FAQ

  1. What is a spring pin?
  2. What do the terms Light Duty, Standard (Medium) Duty, & Heavy Duty mean?
  3. What is the difference between the duty classifications of coiled spring pins?
  4. What does Double Shear Value mean?
  5. What is Pin Diameter?
  6. What are Chamfers?
  7. What is the difference between mechanically applied and electro deposited zinc plating?
  8. What is Laser Sorting?
  9. Can you deliver via Bulk versus Packaged?
  10. What is a VOGELSANG Tension Bushing?
  11. How are VOGELSANG Tension Bushings used?
  12. What are the advantages of VOGELSANG Tension Bushings?
  13. Where are VOGELSANG Tension Bushings used?
  14. Do you have Minimum Production Run requirements?
  15. What is Partial Tooling?

What is a spring pin?

A Spring Pin is a non-threaded mechanical fastener.  The pin is a hollow cylinder with a longitudinal slot over the entire length.  All pins have an angled chamfer which allows and eases insertion into the hole, and  the slot allows compression during insertion.  After insertion the diameter expands to  provide an outward radial tension over the entire length of the pin which holds the parts together. Common materials used are high carbon spring steel in a plain finish or plated, 420 corrosion resistant stainless, and 300 non-magnetic series  stainless.  The combination of size, materials,  and heat treating, make spring pins a universal  fastener with simplicity, inherent advantages, and cost saving features for many assembly applications.

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What do the terms Light Duty, Standard (Medium) Duty, & Heavy Duty mean?

These terms describe the three most common duty classifications of coiled pins. Coiled style pins expand the parameters of spring pin usage. The advantages of coiled pins are enhanced by the variety of styles within the coiled pin family. Light, Standard, and Heavy are the foundation on which other coiled pins are built. As their names imply, each duty is more appropriate for some situations than for others. Users should refer to the MINIMUM DOUBLE SHEAR LOAD rating for relative strength of mechanical performance for each duty classification. Light Duty offers the least double shear value and is appropriate in soft and malleable materials and where loading isn’t much of a issue. The terms Standard and Medium are used interchangeably. Standard duty pins offer excellent double shear values and can be used in a wide variety of applications. Heavy duty pins have the greatest double shear values and can be considered for applications where shear and shock loads are high. VOGELSANG manufactures Standard and Heavy Duty pins for stock; Light Duty pins and other variations are considered upon request for quote.

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What is the difference between the duty classifications of coiled spring pins?

Coiled spring pins, according to prevailing industry specification ASME B18.8.2-2000, come in three (3) duty classifications. They are: 1. Standard Duty (sometimes referred to as Medium Duty) 2. Heavy Duty 3. Light Duty. The most commonly used are Standard Duty and Heavy Duty. As their names imply, there is a difference in their relative strength and application. The Standard Duty pin covers a very wide variety of applications. Standard Duty pins offer excellent flexibility and high strength and are often used as the preferred pin in applications ranging from hinge pins to load bearing components of an industrial assembly. Heavy Duty pins are typically designed in when superior shear strength is desired and when there are elevated stress and loading factors involved. It is almost impossible, and inaccurate, to tell the difference by sight. While each diameter in each classification does have a different material thickness, this cannot be judged accurately on a visual basis. The Double Shear value is one of the guiding criteria for differentiating duty classifications. When comparing similar diameters, Light Duty pins have the lowest Double Shear values; Standard Duty pins have greater Double Shear values than Light Duty, but less than Heavy Duty, and Heavy Duty pins have the greatest Double Shear values. The other measurable difference is in the Pin Diameter – Maximum/Minimum range. Each duty classification/diameter has its own Maximum/Minimum range. Chamfer Diameter & Length and Recommended Hole Size are the same for each diameter, regardless of duty classification. In general, Standard and Light Duty pins require less force to insert. In addition, they impart less radial tension in the application. This may be something to consider when the hole is in soft or thin material or very near the edge of the application. The double shear values of Heavy Duty pins meet or exceed the Double Shear of similar diameter slotted spring pins. VOGELSANG manufactures common sizes in Standard and Heavy Duty classifications for stock availability. Due to the lack of demand for Light Duty pins, they are quoted upon request. Coiled pins further increase the range of options for non-threaded tension fastening by way of these classifications.

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What does Double Shear Value mean?

The Double Shear Value is a measurement which states the minimum force required to shear a pin in two places at one time. Double shear is part of the ASME specification and is generally viewed as an indication of the relative strength of the pin.

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What is Pin Diameter?

Spring pins – both slotted and coiled styles – are usually called out by size. “1/4″ by 1″” would indicate a 1/4″ diameter by 1″ long part. The diameter is expressed as a nominal measurement. The salient feature of spring pins is that they are manufactured to a controlled, oversized diameter. Therefore, a 1/4″ diameter slotted pin has a “Before Insertion” or “Pre-Load” diameter range of .258″ minimum to .262″ maximum. This allows for the compression of the pin diameter as it is placed into a hole of the recommended size. The result is continuous spring pressure against the side of the hole and self-locking action that prevents loosening. The ASME specification governs the min/max range and the methodology for measuring it.

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What are Chamfers?

The chamfers are the angles at the end of the pin. The chamfer is specified by length of chamfer and the diameter at the end. This diameter is important because it is the lead in for the pin into the hole. This diameter must be smaller than the hole diameter.

