SAE 841 Sintered Bronze Flanged Bushings - Self-Lubricating

Q: What equivalent specifications does SAE 841 sintered bronze meet?

SAE 841 meets ASTM B438 Type I Grade 2, MPIF CT-0010-R, and Mil-B-5687C Type I Comp. A. If your drawing calls for any of these specifications, our flanged bushings will conform.

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Filter by dimensions below, or review specifications and custom options across the tabs.

Part #	I.D.	O.D.	Length	Flange O.D.	Flange Thk.	Qty	Request Quote

SAE 841 is highlighted below as the stocking alloy for Sintered Bronze Flanged Bushings.

Property	C95400	C93200	C86300
Material Identification
Material Type	Cast Aluminum Bronze	Cast High Leaded Tin Bronze	Cast Manganese Bronze
ASTM Specification	B505	B505	B505
SAE Equivalent	J461, J462	SAE 660	SAE 430B
Mechanical Properties
Tensile Strength	85,000 PSI min	35,000 PSI min	110,000 PSI min
Yield Strength	32,000 PSI min	20,000 PSI min	60,000 PSI min
Elongation	12% min	10% min	12% min
Hardness (Brinell)	170 typical	65 typical	225 typical
Machinability	60%	70%	80%
Physical Properties
Density	7.45 g/cm³	8.91 g/cm³	7.83 g/cm³
Chemistry
Copper (Cu)	83.0% min	81.0–85.0%	60.0–66.0%
Tin (Sn)	—	6.3–7.5%	—
Lead (Pb)	—	6.0–8.0%	—
Zinc (Zn)	—	1.0–4.0%	22.0–28.0%
Aluminum (Al)	10.0–11.5%	—	5.0–7.5%
Iron (Fe)	3.0–5.0%	—	2.0–4.0%
Manganese (Mn)	—	—	2.5–5.0%

Property	SAE 841	SAE 863
Material Identification
Material Type	Oil-Impregnated Sintered Bronze	Oil-Impregnated Sintered Iron-Copper
ASTM Specification	B438 Grade 1 Type II	B439 Grade 4
Self-Lubricating	Yes	Yes
Mechanical Properties
Tensile Strength	14,000 PSI	22,000 PSI
Yield Strength	11,000 PSI	22,000 PSI
Elongation	1%	1%
Apparent Hardness	Rockwell H-45	Rockwell F-35
K Strength Constant	26,500	30,000
Physical Properties
Density	6.4–6.8 g/cm³	5.8–6.2 g/cm³
Porosity (oil by volume)	19% min	19% min
Chemistry
Copper (Cu)	Balance	18–22%
Tin (Sn)	9.5–10.5%	—
Iron (Fe)	1.0% max	Balance
Carbon/Graphite (C)	0.3% max	0.3% max
Equivalent Standards
ASTM	B438-13 Grade 1 Type II	B439-12 Grade 4
MPIF	CT-1000-K26	FC-2000-K30
Military	MIL-B-5687D Type 1 Grade 1	MIL-B-5687D Type 2 Grade 4

Small Electric Motors

Electric motor shafts, cooling fan motors, blower assemblies, and exhaust fan motors. The flanged design simplifies motor assembly by providing both radial support and axial location in a single component. SAE 841's self-lubricating properties deliver quiet operation—critical for motors in noise-sensitive environments. With speeds up to 1,200 SFM, these bushings handle typical motor RPMs without external lubrication.

Home Appliances

Washing machine drum bushings, refrigerator fan motors, vacuum cleaner motors, kitchen mixer shafts, and blender drive assemblies. Consumer appliances demand maintenance-free operation over thousands of cycles. Oil-impregnated sintered bronze delivers consistent lubrication throughout the product lifecycle. The flange provides secure mounting in plastic housings while distributing loads across a larger bearing surface.

Office & Business Equipment

Printer paper-feed rollers, copier drum shafts, scanner carriages, and paper-handling mechanisms. Business machines require smooth, quiet operation with zero maintenance over years of service. SAE 841's self-dampening properties reduce vibration and operational noise—essential in office environments. Flanged configurations simplify assembly in automated manufacturing.

Material Handling & Packaging

Conveyor idler shafts, packaging machine rollers, label applicator guides, and printing press components. These applications involve continuous rotation at moderate speeds. The 50,000 PV rating handles the load-speed combinations typical of material handling equipment. Oil-impregnated bronze eliminates the contamination risk that external grease creates in food packaging environments.

