- 98% satisfied customers
- 72h delivery
- 30 dni na zwrot
Description
16 EL 3.5 ISO BMA metric threading insert – full profile
Technical data for the full-profile insert for 3.5 mm pitch
| Technical data | |
|---|---|
| Designation | 16 EL 3.5 ISO BMA |
| Brand / part number | Fanar / 0000009285 |
| Type | external threading insert, left-hand |
| Profile | full, ISO metric, 60° angle |
| Pitch | 3.5 mm |
| Thread depth | 2.15 mm |
| Thread tolerance class | 6g |
| Insert size | 16: edge 16 mm, IC 9.525 mm |
| Cutting edges | 3 |
| Tool holders | left-hand external SEL, size 16 |
| Grade | BMA: submicron carbide, PVD TiAlN |
Pitch3.5 mm
Profilefull ISO
Depth2.15 mm
Tool holdersSEL 16
16 EL 3.5 ISO BMA metric threading insert turns the full external thread profile at a pitch of 3.5 mm: flanks, root, and crests. It can cut M30 and M33 coarse threads. It operates in size 16 left-hand SEL holders. It has three corners for sequential use.
Full ISO profile – flanks, root and major thread diameter
The insert finishes the thread crests in the same cycle
This insert
16 EL 3.5 ISO – full profile
Crests trimmed to diameter d.
Comparison
Partial profile, e.g., 16 EL AG60
The crests retain the surface from turning the shaft.
Axial cross section of an M30 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 0.44 mm.
For an M30 thread in tolerance class 6g, the major diameter is 29.522–29.947 mm and the pitch diameter is 27.462–27.674 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 16 EL 3.5 ISO
The insert turns the flanks, root and crests of a thread with a 3.5 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., 16 EL AG60
The insert machines the flanks and root of the groove over a pitch range of 0.5–3.0 mm. It does not touch the crests: they retain the previously turned diameter.
Choose for: short runs and various pitches.
How the 16 EL 3.5 ISO insert cuts threads – passes, feed, and cutting data
Feed of 3.5 mm per revolution and 9–19 progressively shallower passes
Schematic: insert in a left-hand SEL holder in front of the lathe axis. The insert is highlighted in gold.
One spindle revolution – 3.5 mm of feed
The shaft rotates while the insert moves along the axis by 3.5 mm per spindle revolution. In a typical setup, the left-hand insert feeds toward the chuck and cuts a left-hand thread. During the final passes, its side edges trim the crests to the thread diameter.
Schematic illustration of the passes for an M30 thread. The lines show successive cutting edge positions.
Successive passes to a depth of 2.15 mm
The insert reaches a depth of 2.15 mm in 9–19 passes (a value interpolated from the manufacturer's table); use 14 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 3.7 mm wide and at least 2.15 mm deep.
Cutting speed for BMA grade
BMA is a submicron carbide grade with a PVD TiAlN coating for steels, stainless steels 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 M30
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 = 3.5 mm/rev.
Example: M30 in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 30) ≈ 1060 rpm
vf = n × P = 1060 × 3.5
3710 mm/min
feed rate
d – thread diameter (30 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 the formula tan β = P / (π × d), where P is the pitch and d is the thread diameter. For M30: 3.5 / (π × 30) = 0.037, giving β ≈ 2.13°. Standard threading holder shims tilt the insert by 1–1.5°. This thread has a larger angle, so select a shim with a tilt closer to 2.1° using the holder manufacturer's table.
Threads with a 3.5 mm pitch – M30 and M33
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 3.5 mm pitch is always 2.15 mm, for both M30 and M33. The thread diameter is determined by the shaft being machined, not by the insert.
The 16 EL 3.5 ISO insert can cut M30 and M33 coarse threads.
| Group according to PN-ISO 261 | Thread sizes with a 3.5 mm pitch |
|---|---|
| Coarse threadstandard pitch 3.5 mm | M30M33 |
M30 is highlighted in gold – the thread used in the drawings and calculation example in this description.
Decoding the 16 EL 3.5 ISO designation – part by part
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.
16 EL 3.5 ISO insert dimensions
Size 16 denotes 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 = 1.2 mm and Y = 1.7 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.
16
Insert size
Edge 16 mm, IC 9.525 mm.
E
External thread
Turning on shafts and journals.
L
Left-hand version
SEL holder, feeding toward the chuck.
3.5
Thread pitch
3.5 mm; one insert for one pitch.
ISO
Metric profile
Angle 60°, full profile, class 6g.
BMA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
Only for 3.5 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 left-hand SEL external holders for size 16 inserts, e.g., SEL 1616 H16, SEL 2020 K16, or SEL 2525 M16. A left-hand external insert operates only in a left-hand external holder.
The 16 EL 3.5 ISO BMA metric threading insert finishes a thread with a 3.5 mm pitch, including the crests, without a separate finish-turning operation on the diameter. A single insert can cut 2 sizes from the standard table, from M30 to M33, always at the same depth of 2.15 mm. It is suitable for production runs requiring a consistent profile.
16 EL 3.5 ISO – selection and application questions
Key information before selecting an insert
You can cut all external metric threads with a 3.5 mm pitch: M30 and M33 coarse threads.
Yes. The full profile trims the thread crests at the major diameter, for example to 29.522–29.947 mm for M30 in tolerance class 6g. Simply pre-turn the shaft with a small machining allowance.
The external thread depth is 2.15 mm, or 0.6134 times the pitch. It is the same for M30 and M33, because it depends only on the pitch.
Left-hand SEL external holders for size 16 inserts, e.g., SEL 1616 H16, SEL 2020 K16, SEL 2525 M16, or SEL 3232 P16.
Usually 9 to 19 passes; use 14 as a starting point. The range is interpolated from the manufacturer's table for adjacent pitches.
Product accessories
Reviews
No customer reviews for the moment.
Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
Recommended for you
Viewed products
This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.
Cookie preferences
Functional cookiesTechnical
Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.
Advertising Cookies
These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.
Analytics cookies
Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.