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SPECIALIST STEEL & ENGINEERING SUPPLIES

HARDENED-STEEL BUSHES

Formark's Hardened-Steel Bushes are world-class high-impact bushings for repairing diggers bushes, bucket and attachment bushes, excavators and heavy machinery bushes. Designed and manufactured with precise tolerances - allowing for interference and crush - Formark bushes can be used in multiple industries including mining, farming, automotive, construction and heavy mechanical engineering repair. Our steel bushes are purpose-built from high-grade steel, and case-hardened to endure the toughest of challenges. Formally Kormax Case Hardened Bushes, (now manufactured and sold exclusively by Formark) we can also custom manufacture case-hardened steel bushes to your unique specification. Manufacturing capabilities include bushes, digger pins, roller pins and digger bushes - ideally suited for lubricated applications - manufactured with central, plain, or customised grease grooves for oil or grease.
(FORMALLY KORMAX CASE-HARDENED BUSHES)
COMMON APPLICATIONS
  • Attachments
  • Earth moving equipment
  • Excavators
  • Farm machinery
  • Hydraulics cylinders
  • Mining Equipment
KEY FEATURES
  • Suited for high impact applications
  • Require grease lubrication
  • Made with central, spiral or custom grease grooves
  • High wear and deformation resistance

TECHNICAL SPECIFICATIONS

PROPERTIES

Physical Properties
Condition
Metric Values
Imperial Values
Maximum Contact Pressure
Sliding
50 N/mm2
7300 psi
Operating temperature
Minimum
-50 ° C
-58 ° F
Operating temperature
Maximum
150 ° C
302 ° F
Maximum sliding speed
Lubricated
0.1 m/s
20 fpm
Maximum PV factor
Lubricated
1.5 N/mm2 x m/s
43000 psi x fpm
Coefficient of friction
Lubricated

0.2
Physical Properties
Unit
Value
Surface Roughness
µm
< 0.8
Surface Hardness
HB
> 600

TOLERANCES

Internal Central Grease Groove; External Distribution Groove
Size Range ID
ID Tolerance
OD Tolerance
Length
25 to 60mm (METRIC)
+0.1mm to +0.15mm
+0.0 mm to +0.05mm
-0.5 mm to +0.0 mm
1" to 2-1/4" (IMPERIAL)
+0.1 mm to +0.15mm
+0.0 mm to +0.05 mm
-0.5mm to +0.0mm
2-1/2" to 3-1/2" (IMPERIAL)
+0.15 mm to +0.2 mm
+0.12 mm to +0.17 mm
-0.5 mm to +0.0 mm
Internal Spiral Grease Grooves; External Distribution Grooves
Size Range ID
ID Tolerance
OD Tolerance
Length
65 to 100 (METRIC)
+0.15 mm to 0.2 mm
+0.12 mm to +0.17 mm
-0.5 mm to +0.0 mm
110 to 120 (METRIC)
+0.35 mm to +0.40 mm
+0.25 mm to +0.30 mm
-0.5 mm to +0.0 mm

STOCKLIST

INTERNAL CENTRAL GREASE GROOVE BUSHES

metric
ID (mm)
OD (mm)
LENGTH (mm)
CODE
25
33
32
8157.HSB
25
35
25
8159.HSB
25
35
32
8161.HSB
25
35
38
8163.HSB
28
36
40
8165.HSB
30
38
40
8177.HSB
30
38
50
8179.HSB
30
40
30
8181.HSB
30
40
35
8183.HSB
30
40
40
8185.HSB
30
40
45
8187.HSB
30
45
30
8189.HSB
30
45
40
8191.HSB
31.9
44
50
8195.HSB
32
38
25
8199.HSB
35
45
30
8200.HSB
35
45
35
8202.HSB
35
45
40

