Screws · DIN 912
DIN 912 Socket Head Cap Screw (Allen Cap Screw)
Accurate Fastners manufactures and supplies DIN 912 Socket Head Cap Screws (Allen Cap Screws) in stainless steel grades SS 202, SS 304, and SS 316, covering diameters M3 to M16 and lengths from 6 mm to 120 mm. These cold forged fasteners are produced to the DIN 912 standard and pass quality checks at both procurement and delivery stages.
- Standard
- DIN 912
- Grades
- 304 / 316 / 202
- Size
- M3 – M16
- Length
- 6 mm – 120 mm
Overview
What is the DIN 912 Socket Head Cap Screw (Allen Cap Screw)?
DIN 912 is a widely recognised metric standard for socket head cap screws, sometimes called Allen cap screws or Allen bolts. The standard specifies the dimensional requirements for a cylindrical-head fastener driven by a hexagon (Allen) socket tool. It is one of the most commonly specified screw standards in industrial machinery, fabricated assemblies, and equipment panels across manufacturing sectors worldwide.
The defining geometric feature of a DIN 912 screw is its cylindrical head with a precision internal hexagon socket. This head profile allows the fastener to sit flush or slightly proud of a counterbored surface, offering a low-profile, smooth external finish once installed. The hexagonal socket accommodates a standard Allen key or hex-bit driver, enabling high torque application in confined spaces where conventional spanner access may be restricted.
Accurate Fastners produces these screws through a cold forging process. Cold forging shapes the fastener at ambient temperature using high-pressure tooling, which typically results in a refined grain structure and consistent dimensional accuracy across the production run. Metric threading is applied in accordance with DIN 912 requirements. The combination of cold forging, stainless steel material selection, and adherence to a recognised dimensional standard gives these screws a well-defined specification that purchasing engineers can verify against drawings.
In Depth
Product description
Construction & Geometry
Each screw features a fully cylindrical head with a hexagon socket recess machined or formed to DIN 912 tolerances. The head diameter and height are proportioned to the nominal thread diameter, ensuring predictable load distribution against a bearing surface. The metric thread runs along the shank, and depending on the specified length, the screw may be partially or fully threaded in line with the standard.
The cold forging production method densifies the material at the head-to-shank transition, a zone that commonly experiences stress concentration. Lengths available span 6 mm to 120 mm across the M3 to M16 diameter range, giving designers a broad selection matrix. Dimensional consistency across the range allows for straightforward interchangeability within equipment that uses multiple screw sizes.
Functional Behaviour in an Assembly
When installed into a tapped hole or used with a nut, the cylindrical head bears against a flat or counterbored surface, clamping components together as the fastener is tightened. The internal hexagon drive transmits rotational force from the tool to the fastener efficiently, and the socket geometry helps keep the Allen key centred during tightening, reducing the likelihood of cam-out compared with slotted or cross-head drives.
In equipment assemblies, the low head profile of a socket head cap screw may allow mating parts or panels to pass close to the fastener without interference. The stainless steel construction resists general corrosion in moist or mildly aggressive environments, which may help maintain clamp load over the service life of the assembly. As with any fastener, the actual performance depends on the specific application conditions and assembly practice.
How It Differs from Similar Fasteners
Compared with a standard hex head bolt, the DIN 912 screw requires no external spanner clearance, making it more suitable for recessed or space-constrained locations. Compared with a button head or flat countersunk socket screw, the cylindrical head of the DIN 912 variant provides a greater bearing area and typically allows a higher tightening torque before head deformation becomes a concern.
Against a set screw or grub screw, the DIN 912 differs by having a full load-bearing head rather than a headless profile. When compared with DIN 7984 (a reduced-head socket cap screw), the DIN 912 head is taller and offers a larger socket depth, which is generally preferred when maximum drive engagement is required. Specifying the correct variant for the joint design is recommended before ordering.
Material & Grade
Material and grade information
- SS 304
- SS 316
- SS 202
Accurate Fastners offers DIN 912 Socket Head Cap Screws in three stainless steel grades: SS 202, SS 304, and SS 316. SS 304 is an austenitic grade widely used in general industrial and equipment applications; it offers good corrosion resistance in many non-chloride environments. SS 316 contains molybdenum, which typically provides improved resistance to chloride-containing or more chemically active environments compared with SS 304.
SS 202 is a lower-nickel austenitic grade sometimes selected for cost considerations in environments where the enhanced properties of SS 304 or SS 316 are not required by the design specification. The most appropriate grade for a given application depends on the operating environment, applicable standards, and the design engineer's assessment. Buyers are encouraged to confirm the grade requirement before placing an order, and the Accurate Fastners sales team can assist with grade availability.
Grades shown are those documented for this product in the Accurate Fastners brochure. General material notes are guidance only; confirm grade selection for your environment.
