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Pins · ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745 · Application guide

What Are Grooved Pins, Taper and Center-Groove Types Used For?

Typical applications, the industries that specify grooved pins, taper and center-groove types, and how to choose the right size, material and finish for the joint.

Grooved Pins, Taper and Center-Groove Types are used for solid grooved pins with half-length reverse taper, center and taper grooves. They are manufactured to ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745, and selection is driven by the nominal diameter, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Solid grooved pins with half-length reverse taper, center and taper grooves
Governing standard
ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
Nominal diameter range
1.5 mm to 25 mm
Category
Pins

Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation.

What Are Grooved Pins, Taper and Center-Groove Types Used For? application image

Grooved Pins, Taper and Center-Groove Types are selected when an assembly calls for solid grooved pins with half-length reverse taper, center and taper grooves. This application guide to the ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745 type covers concrete end-uses, the specification checklist, correct installation, and where an alternative fastener performs better. Stocked across roughly 1.5 mm to 25 mm, they cover general to heavy-duty work.

Typical Applications for Grooved Pins, Taper and Center-Groove Types

The most common settings where these are specified:

  • Automotive: hinge and lever pins.
  • Appliances: shafts and pivots.
  • Mechanisms: gear and hub fixing.
  • Consumer goods: press-fit shafts.

How to Specify Grooved Pins, Taper and Center-Groove Types for Your Application

  • Size: Select on nominal diameter, then on the hole tolerance and fit class — the fit, not the diameter alone, determines whether the part locates or slips. This product spans 1.5 mm–25 mm; check the full table below for the exact dimensions of each size.
  • Material: Choose the material and finish for the service environment — plated steel for general use, stainless for corrosion resistance.
  • Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
  • Standard: This product is supplied to ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Installation & Assembly Practice

  • Ream the hole to the specified fit class; a dowel pressed into a drilled-only hole will not locate accurately.
  • Press pins in with steady force rather than hammer blows where possible, and chamfer the hole entry.

Common Selection Mistakes with Grooved Pins, Taper and Center-Groove Types

  • Using a dowel pin as a load-carrying shear bolt — dowels locate, they are not sized for sustained shear.
  • Ignoring the fit class: a locational fit and an interference fit need different hole tolerances.

Where Grooved Pins, Taper and Center-Groove Types Are Not the Right Choice

Not for carrying significant tensile or repeated heavy shear loads — use a bolt or a keyed joint for that.

Custom manufacturing · Made to drawing

Need a grooved pins, taper and center-groove types outside the standard range?

Tolerance class is what a special pin usually turns on — a locating pin and a retaining pin want very different fits in the same nominal size. Made by cold heading or turning.

Minimum order from 2,000 pieces; samples within 7 days of drawing approval.

Custom pin manufacturingSend a drawing

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Dimensioned line drawing of 1.5 mm Grooved Pins, Taper and Center-Groove Types to ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.
Type
Half-length reverse taper grooved pins
d_1 (mm)
1.5
a (mm)
0.2
Length range l (mm)
8~20
Sends the selected values to the quote form below.

Request a Quote

The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.

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Specification
Business Information

Dimensions & Specifications (ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745)

