Materials

PB1 Phosphor Bronze

Overview

PB1 Phosphor Bronze contains 10% to 11% tin and is a high strength material that is often referred to as ‘gear bronze’. Components that are machined from PB1 are particularly durable in applications where high working loads and speeds are encountered, provided that there is good alignment and adequate lubrication. PB1 has good machining properties and good corrosion resistance to seawater and brine, making it suitable for pump and valve components. All Kormax PB1 Phosphor Bronze is manufactured using finely controlled continuous or centrifugal casting techniques to ensure hardness and strength is superior to sand-casting methods. This also means that the material has a fine grain structure and is free from porosity.

Common Applications

Worm wheels and gears
Pump and valve components
Bushes and bearings
Gears
Flanges
Hydraulics
Marine ultrasonics
Excavation & cranes
Linear bearings
Vehicle hoist nuts
Leadscrew nuts

Key Features

Handles high working loads
Good for high working speeds
Suitable for pump and valve components
Good corrosion resistance to seawater and brine
Suitable for heavy duty gears and worm wheels
Commonly used in running nut applications such as vehicle hoists and leadscrews

Material Profile

Profile
Size Range
Metric Size Range (mm)
Imperial Size Range (in)
NZ (Availability)
AUS (Availability)
Manufacturing Method
Solid Round Bar
See Size Range
12.70 to 254.00 (OD)
1⁄2 to 10 (OD)
Stocked
Stocked
Continuous Cast
Hollow Round Bar
See Size Range
50.80 to 203.20 (OD)
2 to 8 (OD)
Stocked
Stocked
Continuous Cast & Centrifugal
Diameter (mm)
Diameter (inch)
Weight (Kg/MTR)
12.70
1⁄2
1.64
19.05
¾
3.00
25.40
1
5.12
31.75
1-¼
7.88
34.93
1-3⁄8
9.49
38.10
1-1⁄2
11.13
44.45
1-¾
15.04
50.80
2
19.53
57.15
2-¼
24.61
63.50
2-1⁄2
30.28
69.85
2-¾
36.02
76.20
3
42.76
82.55
3-¼
50.08
88.90
3-1⁄2
57.98
101.60
4
75.91
114.30
4-1⁄2
95.70
127.00
5
116.65
152.40
6
168.52
177.80
7
229.34
203.20
8
298.39
254.00
10
463.74
OD x ID (mm)
OD x ID (inch)
Kg/MTR
50.8 X 25.4
2 X 1
15.54
50.8 X 31.75
2 X 1-¼
13.08
50.8 X 38.1
2 X 1-1⁄2
10.12
63.5 X 25.4
2-1⁄2 X 1
26.29
63.5 X 38.1
2-1⁄2 X 1-1⁄2
20.78
63.5 X 44.5
2-1⁄2 X 1-¾
17.14
76.2 X 25.4
3 X 1
38.83
76.2 X 38.1
3 X 1-1⁄2
33.40
76.2 X 50.8
3 X 2
26.01
82.55 X 31.75
3-¼ X 1-¼
44.35
88.9 X 50.8
3-1⁄2 X 2
42.15
88.9 X 63.5
3-1⁄2 X 2-1⁄2
32.88
88.9 X 69.85
3-1⁄2 X 2-¾
26.20
101.6 X 25.4
4 X 1
72.02
101.6 X 38.1
4 X 1-1⁄2
66.64
101.6 X 50.8
4 X 2
59.54
101.6 X 63.5
4 X 2-1⁄2
49.48
101.6 X 76.2
4 X 3
37.10
114.3 X 63.5
4-1⁄2 X 2-1⁄2
68.81
114.3 X 88.9
4-1⁄2 X 3-1⁄2
42.41
127 X 50.8
5 X 2
100.85
127 X 76.2
5 X 3
78.64
127 X 88.9
5 X 3-1⁄2
64.10
127 X 101.6
5 X 4
48.80
139.7 X 76.2
5-1⁄2 X 3
104.25
152.4 X 50.8
6 X 2
151.76
152.4 X 76.2
6 X 3
129.76
152.4 X 101.6
6 X 4
100.73
165.1 X 127
6-1⁄2 X 5
90.45
177.8 X 101.6
7 X 4
160.58
190.5 X 101.6
7-1⁄2 X 4
193.98
190.5 X 127
7-1⁄2 X 5
154.10
190.5 X 152.4
7-1⁄2 X 6
107.19
203.2 X 152.4
8 X 6
142.86

Chemical Composition

Element Symbol Range % Nominal %
Tin Sn 10.0 to 11.0 10.5
Lead Pb 0.25 maximum
Zinc Zn 0.05 maximum
Nickel Ni 0.10 maximum
Iron Fe 0.10 maximum
Aluminium Al 0.01 maximum
Phosphorus P 0.50 to 1.0 0.7
Copper Cu Balance

Mechanical Properties

Metric Values Imperial Values
Tensile Strength Min 276 N/mm² 40000 psi
Yield Strength Min 172 N/mm² 25000 psi
Elongation Min 10% 10%
Hardness Min 102 BHN 102 BHN

Comparative Specifications

BS1400-PB1

AS1565 90710

SAE 65

JIS H5113 – PBC2C

DIN 1705 – G-CuSn10

ISO 1338 – CuSn10P

BS EN 19 82:1999 – CuSn11P

Machining Allowances

All Kormax PB1 Bronze bar has machining allowances added to the sizes quoted. To use 4-1⁄2” x 2-1⁄2” hollow bar as an example, this material would measure approximately 4.560” to 4.575″ OD x 2.400” to 2.440″ ID as supplied (see table below). Therefore, this allows finished components measuring 4-1⁄2” OD x 2-1⁄2” ID to be easily manufactured from 4-1⁄2” x 2-1⁄2” hollow bar.
Size Range OD Allowance ID Allowance
up to 3-3⁄4” +0.060″ to +0.075″ -0.060” to -0.100″
4” to 5” +0.060″ to +0.075″ -0.060” to -0.120″
5-1⁄4” to 6” +0.080″ to +0.112″ -0.088” to -0.183″
6-1⁄4” to 8” +0.094″ to +0.126″ -0.098” to -0.193″
Above 8″ +0.125″ to +0.196″ -0.125” to -0.272″

Resources

Data Sheet

Alloy PB1 (Phosphor Bronze) Data Sheet

PDF (93 KB)

https://www.kormax.com/wp-content/uploads/2022/11/Alloy-PB1-Phosphor-Bronze-Material-Data-Sheet-Updated-1.pdf

Blog

What is Bronze and Bronze Alloy-Naming Systems and Standards?

Resource

Bronze Manufacturing Processes

PDF (702 KB)

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Related Products

PB2 Phosphor Bronze

Compared to PB1, PB2 phosphor bronze alloy has slightly increased tin content, giving excellent wear resistance. It offers high strength and good machining characteristics, with good corrosion resistance – especially in the environment of salt water and brine. Often referred to as ‘gear bronze’, PB2 is typically used in applications such as pump and valve components and bearings which are subject to medium to high loads and speeds. All Kormax PB2 Phosphor Bronze is manufactured using finely controlled continuous or centrifugal casting techniques, ensuring hardness and strength is superior to sand-casting methods. This also means that the material has a fine grain structure and is free from porosity.