Pins
Dowel Pins & Cotter/Split Pins Manufacturer, Wholesaler, Supplier & Exporter
Dowel pins provide precise alignment between mating parts, while cotter (split) pins secure castellated nuts and clevis joints against loosening. We manufacture and export both to DIN and ISO standards in steel and stainless steel.
Dowel pins and cotter pins solve opposite problems and get confused surprisingly often by buyers new to precision hardware: a dowel pin's entire job is to NOT move, locating two parts to each other with an interference fit ground to tight tolerance, while a cotter pin's entire job is to be removable, securing a castellated nut or clevis joint against loosening without needing tools beyond a pair of pliers.
Dowel pin tolerance classes matter more than the nominal diameter suggests. A standard h8 tolerance dowel pin gives a reliable interference fit in a reamed hole for most jig and fixture work, but precision mold and gauge applications sometimes specify tighter m6 tolerance pins — mixing the two in a kit assumes an interchangeability that doesn't actually exist.
Minimum Order — Container Quantity (Approx.)
A standard 20ft container (~20 tons) typically holds 2-3 million pieces of dowel or cotter pins in common sizes. Exact quantity depends on diameter and length and is confirmed at quote time.
You don't need a full container to order. Hurain Engitech & Trade — the group Global Fasteners Exports operates under — regularly ships smaller, partial-container (LCL) orders of just a few pallets or boxes for buyers who don't yet need FCL volume, consolidated with other cargo to keep freight cost reasonable.
Specifications
Standards
DIN 7 / ISO 2338 (parallel dowel pins), DIN 1481 (spring/roll pins), DIN 94 / ISO 1234 (cotter/split pins).
Size range
1mm to 50mm diameter dowel pins; 1mm to 10mm cotter pins.
Types
Parallel dowel pins, tapered dowel pins, spring (roll) pins, split cotter pins.
Finish
Hardened and ground (dowel pins), plain or zinc plated (cotter pins).
Applications
Precision assembly & jigs
Locating pins for tooling, fixtures, and mold components.
Castellated nut locking
Cotter pins securing wheel-bearing and clevis-pin assemblies.
Machine alignment
Dowel pins aligning gearbox and housing components.
Materials Available
Steel
Corrosion-resistant
Dowel pin diameters are ground to tight tolerance (h8) for interference-fit alignment; cotter pins are checked for consistent leg spread strength.
How We Manufacture & Export This Product
- 1
Spec confirmation
Confirm pin type, diameter tolerance, and length.
- 2
Turning & grinding
Precision turning and centerless grinding for dowel pins.
- 3
Heat treatment
Hardening for dowel pins to resist wear at the fit surface.
- 4
Export packing
Small-parts packing suited to OEM assembly lines.
Export Track Record
Supplied to precision machinery and automotive component manufacturers.
Real-World Use Cases
Jig and fixture alignment
Precision dowel pins locating tooling components to each other repeatably.
Castellated nut retention
Cotter pins securing wheel-bearing and steering linkage castellated nuts against loosening.
Gearbox and housing alignment
Dowel pins ensuring housings and covers reassemble in exactly the same position every time.
Common Mistakes Buyers Make
Mixing dowel pin tolerance classes
h8 and m6 tolerance pins aren't interchangeable in a precision fit, even at the same nominal diameter.
Reusing a cotter pin after removal
Once bent and straightened, a cotter pin's legs are weakened — always replace with a new pin, not the same one reinstalled.
Under-sizing a dowel pin for a repeated-disassembly joint
Frequent removal and reinsertion wears an interference fit over time — a slightly larger pin or a bushed hole extends service life.
Glossary of Terms
- Interference fit
- A fit where the pin is slightly larger than the hole, relying on elastic deformation to stay in place without a mechanical lock.
- h8 tolerance
- A standard dimensional tolerance grade for dowel pins, giving a reliable but not ultra-precision interference fit.
- Castellated nut
- A nut with slots cut into one face, allowing a cotter pin to pass through and lock it against a drilled bolt or axle.
Quality Inspection We Perform
Dimensional inspection
Thread gauge, length, diameter, and head/drive geometry checked against the specified standard.
Material verification
Grade and material composition confirmed against the order specification, with mill test certificates on request.
Mechanical testing
Tensile strength, hardness, and proof-load testing on sample batches, particularly for structural and high-tensile grades.
Finish & coating check
Plating thickness, galvanizing coverage, or passivation quality inspected before packing.
HS Code & Customs Classification
Most fasteners fall under HS Chapter 73 (articles of iron or steel) or Chapter 74/76 for brass and aluminum items — the exact 8-10 digit subheading depends on the specific product and material. We include the HS code on the commercial invoice; confirm the applicable import duty with your customs broker, since rates vary by country and trade agreement.
Packaging & Export Labeling
Export packing is chosen to survive ocean freight and container loading without corrosion or damage: corrosion-protected paper or oil coating where needed, then cartons, drums, or bulk bags, palletized or crated for the container. We can match specific labeling, barcoding, or carton-marking requirements for OEM and repeat buyers.
Countries We Export Dowel Pins & Cotter Pins To
View all markets →Buying guide
How to Choose a Reliable Dowel Pins & Cotter Pins Manufacturer, Wholesaler, Supplier & ExporterTwo fasteners that solve opposite problems but get confused often — what to verify before ordering precision dowel pins or safety-critical cotter pins.
Frequently Asked Questions
Related Products
Ready to order Dowel Pins & Cotter Pins?
Send your quantities, grade, standard, and destination port for a quote.