This reference identifies the main specification details for an M5 bolt to BS 3692, including its metric thread designation, coarse pitch, hexagonal head form, and listed material options. Use the source details below when checking a component schedule, preparing a drawing, or selecting a small fastener for an assembly.
The page also provides a DWG resource for the M5 bolt, nut, and hex-head full-threaded arrangement. Before detailing a connection, confirm the required fastener form, material, thread condition, fit, and installation requirements against the project documentation.
Standard: BS 3692 (British Standard for precision hexagon bolts, screws, and nuts)
Thread Size: M5 (Metric thread, 5 mm nominal diameter)
Thread Pitch (Coarse): 0.8 mm (fine pitch options like M5×0.5 also exist)
Thread Type: ISO metric, 60° thread angle
Bolt Types Covered: Hex bolts, hex screws, and set screws
Material Grades: Common in 8.8, 10.9, A2/A4 stainless, and mild steel
Tolerances: External thread tolerance 6g (standard medium fit per BS 3692)
Head Type: Hexagonal (dimensions per BS 3692 specifications)
Applications: Used in electronics, precision devices, small machinery, appliances, and lightweight assembly work
How to read the M5 designation
The M5 designation identifies a metric thread with a nominal diameter of 5 mm. The listed coarse thread pitch is 0.8 mm, meaning the pitch describes the axial distance between adjacent thread features. A fine-pitch option such as M5×0.5 is a separate thread designation and should not be substituted without checking the mating nut or tapped hole.
Thread, head, and material details
The source describes the thread as an ISO metric thread with a 60° thread angle and lists an external thread tolerance of 6g. These details are important when matching the bolt with a nut or internally threaded component. The listed head form is hexagonal, while the referenced bolt types include hex bolts, hex screws, and set screws.
Material options listed for this reference include 8.8, 10.9, A2/A4 stainless, and mild steel. Material selection should follow the assembly environment and design requirements; the presence of a grade in a reference list does not by itself establish allowable loads, corrosion performance, or suitability for a particular connection.
Using the reference in design and drafting
M5 fasteners are identified here for electronics, precision devices, small machinery, appliances, and lightweight assembly work. For engineering documentation, distinguish the bolt type from the thread designation and state any required material, finish, thread condition, or mating component separately.
This page can be used alongside related references on bolt connections, steel terminology, and CAD/DWG resources. The downloadable drawing is useful for drafting coordination, but the final detail should still be checked against the complete assembly and applicable project requirements.
Frequently asked questions
What does M5 mean on a bolt?
M5 identifies a metric thread with a nominal diameter of 5 mm. It does not, by itself, identify the bolt head style, material grade, length, or tolerance.
What is the coarse pitch listed for an M5 bolt?
The listed coarse pitch is 0.8 mm. The source also notes a fine-pitch M5×0.5 option, which requires compatible mating threads.
What thread tolerance is listed for this BS 3692 reference?
The source lists an external thread tolerance of 6g, described there as a standard medium fit.
Where are these M5 fasteners used?
The listed applications include electronics, precision devices, small machinery, appliances, and lightweight assembly work. Confirm the fastener choice through the project’s design and installation requirements before use.
