Product Overview
Machine screws are threaded fasteners designed to be screwed into a pre-tapped hole or used with a nut. They are typically smaller in diameter than bolts and feature a precision-formed head for driving with a screwdriver or hex key. DonMo Hardware manufactures a comprehensive range of stainless steel machine screws in SS304 (A2) and SS316 (A4) grades.
Our machine screw line covers all common head types including pan head (DIN7985 / ISO7045), countersunk / flat head (DIN965 / ISO7046), button head (DIN7984), truss head and hex socket cap screw (DIN912 / ISO4762). Drive types include Phillips (PH), Pozidriv (PZ), slotted, hex socket (Allen) and Torx (TX).
Machine screws are widely used in electronics, electrical equipment, machinery assembly, furniture, automotive, appliances and precision instruments where a clean, low-profile fastening solution is required.
Head Types & Standards
| Head Type | Standard | Description | Common Drive |
|---|
| Pan Head | DIN7985 / ISO7045 | Rounded, low-profile head with flat bearing surface. Most common general-purpose machine screw. | Phillips / Pozidriv |
| Countersunk (Flat Head) | DIN965 / ISO7046 | Conical head that sits flush with or below the surface. 90° countersink angle. | Phillips / Pozidriv / Slotted |
| Button Head | DIN7984 | Low-profile rounded head with hex socket drive. Lower than socket cap screw for space-limited applications. | Hex Socket (Allen) |
| Hex Socket Cap Screw | DIN912 / ISO4762 | Cylindrical head with internal hex drive. High clamping force, widely used in machinery. | Hex Socket (Allen) |
| Truss Head | DIN7984 variant | Wide, low-domed head with large bearing surface. Used in sheet metal and thin materials. | Phillips / Slotted |
| Cheese Head | DIN84 / ISO1207 | Cylindrical head with slotted drive. Traditional machine screw style. | Slotted |
Key Features
- Wide Head Selection: Pan, countersunk, button, hex socket cap, truss and cheese head available.
- Multiple Drive Types: Phillips, Pozidriv, slotted, hex socket (Allen) and Torx drives.
- Corrosion Resistant: SS304 for general use, SS316 for marine, coastal and chemical environments.
- Precision Threads: Rolled or cut threads with accurate pitch for smooth engagement in tapped holes.
- Wide Size Range: M2 to M12 diameter, lengths from 3mm to 100mm, custom lengths available.
- Full & Half Thread: Full thread (standard for machine screws) and half thread options for longer lengths.
- Quality Tested: Dimensional inspection, thread gauge testing, head drive fit verification per batch.
Specifications
| Parameter | Specification |
|---|
| Product Name | Stainless Steel Machine Screw |
| Head Types | Pan Head, Countersunk (Flat), Button Head, Hex Socket Cap, Truss Head, Cheese Head |
| Drive Types | Phillips (PH), Pozidriv (PZ), Slotted, Hex Socket (Allen), Torx (TX) |
| Standard | DIN7985, DIN965, DIN7984, DIN912, DIN84, ISO7045, ISO7046, ISO4762, ANSI B18.6.3 |
| Material | SS304 (A2), SS316 (A4), Carbon Steel (Grade 4.8/8.8/10.9/12.9), Brass |
| Diameter Range | M2, M2.5, M3, M4, M5, M6, M8, M10, M12 |
| Length Range | 3mm – 100mm (custom lengths available) |
| Thread Type | Metric coarse (standard), fine thread available |
| Thread Length | Full thread (standard), half thread for lengths above 3x diameter |
| Surface Finish | Plain (natural), passivated, polished, black oxide, zinc plated (carbon steel) |
| MOQ | Standard: 100 pcs/size; Custom: 500 pcs; Special head/drive: 1,000 pcs |
| Lead Time | Stock: 3–5 days; Custom: 15–25 days |
| Certification | ISO9001, Material Test Report, Certificate of Conformity, RoHS compliant |
How to Choose the Right Head Type
- Pan Head: Best for general-purpose applications where the head will be visible. Good clamping force with a neat, rounded appearance.
- Countersunk (Flat Head): Use when you need a flush or below-surface finish. Requires a pre-countersunk hole. Common in furniture, door hardware and decorative applications.
- Button Head (Hex Socket): Use in space-limited applications where a low profile is needed but hex socket drive is preferred for higher torque than Phillips.
- Hex Socket Cap Screw: Use in machinery and high-load applications where maximum clamping force is required. The cylindrical head and internal hex drive allow high torque tightening.
- Truss Head: Use in sheet metal and thin materials where a wide bearing surface is needed to prevent pull-through.
Applications
- Electronics & Electrical: PCB mounting, enclosure assembly, panel fastening, connector mounting, appliance assembly.
- Machinery & Equipment: Machine assembly, guard mounting, nameplate fastening, small parts assembly, instrumentation.
- Automotive: Interior trim, dashboard assembly, electrical components, aftermarket parts, accessory mounting.
- Furniture & Cabinetry: Hardware mounting, drawer slides, hinges, handles, decorative trim, flat-pack furniture assembly.
- Marine & Outdoor: Boat fittings, outdoor equipment, coastal installations — SS316 recommended for saltwater exposure.
- Precision Instruments: Medical devices, laboratory equipment, optical instruments, aerospace components (special grades available).
Frequently Asked Questions
Q: What is the difference between a machine screw and a bolt?
A: Machine screws are generally smaller (typically M2–M12) and designed to be screwed into a pre-tapped hole or used with a nut. They have a precision-formed head for screwdriver or hex key drive. Bolts are typically larger (M5+) and designed to be used with a nut, with an external hex head driven by a wrench. However, the distinction is not always strict — some larger machine screws (like M8/M10 hex socket cap screws) are sometimes called bolts.
Q: Phillips vs Pozidriv drive — what is the difference?
A: Phillips (PH) and Pozidriv (PZ) look similar but are not fully interchangeable. Pozidriv has additional small radial lines between the main cross arms and is designed to reduce cam-out (the screwdriver slipping out under high torque). A Pozidriv screwdriver can drive both Phillips and Pozidriv screws, but a Phillips screwdriver may slip or damage a Pozidriv head. For production assembly, we recommend using the matching drive type. We can supply both PH and PZ drive types — please specify when ordering.
Q: Can you produce machine screws with custom head markings or part numbers?
A: Yes. We can stamp or laser-engrave part numbers, grade markings or your company logo on screw heads for OEM and private-label orders (MOQ applies). Custom packaging with your branding is also available, including labeled bags, printed cartons and blister packs with your product information.
Q: Do you provide screws and matching nuts as kits?
A: Yes. We can supply machine screws with matching nuts (hex nuts, lock nuts) and washers as complete kits, packaged together per your specification. This is popular for electronics assembly, furniture kits and project-based orders. We can also provide kitting services where multiple screw sizes are packed together in labeled compartments.
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