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Machine tap, uncoated, NPT: 1/8-27

Article no.: 138090 1/8-27

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NPT Unit price incl. VAT
  • Thread type: NPT
  • Flank angle: 60
  • Tool material: HSS E
  • Standard: Manufacturer’s standard
  • Thread standard: ANSI B 1.20.1

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Product details

Technical Data

Thread size 1/8-27 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 0.941 mm
Threads per inch 27
Overall length L 90 mm
Shank ⌀ Ds 7 mm
Shank square □ 5.5 mm
Tapping hole ⌀ A 8.5 mm
Tapping hole ⌀ B 8.25 mm
Thread gauge ⌀ Dmax + 0.05 8.74 mm
Tapping hole minimum depth 12 mm
Thread ⌀ 10.242 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 19.732 mm
Type of product Tap

Identification numbers & Classifications

Article number 138090 1/8-27
EAN / GTIN 4045197585516
Manufacturer number 138090 1/8-27

Application Table

Aluminium (short chipping)
N
13
Steel < 500 N/mm²
P
13
Steel < 750 N/mm²
P
10
GG(G)
K
9
CuZn
N
13
Oil
 
wet maximum
 

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.

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