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Manufacturer number:
Cat. Nr.:
Machine tap, uncoated, Rc: 1/8-28
Article no.: 138120 1/8-28
Article code:
- Thread type: Rc
- Flank angle: 55
- Tool material: HSS E
- Standard: DIN 2181
- Thread standard: DIN EN 10226-2
Product details
Technical Data
| Thread size | Rc1/8-28 | |
| Coating | uncoated | |
| Thread type | Rc | |
| Flank angle | 55 degrees | |
| Tool material | HSS E | |
| Standard | DIN 2181 | |
| Thread standard | DIN EN 10226-2 | |
| Taper lead form | C | |
| Taper ratio | 1:16 | |
| Shank | Plain shank with h9 | |
| Through-coolant | no | |
| Application for type of drilling | Blind hole; Through hole | |
| Cutting direction | right-hand | |
| Thread pitch | 0.907 mm | |
| Threads per inch | 28 | |
| Overall length L | 63 mm | |
| Shank ⌀ Ds | 7 mm | |
| Shank square □ | 5.5 mm | |
| Tapping hole ⌀ A | 8.15 mm | |
| Tapping hole ⌀ B | 8.1 mm | |
| Thread gauge ⌀ Dmax JS11 | 8.57 mm | |
| Tapping hole minimum depth | 11.1 mm | |
| Thread ⌀ | 9.72 mm | |
| Type of threading tool | Machine tap for conventional machining | |
| Number of clamping slots | 5 | |
| Colour ring | without | |
| Number of cutting edges Z | 5 | |
| Thread depth | 41 mm | |
| Type of product | Tap |
Identification & Classification
| Article number | 138120 1/8-28 | |
| EAN / GTIN | 4045197585585 | |
| Manufacturer number | 138120 1/8-28 | |
| Manufacturer/responsible person | Hoffmann Supply Chain GmbH & Co. KG, Poststraße 15, 90471 Nürnberg, Germany, www.hoffmann-group.com |
Application Table
N
9
N
9
P
7
P
6
P
5
K
5
N
9
Description
Version:
The short shank overhangs less and hence is more stable.
Application:
For use as machine tap or for cleaning existing threads by hand. Tapered Whitworth pipe thread (BSPT) to ISO 7/1 and BS21, for joints with sealant in the thread. See the table for the specified minimum size of the tapping hole.
Recommendation:
Tapping hole ⌀ A:
Pre-drill a plain hole without using a reamer. Variant A can be used if there is no risk of sealing problems.
Tapping hole ⌀ B:
Pre-drill a plain hole and then ream it using a 1:16 taper reamer (see No. 162650). The taper bore ⌀ can then be checked laterally by reference to the Dmax check dimension (see table). Variant B for drilling the tapping hole offers the best process reliability for the tapping operation and at the same time ensures the most reliable seal in the thread.
Pre-drill a plain hole without using a reamer. Variant A can be used if there is no risk of sealing problems.
Tapping hole ⌀ B:
Pre-drill a plain hole and then ream it using a 1:16 taper reamer (see No. 162650). The taper bore ⌀ can then be checked laterally by reference to the Dmax check dimension (see table). Variant B for drilling the tapping hole offers the best process reliability for the tapping operation and at the same time ensures the most reliable seal in the thread.