Oil-Impregnated Sintered Bronze Bushings (SAE 841)

Oil-Impregnated Sintered Bronze Bushings (SAE 841)

High-Performance Self-Lubricating Bronze Bushing Solutions & Technologies. Minimize downtime, extend service life, and reduce costs for dynamic applications.

Oil-Impregnated Sintered Bronze Bushings (SAE 841)

Standard Sizes and Technical Data

225 standard sizesBore 1.6–100 mmCylindrical & flangedSelf-lubricating

1Overview

Oil-impregnated sintered bronze bushings are produced by powder metallurgy. Copper and tin powders are compacted and sintered into a body with a controlled network of interconnected pores, which is then vacuum-impregnated with lubricating oil. In service the moving shaft draws oil from the pore structure to the sliding surface, so the bushing supplies its own lubricant film under normal running conditions and returns the oil to the pores when motion stops. Graphite or molybdenum disulfide (MoS₂) may be added to assist sliding at start-up and under marginal lubrication. The re-lubrication interval depends on load, sliding speed, temperature and duty cycle.

2Material and Technical Data

Designation
SAE 841
Material class
Oil-impregnated sintered bronze, nominal 90 % copper / 10 % tin
Structure
Interconnected porosity, vacuum-impregnated with lubricating oil
Common forms
Cylindrical bushing, flanged bushing, thrust washer
Copper (Cu) balance, approx. 87.5–90.5 wt%
Tin (Sn) 9.5–10.5 wt%
Iron (Fe) ≤ 1.0 wt%
Carbon, as graphite ≤ 1.0 wt%, grade dependent
Other elements, total ≤ 1.0 wt%
Lead (Pb) not intentionally added
Density, oil-impregnated 6.4–6.8 g/cm³
Oil content, by volume ≥ 18 vol%
Radial crushing strength ≥ 180 MPa (approx. 26,000 psi)
Pressure × velocity, typical limit approx. 1.75 MPa·m/s (approx. 50,000 psi·ft/min)
Continuous operating temperature up to approx. 150 °C, depending on the impregnating oil

Values are typical for the material class and are not lot-specific. Confirm the figures that matter for your design against the inspection documents supplied with the goods.

3Typical Installation Points

Equipment group Installation point Suggested form Point to check
Household appliances Rotating shaft and pivot supports Cylindrical / flanged Re-lubricate according to duty cycle
Power tools and small motors Rotor shaft, gearbox shafts Cylindrical Check the pressure × velocity value
Office and printing equipment Paper-feed roller shaft, pivots Thin-wall cylindrical Low speed, clean environment
Textile machinery Spindle and guide-roller shafts Cylindrical / flanged Dust exposure: review sealing
Pumps and compressors Drive-shaft bearing, link pivot Flanged / thrust washer Check temperature and media
Fans and blowers Rotor shaft, blade-pitch pivot Cylindrical Moderate speed; balance load and speed
Conveyors and handling Roller shaft, hinges, sliders Flanged / thrust washer Intermittent motion: re-lubricate
Agricultural equipment Linkage pivot, idler shaft Flanged bushing Outdoor duty: review corrosion exposure
Exercise and fitness equipment Pivot and sliding joints Cylindrical / flanged Re-lubricate periodically
Vending and amusement machines Dispenser shaft, cam pivot Cylindrical Indoor, light duty
Motors and gear units Output shaft, reduction stages Cylindrical / flanged Check speed and load

The table lists generic industrial installation points for orientation only. It is a material and dimensional guide and is not a recommendation for any regulated application. See Scope and Disclaimer.

4Standard Sizes

All dimensions in millimetres. ID = bore diameter, OD = outside diameter, L = overall length. Duplicate entries have been consolidated. Dimensions are nominal; confirm tolerances against the drawing for the order.