35
45
45
8206.HSB
35
45
50
8208.HSB
35
45
60
8210.HSB
35
50
50
8212.HSB
38
48
35
8215.HSB
38
48
40
8217.HSB
38
48
45
8219.HSB
38
48
55
8221.HSB
38.1
45
30
8213.HSB
40
48
40
8229.HSB
40
50
25
8231.HSB
40
50
30
8233.HSB
40
50
35
8235.HSB
40
50
40
8237.HSB
40
50
45
8239.HSB
40
50
50
8241.HSB
40
50
63
8243.HSB
40
50
80
8245.HSB
40
55
60
8247.HSB
45
55
25
8249.HSB
45
55
30
8251.HSB
45
55
35
8253.HSB
45
55
40
8255.HSB
45
55
45
8257.HSB
45
55
50
8259.HSB
45
55
55
8260.HSB
45
60
40
8262.HSB
45
60
50
8264.HSB
45
60
60
8266.HSB
45
62
40
8268.HSB
50
60
30
8270.HSB
50
60
32
8272.HSB
50
60
35
8274.HSB
50
60
40
8276.HSB
50
60
45
8278.HSB
50
60
50
8280.HSB
50
60
55
8282.HSB
50
60
60
8284.HSB
50
60
70
8286.HSB
50
60
80
8288.HSB
50
60
90
8290.HSB
50
65
50
8292.HSB
50
65
60
8294.HSB
50
65
70
8296.HSB
55
45
50
8298.HSB
55
65
45
8299.HSB
55
65
50
8301.HSB
55
65
55
8303.HSB
55
65
60
8305.HSB
55
65
70
8307.HSB
55
68
45
8309.HSB
55
70
60
8311.HSB
55
70
70
8313.HSB
60
70
50
8315.HSB
60
70
60
8317.HSB
60
70
70
8319.HSB
60
70
80
8321.HSB
60
75
50
8323.HSB
60
75
60
8325.HSB
60
75
65
8327.HSB
60
75
70
8329.HSB
60
75
75
8331.HSB
60
75
80
8333.HSB
60
80
50
8335.HSB
60
80
65
8337.HSB
60
80
80
8339.HSB
IMPERIAL
ID (INCH)
OD (INCH)
LENGTH (INCH)
CODE
1"
1-3/8"
1"
8141.HSB
1"
1-3/8"
1-1/4"
8142.HSB
1-1/4"
1-3/4"
1-1/2"
8125.HSB
1-1/4"
1-3/4"
2"
8127.HSB
1-1/2"
1-3/4"
1-1/4"
8116.HSB
1-1/2"
1-3/4"
2"
8117.HSB
1-1/2"
2"
1-1/2"
8119.HSB
1-1/2"
2"
1-3/4"
8121.HSB
1-1/2"
2"
2"
8123.HSB
1-3/4"
2-1/4"
1-1/2"
8138.HSB
1-3/4"
2-1/4"
2"
8140.HSB
2"
2-1/2"
1-3/4"
8167.HSB
2"
2-1/2"
2"
8169.HSB
2"
2-1/2"
2-1/2"
8170.HSB
2"
2-1/2"
3"
8173.HSB
2"
2-1/2"
3-1/2"
8174.HSB
2-1/4"
2-3/4"
2"
8150.HSB
2-1/4"
2-3/4"
2-3/4"
8151.HSB
2-1/4"
2-3/4"
3"
8154HSB
2-1/2"
3"
2"
8143.HSB
2-1/2"
3"
2-1/2"
8144.HSB
2-1/2"
3"
3"
8147.HSB
2-1/2"
3"
3-1/2"
8148.HSB
2-3/4"
3-1/4"
3"
8155.HSB
3"
3-1/2"
2"
8223.HSB
3"
3-1/2"
3"
8225.HSB
3"
3-1/2"
3-1/2"
8226.HSB
3-1/2"
4"
3-1/2"
8197.HSB

INTERNAL SPIRAL GREASE GROOVE BUSHES

ID (mm)
OD (mm)
LENGTH (mm)
CODE
65
75
50
8341.HSB
65
75
65
8343.HSB
65
75
75
8345.HSB
65
80
50
8347.HSB
65
80
60
8349.HSB
65
80
65
8351.HSB
65
80
80
8353.HSB
70
80
50
8355.HSB
70
80
80
8357.HSB
70
85
50
8359.HSB
70
85
60
8360.HSB
70
85
70
8362.HSB
70
85
80
8363.HSB
70
85
85
8365.HSB
70
85
90
8367.HSB
71
86
70
8369.HSB
71
86
80
8371.HSB
75
85
60
8375.HSB
75
85
80
8377.HSB
75
85
100
8373.HSB
75
90
60
8381.HSB
75
90
70
8383.HSB
75
90
80
8385.HSB
75
90
90
8387.HSB
75
90
100
8379.HSB
80
90
60
8393.HSB
80
90
70
8395.HSB
80
95
50
8399.HSB
80
95
60
8401.HSB
80
95
65
8403.HSB
80
95
70
8405.HSB
80
95
80
8407.HSB
80
95
90
8409.HSB
80
95
100
8397.HSB
80
100
75
8391.HSB
80
100
100
8389.HSB
85
95
50
8417.HSB
85
95
80
8419.HSB
85
100
75
8413.HSB
85
100
85
8415.HSB
85
100
100
8411.HSB
90
100
100
8421.HSB
90
100
110
8423.HSB
90
105
50
8431.HSB
90
105
62
8433.HSB
90
105
70
8435.HSB
90
105
80
8437.HSB
90
105
88
8439.HSB
90
105
96
8440.HSB
90
105
100
8425.HSB
90
105
110
8427.HSB
90
105
128
8429.HSB
90
106
105
8441.HSB
90
110
100
8445.HSB
90
110
120
8447.HSB
95
110
75
8453.HSB
95
110
100
8451.HSB
100
115
85
8104.HSB
100
115
100
8100.HSB
100
115
120
8102.HSB
100
116
100
8106.HSB
100
116
115
8108.HSB
100
120
90
8114.HSB
100
120
100
8110.HSB
100
120
130
8112.HSB
110
125
100
8129.HSB
110
125
125
8131.HSB
110
125
150
8133.HSB
120
135
95
8135.HSB