TR 55 - 12 Single Lead Trapezoidal

This 55 mm. diameter single lead metric (trapezoidal) screw has a 12 mm lead. It is available in alloy steel or stainless steel material with corresponding aluminum bronze nuts. Choose from right-hand or left-hand threads.

Metric screw specificationsRH LH
Alloy steel screw part no.TS 055 R 012 ATS 055 L 012 A
Stainless steel screw part no.TS 055 R 012 STS 055 L 009 S
Thread form Trapezoidal
Screw diameter - turns/mm TR 55 - 12
Lead 12 mm.
Root diameter 41.27 mm.
Screw weight (lb/ft) 14.7 kg./m. (9.9 lb./ft.)
Torque to raise 1 kN 5.044 Nm (46.6 in.-lb.)
Maximum screw length 3.66 m. (12 ft.)

Nut and Flange Specifications

Nut specificationsRH LH
Nut part no.TN 055 R 012 BTN 055 L 012 B
Nut with flange part no.TF 055 R 012TF 055 L 012
Dynamic load capacity (lbs) 100 kN (22,481 lb.)
Static load capacity kg. (lbs) 173.5 kN (39,000 lb.)
Efficiency 38.2%
Material Bronze
Nominal Diameter "A" 80 mm.
Nut length "B" 75 mm.
Thread length "C" 25 mm.
Thread size M72 x 2.0
Flange part no.FL-7200
Flange diameter "D" 142 mm.
Flange thickness "E" 26 mm.
Flange hole diameter "F" 17 mm.
Number of holes in flange "G" 4
Flange Bolt Circle "H" 112 mm.
Flange material black oxide coated steel


Click on Product Specifications
 below to view Bearing Block and Screw End Conditions options available for this screw.

  • Screws are made from alloy steel
  • Nuts are made of bronze material and flanges are steel with a black oxide coating

SB Bearing Blocks

Screw NumberBearing Mount No.ABCDEFGHIJK
TS055R012A SB-30 6.500 3.690 1.875 0.875 2.000 2.375 4.750 1.156 2.312 .656 (4x) .906 Thru
  1.375 C'Bore
  2.060 Deep

DB Bearing Blocks

Screw NumberBearing Mount No.ABCDEFGHIJKL
TS055R012A DB-30 6.500 3.690 1.875 0.875 2.000 2.375 4.750 1.156 2.312 .656 (4x) .906 Thru N/A
  1.375 C'Bore
  2.060 Deep

FB Bearing Blocks

Screw NumberBearing Mount No.ABCDEFGHIJKL

SB Screw End Conditions

Screw NumberBearing Mount No.o S1A1A2A3A4A5A6o A7A8A9A10A11
TS055R012A SB-30 1.1814 1.275 0.720 0.70 0.190 0.748 1.587 2.43 1.173-18 UNS W-06 N-06 6306
  1.1810 0.188

DB Screw End Conditions

Screw NumberBearing Mount No.oS1oS2A1A2A3A4A5A6A7A8A9
TS055R012A DB-30 1.1814 1.000 5.33 3.60 3.047 0.748 0.063 1.173-18 UNS W-06 N-06 1/4 x 1
  1.1810 0.999

FB Screw End Conditions

Screw NumberBearing Mount No.oS1oS2A1A2A3A4A5A6A7A8A9A10A11
TS055R012A FB-30 1.1814 1.000 6.67 4.92 4.20 3.300 0.748 1.828 0.075 1.173-18 UNS W-06 N-06 1/4 x 1
  1.1810 0.999

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