M5×0.8 is one of the standard coarse-thread sizes for bicycle stem and headset bolts under Trade series (bicycle stem bolts). The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.
M5×0.8 Dimensional Row (Trade series (bicycle stem bolts))
| Thread size | Length options (mm) | Typical location | Head / drive | Selection rule |
|---|
| M5×0.8 | 15 / 16 / 18 | stem faceplate and steerer clamp | socket-cap or tapered socket-cap | stem manufacturer torque and engagement |
Spanner & Drive for M5×0.8 Bicycle Stem and Headset Bolts
Drive geometry for M5×0.8 Bicycle Stem and Headset Bolts is given by the row above; match the tool to the listed values.
M5×0.8 Bicycle Stem and Headset Bolts Weight
A steel M5×0.8 bicycle stem and headset bolts at the listed 151,618 mm length weighs approximately 2,412,336 g each — about 2,412,336 kg per 1,000 pieces. Stainless A2/A4 weighs roughly the same (density 7.9–8.0 g/cm³).
Actual weight varies slightly with head form, thread and finish; use this figure for freight estimation only.
Installation Tips for M5×0.8 Bicycle Stem and Headset Bolts
- At M5×0.8 the stretch in the bolt becomes the controlling factor — for critical joints, use angle-controlled or stretch-controlled tightening instead of pure torque.
Mating Parts for M5×0.8
For M5×0.8, pair with a M5×0.8 hex nut (ISO 4032 / DIN 934) and, where used, a M5×0.8 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need bicycle stem and headset bolts in a size this table does not list?
This page covers M5×0.8 bicycle stem and headset bolts. Material and finish are usually what drives a special — a grade the standard part is not stocked in, or a coating chosen against a salt-spray figure instead of a default. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
Custom bolt manufacturingSend a drawing
Applications & Industries for M5×0.8 Bicycle Stem and Headset Bolts
Bicycle Stem and Headset Bolts are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M5×0.8 to M6×1.0.
Industries that specify Bicycle Stem and Headset Bolts
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Repair shops
Torque is taken from the stem or headset maker, not a generic bolt chart.
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Bicycle assembly
M5 stem bolts clamp the faceplate and steerer hardware.
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Bike fitting
Length and head style are selected with the stem design.
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Mountain-bike service
M6 options cover larger clamp and preload hardware.
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Energy & infrastructure
Tower, pipework, switchgear and plant fixings specified for long service life and inspectable joints.
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Maintenance & MRO
Stocked replacements matched to an existing property class, thread and finish.
Typical applications
- tightening to the component manufacturer torque
- clamping a stem faceplate or steerer with the supplied metric thread
- choosing 15–18 mm M5 lengths or application-selected M6 lengths
- matching socket-cap or tapered head form
- joints where the property class is stated on the drawing
- clamping two machined faces to a calculated preload
Service conditions to specify against
- Marine and coastal
- Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- High load
- Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
- Torque and preload
- The joint is designed around bolt tension, so lubrication, coating and the friction coefficient all change the torque figure — state them together.
Where to use something else
- Do not replace a stem bolt by length alone; head seat, engagement and specified torque are safety-critical.
- Do not use a machine thread into unthreaded sheet or timber; use a tapping screw, rivet nut or insert made for that parent material.
Full application guide: where Bicycle Stem and Headset Bolts are used, how to specify them, and the cases they are wrong for
