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Article no.: 138095 1/4-18
Machine tap, uncoated, NPT: 1/4-18
Article no.: 138090 1/4-18
Article code:
- Thread type: NPT
- Flank angle: 60
- Tool material: HSS E
- Standard: Manufacturer’s standard
- Thread standard: ANSI B 1.20.1
Product details
Technical Data
| Thread size | 1/4-18 NPT | |
| Coating | uncoated | |
| Thread type | NPT | |
| Flank angle | 60 degrees | |
| Tool material | HSS E | |
| Standard | Manufacturer’s standard | |
| Thread standard | ANSI B 1.20.1 | |
| 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 | 1.411 mm | |
| Threads per inch | 18 | |
| Overall length L | 100 mm | |
| Shank ⌀ Ds | 11 mm | |
| Shank square □ | 9 mm | |
| Tapping hole ⌀ A | 11.1 mm | |
| Tapping hole ⌀ B | 10.75 mm | |
| Thread gauge ⌀ Dmax + 0.05 | 11.36 mm | |
| Tapping hole minimum depth | 17.5 mm | |
| Thread ⌀ | 13.616 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 | 25.84 mm | |
| Type of product | Tap |
Identification & Classification
| Article number | 138090 1/4-18 | |
| EAN / GTIN | 4045197585523 | |
| Manufacturer number | 138090 1/4-18 | |
| Manufacturer/responsible person | Hoffmann Supply Chain GmbH & Co. KG, Poststraße 15, 90471 Nürnberg, Germany, www.hoffmann-group.com |
Application Table
N
13
P
13
P
10
K
9
N
13
Description
Version:
Sturdy version, with straight flutes.
Application:
Tapered pipe threads (NPT) to ANSI B1.20.1, for threads with sealants. 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.
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.
Pre-drill a plain hole without using a reamer.
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.