Triumph Unit And Pre-Unit 1/4″ Semi-Domed Head Fender Bolts (6) PN# 99-3517 DS57 DS-57


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SKU: 633726141360 Categories: , , Tags: , , OE Number: 99-3517 DS57Year: 1947-1968Make: TriumphModel: Pre-unit and unit 350, 500, and 650 models.


The DS57 bolt is an important fastener as it was used as a fender stay bolt, license plate bracket bolt, oil level plug bolt and in other various capacities for many years of production. This kit features (6) bolts. The original DS57 part number is superceded to 99-3517.

The 1/4-26 TPI CEI bolt features a semi-domed head and measures 5/8″ under head. Made in the UK.

The DS57 is used in many applications on the pre-1969 Triumph models and is most commonly paired with the 82-0879 1/4-26 CEI nut.

The bolt is threaded into the nut and usually a flat or spring washer is placed under the nut.

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