Type 24 Grooved Pins

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Type 24 Grooved Pins

Type 24 Grooved Pins feature three parallel grooves and a pilot extending over one-quarter of the pin length. When shorter grooves and longer bearing areas are required, parallel grooves provide high holding power. A short pilot on the grooved end allows the Type 24 Grooved Pin to enter from either end and permits use in either blind or through holes.

Type 24 Grooved Pins are designed specifically for linkage, pivot, hinge, or axle applications.

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Type 24 Grooved Pins in Stock

Groov-Pin Type 24

Pin Type






Type 24 Part Number           

24 English 1/16 1/4 303 SS Plain G24E-062-0250-500-00-000
24 English 1/16 1/2 303 SS Plain G24E-062-0500-500-00-000
24 English 1/16 1 303 SS Plain G24E-062-1000-500-00-000
24 English 3/32 1/4 303 SS Plain G24E-093-0250-500-00-000
24 English 3/32 1/2 303 SS Plain G24E-093-0500-500-00-000
24 English 3/32 1 303 SS Plain G24E-093-1000-500-00-000
24 English 1/8 1/2 303 SS Plain G24E-125-0500-500-00-000
24 English 1/8 3/4 303 SS Plain G24E-125-0750-500-00-000
24 English 1/8 1 303 SS Plain G24E-125-1000-500-00-000
24 English 5/32 1/2 303 SS Plain G24E-156-0500-500-00-000
24 English 5/32 3/4 303 SS Plain G24E-156-0750-500-00-000
24 English 5/32 1 303 SS Plain G24E-156-1000-500-00-000
24 English 3/16 1/2 303 SS Plain G24E-187-0500-500-00-000
24 English 3/16 1 303 SS Plain G24E-187-1000-500-00-000
24 English 3/16 1-1/2 303 SS Plain G24E-187-1500-500-00-000
24 English 1/4 3/4 303 SS Plain G24E-250-0750-500-00-000
24 English 1/4 1 303 SS Plain G24E-250-1000-500-00-000
24 English 1/4 1-1/2 303 SS Plain G24E-250-1500-500-00-000

What is a Groov-Pin?

A Groov-Pin is a solid cylindrical pin with three longitudinal grooves, manufactured from bar or coil stock. The three
grooves are pressed into the cylindrical body to expand its diameter to a size greater than its nominal diameter in a
precisely controlled way. Material is displaced, but not removed, from the pin in the process.
Type 1 Grooved Pin - Grooved Pins - Fasteners - Manufacturing - Groov-Pin
Why do I need a Groov-Pin? Type 2A Grooved Pin_Grooved Pins_Fasteners_Manufacturing_Groov-Pin
The holding force of a Groov-Pin, with locking forces proportional to the length of the groove engaged, increases until
the groove is fully engaged. Conversely, the holding force of the pin diminishes gradually as the pin is removed. The
Groov-Pin provides excellent holding power in case of severe vibration and shock, even in the case of axial displacement.
Type 3H Grooved Pin_Grooved Pins_Fasteners_Manufacturing_Groov-Pin
How does it work? Type 5 Grooved Pin_Grooved Pins_Fasteners_Manufacturing_Groov-Pin
When a Groov-Pin is pressed into a hole the size of the pin nominal diameter, the constraining action of the hole will compress the expanded material in a spring-like manner and produce a holding force. This unique locking action is accomplished without permanent deformation of either the base material or the pin. Type 24 Grooved Pin_Grooved Pins_Fasteners_Manfacturing_Groov-Pin

Why use Groov-Pins vs. other Grooved Pins?


  • 4x higher pull-out resistance than knurled pins
  • 50% stronger than hollow pins


  • Used in automotive, aerospace, valve coupling, anywhere that reliability is critical
  • Our pins are in every life vest, on every commercial airplane in the U.S.


  • Have a special requirement or need it in 2 weeks? Just ask!
  • We have direct field application specialist to visit and work with you.

