(M3.5) is one of the standard coarse-thread sizes for slotted oval countersunk head machine screws under ISO 2010. The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.
(M3.5) Dimensional Row (ISO 2010)
| Size | Pitch P (mm) | a (mm) | b (mm) | Head diameter dk (mm) | csh_diam (mm) | csh_height (mm) | n_min (mm) | r (mm) | t_mean (mm) | x (mm) | Length range l (mm) | Reference standard |
|---|
| (M3.5) | 0.6 | 1.2 | 38 | 8.2 | 7.1 | 2.35 | 1.06 | 0.4 | 1.0 | 1.5 | 6~35 | ISO 2010 |
Spanner & Drive for (M3.5) Slotted Oval Countersunk Head Machine Screws
Drive geometry for (M3.5) Slotted Oval Countersunk Head Machine Screws is given by the row above; match the tool to the listed values.
(M3.5) Slotted Oval Countersunk Head Machine Screws Weight
A steel (M3.5) slotted oval countersunk head machine screws at the listed 635 mm length weighs approximately 263 g each — about 263 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 (M3.5) Slotted Oval Countersunk Head Machine Screws
- At (M3.5) the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
Mating Parts for (M3.5)
For (M3.5), pair with a (M3.5) hex nut (ISO 4032 / DIN 934) and, where used, a (M3.5) flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need slotted oval countersunk head machine screws in a size this table does not list?
This page covers (M3.5) slotted oval countersunk head machine screws. Thread size and pitch, length, property class, drive form, head geometry and head marking are all specifiable — the standard part is where it starts, not where it stops. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
Custom screw manufacturingSend a drawing
Applications & Industries for (M3.5) Slotted Oval Countersunk Head Machine Screws
Slotted Oval Countersunk Head Machine Screws are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M1.6 to M10.
Industries that specify Slotted Oval Countersunk Head Machine Screws
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Restoration work
matching original slotted oval heads.
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Electrical fittings
switch plates and outlet covers.
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Cabinet hardware
hinges and strike plates with a finished look.
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Instrument panels
front panels driven by hand.
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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
- replacing damaged oval heads of the same form
- matching period or decorative hardware
- driving with a plain screwdriver in the field
- seating in a countersink with a softer visual edge
- 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 choose slotted drive for power-tool assembly; the slot cams out long before the screw is tight.
- 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 Slotted Oval Countersunk Head Machine Screws are used, how to specify them, and the cases they are wrong for
