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AYSNACOSDHSS-CO Straight Shank Drill 6520 COSDSold0pcsNACHI 6520 COSD is the cobalt (HSS-CO) straight shank drill, with the cobalt there for stainless. Cobalt in the substrate raises red hardness so it lasts longer in stainless than plain 500 SD; the next step up is a coated drill such as 6594P AGSUSR or the SG series. It is made from cobalt high speed steel (HSS-CO), uncoated. Sizes cover diameter 0.5~13mm, flute length 5~80mm, overall length 27~152mm, 126 in total, made in Japan. Cobalt or TiN? Cobalt changes the substrate and survives regrinding; a coating is a surface layer that is lost once ground away. For stainless, cobalt. It suits carbon and alloy steel, stainless steel, copper, aluminium and other non-ferrous metals with workpiece hardness up to HRC40. Typical uses: drilling stainless steel and SUS plate, and jobs where a plain drill burns up. The family also includes the baseline 500 SD (diameter 0.2~17.5mm, rated to HRC30) and the TiN coated 520P GSD (also HRC30); for both a coating and cobalt, 6568P GSS (stub) and 6550P GLSD (long) are each rated to HRC40.

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HSS-CO Straight Shank Drill 6520 COSD

NACHI 6520 COSD is the cobalt (HSS-CO) straight shank drill, with the cobalt there for stainless.

Specifications (126 items)

Dia.

Flute length

Overall length

Depth ratio (×D)

Point angle

0.5~1.9

5~17.5

27~52

9.17~10.83

135

Expand this group (15 specs)

Part No.	Dia.	Flute length	Overall length
AYSNACOSD0.5	0.5	5	27
AYSNACOSD0.6	0.6	5.5	30
AYSNACOSD0.7	0.7	7.5	32
AYSNACOSD0.8	0.8	8	34
AYSNACOSD0.9	0.9	9	36
AYSNACOSD1.0	1	10	40
AYSNACOSD1.1	1.1	11	42
AYSNACOSD1.2	1.2	13	42
AYSNACOSD1.3	1.3	13	45
AYSNACOSD1.4	1.4	14.5	48
AYSNACOSD1.5	1.5	14.5	48
AYSNACOSD1.6	1.6	16	50
AYSNACOSD1.7	1.7	16	50
AYSNACOSD1.8	1.8	17.5	52
AYSNACOSD1.9	1.9	17.5	52

2~3.9

20~36

55~79

8.82~10.45

135

Expand this group (20 specs)

Part No.	Dia.	Flute length	Overall length
AYSNACOSD2.0	2	20	55
AYSNACOSD2.1	2.1	20	55
AYSNACOSD2.2	2.2	23	58
AYSNACOSD2.3	2.3	23	58
AYSNACOSD2.4	2.4	24.5	61
AYSNACOSD2.5	2.5	24.5	61
AYSNACOSD2.6	2.6	26	64
AYSNACOSD2.7	2.7	26	64
AYSNACOSD2.8	2.8	27	67
AYSNACOSD2.9	2.9	29.5	71
AYSNACOSD3.0	3	29.5	71
AYSNACOSD3.1	3.1	29.5	71
AYSNACOSD3.2	3.2	29.5	71
AYSNACOSD3.3	3.3	31.5	73
AYSNACOSD3.4	3.4	31.5	73
AYSNACOSD3.5	3.5	31.5	73
AYSNACOSD3.6	3.6	33.5	76
AYSNACOSD3.7	3.7	33.5	76
AYSNACOSD3.8	3.8	33.5	76
AYSNACOSD3.9	3.9	36	79

4~5.9

38~47

83~98

7.97~9.5

135

Expand this group (20 specs)

Part No.	Dia.	Flute length	Overall length
AYSNACOSD4.0	4	38	83
AYSNACOSD4.1	4.1	38	83
AYSNACOSD4.2	4.2	38	83
AYSNACOSD4.3	4.3	38	83
AYSNACOSD4.4	4.4	39	86
AYSNACOSD4.5	4.5	39	86
AYSNACOSD4.6	4.6	39	86
AYSNACOSD4.7	4.7	41	89
AYSNACOSD4.8	4.8	41	89
AYSNACOSD4.9	4.9	43	92
AYSNACOSD5.0	5	43	92
AYSNACOSD5.1	5.1	43	92
AYSNACOSD5.2	5.2	45	95
AYSNACOSD5.3	5.3	45	95
AYSNACOSD5.4	5.4	45	95
AYSNACOSD5.5	5.5	45	95
AYSNACOSD5.6	5.6	47	98
AYSNACOSD5.7	5.7	47	98
AYSNACOSD5.8	5.8	47	98
AYSNACOSD5.9	5.9	47	98

6~7.9

49~57

102~114

7.22~8.17

135

Expand this group (20 specs)