 Groov-Pin Locking Forces

Locking forces are created when the pin expanded diameter is compressed in a hole the size of the pin nominal diameter.  Locking forces are created both around the pin diameter and along the pin length in the vicinity of the grooves.

Before Inserting a Groov-Pin After Inserting a Groov-Pin           Distribution of Locking Forces
How Grooved Pins Work_Install Grooved Pins_Before_Fasteners_Manufacturing_Groov-Pin How Grooved Pins Work_Install Grooved Pins_After_Fasteners_Manufacturing_Groov-Pin   Grooved Pin Ditribution Forces_Grooved Pin Locking Force_Fasteners_Manufacturing_Groov-Pin
Inserting a Groov-Pin Removing a Groov-Pin
Insert Grooved Pin_How to Insert Grooved Pins_Fasteners_Manufacturing_Groov-Pin Remove Grooved Pin_How to Remove Grooved Pins_Fasteners_Manufacturing_Groov-Pin

The locking force increases with the length of groove engagement. A fully engaged pin has maximum holding power. Holding power decreases only gradually as the pin is disengaged. As a result, Groov-Pins perform well even in the presence of shock and vibration.

Drilled Hole Tolerances

Hole Tolerances_Grooved Pin Diameters_Grooved Pins_Grooved Pin Installation_Fasteners_Manufacturing_Groov-Pin




Features and Benefits

Grooved Pin Types_Groov-Pin Types_Fasteners_Manufacturing_Groov-Pin

Twice the Shear Strength
The Groov-Pin is a solid metal pin with up to twice the shear strength of a spring pin of the same diameter. The shear resistance of steel Groov-Pins can be 40% higher than that of a heavy-duty spring pin. Groov-Pins also provide a smooth surface around the diameter and uniform diameter along the unexpanded length for better cosmetic appearance and superior performance as an axle or hinge pin. The smooth surface along the unexpanded length and at the ends reduces the accumulation of abrasives and other undesirable materials. The strength of the solid pin body is not orientation dependent, as is the case with some spring pins.


 Important Groov-Pin Advantages

  • They withstand severe shock and vibration
  • They are solid
  • They are available in different grooved types to suit a wider range of applications
  • They require only a straight drilled hole
  • They reduce the number of steps in your assembly operation
  • They may be driven with a hammer, air cylinder or hydraulic press
  • They may be hopper-fed for automatic installation
  • They allow easy installation and quick assembly
  • They can be removed and reused.

Shock and Vibration Resistance
The spring-like locking force created by the Groov-Pin, in a hole the size of the pin nominal diameter, is very resistant to vibration and shock.  In fact, forces greater than the maximum insertion force are required to move a fully engaged pin.  Even in the case of axial displacement, the Groov-Pin retains holding force until it is fully disengaged.

Simple Installation
The Groov-Pin can be driven manually or automatically, by hammer, air cylinder, or hydraulic press.  Also, it is a one-piece retainer.  Simplicity of installation can speed assembly and save labor cost.

 Reduced Manufacturing Demands
Since the tolerance requirements on holes accepting Groov-Pins are relatively loose, demands on the manufacturing process are reduced.  Groov-Pins require only a straight drilled hole.  No reaming, milling or tapping is necessary.

Variety of Applications
Locking depends on the compression of the Groov-Pin itself, rather than the deformation of the base material. Consequently, Groov-Pins are well suited for applications in hardened or unhardened steels, as well as aluminum, brass, and plastics.

 Wide Range of Design Options
The locking properties of grooves can be used with pins made of many different materials, opening a wide range of design options where other material properties, such as conductivity or corrosion-resistance, may be important.
 Design Flexibility
A wide variety of groove types is available to suit almost any application. To provide free rotation services, smooth surfaces for handles, or necks for springs, the groove length can be selected and positioned where needed along the pin. To facilitate automatic insertion or to maximize the holding power of the pin, different shapes may be selected for the groove and the end of the pin.

Removable and Reusable
Properly designed assemblies, locked or aligned with Groov- Pins, can be separated without destroying the pins.  The same pins can be used again with little or no reduction in performance.




