rotor clamp materials & finishes

Materials

Standard material for Rotor Clip retaining rings is carbon spring steel (SAE 1060-1090/UNS G10600-G10900). Rings can also be produced in our standard stainless steel (PH 15-7 Mo/UNS S15700) with 420 type cold rolled stainless steel (UNS S42000) as an option and in our standard beryllium copper (Alloy #25/UNS C17200) with copper alloy C72900 and phosphor bronze (Alloy#5218/UNS C52180) as options.

Please note that the availability of rings in the stainless steel and copper materials is subject to prior inquiry and acceptance of a formal quotation. Rotor Clip can also produce rings one gauge thicker or thinner than standard sizes. Again, such orders are subject to prior inquiry and acceptance of a formal quotation. Characteristics of each material follow:

Carbon Spring Steel

This steel is known for its high strength, and reliability in retaining ring applications. Since carbon spring steel is subject to corrosion, Rotor Clip treats all such rings with a protective coating to ensure some corrosion resistance. For long-term corrosion protection, a zinc plating or non-metallic finish should be applied over the steel. (See "Finishes" section).

Stainless Steel

• PH 15-7 Mo - An extra strength corrosion-resistant steel, capable of preventing atmospheric oxidation at temperatures up to 900° F. It also offers the following advantages:
  1. Minimal distortion due to unique heat-treating process.
  2. A minimum of 225,000 psi for high ultimate tensile strength.
  3. High creep strength. Note: We reserve the right to substitute PH 17-7 stainless steel material for PH 15-7 Mo on larger rings.
• TYPE 420 - A less expensive alternative to PH 15-7. Since general corrosion resistance for this material is less than PH-15-7, use of this material depends upon the application. Contact Techni cal Sales for assistance.
• DIN 1.4122 - A grade of stainless steel for retaining rings ordered in / for European countries.

Beryllium Copper Alloy #25

Applications that require conductivity are best served by this material. It is also characterized by excellent corrosion resistance and is particularly effective in sea air and seawater atmospheres.

Phosphor Bronze Alloy #5218

The least expensive copper material Rotor Clip offers. This type exhibits higher strength compared to standard phosphor bronze materials with the same tin percentages. It is also characterized by very good stress relaxation characteristics.

(Note: Rotor Clip can also supply phosphor bronze material to DIN standard 17 662, Material Number 2.1020. Contact Rotor Clip Technical Sales for more information).

View Materials Reference Chart

DFARS

(Defense Federal Acquisition Regulation Supplement)

*ALL ROTOR CLIP STAINLESS STEEL AND BERYLLIUM COPPER RETAINING RINGS ARE DFARS COMPLIANT*

A bit of history: DFARS is part of the "Buy American Act," which has been around since 1933. This legislation has been used throughout our history:
"... to provide a preferential treatment for domestic sources of un-manufactured articles, manufactured goods, and construction materials."
...The Act remains a Depression-era reminder of the protectionist policies of the United States prior to World War II.

The DFARS clause has enjoyed a re-birth in the past few years in response to the threat of sabotage and terrorism. It states that any specialty metal (stainless steel and beryllium copper in the case of retaining rings) must have had the metals used to produce them melted in this country or in a qualifying country (clause 225.872-1).

Qualifying countries include:

Australia	Luxembourg
Belgium	Netherlands
Canada	Norway
Denmark	Portugal
Egypt	Spain
Federal Republic of Germany	Sweden
France	Switzerland
Greece	Turkey
Israel	United Kingdom of Great Britain and Northern Ireland
Italy	United States of America

There should be a clarification made here. As distributors and manufacturers, we are not certifying that parts supplied are "DFARS Compliant." DFARS is a very extensive document and compliance with all of its provisions would be virtually impossible. Rather, we are certifying that the parts conform to DFARS 252.225-7014, "Preference for domestic specialty metals."

Finishes

Phosphate Coating (PA)

This standard finish is recommended over unfinished plain steel since it offers an extended shelf-life protection against rusting. THERE IS NO ADDITIONAL CHARGE FOR THIS FINISH.

Phosphate and Oil (PD)

This finish provides 8-hour salt spray protection.

Phosphate w/Sealer (PAL)

A coating is added to the finish to control loose phosphate crystals on the surface of the part.

Heavy Phosphate and Oil (HPD)

This finish provides 72 salt spray hours and can be used in place of costly stainless steel material in some applications. (Contact Rotor Clip Technical Sales for more information).

Zinc Plating (ZD)

This coating features a yellow dichromate post plating finish. It affords the metal excellent salt spray protection (96 hours) and is particularly effective for applications exposed to seawater. Rotor Clip SAE 1060-1090 steel retaining rings are zinc plated using a mechanical plating process, which effectively eliminates hydrogen embrittlement.

Zinc Bright (ZF)

Most of the dichromate is leeched out of this process, leaving a "bright" silver finish on the parts. ZF offers some corrosion protection (48 hours), but is widely used when the aesthetics of the part are a factor.

Zinc Dichromate w/Sealer (ZDL)

This improved finish offers corrosion protection of up to 240 hours of salt spray protection. (Heavy Zinc Dichromate with Sealer - HZDL - offers 480 hours of salt spray protection.) It is a low cost substitution for costly non-corrosive materials such as stainless steel in some applications. Call for additional information.

Trivalent Chromate over Zinc (Z3X)

This coating meets global requirements for hexavalent-free coatings. Z3X, trivalent with a sealer, affords 240 salt spray hours of protection. RoHS & ELV compliant.

Oil Over Steel (OIL)

Used for Constant Section Rings, an oil finish is applied over carbon steel to offer an extended shelf-life protection against rusting. No salt spray protection. NOTE: Electroplating can not be successfully done with steel retaining rings due to the problems encountered with hydrogen embrittlement.

View Finishes Reference Chart