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Description
16 ER 14 W inch threading insert – full 55° profile
Technical data for the full-profile insert for 14 threads per inch
| Technical data | |
|---|---|
| Designation | 16 ER 14 W MTA |
| Brand / part number | Horn / 9096 |
| Type | external threading insert, right-hand |
| Profile | full, Whitworth, 55° angle |
| Pitch | 14 threads per inch (P = 1.814 mm) |
| Thread depth | 1.16 mm |
| Thread tolerance class | G: class A or B |
| Insert size | 16: edge 16 mm, IC 9.525 mm |
| Cutting edges | 3 |
| Tool holders | right-hand external SER, size 16 |
| Grade | MTA: submicron carbide, PVD TiAlN |
Threads per inch14
Profilefull 55°
Depth1.16 mm
Tool holdersSER 16
16 ER 14 W inch threading insert turns the full external thread profile at 14 threads per inch: flanks, rounded roots, and crests. It can cut G pipe threads from G 1/2 to G 7/8, as well as Whitworth BSW 7/16" and BSF 5/8" and 11/16" threads. It works in size 16 right-hand SER holders. It has three corners for use in succession.
Full 55° profile – rounded thread root and crests
The insert finishes the thread crests in the same cycle
This insert
16 ER 14 W – full profile
Crests rounded at diameter d.
Comparison
Partial profile, e.g. 16 ER AG55
The crests retain the surface from turning the shaft.
Axial section of a G 1/2 thread after the final pass. Gold highlights the insert; the red line shows the surfaces machined by the insert.
The Whitworth profile has a 55° thread angle and rounded thread root and crests. The rounding radius is 0.137 times the pitch, or approximately 0.25 mm at 14 threads per inch. A full-profile insert turns the flanks and both radii in the same cycle, producing a complete thread profile without a separate shaft machining operation.
For a class A G 1/2 thread, the major diameter is 20.671–20.955 mm and the pitch diameter is 19.651–19.793 mm (ISO 228-1). Turn the shaft beforehand with a small machining allowance. If the diameter is too small, the crests will remain unmachined and the profile will be too shallow. Check the finished thread with a thread ring gauge or nut.
This insert
Full profile 16 ER 14 W
The insert cuts the flanks and the rounded root and crests of a thread with 14 threads per inch. The radii are formed in the same cycle as the flanks, ensuring a repeatable profile in production runs.
Choose for: production runs of threads with a single pitch.
Comparison
Partial profile, e.g. 16 ER AG55
The insert machines the flanks and root of the groove over a range of 48 to 8 threads per inch. It does not touch the crests: they retain the previously turned diameter.
Choose for: short runs and various pitches.
How the 16 ER 14 W insert cuts threads – passes, feed and cutting data
Feed of 1.814 mm per revolution (14 threads per inch) and 9–12 progressively shallower passes
Schematic illustration: insert in a right-hand SER holder in front of the lathe axis. Gold highlights the insert.
One spindle revolution – 1.814 mm of feed
The shaft rotates while the insert advances along the axis by 1.814 mm per spindle revolution. In a typical setup, the right-hand insert feeds toward the chuck and cuts a right-hand thread. During the final passes, its side edges trim the crests to the thread diameter.
Schematic illustration of passes for a G 1/2 thread. The lines show successive cutting edge positions.
Successive passes to a depth of 1.16 mm
The insert reaches a depth of 1.16 mm in 9–12 passes; use 10 as a starting point. The first pass removes the most material; the final pass removes 0.05–0.08 mm. Use flank infeed at an angle slightly less than 27.5°, which is half the profile angle: the insert then cuts mainly on one flank.
At the end of the thread next to the shoulder, machine a runout groove at least 2 mm wide and at least 1.16 mm deep.
Cutting speed for MTA grade
MTA grade is a submicron carbide with a PVD TiAlN coating for steel, stainless steel and cast iron. The speeds in the table apply to thread turning.
| Workpiece material | Cutting speed vc [m/min] |
|---|---|
| P Unalloyed steel, cast steel, free-cutting steel | 120–180 |
| P Low-alloy steel and cast steel (up to 5% alloying elements) | 80–130 |
| P High-alloy and tool steel | 60–80 |
| M Stainless steel and stainless cast steel | 90–130 |
| K Gray cast iron | 120–130 |
| K Ductile and malleable cast iron | 100–130 |
Spindle speed and feed for G 1/2
Pitch P is measured along the axis between corresponding points on adjacent thread turns.
