Maryland Metrics/Lubo Products

#500 picture4.jpg (95993 bytes)

     LuBo #500 Series Self-lubricating Bearings
         can be utilized where heavy loads must be
         supported at low to medium speeds.

     Bearings have high mechanical strength with
         excellent wear resistance and self-lubrication
         properties exhibiting stable performance and
         durability under severe operating conditions.

     No form of supplementary lubrications required.
         A film of solid lubricant is transferred to the shaft
         as it starts to run. In operation, both surfaces
         burnish quickly and result in a highly polished
         bearing surface capable of withstanding
         extreme pressure.

Normally, bronze alloy is used as the base material for LuBo #500 series bearings by centrifugal or sand
casting. Other materials such as cast iron, stainless steel and even tool steels could be used according to
the applications involving extreme temperatures, environments corrosive to bronze, and loads exceeding
the compressive strength of bronze.

Bearing Materials

Code	#500SP	#500B	#500F	#500S	#500AL	#500SPX	#500HCA
Base Metal	High Strength Manganese Bronze	Red Brass	Cast Iron	Stainless Steel	Aluminum Bronze	Special Alloy	Special Alloy
Application	General Use High Load Under Water	General Use Medium Speed	High Temp. +400慢 (+725慚)	Chemical Resistance High Temp. +600慢 (1,100慚)	Sea water	Higher Loads than #500SP	Higher Loads than #500SPX

NOTE: When used for high strength bearings, alloys LuBo #500SP, #500SPX and #500HCA require hardened shafts.

Solid Lubricants

A bearing and its mating surface should always be separated by a film of lubricant. LuBo produces
proprietary solid lubricant compounds consisting of graphite, PTFE, metallic oxides, white metals,
waxes, and other minerals that are compressed and heat treated into dense plugs. These plugs are
then installed into the base metal.

Lubricants used in LuBo products are solid, permanent, and completely self-lubricating, They are
constantly tested and monitored in our laboratories to ensure superior bearing performance.

LuBo produces different solid lubricants for both high temperature (greater than 300蚌) and aquatic
application. Please contact LuBo's application engineers for assistance with these special operating
conditions.

Operating Conditions

	Base Metal	Allowable Pressure		Allowable Velocity (fpm)		Allowable PV Value (psi. fpm)		Max Temperature (蚌)
	Base Metal	(1)	(2)	(1)	(2)	(1)	(2)	(1)	(2)
#500SP	High Strength Manganese Bronze	4,300 (14,200)	4,300	98	196	46,000	92,000	570	300
#500B	Red Brass	2,100 (7,100)	2,100	160	320	28,000	46,000	750	300
#500F	Cast Iron	700 (10,500)	1,140	160	320	23,000	46,000	750	300

** Note: ( ) indicates Static Pressure, (1): Self-Lubricating, (2): Periodic Lubrication with grease/oil.

Mechanical and Physical Properties

	Specific Gravity	Tensile Strength	Brinell Hardness (3,000Kg load)	Modulus of Longitudinal Elasticity	Elongation	Thermal Linear Expansion Coefficient	Coefficient of Friction	Coefficient of Heat Conduction	Impact Strength (Notched Izod)
	Specific Gravity	psi	HB	Kpsi	%	x10�5/蚌	� (min.)	cal/sec蚌 in	ft. lb./in
LuBo #500SP	8.2	110,000	220	46,400~ 65,300	12	1.6~2.0	0.04~0.2	0.90	37.5
LuBo #500B	8.7	28,000	50~65 (500Kg load)	44,300	15	1.6~1.8	0.04~0.2	0.77	18.4
LuBo #500F	7.2	35,000	180	46,600~ 60,600	-	1.0~1.2	0.04~0.2	0.55	5.5

LuBo #500SP: is high strength bronze that is best suited for high load operating conditions.
LuBo #500B: is red brass for use under medium load conditions that is also suitable for high
temperature applications.
LuBo #500F: is a superior cast iron for both high temperature and medium speed applications.

Chemical Resistance

Code	#500SP		#500B		#500F		Remark
Concentration	Over 10%	Under 10%	Over 10%	Under 10%	Over 10%	Under 10%	O:usable X:not usable S:usable under influence
Hydrochloric Acid	X	S	X	O	X	X
Sulfuric Acid	X	O	X	O	O	S
Nitric Acid	X	X	X	X	X	X
Phosphoric Acid	X	X	X	X	X	S
Sodium Hydroxide	O	O	O	O	O	O

Graphite plugged, self-lubricating bearings are LuBo's specialty. Our proprietary solid lubricant is a
cured, compact cylinder inserted into holes machined through the bearing wall. This provides
higher quality and superior performance than the uncured lubricant mechanically forced into
grooves on the bearing surface.

LuBo is customer driven, and committed to quality, competitive
pricing, and JIT delivery.