4.1 Cylindrical bushings — 168 sizes

ID OD L ID OD L ID OD L
1.6 4.8 7 2.26 5.79 5.8 2.5 4 1.5
4 8 8 4.5 11 6.5 5 8 10
5 8 12 5 8 17 5 9 5
5 10 5 5 10 6 5 10 10
6 8 9.8 6 8.1 10.5 6 9 18.8
6 9 22 6 10 6 6 10 8
6 10 12 6 10 15 6 10 16
6 12 8 7 10 8 7 10 9
7 11 6.5 7 11 9 7 12 7.5
7 12 8 8 12 8 8 12 10
8 12 16 8 12.7 8 8 14 8
8 14 10 8 14 16 8.3 12 8
10 12.1 10 10 14 10 10 14 12.5
10 14 14 10 14.85 12 10 14.85 14
10 16 10 10 23 4.5 10.1 12.6 12.7
10.1 12.6 15 10.1 12.6 22 10.3 18 17
10.5 12.7 5.5 10.5 12.7 12 11 13 13
11 14.72 7.9 11 14.72 10.8 11 14.72 12.8
11 15.5 14.4 12 14 14 12 15 10
12 15 20 12 16 6 12 16 8
12 16 9.5 12 16 11 12 16 12
12 16 16 12 18 10 12 18 12
12 18 16 12 28 8 12.1 25 2
12.4 16 15.5 12.5 15.5 10.5 12.5 15.55 10.6
12.5 16 12.2 12.5 16 15 12.5 16.5 11
12.5 16.59 10.7 12.7 16 14 12.7 19.1 14
14 18 12 14 18 14 14 19 20
14 20 14 14 20 20 14.2 17.2 12.7
14.4 19.2 24.65 15 20 10 15 20 15
15 32 9 16 19.4 13.5 16 19.4 22
16 20 16 16 20 20 16 20 30
16 22 16 16 22 20 16 22 30
16 22 32 16 22 41 16.01 19.2 22
16.2 22 20 17 21 22 17 22 19
17 22 30 17 24 4 17.53 22.28 28.55
18 22 22 18 24 18 18 24 21
19 23 20 20 23 20 20 23.1 15
20 24 20 20 25 15 20 25 22
20 25 25 20 26 22 20 28 13
20.3 24 25 21.28 24.52 31.8 21.5 32.2 13
22 25 15 22 27 11 22 28 20
22 28 22 22 32 30 24 28 16.4
24 30 6 24.5 30 37 24.5 30.6 37
24.9 32.6 40 25 28 15 25 28 50
25 30 25 25 52 10 28 36 25
29.5 34 39.1 29.5 34.6 39.1 30 34 40
30 35 25 30 35 30 30 35 35
30 40 30 30 40 40 32 36 40
32.4 40 50 35 39 50 35 40 35
35 41.3 11.94 40 44 20 40 44 30
40 44 40 40 45 40 40 45 45
40 50 40 45 61 36.5 50 55 20
50 60 30 55 60 50 55 71 35.5
60 65 60 60 70 45 70 75 40
70 75 70 70 80 59 80 95 70
80 95 90 90 110 50 100 105 60

4.2 Flanged bushings — 57 sizes

ID OD Flange OD Flange thickness Overall length
4.5 8 12 2 12
6 10 14 1.5 8.5
6 12 14 2 8
8 12 16 2 6
8 12 16 2 12
8 12 16 2 14
8 14 18 3 8
8.1 10.1 16.3 1 7
8.2 10 16 2 9
9 20 24 2 9.5
10 14 18 2 10
10 14 19.5 14 20
10 15 20 2 8
10 16 17 3 13
10 16 20 3 14.5
10 16 22 3 8
12 15.9 20 2.7 20
12 16 20 2 12
12 17 22 2.5 12
12 17 22 2.5 20
12 17.2 22 2 19
12 18 22 3 23
12.7 19.05 25.4 3.17 25.4
12.9 19.4 25 3 50
14 18 22 2 12
14 20 26 2.93 21.93
15 19.05 29 2.4 12.7
15 20 27 3 15
15 22 28 3 15
15.6 26.5 35.4 11 14
16 19.4 27 2.5 16
16 20 24 2 16
16 20 24 2 20
16 22 28 3 20
16 22 28 3 25
16 22 28 3.5 30
19 24 30 2 30
20 24 28 2 16
20 24 28 2 20
20 24 28 2.02 19.95
20 25 30 4 25
20 26 32 3 15
20 26 32 3 20
20 28 35 4 20
20 28 35 4 35
20 28 35 4 45
25 30 40 4 16
25 32 40 5 25
25 35 40 3 8
25 35 45 5 15
28.5 31.8 38.2 2.5 13.2
30 35 40 3 30
30 38 46 4 35
30 40 50 5 30
32 40 48 4 32
40 50 60 5 40
50 60 70 5 55

5Shaft and Installation Guidance

  • Recommended shaft hardness: ≥ 45 HRC.
  • Recommended shaft surface finish: Ra 0.2–0.8 µm.
  • Set the press-fit allowance and the running clearance to standard sintered-bushing sizing practice, and check them against the tolerance of the mating housing bore.
  • Where the bore needs final sizing after fitting, use a ball or burnishing tool rather than a cutting tool, so that the surface pores stay open.
  • Handle porous parts carefully to avoid edge chipping, and store them clean and dry.

6Scope and Disclaimer

This document is a material and dimensional reference for a general-purpose industrial component. It is not a certification, approval or qualification document and does not replace one. No conclusion is stated here for any of the following fields of use:

Any material specification, test method or designation mentioned in this document is referred to only as a source of material-property data. Such a reference does not amount to airworthiness approval or to any other form of sector certification, and none is claimed.

Dimensions and property values are nominal. Confirm the requirements that apply to your own application, and confirm the values against the inspection documents supplied with the goods.

Technical reference document — oil-impregnated sintered bronze bushings. All dimensions in millimetres.

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