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What is the difference between mechanically applied and electro deposited zinc plating?

The prevention of hydrogen embrittlement in plated parts is an important consideration. High carbon spring steel of the type used for the manufacture of spring pins is very susceptible to hydrogen embrittlement when subjected to a normal electroplating process. The risk of hydrogen embrittlement is greatly reduced and very low using the mechanical process. The most significant difference between the platings is in the methodology used to apply the zinc. Basic electroplating involves putting parts in a plating bath and activating an electric current which deposits the coating onto the parts. The mechanical process involves a powdered coating media which is peened onto the parts in a tumbling operation. The essential advantage of the mechanical process is that it does not contribute to the possibility of hydrogen embrittlement. Electroplating requires additional processing in an attempt to relieve hydrogen embrittlement; electroplated parts must be monitored and baked at highly prescribed formulas in order to address hydrogen embrittlement concerns. In addition to the very low incidence of hydrogen embrittlement, the mechanical process generally offers a more uniform coating than that obtained through electroplating and always more uniform than a hot dip galvanized coating. VOGELSANG has adopted the mechanical plating process as our internal standard.

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What is Laser Sorting?

Laser sorting is an optional service offered by VOGELSANG. We have invested in custom manufactured laser devices which can sort for extraneous materials which might be introduced during a post-manufacturing process such as heat treating or plating. By screening the pins for diameter and length characteristics, the problem of the occasional mixed or foreign parts in a shipment can be greatly reduced. Our goal is to provide zero defects and laser sorting brings us closer to that goal.

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Can you deliver via Bulk versus Packaged?

VOGELSANG is a full service manufacturer and we do offer packaging options. In general, because pins tend to be used in large volumes, our standard packaging is bulk. This could mean barrels, fiber drums, or boxes – it depends on the size of the part. Many parts can be packed at 35 to 40 pounds maximum per box, without additional cost. Packaged quantities of 1,000 pieces, or less, in bags or boxes can be accommodated at additional cost. Special packaging requests are evaluated at time of request.

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What is a VOGELSANG Tension Bushing?

Tension Bushings are bearing components manufactured in the form of a hollow cylinder with a longitudinal slit along the entire length. Tension Bushings are made from high carbon spring steel and then thru-hardened heat treated to enhance their resilience, strength, and resistance to wear. Tension Bushings are made to a controlled oversized outside diameter and a controlled after insertion, inside diameter. Tension Bushings are chamfered at one or both ends in order to facilitate insertion and removal. VOGELSANG Tension Bushings are wear parts for use in dry bearing applications, but they can be lubricated at the discretion of the user.

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How are VOGELSANG Tension Bushings used?

VOGELSANG Tension Bushings are primarily used in bearing applications that are subject to wear and inhospitable environments. The Tension Bushings can prevent much of the abrasive, and eventual ruinous, effect of metal-to-metal contact between components. These Tension Bushings do not require lubrication and are well suited for use in high-load/low speed operation in articulating or continuos applications. The combination of raw material, heat treatment, and design make the Tension Bushing an excellent bearing for use where there is little or no lubrication, lots of wear, and a desire to protect a housing bore in a more expensive piece of capital. Also, Tension Bushings are sometimes used as spacers and large diameter pin fasteners.

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What are the advantages of VOGELSANG Tension Bushings?

There are several characteristics of these Tension Bushings that are very worthy of consideration.

  1. The split, steel Tension Bushing is far more flexible than a solid part.
  2. There is an allowable hole tolerance that increases the functionality of Tension Bushings.
  3. Insertion and removal is relatively easy at both the OEM factory and in the field.
  4. Tension Bushings are self-retaining – they can accommodate an out-of round or enlarged hole.
  5. They can be replaced at far less expense and effort than the part into which they are placed.
  6. Tension Bushings are very cost effective and compare very favorable to like kind & quality solid parts.
  7. Variety & Availability: Manufactured in Lakewood, NJ, USA. There are three standard wall thicknesses (1/8″, 3/16″, & 1/4″) and approximately 25 OD x ID combinations available from stock. Specials and metric sizes quoted upon request.

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Where are VOGELSANG Tension Bushings used?

The Tension Bushings are used in a host of different industries. Manufacturers of construction/off-highway equipment, cylinders, agriculture & implement equipment, mining machinery and a variety of conveyor and material handling manufacturers all use the split, steel Tension Bushings at both the OEM and service parts level. VOGELSANG Tension Bushings are widely accepted based on quality, price and service. Split Tension Bushings offer cost effective alternative to solid hardened steel Tension Bushings. This Tension Bushing is made of one of the hardest wear materials on the market, high carbon spring steel and thru hardened. Its split design allows easy insertion, provides constant radial tension, and still offers close ID tolerance for applications with high loads, pivotal or oscillating motions even in dry or adverse environments. One obvious application is it use in clevis or rod ends for hydraulic cylinders.

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Do you have Minimum Production Run requirements?

On occasion we are requested to provide parts which do not meet standard diameters, lengths, or in materials subject to minimums. In these instances our quote may be subject to a minimum production quantity.

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What is Partial Tooling?

Tooling may be required to provide non-standard parts. In these instances it is our policy to charge for “partial tooling” to cover the cost of the tooling inserts but not the die set.

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