For each spindle revolution, the insert advances by one pitch: fn = P = 1.814 mm/rev.
Example: G 1/2 in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 20.955) ≈ 1520 rpm
vf = n × P = 1520 × 1.814
2758 mm/min
feed rate
d – thread diameter (20.955 mm), n – spindle speed, vc – cutting speed from the middle of the range in the table, vf – feed rate.
Calculate the helix angle β using tan β = P / (π × d), where P is the pitch and d is the thread diameter. For G 1/2: 1.814 / (π × 20.955) = 0.028, giving β ≈ 1.58°. Standard threading holder shims tilt the insert by 1–1.5°, so they do not need to be replaced for this thread.
Threads with 14 threads per inch – G 1/2 to G 7/8
One insert, all G pipe threads with this threads-per-inch value
Shaft diameters shown to the same scale. The tooth profile and thread depth are identical on each.
The threads-per-inch value and thread tooth profile are independent of diameter. Thread depth at 14 threads per inch is always 1.16 mm, for both G 1/2 and G 7/8. The shaft being machined determines the thread diameter, not the insert.
The 16 ER 14 W insert can cut any G pipe thread with 14 threads per inch to ISO 228-1: G 1/2, G 5/8, G 3/4, and G 7/8. Whitworth BSW and BSF threads with the same number of threads per inch have the same 55° profile.
| 55° thread type | Sizes with 14 threads per inch |
|---|---|
| G pipe threadsISO 228-1, sealing outside the thread | G 1/2G 5/8G 3/4G 7/8 |
| Whitworth BSWcoarse thread, B.S. 84 | 7/16" |
| Whitworth BSFfine thread, B.S. 84 | 5/8"11/16" |
G 1/2 is highlighted in gold – the thread shown in the drawings and calculation example in this description.
Decoding the 16 ER 14 W designation – element by element
Size, cutting hand, threads-per-inch value, profile and grade in the insert designation, holder selection
Dimensions according to catalogs for inserts of this standard. Enlarged corner detail.
16 ER 14 W insert dimensions
Size 16 indicates an edge length of 16 mm and an inscribed circle IC of 9.525 mm, or 3/8 inch; it is not the thread diameter. Dimensions X = 1.0 mm and Y = 1.2 mm specify the cutting tip position relative to the insert sides. The corner reproduces the Whitworth profile: a 55° angle and rounding radii of 0.137 times the pitch.
16
Insert size
Edge 16 mm, IC 9.525 mm.
E
External thread
Turning on shafts and journals.
R
Right-hand version
SER holder, feed toward the chuck.
14
Threads per inch
14 threads per inch, 1.814 mm pitch.
W
Whitworth profile
55° angle, full profile, rounded root.
MTA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
Only 14 threads per inch and external threads
The insert profile matches a single pitch (threads-per-inch value). At a different feed, the insert flanks will not align with the thread flanks, producing a distorted thread. An internal thread has a different depth and radii, so it requires an internal threading insert in an internal holder.
Mount the threading insert in right-hand external SER holders for size 16 inserts, e.g. SER 1616 H16, SER 2020 K16 or SER 2525 M16. A right-hand external insert works only in a right-hand external holder.
The 16 ER 14 W inch threading insert finishes a thread with 14 threads per inch, including the rounded crests. One insert can cut G pipe threads from G 1/2 to G 7/8, always at the same depth of 1.16 mm. It is suitable for production runs of fittings and valves with G threads.
16 ER 14 W – questions about selection and applications
Key information before selecting an insert
You can cut external G pipe threads with 14 threads per inch: G 1/2 to G 7/8, as well as Whitworth threads with the same number of threads per inch.
Yes. The full profile rounds the thread crests at the major diameter, e.g., to 20.671–20.955 mm for a class A G 1/2 thread. Simply turn the shaft beforehand with a small machining allowance.
The Whitworth profile depth is 0.6403 times the pitch, or 1.16 mm at 14 threads per inch (1.814 mm pitch). It is the same for every G thread with this threads-per-inch value.
Right-hand external SER holders for size 16 inserts, e.g. SER 1616 H16, SER 2020 K16, SER 2525 M16 or SER 3232 P16.
Usually 9 to 12 passes; start with 10. For harder materials, add passes instead of increasing the cutting speed.
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