drill for 1/4" UNC	MF-DB-051	£2.35
5.1	86	Std Tap Drill for 1/4" BSW	MF-DB-051	£2.35

5.25	86	Std Tap Drill for M6 x0.75 fine	MF-DB-525	£3.78

5.3	86	Inc Clearance Tap Drill for M6	MF-DB-053	£2.50
5.3	86	Std Tap Drill for 1/4" BSF	MF-DB-053	£2.50

5.5	93	Clearance drill for M5 & 2BA	MF-DB-055	£2.60
		Tap drill for Glow Plug (1/4"x32)
		Tap drill for 1/4" UNF

5.8	101	5.8mm drill bit	MF-DB-058	£2.90

6.0	101	6mm drill bit	MF-DB-060	£2.45

6.5	101	Clearance drill for M6	MF-DB-065	£2.75

6.6	101	Tap drill for 5/16" UNC	MF-DB-066	£3.55

6.8	101	Tap drill for 5/16" BSF & M8x1.25 (coarse pitch)	MF-DB-068	£3.00

6.9	101	Tap drill for 5/16" UNF	MF-DB-069	£3.55

Send mail to webmaster@modelfixings.com with questions or comments about this web site. General & Sales Information: info@modelfixings.com

Send mail to webmaster@modelfixings.com with questions or comments about this web site.
General & Sales Information: info@modelfixings.com