Hobson did you know flyer
Brass Flat Round Washers: Imperial and Metric Sizes (Did You Know)
Hobson's one-page "Did You Know" flyer announcing its brass flat round washers to AS 1237. It has two tables, imperial (WRBRP012031 to WRBRP037087) and metric (WRBRPM03 to WRBRPM24), with outside and inside diameter, thickness and pack quantity for each part.
What this covers
- Imperial sizes
- Metric sizes
- Pack quantities
For Flat Washer.
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Flat round washer in brass, to AS 1237.
- Imperial sizes 1/8" to 3/8", each with two outside diameters except 1/4", which has three: 12.3, 13.9 or 15.5mm OD, all 6.8mm ID.
- Imperial washers are 0.8mm to 1.5mm thick, in packs of 200 (1/8" to 3/16") or 100 (1/4" to 3/8").
- Metric sizes M3 to M24: M3 is 7.0mm OD, 3.0mm ID, 0.5mm thick; M10 is 21.0mm OD, 10.5mm ID, 1.2mm thick; M24 is 44.0mm OD, 25.0mm ID, 2.0mm thick.
- Metric packs: 200 for M3 to M5, 100 for M6 to M24.
- Part numbers: WRBRP plus size code for imperial (e.g. WRBRP025050), WRBRPM plus size for metric (e.g. WRBRPM10).
Who it helps: Anyone matching a brass washer to an imperial or metric fastener, and staff checking OD and pack size.
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This document is published by Hobson Engineering, who supply this range to us. We show it here in full so you can read it next to the product; the summary above is ours. Read it on this page or download the PDF. For the most current version, ask us.