Part No.	Dia.	Flute length	Overall length
AYSNACOSD6.0	6	49	102
AYSNACOSD6.1	6.1	49	102
AYSNACOSD6.2	6.2	49	102
AYSNACOSD6.3	6.3	49	102
AYSNACOSD6.4	6.4	51	105
AYSNACOSD6.5	6.5	51	105
AYSNACOSD6.6	6.6	51	105
AYSNACOSD6.7	6.7	51	105
AYSNACOSD6.8	6.8	51	105
AYSNACOSD6.9	6.9	51	105
AYSNACOSD7.0	7	51	105
AYSNACOSD7.1	7.1	53	108
AYSNACOSD7.2	7.2	53	108
AYSNACOSD7.3	7.3	53	108
AYSNACOSD7.4	7.4	55	111
AYSNACOSD7.5	7.5	55	111
AYSNACOSD7.6	7.6	55	111
AYSNACOSD7.7	7.7	57	114
AYSNACOSD7.8	7.8	57	114
AYSNACOSD7.9	7.9	57	114

8~9.9

57~67

114~130

6.77~7.28

135

Expand this group (20 specs)

Part No.	Dia.	Flute length	Overall length
AYSNACOSD8.0	8	57	114
AYSNACOSD8.1	8.1	59	117
AYSNACOSD8.2	8.2	59	117
AYSNACOSD8.3	8.3	59	117
AYSNACOSD8.4	8.4	61	121
AYSNACOSD8.5	8.5	61	121
AYSNACOSD8.6	8.6	61	121
AYSNACOSD8.7	8.7	61	121
AYSNACOSD8.8	8.8	63	124
AYSNACOSD8.9	8.9	63	124
AYSNACOSD9.0	9	63	124
AYSNACOSD9.1	9.1	63	124
AYSNACOSD9.2	9.2	65	127
AYSNACOSD9.3	9.3	65	127
AYSNACOSD9.4	9.4	65	127
AYSNACOSD9.5	9.5	65	127
AYSNACOSD9.6	9.6	67	130
AYSNACOSD9.7	9.7	67	130
AYSNACOSD9.8	9.8	67	130
AYSNACOSD9.9	9.9	67	130

10~11.9

67~77

130~146

6.47~6.83

135

Expand this group (20 specs)

Part No.	Dia.	Flute length	Overall length
AYSNACOSD10.0	10	67	130
AYSNACOSD10.1	10.1	69	133
AYSNACOSD10.2	10.2	69	133
AYSNACOSD10.3	10.3	69	133
AYSNACOSD10.4	10.4	69	133
AYSNACOSD10.5	10.5	70	137
AYSNACOSD10.6	10.6	70	137
AYSNACOSD10.7	10.7	70	137
AYSNACOSD10.8	10.8	72	140
AYSNACOSD10.9	10.9	72	140
AYSNACOSD11.0	11	72	140
AYSNACOSD11.1	11.1	72	140
AYSNACOSD11.2	11.2	75	143
AYSNACOSD11.3	11.3	75	143
AYSNACOSD11.4	11.4	75	143
AYSNACOSD11.5	11.5	75	143
AYSNACOSD11.6	11.6	77	146
AYSNACOSD11.7	11.7	77	146
AYSNACOSD11.8	11.8	77	146
AYSNACOSD11.9	11.9	77	146

12~13

78~80

149~152

6.15~6.5

135

Expand this group (11 specs)

Part No.	Dia.	Flute length	Overall length
AYSNACOSD12.0	12	78	149
AYSNACOSD12.1	12.1	78	149
AYSNACOSD12.2	12.2	78	149
AYSNACOSD12.3	12.3	78	149
AYSNACOSD12.4	12.4	80	152
AYSNACOSD12.5	12.5	80	152
AYSNACOSD12.6	12.6	80	152
AYSNACOSD12.7	12.7	80	152
AYSNACOSD12.8	12.8	80	152
AYSNACOSD12.9	12.9	80	152
AYSNACOSD13.0	13	80	152

Specification Range

Diameter	0.5~13mm
Flute length	5~80mm
Overall length	27~152mm
Depth ratio	6.15~10.83

Product Description

NACHI 6520 COSD is the cobalt (HSS-CO) straight shank drill, with the cobalt there for stainless. Cobalt in the substrate raises red hardness so it lasts longer in stainless than plain 500 SD; the next step up is a coated drill such as 6594P AGSUSR or the SG series. It is made from cobalt high speed steel (HSS-CO), uncoated. Sizes cover diameter 0.5~13mm, flute length 5~80mm, overall length 27~152mm, 126 in total, made in Japan. Cobalt or TiN? Cobalt changes the substrate and survives regrinding; a coating is a surface layer that is lost once ground away. For stainless, cobalt. It suits carbon and alloy steel, stainless steel, copper, aluminium and other non-ferrous metals with workpiece hardness up to HRC40. Typical uses: drilling stainless steel and SUS plate, and jobs where a plain drill burns up. The family also includes the baseline 500 SD (diameter 0.2~17.5mm, rated to HRC30) and the TiN coated 520P GSD (also HRC30); for both a coating and cobalt, 6568P GSS (stub) and 6550P GLSD (long) are each rated to HRC40.

Workpiece Materials & Hardness

Steel (P)
Stainless steel (M)
Non-ferrous metals (N)

Max. workpiece hardness HRC40

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