Home>ASTM Standards>ASTM F2443-04(R2021) pdf free download

ASTM F2443-04(R2021) pdf free download

ASTM F2443-04(R2021) pdf free download.Standard Specification for Roller, Bearing, Needle, Ferrous, Solid, Spherical End
1. Scope
1.1 This specification covers ferrous needle rollers having spherical ends. 1.2 Spherical-ended needle rollers designed to this specifi- cation are intended for use as bearing components. A comple- ment of rollers is run on a hardened (HRC 58-65, see Test Methods E18) shaft and in a hardened (HRC 58-65) housing bore to form the bearing. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 This specification contains many of the requirements of MS19065, which was originally developed by the Department of Defense and maintained by the Defense Supply Center Richmond. The following government activity codes may be found in the Department ofDefense, Standardization Directory SD-1.1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
5. Materials and Manufacture
5.1 Rollers—Rollers shall be manufactured of chrome alloy steel E50100, E51100, E52100, in accordance with SAE AMS 66, SAE AMS 6440, SAE AMS 6444, and Specification A295. 5.2 The use ofrecycled materials that meet the requirements of the applicable material specification without jeopardizing the intended use of the item is encouraged. 5.3 Material certifications are required for all materials used. Each lot of needle rollers shall be traceable to these certifications. These certifications shall be available for review by the purchaser and provided to the purchaser when specified in the contract or purchase order. The needle roller manufac- turer shall determine conformance of materials on a periodic basis. These tests may be performed by the manufacturer’s internal laboratory or by a laboratory external to the manufac- turer. X-ray energy spectrometry, or comparable technology, may be used for the chemical identification and analysis of the materials.
6. Other Requirements
6.1 Heat Treatment: 6.1.1 Rollers 0.125 in. (3.18 mm) and Smaller Diameter, shall be through hardened to Rockwell HRA 81.2-83.4, in accordance with Test Methods E18. 6.1.2 Rollers Larger than 0.125 in (3.18 mm) Diameter, shall be through hardened to Rockwell HRC 60 to 64 in accordance with Test Methods E18. N OTE 1—Hardness tests can be made using various techniques; however, in the case ofdisputes, a hardness test made on flats of sufficient width to give a true reading will be considered to be the definitive value. 6.2 Protective Coating: 6.2.1 Manufacturer shall put rollers in rust-preventative packaging or coat rollers with rust-preventive film. 6.2.2 A material certification for the rust preventative shall be available for review by the purchaser. The needle roller manufacturer shall determine conformance of the rust preven- tative material(s) on a periodic basis. Ifthe purchaser maintains a list of approved rust preventatives, and if the rust preventa- tive supplied by the needle roller manufacturer is on the approved list, then the requirement for periodic testing of the rust preventative would be eliminated. For example, periodic testing would not be required if parts supplied to the Depart- ment of Defense were protected with a rust preventative listed in a current QPL (Qualified Products List).
7. Dimensions and Permissible Variations
7.1 Dimensioning and tolerancing shall conform to ASME Y14.5M. 7.2 Products manufactured in accordance with this specifi- cation shall meet the requirements shown in Table 1. 7.2.1 Roller Diameter, D w —Perfect form at MMC (maxi- mum material condition) is not required. 7.2.2 The reference end form radius, R w , is approximately equal to the roller diameter, D w . 7.2.3 The effective length, L we , is only to be used for calculating capacities. 7.3 Rollers are intended to be used in complements where they are installed in housings and used with shafts to function as a rolling bearing.
8. Workmanship, Finish, and Appearance
8.1 Workmanship—Cylindrical surfaces ofthe roller shall be free from scratches, pits, rust, indications of soft spots, and other surface imperfections. 8.2 Surface Finish—The effective roller surface shall have a maximum surface roughness, in accordance with ANSI B46.1, of 8 µin. Ra (0.20 µm Ra).

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