Products - Pins Index - Grooved Pins
Grooved Pins
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Grooved Pins are manufactured in the range of 1.6mm to 16mm in diameter and 5mm to 150mm lengths. They are manufactured to different standards to suit individual requirements. The grooved Pins are having three equi-spaced longitudinal grooves. They are rolled or pressed into the cylindrical body to deform the pins resists loosening from shock or vibrations and may be reused without appreciably reducing the holding force. Grooved pins are reported to reduce Cost, Time & Energy as it makes assembly simpler and faster. They are manufactured from C-40 (EN - 8) material in soft condition and natural finish. It can also be manufactured as per customer requirement. A few of them are illustrated below:

  • DIN - 1472, IS : 7385, ISO : 8745
  • DIN - 1471, IS : 7368, ISO : 8744
  • DIN - 1473, ISO : 8740
  • DIN - 1474, IS : 7386, ISO : 8741
  • DIN - 1470, IS : 7384, ISO : 8739
  • DIN - 1469, IS : 6862, ISO : 2340
  • DIN - 1475, IS : 7385, ISO : 8742
  • DIN - 1476, ISO : 8746
Technical Data
Amount of standard Bulge Out

Tolerance on ungrooved portion :
Pin from 1.5 to 3 mm .. h9
Pin from 4 to 6 mm . ....h11

Diameter over Grooving is checked by Ring Gauge. Tolerance on bulgue out :
From 1.5 mm ........... 0.05
From 2 to 6 mm ............ 0.05

Tolerances on hole to which these Pin are suitable:
Up to 3mm diameter .....h9
From 3 to 6 mm h11

Nominal Diameter Bulge Out
1.5 0.1
2 0.15
2.5 0.15
3 0.2
4 0.25
5 0.25
6 0.3

To Order, indicate Dia of the Hole x Length, e.g SPRING DOWEL SLEEVES for Norm. Dia of Hole 4 mm x Length 28 mm order as SPRING DOWEL SLEEVES 4 mm x 28 mm DIN-1481/IS-5988 LIGHT

Grooved Pins and Studs

The groove of a grooved pin is formed by a swaging operation in which three tools penetrate the nominal diameter of the metal at 120 intervals. This penetration displaces a controlled amount of metal to each side of the grooving tool, forming a raised portion along the side of each groove.

The crest of these raised portions forms the expanded diameter or "Dx" dimension which is shown in Figure 1. The Dx is a few thousandths larger than the nominal diameter "D" of the pin. The amount of expansion varies with the diameter of the pin, the material being grooved, and the style of groove.


When a grooved pin is used, the hole into which the pin is to be inserted is drilled a few thousandths larger than the nominal diameter of the pin. The hole must never be smaller than the nominal diameter of the pin. (See: Grooved Pin Drilling Procedures and Hole Tolerances).

When the expanded portion of the pin is compressed by insertion into the hole, radial holding forces are generated as shown in Figure 2. These radial forces lock the pin securely into the drilled hole.

  • The Type A Pin has three full-length tapered grooves. This popular type is used in applications requiring excellent locking effect and ease of assembly. It is widely used in place of taper pins, rivets, set screws and keys. Typical applications include keying sprockets, gears, collars, knobs, handles, levers and wheels to shafts.
  • The Type C Pin has three parallel grooves extending one-quarter its overall length. It is ideally suited for linkage or pivot applications, especially where a relatively short locking section and longer free length are required. Widely used in certain types of hinge applications. The long lead permits easy insertion.
  • Type E has three parallel half-length grooves located equidistant from each end. Widely used as T handle on valves and tools. Also used as a cross pin, cotter pin, pivot pin, etc., where center locking is required.

  • Type G has three parallel half-length grooves including pilot. It is a very versatile pin, suitable for use in both blind and through holes as a spring anchor pin. The annular groove opposite the locking end is used to anchor the end loop of a tension spring. If snap or retainer rings are to be used, special section annular grooves can be machined to order.

  • Type H grooved pin has three parallel grooves for half the length of the pin. This type of pin may be used as a pivot, stop or hinge pin. When pressed in place, the grooved portion locks in one part while the ungrooved section remains free to serve as the locator, hinge, etc.

  • Type U has three parallel grooves extending the full length of the pin. A short pilot at each end permits hopper or automatic feeding. Identical ends speed manual insertion as operator need not examine pin to determine proper end to start. Full length parallel grooves provide maximum locking effect. Typical applications include keying gears, collars, knobs, handles, etc., to shafts.