Technical Performance

Shear Strength
The Shear Strength Table shows the force required to shear low-carbon steel, corrosion-resistant steel, and heat treated alloy steel Groov-Pins when loaded in double shear using a fixture as described below.

Maximum Torque
If the torque to be transmitted by the shaft is known, the proper diameter pin can be selected from the table. The torque figures are also based on low-carbon steel in double shear and include a safety factor of 8. For other materials, torque figures can be adjusted by multiplying by the ratio of double shear strength of the material to that of low-carbon steel.
Shaft Size
The recommended pin diameters are maximum for a given shaft size and are based on the low-carbon steel pins in double shear.

Horsepower Transmission
The table maximum horsepower which can be transmitted by a shaft to another machine element connected to the shaft by a Groov-Pin under double shear load. The material assumed was low-carbon steel and a safety factor of 8 was used.

Nominal Pin Daim. in. Cross Section Area sq. in. Low-Carbon Steel Pin Double Shear Strength lbs. Corrosion Resistant Steel Pin Double Shear Strength lbs. Alloy Steel Pin (Rockwell C40-48) Double Shear Strength lbs. Shaft Size in. Maximum Torque Low-Carbon Steel Pin in lbs. Hp Transmitted @ 100rmp Low Carbon Steel Pin Hp
1/32 0.0008 100 140 180 3/32 0.5 0.001
3/64 0.0017 220 300 400 9/64 1.9 0.003
1/16 0.0031 400 540 720 3/16 4.7 0.007
5/64 0.0048 620 860 1,120 7/32 8.4 0.014
3/32 0.0069 890 1,240 1,600 1/4 14.0 0.022
7/64 0.0094 1,220 1,680 2,180 5/16 23.8 0.038
1/8 0.0123 1,600 2,200 2,820 3/8 37.4 0.059
5/32 0.0192 2,300 3,310 4,520



3/16 0.0276 3,310 4,760 6,440


116.4 0.185
7/32 0.0376 4,510 6,480 8,770 5/8
1/4 0.0491 5,880 8,460 11,500 3/4
5/16 0.0767 7,660 12,700 17,900 5/16
3/8 0.1140 11,000 18,200 26,000 1-1/8
7/16 0.1503 15,000 24,800 35,200 1-5/16
1/2 0.1963 19,600


46,000 1-1/2 1,836 2.91


Double Shear Test
A double shear test should be performed in a suitable fixture such as the
one shown at the right.  In general, fixture bushings to support the pin and
to apply the shear load must have holes conforming to the requirements
specified for the pin type being tested. These bushings must have a
minimum hardness of Rockwell C58, or equivalent.  The clearance between
the supporting bushing and the loading bushing must not exceed .005”.
The load must be aligned perpendicular to the axis of the pin and the rate
of load application must be less than or equal to .05 inches per minute.  Additionally,
the shear planes must be located at least one pin diameter from
the ends of the pin and must be at least two pin diameters apart.  Pins which
are too short to be tested in double shear are evaluated by testing two pins
simultaneously in a single shear.




Shear Test Fixture
This schematic drawing shows a standard fixture for
performing a double shear test. Hardened bushings
support the sample with holes the size of the pin under
test. The pin is placed in the fixture where a shear load
is applied perpendicular to the pin axis in two places.

Grooved Pin Shear Test_Shear Strength_Grooved Pin Benefits_Fasteners_Manufacturing_Groov-Pin

Standard Sizes

Standard ANSI B 18.8.2
DOD - P - 63464
MS35671 through MS35679

Grooved Pin Standard Sizes_Grooved Pins_Fasteners_Manufacturing_Groov-Pin Grooved Pin Expanded Diameter_Grooved Pins_Fasteners_Manufacturing_Groov-Pin


