| Also known as | H590 |
| Diagram | Fig. 13 — SWINGING FORK AND SUSPENSION UNITS · ref 28 |
| Subsystem | bodywork |
| Listed in parts books | 1964–1968 |
Bolt (0.4375 in. U.H.)
A 0.4375 in. U.H. mounting bolt used at various mudguard, chainguard, and exhaust bracket points, cataloged as 97-0590 (formerly H590).
This is a general-purpose bolt, part number 97-0590, also listed under the older H590 designation. The catalog spread on this one is wide - it turns up in the mudguard fitting lists, the swinging fork and chainguard section, and the exhaust pipe and muffler mounting hardware for several models, which tells you this was a common fastener the factory used in more than one spot rather than something built for a single bracket.
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Given the U.H. (under-head) length callout in the parts book, this is a bolt sized for a specific fastening depth rather than a generic hardware-store stand-in. Because it shows up across mudguards, chainguard/suspension mounting, and exhaust pipe/muffler brackets on multiple model listings from the mid-to-late 1960s catalogs, it's worth checking exactly which bracket you're pulling it from before ordering, since the same part number covers several different jobs on the bike.
If you're chasing this down from an old parts book, keep the H590 alias in mind - same physical bolt, older numbering.
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