Washer size

[Esti1300]

WASHER, OIL BOLT
90545-300-000

Does anyone have the sizing specs of this part or one they could measure?

Best guess is OD 10mm, ID 8mm and 1mm thickness but I would rather not guess.

 

[fashlend]

0.38 (outer diameter) x 0.32 (inner diameter) x 0.1 (thickness) inches

In metric that would roughly translate to 10 x 8 x 2.5 mm

 

[Esti1300]

3.8 (outer diameter) x 3.2 (inner diameter) x 0.1 (thickness) inches

In metric that would roughly translate to 10 x 8 x 2.5 mm

Excellent. Thanks

 

[STRider]

3.8 (outer diameter) x 3.2 (inner diameter) x 0.1 (thickness) inches

In metric that would roughly translate to 10 x 8 x 2.5 mm

Clearly Sweden is a metric nation. Methinks your decimals are misplaced in the diameters. 3.8 inch O.D. would be huge!

 

[Al st1100]

WASHER, OIL BOLT
90545-300-000

Does anyone have the sizing specs of this part or one they could measure?

Best guess is OD 10mm, ID 8mm and 1mm thickness but I would rather not guess.

It's not just a washer it's a crush washer , run to your local auto parts store and tell them it's for a oil pug and match one up. There are a couple of different sizes and should be the same as many honda cars.

 

[Andrew Shadow]

It's not just a washer it's a crush washer , run to your local auto parts store and tell them it's for a oil pug and match one up. There are a couple of different sizes and should be the same as many honda cars.

This is not the crush washer for the oil pan drain bolt. It is the much smaller crush washer for the brake hydraulic couplings.

 

[DannoXYZ]

WASHER, OIL BOLT
90545-300-000

Does anyone have the sizing specs of this part or one they could measure?

Best guess is OD 10mm, ID 8mm and 1mm thickness but I would rather not guess.

0.38 (outer diameter) x 0.32 (inner diameter) x 0.1 (thickness) inches

In metric that would roughly translate to 10 x 8 x 2.5 mm

Be careful! That’s not correct size. This particular washer is used on brake line’s banjo bolts. If you have 10mm bolt, then ID of washer should be 10mm to match. Which makes its OD larger than 10mm. Most often 15mm.

https://www.amazon.com/dp/B07V2BK2M1/

https://4into1.com/copper-crush-washers-10-pack-10mm/

https://4into1.com/aluminum-crush-washers-10-pack-10mm/

https://www.treatland.tv/OEM-honda-MB5-banjo-bolt-sealing-WASHER-m10-p/oem-banjo-washer-90545-300-000.htm

 

[Al st1100]

This is not the crush washer for the oil pan drain bolt. It is the much smaller crush washer for the brake hydraulic couplings.

my bad but auto part stores have selection of copper washers that will work

 

[ST1100Y]

0.38 (outer diameter) x 0.32 (inner diameter) x 0.1 (thickness) inches
In metric that would roughly translate to 10 x 8 x 2.5 mm

Not quite...
Since it goes with the P/N 90145-MS9-612, oil bolt 10x20, it must be 12x10x2mm...

I however do prefer the OEM Honda ones over their rigid alloy (shiny surface), and would like to buy big bulks but haven't found such yet...
The aftermarket ones are all made of soft aluminum (dull surface) and tend to deform noticeable with the proper torque on the bolts...
And I'm avoiding copper rings over the possible contact corrosion of such a material mix...

 

[Andrew Shadow]

Honda OEM P/N 90545-300-000 are nominal;
I/D- 10mm
O/D- 15mm
Thickness: 1.4mm

 

[jfheath]

Info on Goodridge (major manufacturer of brake parts here in the UK) is posted here.

Article [13] - ST1300 Maintenance - Replacing the Secondary Master Cylinder (SMC) | ST1300 Articles | Page 2 | ST-Owners.com

I continue to use the copper washers. I know in theory that galvanic corrosion is possible between two different metals. But I find that the OEM alloy ones corrode badly in our salty road conditions. The edge of the washer starts corroding, and then it slowly spreads through the washer - it seems to eat away just below the surface. I've just removed the copper ones that I installed when I serviced my forks 4 years ago. They were clean and shiny - as were the faces on the caliper. In contrast the oil pan alloy washer which gets replaced at least once a year is always corroded well into the sealing part of the face.