*Length increments are by 1/8 inch up to 1 inch, and by inch over 1 inch. Standard availability may vary depending upon groove type. The length of chamfered pins is measured overall from end to end. The overall length of crowned pins is measured at L 2E. End configuration may vary depending upon pin length and groove type. All dimensions apply prior to plating.

On Nominal Diameter "D":
.000/-.0015 up to 7/64" diameter
.000/-.002 7/64" diameters and over

On overall Length "L":
.010 for all diameters

For stainless steels and other special materials, the expanded diameters shown in the table are reduced by amounts shown at left.

Note: Intermediate pin lengths, pin diameters up to 3/4", groove lengths, and special groove positions are ordered as specials.

Checking Expanded Diameters
As shown, expanded diameters cannot be accurately measured using a micrometer. For accurate measurement of expanded diameters, use a class Z ring gage only!
Grooved pin Drilling Procedures and Hole Tolerances

Insertion and holding forces vary with hole size and groove length. Recommended hole size tolerances are based on a groove length to hole diameter ratio of approximately 5 to 1. A higher ratio than 5 to 1 may require adjustment in hole size. If the ratio is 1 to 1 or less then the hole tolerance should be reduced approximately 60%. Smaller hole size variation should result in more consistent insertion forces. These factors should be considered when designing press fit fasteners for your application.

Hole sizes should never be smaller than the nominal diameter of the grooved pin. Minimum hole size equals nominal grooved pin diameter. Maximum hole size equals minimum hole size plus recommended hole tolerance from the chart.

1/8 diameter pin: Min. hole = .125,
Max. hole = .125 .003 =.128
A slight chamfer on the hole is recommended particularly with holes in hardened steel, cast iron, and with hardened grooved pins.

  • Type D has three reverse taper grooves extending one-half the length of the pin. Recommended for use in blind holes as a top pin, roller pivot, dowel, or for certain hinge or linkage applications. Reverse taper grooves permit easy insertion in blind holes.
  • Type B Pins have three tapered grooves extending one-half the length of the pin. This type is widely used as a hinge or pivot pin. Driven or pressed into a straight drilled hole, the grooved portion locks in one part, while the ungrooved portion will remain free. Also excellent for dowel and locating applications.
  • ype A3 Pins have three full-length parallel grooves with a short pilot to insure easy starting. They are recommended for applications requiring maximum locking effect where severe vibration and/or shock loading are present.
Typical Groove Configurations
Choice of end configuration
Typical Applications
  • Material Handling Equipment
    The Type E pin provides positive locking with a half-length groove in the center of the pin. Extreme shear is exerted in this application, yet the Pin is used with complete safety for both men and materials. Type is a special pin.
  • Material Handling Equipment
    Type Pin as specified for this application to give maximum locking power over the entire pin and gear hub area. The Type A Pin, with grooves the full length of the pin, is the standard stock pin which meets most applications.
  • Material Handling Equipment
    Special Type was selected as a shaft in this transmission servo to replace a cross drilled shaft with a cross pin for holding shaft in position. This eliminated a costly drilling operation and the cross pin.
  • Material Handling Equipment
    Special Type Pin with center grooves eliminates costly staking and grinding operations and improves product appearance. This pin is easily installed, fits flush and permits plating before assembly.
  • Material Handling Equipment
    Type C pin, with quarter-length grooves, provides maximum ease of assembly. There is no interference until three-fourths of the pin is in position. The high safety factor inherent in Pins makes them practical and efficient for such constant shear applications. Type is a special pin.
  • Material Handling Equipment
    Type B Pin was used here because the half length grooves simplified the job of starting the pin into the hole. Ease of assembly was matched with sufficient locking power even when subjected to continuous, strong reciprocating forces. Type is a special pin.

Grooved studs have three parallel grooves spaced at 120 intervals around the diameter of the shank. Standard grooved studs are manufactured from low carbon-steel and are zinc- plated for corrosion


Grooved studs function in the same manner as grooved pins. They provide the same positive holding features as grooved pins plus additional end loading resistance provided by the head of the stud.

Special Studs
Standard Studs

Standard studs are manufactured to ASME B18.8.2 specifications. Standard stud sizes available are from #0 through #16 and lengths from 1/8" through 3/4" as shown in the table below.

Special Studs

In addition to standard round head grooved studs, flat heads, button heads, and T-heads are also available by special order. PV's engineering staff will work with customers to provide technical assistance. Special materials, diameters, shank lengths, end configurations, and finishes are available by request as special orders.