Technical Data
Technical specifications
| Product type | Screw – DIN 912 Socket Head Cap Screw (Allen Cap Screw) |
|---|---|
| Material | Stainless steel |
| Material grade | SS 304, SS 316, SS 202 |
| Applicable standard | DIN 912 |
| Nominal diameter / size | M3 – M16 |
| Length | 6 mm – 120 mm |
| Thread type | Metric |
| Head / form | Cylindrical socket head |
| Drive / tightening | Hexagon socket (Allen) |
| Manufacturing process | Cold forged |
Sizes
Available sizes
Documented size range
M3 – M16
Documented length range
6 mm – 120 mm
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
RO Water Purifier Equipment
Socket head cap screws in SS 304 or SS 316 may be used to secure pump heads, filter housings, and panel assemblies in RO water purifier systems where moisture exposure and hygiene are relevant assembly considerations.
Submersible Pump Assemblies
The low-profile cylindrical head and internal hex drive allow DIN 912 screws to be used in compact pump casings and motor end-caps where external wrench clearance is limited and a flush or near-flush head finish is desirable.
Solar Energy Mounting Structures
These screws may be used in solar panel mounting brackets and junction box assemblies, where dimensional consistency and corrosion resistance in outdoor environments are typical specification requirements for the fasteners involved.
Food & Beverage Machinery
SS 316 grade DIN 912 screws are commonly specified in food contact equipment frameworks and guards, as the grade is generally associated with improved resistance in environments involving cleaning agents or mild acidic conditions.
LED Lighting & Pharmaceutical Machinery
In LED lighting enclosures and pharmaceutical processing equipment, the clean head profile of a socket cap screw assists with maintaining smooth external surfaces on panels and covers, which may be a requirement in controlled environments.
Featured for: RO Water Purifier, Submersible Pump, Food & Beverage, Pharmaceutical Machinery
Features & Selection
Features and selection considerations
Design features
DIN 912 Dimensional Standard
Manufactured to DIN 912 specifications, ensuring that head dimensions, socket depth, thread form, and length tolerances conform to a recognised international metric fastener standard.
Cold Forged Construction
The cold forging process shapes each screw under pressure at ambient temperature, promoting material grain refinement and dimensional repeatability across production batches.
Cylindrical Socket Head Profile
The full-height cylindrical head provides a defined bearing surface and deep socket recess, accommodating a standard Allen key or hex-bit drive with good engagement and reduced risk of cam-out.
Three Stainless Steel Grades Available
Available in SS 202, SS 304, and SS 316, allowing buyers to select the grade most appropriate for their corrosion environment, budget, and applicable design requirements.
Wide Size Range
Supplied from M3 to M16 in diameter and 6 mm to 120 mm in length, covering a broad range of joint geometries within a single product family from one established manufacturer and supplier.
Before you order
Diameter, Length & Thread Engagement
Confirm the nominal diameter (M3–M16) and required length (6–120 mm) against the joint stack-up drawing, ensuring adequate thread engagement in the tapped hole or with the mating nut for the assembly.
Grade Selection for the Environment
Choose between SS 202, SS 304, and SS 316 based on the operating environment. Consult the design specification and, where necessary, discuss grade suitability with the Accurate Fastners sales team before confirming the order.
Mating Parts & Hole Preparation
Ensure the mating tapped hole or clearance hole dimensions align with DIN 912 requirements. Counterbored holes should be sized to the head dimensions specified in the standard to achieve the intended installation profile.
Quantity & Documentation
For bulk or project procurement, provide quantity requirements, grade, diameter, and length when requesting a quotation. Accurate Fastners conducts quality checks at procurement and delivery; documentation requirements should be discussed at enquiry stage.
FAQs
Frequently asked questions
What does DIN 912 specify for socket head cap screws?
DIN 912 is a metric standard that defines the dimensions of socket head cap screws, including head diameter, head height, hexagon socket size, and thread form. It is widely referenced in engineering drawings to ensure dimensional interchangeability between manufacturers and suppliers.
Which stainless steel grades are available for these screws?
Accurate Fastners supplies DIN 912 socket head cap screws in SS 202, SS 304, and SS 316. Each grade has different alloy compositions that generally affect corrosion resistance and cost. Confirm the appropriate grade for your application before ordering.
What size range does Accurate Fastners offer?
The available range covers diameters M3 to M16 and lengths from 6 mm to 120 mm. If your project requires sizes outside this range, contact the sales team to discuss whether alternative arrangements can be made on enquiry.
Can these screws be used in food processing or pharmaceutical equipment?
DIN 912 screws in SS 316 are commonly seen in food and pharmaceutical machinery due to the grade's general corrosion resistance characteristics. Suitability for a specific application should always be confirmed by the design engineer against applicable regulations and standards.
What Allen key size is needed for DIN 912 screws?
The hexagon socket size is defined by the DIN 912 standard and corresponds to the screw's nominal diameter. For example, M6 typically uses a 5 mm Allen key, and M8 typically uses a 6 mm key. Refer to the DIN 912 standard table for the complete socket size schedule.
How can I request a quotation from Accurate Fastners?
Submit an enquiry through the website enquiry form, email the sales team at export@accuratefastners.com, or contact via WhatsApp. Please include the grade (SS 202, 304, or 316), diameter, length, and required quantity to receive a specific quotation promptly.
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