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Solid Pins

Knurled Solid Pins

SPIROL's Knurled Pins are manufactured with two different knurl types: straight knurls and helical knurls.  Unlike a Straight Pin, where retention is provided by the uniform interference between the pin and hole, Knurled Pins are designed to cut into the host.  The displacement of the host material into the valleys of the knurls yields more frictional contact area between the Knurled Pin and hole; thus resulting in higher retention.  Solid Pins with retention features such as knurls and barbs allow for wider hole tolerances than Solid Pins without retention features (i.e. Straight Pins).

Straight Knurled Pins have lower insertion forces than Helical Knurled Pins and offer resistance to turning within the assembly.  However, Straight Knurled Pins provide limited retention when axially loaded.  Therefore, straight knurls are often recommended when the Knurled Pin is used to transmit torque such as when used as an axle to rotate a wheel.

With Helical Knurled Pins, a 30° helical knurl causes the pin to rotate as it enters the hole creating more surface contact with the host than straight knurls.  This results in higher frictional forces, greater engagement and improved resistance to back out.

If installation equipment is required, SPIROL also offers a standard comprehensive line of Pin Installation Equipment from manual to fully automatic modules, with or without out fixturing, to support your Solid Pin assembly requirements.

Application Engineering Assistance: If you would like assistance in selecting the proper Solid Pin - including determining the recommended hole size, tolerance and installation method - please Request Engineering Support!  We are here to help!

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Knurled Pins Product Types

SPIROL Standard Knurled Pins include: Series KP200 Straight Knurled Pins, Series KP300 Helical Knurled Pins and the headed Series FH200 Headed Straight Knurled Pins, Series FH300 Headed Helical Knurled Pins.

(KP200)

Straight Knurled Pin

SPIROL's KP200 Straight Knurled Pins have straight knurls that span the full length of the pin. Straight Knurled Pins are commonly used in applications where the pin is subjected to rotational forces to transmit torque as well as to resist rotational movement of a mating component. KP200 Straight Knurled Pins are available in metric diameters ranging from 2.5mm to 6mm and in inch diameters ranging from .094" (3/32) to .250" (1/4) in low carbon steel and austenitic stainless steel.

(KP300) 

Helical Knurled Pin

SPIROL's KP300 Helical Knurled Pins have helical knurls that span the full length of the pin. The 30° helical knurls cause the pin to rotate during installation into the hole. Helical Knurled Pins offer higher insertion and retention than Straight Knurled Pins. However, KP300 Helical Knurled Pins are not typically recommended when the pin will be subjected to rotational forces as the helical knurl will cause the pin to either "unscrew" itself from the hole or further imbed itself into the hole. KP300 Helical Knurled Pins are available in metric diameters ranging from 2mm to 6mm and in inch diameters ranging from .078" (5/64) to .250" (1/4) in low carbon steel and austenitic stainless steel.

(FH200) 

Headed Straight Knurled Pin

SPIROL's FH200 Headed Straight Knurled Pin has the same body style as the KP200 Straight Knurled Pin, with the addition of a head. A Headed Pin is typically used to provide a positive stop or to retain a thin component to a thicker component within an assembly. FH200 Headed Straight Knurled Pins have a flat head, however they are available to order with a round head (RH200) to meet specific application requirements. Similar to the SPIROL Series KP200 Straight Knurled Pin offering, SPIROL's Series FH200 Headed Straight Knurled Pins are available in metric diameters ranging from Ø2.5mm to Ø6mm and inch diameters ranging from Ø.094" (3/32) to Ø.250" (1/4) in low carbon steel and austenitic stainless steel.

(FH300) 

Headed Helical Knurled Pin

SPIROL's FH300 Headed Helical Knurled Pin has the same body style as the KP300 Helical Knurled Pin, with the addition of a head.  A Headed Pin is typically used to provide a positive stop or to retain a thin component to a thicker component within an assembly.  FH300 Headed Helical Knurled Pins have a flat head, however they are available to order with a round head (RH300) to meet specific application requirements.  Similar to the SPIROL Series KP300 Helical Knurled Pin offering, SPIROL's FH300 Headed Helical Knurled Pins are available in metric diameters ranging from Ø2mm to Ø6mm and inch diameters ranging from Ø.078" (5/64) to Ø.250" (1/4) in low carbon steel and austenitic stainless steel.

Additional Solid Pin Types

Straight / Dowel Pins
Straight / Dowel Pins
Barbed Pins
Barbed Pins
Application Specific Solid Pins
Application Specific Solid Pins
Additional Solid Pin Options
Additional Solid Pin Options

Customizable Solutions

If you are unable to find the Knurled Solid Pin in the diameter, length, material, or finish that you require within our standard offering, or if you are unsure what type of pin is most appropriate for your assembly, Request Engineering Support and we will help you select the most cost-effective solution for your application.

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Your Total Assembly Solution

Installation Technology for Pins

In addition to a comprehensive line of engineered components used for joining and assembly, SPIROL also offers a full range of Pin Installation Equipment designed to facilitate cost-effective and high quality assembly of your products. Our installation solutions range from manual machines to fully automatic work cells with statistical process control and error-proofing options. We are the only company of our kind that offers the total integrated solution.

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Local Design, Global Supply.

SPIROL has Application Engineers throughout the world to assist you in your designs, supported by state-of-the-art manufacturing centers and worldwide stocking facilities to simplify the logistics of delivering your product.

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Frequently Asked Questions

When should I use a Solid Pin instead of a Coiled Pin or Slotted Pin?
Unlike Coiled Pins and Slotted Pins, Solid Pins are permanent fasteners. While more than one type of pin may meet certain requirements, here are some general guidelines when a Solid Pin may be the best option: When a head is required for a positive stop or to retain a thin member to a thicker member of the assembly. When a smooth, uninterrupted surface is required such as when used in conjunction with a pawl or other angular component. When a hollow pin is not suitable such as when the designer is looking to plug a hole (i.e. Restrict passage of liquids). When there is a need to manually align several clearance holes. When increased bending or shear strength is required. When precise hole locations need to be maintained. They are also conducive to automated installation and commonly used to replace screws.
How does SPIROL manufacture Solid Pins?
The two common manufacturing methods used to produce Solid Pins are cold heading and machining. SPIROL uses both technologies, but cold heading technology is used to produce our standard product offering. Cold heading is the preferred manufacturing method for the vast majority of applications because it is scrap-less and significantly less expensive than machining at high volumes (> 50,000 pcs). For more information, read this White Paper: The Difference Between Cold Headed and Machined Solid Pins.
How do I know whether to use a dowel/straight pin or a pin with features like knurls or barbs?
Dowel Pins / Straight Pins are commonly used as axles or hinges. Conversely, features like knurls and barbs provide the mechanism to retain the pin in one or more components. Manufacturers should consult with pinning experts at the early stages of their product design to ensure the optimal pin is selected. If you would like SPIROL's Applications Engineers to review your application, contact us at any one of our Global Locations or fill out this form and one of our Pinning Specialists will contact you shortly after we receive your application information.
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