Lawn & Garden Equipment

Riding mower front wheel bushings, lawn tractor spindles, deck pivot points, and steering column bushings. Outdoor equipment faces seasonal use patterns—long storage followed by heavy operation. Unlike grease-lubricated bearings that can dry out during storage, oil-impregnated sintered bronze maintains lubrication readiness season after season. The flange provides thrust support for wheel assemblies.

Automotive & Fitness Equipment

Window motor shafts, seat adjustment motors, wiper assemblies, treadmill drive bushings, and exercise machine cable guides. These applications share a need for smooth, quiet motion in consumer-facing products. SAE 841 handles the intermittent operation cycles typical of automotive accessories and fitness equipment. Temperature stability from -40°F to +220°F covers both automotive under-hood and garage gym environments.

Custom Pressed to Your Specifications

For production quantities requiring non-standard dimensions, we can create sintered bronze flanged bushings pressed to your exact specifications. The powder metallurgy process compacts oil-impregnated bronze powder into a custom die, then sinters at high temperature to bond the particles while preserving the porous, self-lubricating structure.

Process Overview

Custom tooling created from your specifications (including flange geometry)
Bronze powder compacted under high pressure
Sintering bonds particles without liquefying
Oil impregnation fills interconnected pores
Finished parts maintain consistent density and self-lubricating properties

Best Suited For

Production volumes where tooling cost can be amortized
Applications requiring specific flange diameter or thickness
Designs needing consistent part-to-part repeatability

Machined from Sintered Bronze Bar Stock

For lower quantities, prototypes, or one-off requirements, we machine custom flanged bushings from oil-impregnated sintered bronze bar stock. The bar stock is manufactured through the same powder metallurgy process and arrives pre-impregnated with lubricating oil, maintaining the self-lubricating properties in your finished part.

Advantages

No tooling investment required
Custom flange dimensions without dedicated tooling
Faster turnaround than custom pressing
Ideal for prototypes and short production runs

Frequently Asked Questions

Expert answers to common technical questions about sintered bronze flanged bushings, material selection, and installation specifications.

What equivalent specifications does SAE 841 sintered bronze meet?

When should I choose SAE 841 sintered bronze over cast bronze bushings?

SAE 841 is the right choice when you need self-lubricating performance without external lubrication systems. It handles moderate loads (up to 2,000 PSI) at higher speeds (up to 1,200 SFM) with a PV limit of 50,000.

For heavier loads or applications requiring oil grooves and graphite plugs, cast bronze like SAE 660 offers more customization options.

What are the standard tolerances on SAE 841 flanged bushings?

I.D. and O.D. tolerances vary by size: up to 1-1/2" is +.000/-.001", 1-1/2" to 2-1/2" is +.000/-.0015", and larger sizes increase proportionally. Length tolerance is ±.005" up to 1-1/2", ±.0075" for 1-1/2" to 3", and ±.010" for 3" to 5".

Flange diameter and thickness tolerances are based on flange O.D. See the Specifications tab for the complete tolerance chart.

What are the load, speed, and PV limits for SAE 841?

Maximum static load is 2,000 PSI. Maximum surface velocity is 1,200 SFM. The PV limit (pressure × velocity) is 50,000.

These values are for continuous rotation applications. For intermittent operation, actual limits may be higher depending on duty cycle.

Can SAE 841 flanged bushings handle oscillating motion or only continuous rotation?

SAE 841 works well in both continuous rotation and oscillating applications. The oil-impregnated structure releases lubricant under pressure regardless of motion type.

For oscillating applications with limited angular travel, the self-lubricating feature is particularly valuable since external lubrication systems are often impractical.

What press fit should I use for SAE 841 flanged bushings?

Standard press fit ranges from .001" to .003" depending on housing bore diameter. For a 1" housing bore, use approximately .001-.002" interference. For 2" bores, .002-.003" is typical.

If the bearing is long with moderate unidirectional loads, you can use the lower end of the range. See the Press Fit chart in the Specifications tab.

Sintered Bronze Flanged Bushings | SAE 841

Self-lubricating with integral flange. Oil-impregnated per ASTM B438. Standard sizes in stock.

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