Active Member
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[China]
Address: Room#7B014, Lanxi Garden, No.8 xingShansi East Street, Xi'An City , P.R.China
Contact name:Felix MU
Xian Mager Machinery International Trade Co., Ltd. |
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Standard Step Drills.
An essential tool for every tool room.One tool does two jobs in a
single pass.They can be sharpened repeatedly and are easily
modified for any special length-of-step.
1,High Speed Steel-Jobber's Length
2,3/8" & 1/4" Shank
For Drilling & Counterboring Cap Screw Clearance Holes.
| Screw Size | Minor Dia. | Major Dia. | Step Length |
| No.6 | .150 | 1/4 | 1/2 |
| No.8 | .178 | L | 1/2 |
| No.10 | .204 | Q | 5/8 |
| 1/4 | 9/32 | 13/32 | 11/16 |
| 5/16 | 11/32 | 1/2 | 3/4 |
| 3/8 | 13/32 | 19/32 | 7/8 |
For Drilling 45° Chamfered Holes To Be Tapped
(To Produce approximately 70° thread)
| Screw Size | Minor Dia. | Major Dia. | Step Length |
| 5-40 | .101 | 9/64 | 1/2 |
| 6-32 | .109 | 5/32 | 1/2 |
| 8-32 | .136 | 3/16 | 1/2 |
| 8-36 | .136 | 3/16 | 1/2 |
| 10-24 | .152 | 1/4 | 5/8 |
| 10-32 | .161 | 1/4 | 5/8 |
| 1/4-20 | .204 | 21/64 | 13/16 |
| 1/4-28 | .218 | 21/64 | 13/16 |
| 5/16-18 | .261 | 13/32 | 15/16 |
| 5/16-24 | .272 | 13/32 | 15/16 |
| 3/8-16 | .316 | 31/64 | 1 |
| 3/8-24 | .339 | 31/64 | 1 |
| 7/16-14 | .375 | 17/32 | 1-1/16 |
| 7/16-20 | .390 | 17/32 | 1-1/16 |
| 1/2-13 | .437 | 5/8 | 1-1/16 |
| 1/2-20 | .452 | 5/8 | 1-1/16 |
For Drilling & Countersinking 82° Flat Head Machine Screws
| Screw Size | Minor Dia. | Major Dia. | Step Length |
| No.6 | 0.142 | 9/32 | 1/2 |
| No.8 | .169 | Q | 1/2 |
| No.10 | .196 | W | 5/8 |
| 1/4 | .257 | 1/2 | 11/16 |
| 5/16 | .320 | 5/8 | 3/4 |
| 3/8 | .383 | 3/4 | 7/8 |
| 1/2 | .510 | 7/8 | 1 |
*Shorter than jobber's length