Pin Type                         
G01    Full-Length Taper E English 100   1215 Carbon Steel 00   Plain
G2A    Half-Length M Metric 101   1117 Steel 01   Phosphate
G3H    Full-Length Parallel   108   12L14 Steel 02  Cadmium, QQ-P-416F
G05    Half-Length Center   400    400 Monel 04  Zinc, ASTM B-633
G24    Quarter-Length Parallel   500   303 Stainless Steel 05  Nickel


  501   316 Stainless Steel 06  Black Oxide
    502   416 Stainless Steel 07  Zinc Chromate, ASTM B-633
    505   302 Stainless Steel 08  Cadmium Chromate, QQ-P-416
    506   304 Stainless Steel 09  Special
    700   6150 Alloy  

Sample Grooved Pin Sizes_Grooved Pin Types_Fasteners_Manufacturing_Groov-Pin

Standard English Pin Dimensions

Standard Grooved Pin Dimensions_Grooved Pin Specs_Grooved Pins_Fasteners_Manufacturing_Groov-Pin
* Pins in 1/32" and 3/64" diameter of any length and all sizes 1/4" nominal length or shorter are not crowned or chamfered.
Alloy steel pins of all types have chamfered ends.
Tabulated dimensions and tolerances apply to the pins prior to applications of plating or other coating.

Extended Diameters
Groov-Pin Extended Diameters Chart
1 For groove lengths not shown use expanded diameters given for the next longer tabulated groove length.
2 Expanded diameters for stainless steel and Monel can be found by reducing the value in the table by the amount in the last row.

Weight per 100 Pieces
Grooved Pin Weight_Buy Grooved Pins_Fasteners_Manufacturing_Groov-Pin
Highlighted areas indicate standard ANSI sizes and lengths of Groov-Pins.
1 Pin length for crown pins is (L+2F), Pin length for chamfered pins is (L).
2 Weights are estimates for steel pins.  For stainless steel multiply by 1.01 and for Monel multiply by 1.12.


Designing with Groov-Pins

Hinge and Axle Designs
Groov-Pins are widely used in hinge and axle applications where
the grooved section locks the pin in place and the ungrooved
portion of the pin becomes the bearing surface.  By choosing
an appropriate type, the pin may be captured at the end or
in the center.  If the pin is to be captured in the center, it is
recommended that the hole size in the center element be the
nominal diameter of the pin and that the center element contain
a length of pin equal to at least two pin diameters.  The yoke
should avoid the grooves which extend along the central portion
of the pin.  If the pin is captured at the end, it is recommended
that the yoke members be at least one pin diameter thick and
that the center element avoid grooves near the end.

 Grooved Pins_Grooved Pin Types_Buy Grooved Pins_Fasteners_Manufacturing_Groov-Pin
Shaft-Locking Pin Designs
A hole in a shaft should not exceed one third of the shaft
diameter, or otherwise the shaft becomes too weak.  Pin
material and diameter should be selected so that the pin
will shear before the shaft fails.  When using the shear
strength data in this brochure, remember that the shaft
diameter must be at least two pin diameters and that the
pin must extend at least one pin diameter from the shaft.
A safety factor of 8 has been assumed.
Engineering Support
Groov-Pins are engineered fasteners which play an important
role in assembly design.  Whether a pin of standard design is
needed or one with special requirements, take advantage of
the Customer Service Engineering Department.  This responsive
group of problem solvers is available to discuss special design
needs and to help select the proper pin type for an application.
Together with the factory-trained direct sales force, they form
an experienced team to provide support through the entire
design cycle.
Grooved Pin Inspection_Groov-Pin Quality_Grooved Pins_Fasteners_Manufacturing_Groov-Pin

Samples for Testing
No engineering design is complete without evaluating the
application whit the actual pin or an equivalent substitute.
Customer Service Engineering is available to help define and
obtain samples for test and evaluation.

Special Requirements
Special design requirements will be reviewed promptly by our
engineers to provide feedback and recommendations.  Contact
Customer Service Engineering with any questions concerning
alternate materials, finishes, straightness, or end configuration
requirements.  For a detailed discussion, a print can be faxed to
us at (201) 945-8998.