Isostatic Bearings from National Precision

Bronze Bushings and Washers

Bronze Sleeve, Flange and Thrust Bearings

Oilube® Powdered Metal Bronze - SAE 841

• Standard stock products
• SAE 841-copper (87-90%), tin (8-9), carbon, other elements
• Powdered metal bronze providing interconnected reservoirs for oil
• Vacuum impregnated with SAE 30 oil during the manufacturing process (approx. 19% by vol.)
• Self-lubricating – when in motion oil rises to the surface for lubrication and restores itself when at rest
• Ideal for heavy loads at moderate speeds or light loads at high speeds – max Pv 50,000, P-Load 2,000, V-SFM-1,200
• Effective in temperature range of +10°F to + 175°F with standard oil
• Available in oils for other temperature ranges on a made-to-order basis
• Standard tolerances vary by size. See items for specific tolerances
• RoHS, REACH, DFARS compliant

Cast Bronze Sleeve Bearings / Bushings

Century® Cast Bronze SAE 660

• Standard stock products
• SAE 660 / CA 932-copper 83%, tin 7%, lead 7%, zinc 3%
• Longer length bar up to 105" available on made-to-order basis
• Non-porous, highly dense grain structure for long life
• Offers good hardness, strength and wear resistance; excellent anti-frictional characteristics
• Tensile strength of 35,000 psi, yield strength of 27,000 psi and brinell hardness of 72
• Ideal for heavy loads at moderate speeds or light loads at high speeds – max Pv 75,000, P-Load 3,000, V-SFM-750
• Effective in temperature range of -450° F to + 450° F
• Common mfg. specs: ASTM B505, QOC-390B Type III B144-52-3B
• RoHS – exempt under annex to directive (2005/717/RC) 9b
• REACH, DFARS compliant

Steel-Backed PTFE Lined Bushings and Washers

TU® Sleeve, Flange and Thrust Bearings

TU® Steel-Backed PTFE Lined Self-Lubricating

• Standard stock products
• Self-lubricating dry sliding bearing
• A steel-backed composite material comprised of:
  • Low carbon steel backing for extremely high load capacity-.50 – 2.7mm thick
  • Sintered bronze offers optimal heat dispersion –.20 - .35 mm thickness and
  • PTFE – lead sliding surface creates a low friction coefficient and allows for a wide temperature range – thickness .2 mm
• Can be used where many liquid lubricants fail; also performs well with lubrication
• Ideal for heavy loads at moderate speeds or light loads at high speeds – max Pv 102,000, P-Load 36,250, V-SFM-1,900
• Effective in temperature range of -328° F to +536° F
• Standard tolerances vary by size. See items for specific tolerances
• See TP® product line for a lead free, REACH and ROHS compliant alternative
• DFARS compliant

TP® Lead Free Sleeve, Flange and Thrust Bearings

TP® Lead Free Steel-Backed PTFE Lined Self-Lubricating

• Standard stock products
• Self-lubricating dry sliding bearing
• A steel-backed composite material comprised of:
  • Low carbon steel backing for extremely high load capacity - .50 – 2.7 mm thick
  • Sintered bronze offers optimal heat dispersion – .20 - .35 mm thickness and
  • PTFE – lead free sliding surface creates a low friction coefficient and allows for a wide temperature range – thickness .2 mm
• Can be used where many liquid lubricants fail; also performs well with lubrication
• Ideal for heavy loads at moderate speeds or light loads at high speeds – max Pv 102,000, P-Load 36,250, V-SFM-1,900
• Effective in temperature range of -328°F to +536°F
• Standard tolerances vary by size. See items for specific tolerances
• RoHS, REACH, DFARS compliant

Custom Cast, Sintered, & Self-lubricating Bearings

NPB also offers Isostatic Custom Quality Cast, Sintered, & Self-lubricating Bearings

National Precision supports the Isostatic custom bearing offer, which includes one of the world's largest inventories of bronze bearings in a wide variety of inch and metric sizes over a broad range of bearing types, from sleeve and flange to disc, plate and thrust, solid and cored bar in sintered, cast bronze and steel back-PTFE-lined materials. Their bearings can be oil impregnated, dry or graphite-filled to meet a broad range of application requirements.

NPB offers the broad range of Isostatic bronze alloy materials beyond our core powdered metal (SAE 841) and cast bronze (CA932 / SAE 660) products. A few of the other bronze alloys offered include high leaded tin bronze (CA 936 and 937), aluminum bronze (CA 614, 630, and 954), and manganese bronze (CA 863).

NPB offers Isostatic custom product with the following bronze alloys:

Materials (Bronze Alloys) below are the most common alloys - call to inquire about other materials.