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Description
Metric threading insert 22 ER 5 ISO – full profile
Technical data for the full-profile insert for 5 mm pitch
| Technical data | |
|---|---|
| Designation | 22 ER 5 ISO HTA |
| Brand / part number | Horn / 14914 |
| Type | external threading insert, right-hand |
| Profile | full, ISO metric, 60° angle |
| Pitch | 5 mm |
| Thread depth | 3.07 mm |
| Thread tolerance class | 6g |
| Insert size | 22: edge 22 mm, IC 12.7 mm |
| Cutting edges | 3 |
| Tool holders | right-hand external SER, size 22 |
| Grade | HTA: submicron carbide, PVD TiAlN |
Pitch5 mm
Profilefull ISO
Depth3.07 mm
Tool holdersSER 22
Metric threading insert 22 ER 5 ISO turns the full profile of an external thread with a 5 mm pitch: flanks, root, and crests. It can cut M48 and M52 coarse threads. It works in size 22 right-hand SER holders. It has three corners for successive use.
Full ISO profile – flanks, root and major thread diameter
The insert finishes the thread crests in the same cycle
This insert
22 ER 5 ISO – full profile
Crests trimmed to diameter d.
Comparison
Partial profile, e.g., 22 ER N60
The crests retain the surface from turning the shaft.
Axial cross section of an M48 thread after the final pass. Gold highlights the insert; the red line marks the surfaces machined by the insert.
A full-profile threading insert has short edges on both sides of the tooth. During the final passes, these trim the adjacent thread crests to the major thread diameter. The insert therefore turns both the groove and the thread diameter itself, with a crest flat equal to 1/8 of the pitch, or approximately 0.62 mm.
For an M48 thread in tolerance class 6g, the major diameter is 47.399–47.929 mm and the pitch diameter is 44.431–44.681 mm. Pre-turn the shaft 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 a nut.
This insert
Full profile 22 ER 5 ISO
The insert turns the flanks, root and crests of a thread with a 5 mm pitch. The crest is 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., 22 ER N60
The insert machines the flanks and root of the groove over a pitch range of 3.5–5.0 mm. It does not touch the crests: they retain the previously turned diameter.
Choose for: short runs and various pitches.
How the 22 ER 5 ISO insert cuts threads – passes, feed and cutting data
Feed of 5 mm per revolution and 11–21 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 – 5 mm of feed
The shaft rotates while the insert advances along the axis by 5 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 the passes for an M48 thread. The lines show successive cutting edge positions.
Successive passes to a depth of 3.07 mm
The insert reaches a depth of 3.07 mm in 11–21 passes (a value interpolated from the manufacturer's table); use 16 as a starting point. The first pass removes the most material, and the last removes 0.05–0.08 mm. Use flank infeed at 29–30° to the radial direction: the insert then cuts mainly on one flank.
At the end of the thread next to the shoulder, machine a runout groove at least 5.3 mm wide and at least 3.07 mm deep.
Cutting speed for HTA grade
HTA 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 M48
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 = 5 mm/rev.
Example: M48 in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 48) ≈ 660 rpm
vf = n × P = 660 × 5
3300 mm/min
feed rate
d – thread diameter (48 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 M48: 5 / (π × 48) = 0.033, giving β ≈ 1.90°. Standard threading holder shims tilt the insert by 1–1.5°, so they do not need to be replaced for this thread.
Threads with a 5 mm pitch – M48 and M52
One insert, many diameters with the same pitch
Shaft diameters shown to the same scale. The tooth profile and thread depth are identical on each.
The pitch and thread profile do not depend on the diameter. The depth of a thread with a 5 mm pitch is always 3.07 mm, for both M48 and M52. The thread diameter is determined by the shaft being machined, not by the insert.
The 22 ER 5 ISO insert can cut M48 and M52 coarse threads.
| Group according to PN-ISO 261 | Thread sizes with a 5 mm pitch |
|---|---|
| Coarse threadstandard pitch 5 mm | M48M52 |
M48 is highlighted in gold – the thread used in the drawings and calculation example in this description.
Decoding the 22 ER 5 ISO designation – element by element
Size, operating hand, pitch, profile and grade in the insert designation, holder selection
Dimensions according to catalogs for inserts of this standard. Enlarged corner detail.
Dimensions of the 22 ER 5 ISO insert
Size 22 denotes an edge length of 22 mm and an inscribed circle IC of 12.7 mm, or 1/2 inch; it is not the thread diameter. Dimensions X = 1.7 mm and Y = 2.5 mm specify the position of the cutting tip relative to the insert sides. The corner reproduces the ISO profile: an angle of 60°, a thread crest of 1/8 of the pitch and a root of 1/4 of the pitch in the nominal profile.
22
Insert size
Edge 22 mm, IC 12.7 mm.
E
External thread
Turning on shafts and journals.
R
Right-hand version
SER holder, feed toward the chuck.
5
Thread pitch
5 mm; one insert for one pitch.
ISO
Metric profile
Angle 60°, full profile, class 6g.
HTA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
Only for 5 mm pitch and external threads
The insert profile matches a single pitch. At a different feed, the insert flanks will not align with the thread flanks, resulting in 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 SER external holders for size 22 inserts, such as SER 2525 M22, SER 3232 P22 or SER 4040 R22. A right-hand external insert works only in a right-hand external holder.
The 22 ER 5 ISO metric threading insert finishes a thread with a 5 mm pitch, including the crests, without a separate pass to turn the diameter to its final size. One insert can cut 2 sizes listed in the standard, from M48 to M52, always at the same depth of 3.07 mm. It is suitable for production runs where a consistent profile matters.
22 ER 5 ISO – questions about selection and applications
Key information before selecting an insert
You can cut all external metric threads with a 5 mm pitch: M48 and M52 coarse threads.
Yes. The full profile trims the thread crests at the major diameter, for example to 47.399–47.929 mm for M48 in tolerance class 6g. Simply pre-turn the shaft with a small machining allowance.
The external thread depth is 3.07 mm, or 0.6134 times the pitch. It is the same for M48 and M52, because it depends only on the pitch.
Right-hand SER external holders for size 22 inserts, such as SER 2525 M22, SER 3232 P22 or SER 4040 R22.
Usually 11 to 21 passes; use 16 as a starting point. The range is interpolated from the manufacturer's table for adjacent pitches.
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