Nominal diameter d (mm)Typed_1 (mm)a (mm)d1 (mm)Length range l (mm)Reference standard
1.5 mmHalf-length reverse taper grooved pins1.50.28~20ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
2 mmHalf-length reverse taper grooved pins20.258~30ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
2.5 mmHalf-length reverse taper grooved pins2.50.38~30ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
3 mmHalf-length reverse taper grooved pins30.48~40ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
4 mmHalf-length reverse taper grooved pins40.510~60ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
5 mmHalf-length reverse taper grooved pins50.6310~60ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
6 mmHalf-length reverse taper grooved pins60.812~80ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
8 mmHalf-length reverse taper grooved pins8114~100ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
10 mmHalf-length reverse taper grooved pins101.218~160ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
12 mmHalf-length reverse taper grooved pins121.626~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
16 mmHalf-length reverse taper grooved pins16226~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
20 mmHalf-length reverse taper grooved pins202.526~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
25 mmHalf-length reverse taper grooved pins25326~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
1.5 mmThird-length center grooved pins1.50.28~20ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
1.5 mmHalf-length center grooved pins1.50.28~20ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
2 mmThird-length center grooved pins20.2512~30ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
2 mmHalf-length center grooved pins20.2512~30ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
2.5 mmThird-length center grooved pins2.50.312~30ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
2.5 mmHalf-length center grooved pins2.50.312~30ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
3 mmThird-length center grooved pins30.412~40ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
3 mmHalf-length center grooved pins30.412~40ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
4 mmThird-length center grooved pins40.518~60ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
4 mmHalf-length center grooved pins40.518~60ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
5 mmThird-length center grooved pins50.6318~60ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
5 mmHalf-length center grooved pins50.6318~60ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
6 mmThird-length center grooved pins60.822~80ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
6 mmHalf-length center grooved pins60.822~80ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
8 mmThird-length center grooved pins8126~100ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
8 mmHalf-length center grooved pins8126~100ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
10 mmThird-length center grooved pins101.232~160ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
10 mmHalf-length center grooved pins101.232~160ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
12 mmThird-length center grooved pins121.640~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
12 mmHalf-length center grooved pins121.640~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
16 mmThird-length center grooved pins16245~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
16 mmHalf-length center grooved pins16245~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
20 mmThird-length center grooved pins202.545~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
20 mmHalf-length center grooved pins202.545~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
25 mmThird-length center grooved pins25345~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
25 mmHalf-length center grooved pins25345~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
1.5 mmFull-length taper grooved pins1.50.28~20ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
2 mmFull-length taper grooved pins20.258~30ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
2.5 mmFull-length taper grooved pins2.50.38~30ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
3 mmFull-length taper grooved pins30.48~40ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
4 mmFull-length taper grooved pins40.58~60ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
5 mmFull-length taper grooved pins50.638~60ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
6 mmFull-length taper grooved pins60.810~80ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
8 mmFull-length taper grooved pins8112~100ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
10 mmFull-length taper grooved pins101.214~120ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
12 mmFull-length taper grooved pins121.614~120ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
16 mmFull-length taper grooved pins16224~120ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
20 mmFull-length taper grooved pins202.526~120ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
25 mmFull-length taper grooved pins25326~120ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
1.5 mmHalf-length taper grooved pins0.21.58~20ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
2 mmHalf-length taper grooved pins0.2528~30ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
2.5 mmHalf-length taper grooved pins0.32.58~30ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
3 mmHalf-length taper grooved pins0.438~40ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
4 mmHalf-length taper grooved pins0.5410~60ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
5 mmHalf-length taper grooved pins0.63510~60ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
6 mmHalf-length taper grooved pins0.8610~80ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
8 mmHalf-length taper grooved pins1814~100ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
10 mmHalf-length taper grooved pins1.21014~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
12 mmHalf-length taper grooved pins1.61218~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
16 mmHalf-length taper grooved pins21626~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
20 mmHalf-length taper grooved pins2.52026~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
25 mmHalf-length taper grooved pins32526~200ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745
Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

  1. Wire rod feeding into a cold heading machine
    01

    Cold heading

    Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.

    Head dimensions and under-head radius checked at set-up and per shift.

  2. Thread rolling machine producing bolt threads
    02

    Thread rolling

    Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.

    Go / no-go ring gauges to ISO 965 tolerance class 6g.

  3. Baskets of bolts staged for heat treatment
    03

    Heat treatment

    Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.

    Core hardness and tensile tested per lot to ISO 898-1.

  4. Zinc plated bolts in a treatment basket
    04

    Surface treatment

    Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.

    Coating thickness and neutral salt spray hours to ISO 9227.

Frequently Asked Questions

What material should Grooved Pins, Taper and Center-Groove Types be for outdoor use?

For damp, coastal or chemical environments specify A4 (316) stainless or a suitably coated steel. For indoor or dry use, A2 (304) stainless or zinc-plated steel is normally adequate.

Are Grooved Pins, Taper and Center-Groove Types made to a recognized standard?

Yes — they are manufactured to ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745, so dimensions are interchangeable between suppliers when you quote the standard on your order.

What are Grooved Pins, Taper and Center-Groove Types used for?

Solid grooved pins with half-length reverse taper, center and taper grooves. They are supplied to ISO 8741 / ISO 8742 / ISO 8743 / ISO 8744 / ISO 8745.

Which industries use Grooved Pins, Taper and Center-Groove Types?

They are commonly specified in consumer goods, automotive and appliances, among other sectors.

Can I get a quote for Grooved Pins, Taper and Center-Groove Types in the size and material I need?

Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time.