Duramax "490" Rudder Bushings

DURAMAX® "490" RUDDER BUSHINGS

Duramax® hard rudder bushings are molded from a nitrile composition formulated to withstand the rugged 'impact' service encountered in ship's rudder steering systems. They possess high rigidity for maximum stability while still retaining the degree of resiliency required to dampen peak shock loads.

Duramax® bushings are molded with full length internal lubricant grooves. Grease, oil or water serve equally well as lubricants. Duramax® solid rudder bushings are resistant to deterioration by hydrocarbons, acids, salt water and electrolysis.

Caution: Duramax® bushings are supplied with molded I.D. and O.D. dimensions which allow ample material for finish machining.  However, the finish bore should not remove more than 70% of the lubricant groove.  In addition to press fit, Duramax® Bushings must be mechanically fastened with set screws.

Please call our offices for pricing and/or to order. 800-727-3787

MACHINING I.D. - O.D. CLEARANCES AND ALLOWANCES

Nom I.D. 2 3 4 5 6 7 8 9 10 11 12 13 14
Table X: Running Clearances .012 .013 .014 .015 .016 .017 .018 .019 .020 .021 .022 .023 .024
Table Y: Thermal Factor .004 .006 .008 .010 .012 .014 .016 .018 .020 .022 .024 .026 .028
Table Z: .005 .005 .005 .005 .005 .008 .008 .008 .008 .010 .010 .010 .010
  • To Determine total I.D. Clearance:  add Tables X, Y, and Z
  • Example: 8" I.D. = 8.000" +(X).018+(Y).016+(Z).008=8.042" I.D. Bore
  • To determine total O.D. Clearance, add Tables Y and Z
  • Example:  12" O.D. = 12.000" +(Y).016+(Z).008=12.024" O.D.

DURAMAX® "490" RUDDER BUSHINGS

Part No. Code No. I.D. Size O.D. Size Full Length I.D. across water grooves Net Weight Full Length (Pounds)
812100038 DX150 1.458" 2.352" 11" 1.625" 1.10
812100044 DX175 1.700" 2.595" 13" 1.970" 1.50
812100051 DX200 1.958" 3.076" 15" 2.200" 2.50
812100057 DX225 2.180" 3.329" 7.50" 2.575" 2.30
812100064 DX250 2.442" 3.681" 9" 2.750" 2.70
812100070 DX275 2.708" 3.923" 10" 2.970" 3.00
812100076 DX300 2.952" 4.205" 11" 3.390" 4.00
812100083 DX325 3.198" 4.429" 12" 3.600" 4.00
812100089 DX350 3.437" 5.192" 13" 3.760" 7.50
812100095 DX375 3.669" 5.182" 14" 4.050" 3.50
812100102 DX400 3.933" 5.450" 15" 4.285" 7.50
812100108 DX425 4.167" 5.684" 16" 4.550" 9.00
812100114 DX450 4.429" 6.026" 17" 4.685" 11.00
812100121 DX475 4.650" 6.010" 18" 5.050" 10.00
812100127 DX500 4.933" 6.682" 19" 5.310" 15.00