A stud, spindle, tie-rod or axle end with an M27×1.75 thread has lost its nut, or needs a second one, and no supplier lists the size? Every M27 nut on the shelf is ×3, ×2 or ×1.5. We turn M27×1.75 nuts in the ISO 4032 envelope or to your own height and shape, from one piece. No drawing needed: a photo with a rule, the measurements in a message, the old part or its part number is enough; we draw it, you approve, we machine. Get a quote →
Why the nut is missing from every catalogue
EKINSUN LTD is a custom parts manufacturer that turns special-pitch threads from two callouts, one piece up. Nut standards follow thread standards. ISO 4032 hex nuts are cut at the ISO 261 coarse pitch, M27×3; fine-pitch nuts to ISO 8673 cover M27×2 and M27×1.5. A 1.75 mm pitch exists in ISO 261 only at M12, so no nut standard reaches M27×1.75, no nut maker stocks it, and a lost nut on an M27×1.75 stud cannot be replaced with anything but a machined one.
Nut forms we turn with an M27×1.75 thread
The thread is single-point cut and gauged go/no-go with our own M27×1.75-6H plug gauge; the outside follows the standard nut outline or your own. The ISO 4032 envelope gives 13.6 turns of engagement at this pitch.
| Nut form | Outline we use | Where it goes |
|---|---|---|
| Hex nut | ISO 4032 envelope: 41 mm A/F, 45.2 mm min across corners, 23.8 mm high | Direct replacement for a lost or damaged nut on a stud or spindle |
| Thin (jam) nut | ISO 4035 outline, 41 mm A/F, height to your specification | Lock nut under a full nut, or where the stud is short |
| Coupling nut | DIN 6334 proportion, 81 mm long (3 × d), 41 mm A/F | Joining two M27×1.75 studs end to end, or extending a tie-rod |
| Slotted round nut | KM-style outline to your drawing, with tab-washer slot | Bearing or sleeve retention on a shaft with M27×1.75; the KM series has no M27 size |
| Flange nut | 41 mm A/F with a 45–50 mm washer face | Soft or slotted seats where a plain nut would dig in |
| Nyloc / all-metal prevailing torque | ISO 4032 envelope plus insert or deformed collar | Vibration; specify which style your assembly uses |
| Cap or domed nut | Closed end, height to cover the stud protrusion | Exposed stud ends, washdown areas |
Check the stud before ordering the nut
A nut that will not run on is more often a pitch problem than a damage problem. Read ten threads with a rule: 17.5 mm is M27×1.75, 15 mm is M27×1.5, 20 mm is M27×2. If the stud is damaged at the mouth, tell us; the nut can be made with a lead-in chamfer that clears a bruised first thread, or we make the stud too.
| Ten threads on the stud | Pitch | Nut to order |
|---|---|---|
| 17.5 mm | 1.75 | M27×1.75, turned to order here |
| 15.0 mm | 1.5 | M27×1.5 fine nut, stocked; buy it there, or ask us — we may have it in stock |
| 20.0 mm | 2.0 | M27×2 fine nut, stocked |
| 30.0 mm | 3.0 | M27×3 ISO 4032, on every shelf |
| 18.1 mm | 1.814 (14 TPI) | Inch thread near 27 mm: G3/4 or 3/4-14; not a metric nut |
Material and strength for a turned nut
ISO 898-2 property classes belong to nuts made and tested to that standard at standard pitches, so a turned M27×1.75 nut is specified by material instead. It ships with a material certificate and, on request, a hardness report.
| Material | Condition | Typical use |
|---|---|---|
| C45 / 1.0503 steel | Normalised or Q+T, zinc plated | General mechanical joints; matches a class 8 nut in proof load at full height |
| 42CrMo4 / 1.7225 | Quenched and tempered, 28–34 HRC | Loaded studs and tie-rods; proof load at or above a class 10 nut |
| 316 stainless / 1.4404 | Solution annealed, passivated | Outdoor, marine, chemical, food and washdown |
| 304 stainless / 1.4301 | Solution annealed | Indoor and dry service, lower cost than 316 |
| Brass CW614N / C360 | As machined | Water and gas fittings, non-sparking, no plating |
| Aluminium 6061 / 7075 | T6 | Weight-critical assemblies, light loads |
Price, lead time, delivery
There is no list price for a special-pitch part; a single piece starts from €65 and is quoted within 12 hours. One to a few dozen pieces ship in 5 working days, 50 to 500 in 15 working days, delivered DDP to your door with duties in the quote. The first piece is the sample; repeat orders run to the same drawing, with 500-piece and 1,000-piece runs priced lower per piece.
Where the M27 nut catalogue stops
| What you need | In the catalogue? | What to do |
|---|---|---|
| M27×3 hex nut, ISO 4032 | Yes | On every fastener shelf: buy it there, or ask us — we may have it in stock |
| M27×2 or M27×1.5 fine-pitch nut | Yes | Fine-thread suppliers; buy the stock part |
| M27×1.75 hex nut | No | Turned to order in the ISO 4032 envelope, MOQ 1 |
| M27×1.75 thin, coupling, flange or cap nut | No | Turned to the outline you specify |
| Slotted round nut with M27×1.75 | No; the KM series skips M27 | Made to a KM-style outline with tab-washer slot |
| M27×1.75 nut with a strength class marking | No | Material certificate and hardness report instead |
| Matching M27×1.75 stud or spindle end | No | Made with the nut from the same gauge |
Related M27×1.75 pages and nut families
Frequently asked
Can I buy an M27×1.75 nut?
No catalogue lists one. Hex nuts to ISO 4032 are made at M27×3, and fine-pitch nuts at M27×2 and M27×1.5; an M27×1.75 nut is turned to order. We cut it in the ISO 4032 envelope, 41 mm across flats and 23.8 mm high, or to any height and shape you specify, from one piece.
Will an M27×2 or M27×1.5 nut run onto an M27×1.75 stud?
It will start and jam within three turns. The pitch difference is 0.25 mm per thread either way, 2.5 mm over ten threads, and the flanks cross. Forcing it damages the stud, which is usually the part that cannot be replaced.
What height and across-flats does an M27×1.75 hex nut get?
By default the ISO 4032 envelope for M27: 41 mm across flats, 45.2 mm minimum across corners, 23.8 mm high, which gives 13.6 turns of engagement at 1.75 mm pitch. Thin nuts follow the ISO 4035 outline at the height you specify; a coupling nut runs 81 mm long at the DIN 6334 proportion of three diameters.
Is there a KM-type slotted bearing nut in M27×1.75?
The KM series has no M27 size at all: KM4 is M20×1, KM5 is M25×1.5, KM6 is M30×1.5 and KM7 is M35×1.5. A slotted round nut with an M27×1.75 thread is made to order to the KM outline you choose, with the locking-washer tab slot if you use one.
What strength class can an M27×1.75 nut have?
ISO 898-2 property classes are assigned to nuts made and tested to that standard at standard pitches. A turned M27×1.75 nut is supplied with a material certificate and, on request, a hardness report; in 42CrMo4 quenched and tempered its proof load matches or exceeds a class 10 nut of the same height, but it does not carry a class marking.
How much does an M27×1.75 nut cost?
There is no list price. A single nut starts from €65 and is quoted within 12 hours; ten or more pieces share the setup and cost far less each. Lead time is 5 working days for small quantities, delivered DDP to your door.
Tell us the nut. "M27×1.75 hex nut, 41 A/F, 316, 4 pieces" is enough; add a photo of the stud if the pitch is uncertain. Quote in 12 hours, MOQ 1. Get a quote →