Set-screw, two-piece split clamp, keyed and threaded collars in the bores, widths and materials no catalog stocks. Non-standard shaft sizes, large bores, 316L and titanium — or a new one measured from the worn original.
Standard shaft collars are cheap and everywhere — so the honest first question is whether you even need a custom one. Here's the line we draw before quoting:
A standard metric or imperial bore in a common size, ordinary steel or 303 stainless, standard width. Ruland, Stafford, KIPP, JW Winco and McMaster stock these by the thousand — order them there, you'll have them tomorrow and cheaper than anything made to order.
A non-standard or in-between bore, a large or oversize bore, a keyed / hex / threaded bore, 316L or titanium for washdown or marine, an odd width or OD, or a replacement for a worn collar with no part number. Here the size or material simply isn't on a shelf — that's a turning job.
Not sure which side you're on? Send the shaft diameter and what the collar has to do. If a catalog part fits, we'll tell you to buy it — we only want the jobs that genuinely need machining.
| Type | How it holds | When to choose it |
|---|---|---|
| One-piece set-screw (DIN 705) | One or two grub screws bear on the shaft — style A slit / DIN 553, style E hex socket / DIN EN ISO 4027 | Light, low-vibration positioning; cheapest; accepts a small screw mark on the shaft |
| Two-piece split clamp | Two halves draw together and grip the full circumference — no shaft marring | Higher torque, frequent adjustment, or install without pulling the shaft |
| One-piece clamp (split) | A single collar with a saw cut and a clamp screw | Clamp holding power where the shaft end is open for assembly |
| Flange-mounting collar | Adds a bolt circle to fix guards, discs, sprockets or hubs to the collar face | Mounting another component concentric to the shaft |
| Keyed collar | Keyway in the bore transmits torque through a key, not friction | The highest loads, where even a clamp could creep |
The bore is where a machined collar earns its keep. A set screw is fine until it isn't: the point dents the shaft (making the collar hard to reposition and the shaft hard to reuse) and, under vibration or reversing load, it works loose and the collar creeps. When that's your problem, the fix is a different bore, not a tighter screw:
| Bore style | What it's for |
|---|---|
| Round (plain) | Standard bore for set-screw or clamp collars — turned to your exact shaft diameter and fit |
| Keyed (keyway) | Positive torque transfer through a key; sized to your key and shaft, DIN 6885 / ISO 773 keyways |
| Hexagonal / square | Locks onto a hex or square shaft with no screw at all |
| Threaded | Screws onto a threaded shaft or leadscrew as an adjustable stop or nut-style collar |
| Stepped / counterbored | Two diameters in one collar to seat a bearing, seal or spacer against a shoulder |
| Attribute | Range |
|---|---|
| Bore | 3 mm to 200 mm+ and imperial equivalents; any non-standard or in-between size, to your specified fit and clearance |
| Fixing | Set screw (DIN 705 A/E), split clamp, keyway, hex/square bore, thread |
| Materials | Mild & alloy steel, 303 / 304 / 316L stainless, aluminum (anodized), brass, titanium Grade 5, Delrin / nylon |
| Finish | Plain, black oxide, zinc plate, passivated; anodized on aluminum |
| Standards referenced | DIN 705 (metric set collars), BS 4185, grub screws to DIN 553 / DIN EN ISO 4027 |
| Documentation | EN 10204 3.1 material certificate and dimensional report on request |
A shaft collar is essentially a ring, so material choice drives its weight and cost directly. A steel or 316L collar carries the most clamp load; a 6061 aluminum collar cuts rotating weight on a fast or portable shaft; titanium does both at a premium. Enter your collar's bore, outer diameter and width to see the exact weight and relative material cost of each option:
An in-between bore plus a slipping screw is the classic case for a two-piece split clamp collar. We machine the bore to 34 mm at a proper fit, in a split clamp that grips the whole circumference — no more marks on the shaft, and it comes off for maintenance without dismantling.
Washdown means 316L, passivated, often with a clamp bore to avoid a screw pocket that traps water. We turn them in the exact bore and width, with a 3.1 certificate for the audit file.
Send the old one. We measure bore, OD, width, and screw or key positions and reproduce it from the sample — in the original material or an upgrade — with spares in the same run.
Matched running gear: collars are rarely ordered alone. We machine the mating shaft, bushings, spacers and shaft couplings in the same material and run, so an assembly arrives as one consistent, certified set instead of five separate orders.
Yes — an odd or in-between bore is the most common reason to have a collar machined. Catalog collars come in fixed sizes; if your shaft is 34 mm, 1-3/16 inch or worn undersize, we turn the bore to the exact fit you specify. Send the shaft diameter and we machine to it.
Set-screw (DIN 705) is simplest and cheapest but marks the shaft and can slip under vibration. A two-piece split clamp grips the whole circumference without marring and holds far more torque. Add a keyway for the highest loads. We machine all three and advise for your torque and shaft.
Yes — up to 200 mm bore and larger, in steel or stainless, one-piece or split. Oversize is exactly where catalog ranges thin out, so machining is often the only practical route.
Yes. Mail the old collar, even worn or in pieces. We measure bore, OD, width and screw/key positions and machine new ones — same or upgraded material — plus spares. No drawing or part number needed.
One piece. No tooling charge — a single 316L collar with an odd bore is a normal order. Unit price falls on batches, all tiers quoted upfront.
Shaft diameter, fixing type and material — or the worn original. Engineers reply in 24h.
// Qty & price
1 pc
Sample price
Confirm fit before a run
3–50
Unit price drops
Setup cost shared
50+
Best price
All tiers quoted upfront
Odd bore, large bore, keyed or threaded, 316L or titanium — machined to your shaft or measured from the worn original. Quote in 24 hours.