Spring Pins — Slotted & Coiled

Product detail · Updated 6 October 2026

Product and application brief

Spring pins are hollow pin fasteners whose rolled construction differs from solid dowel pins. The two principal forms are slotted and coiled. Specify the construction as well as the size: a family name or nominal diameter alone does not identify the required part.

Product forms and reference names

Product form / field	Reference and distinguishing details
Slotted, heavy duty — ISO 8752:2009	The official ISO catalogue identifies the heavy-duty slotted family under this reference. Confirm the selected edition and geometry rather than using a generic roll-pin name.
Slotted, light duty — ISO 13337:2009	This reference identifies light-duty slotted pins. Light and heavy duty are distinct specifications, not interchangeable labels for a single nominal diameter.
Coiled, standard duty — ISO 8750:2007	This reference identifies the standard-duty coiled family. Keep the coiled construction and duty in the line-item description.
Coiled, heavy duty — ISO 8748:2007	This reference identifies heavy-duty coiled pins, separately from both standard-duty coiled and heavy-duty slotted pins.
Coiled, light duty — ISO 8751:2007	This reference identifies light-duty coiled pins. Use the exact reference or controlled drawing when requesting this form.
Manufacturer-specific or drawing-defined form	A maker's own slotted design can differ in slot and end geometry from an ISO-listed form. Retain the actual part number or drawing; do not turn a third-party name into a FastenerBridge brand or conformity claim.

Recognize the cross-section

A slotted pin is a single-wall tube with a C-shaped end and an axial opening. A coiled pin has multiple wraps of flat strip visible at its end, not a helical wire compression spring. The illustration on this page shows slotted construction only; it does not show all duties or coiled variants.

Names that need clarification

Roll pin and tension pin are common search terms for spring pins, but informal names are not a controlled specification. In some catalogues split pin also refers to a slotted spring pin; the separately listed split/cotter pin with two legs is a different structure. Identify the cross-section or attach the drawing to avoid that ambiguity.

Nominal, free-state and mating-hole dimensions

Record the nominal size separately from the specified free-state outside diameter and the mating-hole requirements. State the inspection condition for each diameter on the drawing. Do not infer an approved hole size, fit, insertion force or installed condition from the nominal size or reference image.

Duty and assembly requirements

Keep construction and duty as separate fields. Provide the mating-part drawing, hole arrangement and engagement requirements so the selected part can be reviewed against the intended assembly. A heavy-duty name does not establish a permitted load, and a change of duty or construction is not automatically an accepted substitute.

Reference scope and unresolved requirements

The listed ISO references were checked for family identity and edition only; full normative dimension, tolerance and material tables were not verified. DIN, EN and ASME interchangeability and actual production conformity are not asserted. Exact geometry, inspection criteria and any application-specific acceptance remain tied to the chosen specification or approved drawing.

Specification fields

Product form / field	Reference and distinguishing details
Identity and units	Slotted/coiled, duty, exact standard and edition or drawing/part number; specify mm or inch.
Diameter and condition	Nominal diameter plus specified free-state diameter and its tolerance/measurement condition, where required.
Length and end geometry	Drawing-defined length and tolerance; chamfer, edge and end requirements without assumed universal values.
Mating holes and engagement	Hole drawing with diameter, tolerance, alignment and engagement requirements; keep pin and hole dimensions separate.
Construction details	Slotted wall/slot or coiled cross-section requirements from the selected reference, including any special drawing-defined features.
Material and finish	Exact material designation, required condition, finish and inspection requirements; appearance is not hardness or corrosion evidence.
Quantity and documentation	Pieces for each construction/duty/size; drawing revision, inspection/traceability and packing requirements.
Unresolved items	List missing reference, measurement condition, hole details or acceptance criteria for confirmation rather than assuming them.

Common product questions

Are slotted and coiled spring pins the same product?

No. Slotted pins have a C-shaped wall and longitudinal opening; coiled pins have wrapped-strip cross-sections. Select the intended construction and duty, not just a common roll-pin name.

Is nominal diameter the measured free-state outside diameter?

Do not assume so. State the nominal size, specified free-state diameter and its inspection condition separately from the mating-hole dimensions. The selected reference or drawing defines the applicable values.

Can a heavy-duty pin replace a light-duty pin of the same nominal size?

Not automatically. Construction, duty, geometry and mating-part requirements must be reviewed together. This page does not prescribe a substitute, installation force or load rating.

Related specification resources

Product references

References checked 6 October 2026 explain product identity. Third-party model names and approvals are not FastenerBridge brand affiliation, stock or certification claims. Final geometry and requirements follow the selected specification.