Need a special fastener a distributor won't supply? If it's non-standard — an odd thread, a special head, an unusual length, an exotic material, or a part defined only by your drawing or an old sample — that's exactly what we manufacture, in small batches, without a tooling bill.
What Is a Special Fastener?
A special fastener is any fastener that isn't a standard catalogue item. In practice that means one or more of: a non-standard thread or pitch, a special head or drive, an unusual length or diameter, a shoulder or stepped form, an exotic material, or simply a part made to your own drawing. The moment a distributor says "non-stock" or quotes a five-figure minimum, you're looking at a special — and that is the whole of what we do.
EKINSUN manufactures special fasteners to your drawing, specification or physical sample, in low to medium volumes, with a quote back within 24 hours. We are a manufacturer, not a stockist: if a standard part covers the job a distributor will always be cheaper, and we'll tell you so. When it doesn't exist off the shelf, that's what we're for.
Special vs Standard — Where the Line Is
| Standard (buy off the shelf) | Special (we manufacture) |
|---|---|
| Common metric / UNC / UNF sizes | Non-standard threads, odd pitches, BSW/BSF/BA |
| Standard hex / socket heads | Special heads, drives, shoulders, stepped forms |
| Catalogue lengths | Any length, oversize or extra-long |
| Carbon & basic stainless | Duplex, Inconel, Monel, Hastelloy, titanium |
| Bulk quantities | 1 piece to medium batch, no tooling cost |
Special Fasteners We Manufacture
Special bolts & screws
Non-standard threads, special heads, shoulder and stepped bolts, extra-long and oversize.
Special studs & studbolts
Double-end, tap-end, waisted and reduced-shank studs; mixed threads end to end.
Special nuts
Castle, slotted, cap, coupling, thin and heavy nuts in non-standard sizes and threads.
Special pins & dowels
Shouldered, grooved, drilled and stepped pins to drawing.
Exotic-alloy fasteners
Duplex, Inconel, Monel, Hastelloy and titanium for corrosion and temperature.
Reverse-engineered specials
Reproduced from a worn or obsolete sample when no drawing exists.
Special Heads, Drives & Forms
Often what makes a fastener "special" isn't the thread at all — it's the head, the drive or the shank. We machine forms that stock ranges don't carry:
- Heads: oversize and reduced hex, cheese, pan, countersunk, dome, square, T-head, hammer/eye and collar heads.
- Drives: socket (Allen), Torx, slotted, one-way and tamper-resistant/security drives.
- Shanks: shoulder and stepped bolts, waisted (reduced-shank) bolts, part-threaded and fully threaded, drilled for lockwire or split pins.
- Nuts: castle, slotted, cap/dome, coupling, thin and heavy-pattern in non-standard across-flats.
If your drawing calls out a head or drive nobody stocks, send it — head geometry is machined to your dimensions like any other feature.
Materials & Grades
| Family | Grades we machine | Typical use |
|---|---|---|
| Stainless | A2/304, A4/316, 303, 17-4PH | Corrosion resistance, marine, general special work |
| Duplex | Duplex & super duplex (e.g. 2205, 2507) | Chloride/seawater, high strength + corrosion |
| Nickel alloys | Inconel, Incoloy, Monel, Hastelloy | High temperature, aggressive chemical, oil & gas |
| Titanium | Grade 2, Grade 5 (Ti-6Al-4V) | Strength-to-weight, aerospace, motorsport |
| Alloy & high-tensile steel | Class 8.8 / 10.9 / 12.9, EN24T | Load-bearing, structural, machinery |
| Brass, bronze, plastics | Brass, aluminium bronze, PEEK, PTFE | Electrical, low-friction, non-magnetic, insulating |
Material certification to EN 10204 3.1 is available on request, with dimensional inspection to your drawing. We are ISO 9001:2015 certified. If your application needs a specific approval scheme, tell us the requirement before ordering so we can confirm exactly what we can certify.
Manufacturing Capability
| Feature | Typical range |
|---|---|
| Diameter | M2 – M64 (and imperial 1/8" – 2.1/2") |
| Length | A few mm to 600 mm+ (extra-long by arrangement) |
| Threads | Metric, UNC/UNF/UNEF, BSW/BSF/BA, BSP, ACME, left-hand, odd pitches |
| Tolerance | To your drawing; thread & diameter typically to standard class or tighter |
| Finish | Plain, black oxide, zinc, passivation, PTFE/Xylan coatings |
| Quantity | 1 piece to medium batch — no tooling charge |
Industries We Supply
Special fasteners made to drawing go into demanding, low-volume applications where a catalogue part won't do:
- Oil, gas & petrochemical — duplex and nickel-alloy studbolts and specials for corrosive service.
- Marine & offshore — 316, duplex and titanium fasteners for saltwater exposure.
- Machinery & heavy engineering — special bolts and studs for rebuilds and OEM assemblies.
- Motorsport & automotive — titanium and high-tensile specials, odd threads, weight-critical parts.
- Restoration & heritage — Whitworth and BSF specials and obsolete fasteners reproduced from a sample.
No drawing? No problem. Send one physical sample — even worn, sheared or corroded — and we reverse engineer it: gauge every feature, restore the worn ones to design intent, identify the thread, and manufacture a match. Free drawing with your quote. More on how we reverse engineer from a sample.
How It Works
1 · Send drawing or sample
A drawing, a dimensioned sketch, or one physical part — whatever you have.
2 · We draw & quote
We confirm the drawing (free if from a sample) and quote within 24h with material options.
3 · You approve
Approve the drawing and tiered pricing before anything is cut.
4 · We make & ship
Machined, inspected, certified if required, shipped worldwide with tracking.
Frequently Asked Questions
Any fastener that isn't a standard catalogue item — a non-standard thread or pitch, special head or drive, unusual length or diameter, shoulder/stepped form, exotic material, or a part made to your drawing. If a distributor calls it non-stock, it's a special, and that's what we make.
Yes — send a drawing, specification or dimensioned sketch. No drawing? One sample is enough; we gauge every feature, rebuild the drawing for free, confirm it, and machine to it. No CAD file needed from you.
One piece. No tooling charge on machined specials, so a single part for a prototype, trial fit or repair is normal. Unit price drops across small-batch tiers (10/50/100/500), quoted upfront.
Stainless (A2/A4/303/17-4PH), duplex and super duplex, nickel alloys (Inconel, Incoloy, Monel, Hastelloy), titanium, alloy and high-tensile steels (8.8/10.9/12.9), brass, bronze and plastics. We confirm the grade with your quote.
We manufacture to your drawing and material spec with dimensional inspection and EN 10204 3.1 certification on request, under ISO 9001:2015. If your application needs a specific approval scheme, tell us up front so we can confirm what we can and cannot certify before you order.
Yes. Send the original — even corroded, sheared or stripped. We measure the intact features, restore worn ones to design intent, identify the thread, and manufacture a match.
Quote within 24 hours of your drawing, sample or dimensions. Typical lead time is 1–3 weeks by material and quantity, plus tracked worldwide shipping. Urgent small batches can often be expedited.
Get a Special Fastener Quote
Send a drawing, sample or dimensions — we reply within 24 hours.
// Qty & price
1 pc
Sample price
Confirm fit before a run
10–100
Unit price drops
Setup cost shared
500+
Best price
All tiers quoted upfront
- →No distributor — you pay the maker directly
- →CAD saved after first order — reorder anytime at lower unit price