Type 3H Part Number
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.
|Why do I need a 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.
|How does it work?|
|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.|
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|
|Inserting a Groov-Pin||Removing a 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
Features and Benefits
Twice the Shear Strength
Important Groov-Pin Advantages
Shock and Vibration Resistance
| 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
| 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
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.
The recommended pin diameters are maximum for a given shaft size and are based on the low-carbon steel pins in double shear.
|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|
Double Shear Test
Shear Test Fixture
Standard ANSI B 18.8.2
DOD - P - 63464
MS35671 through MS35679
|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|
Standard English Pin Dimensions
* 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.
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
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
|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.
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
Samples for Testing