Bolts · ISO 4017
ISO 4017 Hex Bolt
Accurate Fastners manufactures and supplies ISO 4017 hexagon head bolts in stainless steel grades SS 304 and SS 316, cold forged to the ISO 4017 standard. Available from M6 to M16 in lengths of 10 mm to 150 mm, these fully threaded bolts suit a broad range of industrial assemblies.
- Standard
- ISO 4017
- Grades
- 304 / 316
- Size
- M6 – M16
- Length
- 10 mm – 150 mm
Overview
What is the ISO 4017 Hex Bolt?
ISO 4017 is an internationally recognised standard that defines the dimensional and geometric requirements for hexagon head bolts with a fully threaded shank. Unlike partially threaded bolts, a fully threaded shank means the metric thread runs the entire usable length of the fastener, giving designers consistent thread engagement regardless of how the bolt is positioned within a joint stack-up. The standard specifies head dimensions, thread pitch, and tolerances to ensure interchangeability across manufacturers and markets.
The hexagon head geometry allows the bolt to be driven or restrained using a standard open-ended spanner, ring spanner, or socket tool applied to the external hex flats. This external-drive arrangement is well suited to assemblies where access from above or the side is practical, and where relatively high torque must be transmitted without risk of the drive recess stripping. The cold-forging manufacturing process used by Accurate Fastners refines the grain structure of the stainless steel, which may contribute to consistent mechanical properties across the bolt body.
Accurate Fastners produces these bolts across a diameter range of M6 to M16 and a length range of 10 mm to 150 mm. The metric, fully threaded form means each bolt can be paired with a standard ISO metric hex nut or inserted into a threaded boss, with thread engagement adjustable simply by varying insertion depth. The available stainless steel grades — SS 304 and SS 316 — make these bolts commonly considered for environments where corrosion resistance is a primary requirement.
In Depth
Product description
Construction and Geometry
ISO 4017 hex bolts feature a hexagonal head with defined width-across-flats and bearing-face dimensions, sitting atop a fully threaded shank. Accurate Fastners produces these through cold forging, a process that forms the bolt under pressure without removing material, generally producing a compact, consistent head-to-shank junction. The metric thread runs from immediately below the head to the end of the shank, leaving no unthreaded grip length.
Diameters range from M6 to M16, with standard ISO metric coarse-pitch threads unless otherwise agreed. Lengths from 10 mm to 150 mm allow selection to suit thin sheet joints through to thicker structural connections. The hexagonal head form is symmetrical across six flats, permitting incremental repositioning of a spanner when working space is limited — a practical advantage in congested panel or frame assemblies.
Functional Behaviour in an Assembly
When tightened against a mating nut or threaded component, the bolt's head bearing face clamps the joint members together, generating a clamping force that resists separation and relative movement. Because the shank is fully threaded, the engaged thread length is determined by the nut position or threaded boss depth rather than by a fixed grip zone. This can simplify procurement when joint thickness varies, as the same bolt length may serve several configurations.
The external hex drive distributes torque across the six flats of the head, reducing the likelihood of localised deformation during installation. A socket tool, offering full flat engagement, is generally preferred over an open spanner where higher torque or repeated removal is anticipated. Stainless steel's work-hardening tendency means careful torque management and the use of anti-galling lubricant are commonly recommended practices when assembling SS fasteners.
How It Differs from Similar Fasteners
ISO 4017 is the fully threaded counterpart to ISO 4014, which specifies a partially threaded hex bolt with a defined unthreaded shank section. The unthreaded grip of an ISO 4014 bolt is intended for joints where shank bearing in clearance holes is desired, whereas ISO 4017's full thread prioritises maximum thread engagement or adjustability. Selecting between them depends on whether the joint design calls for a bearing shank or maximum threaded length.
Compared to socket cap screws (ISO 4762), the hexagon head bolt presents a larger bearing face area under the head, distributing clamping load over a greater surface. Socket cap screws require internal hex tooling and suit applications where a low-profile or recessed head is needed. The ISO 4017 hex bolt, by contrast, requires no special tooling beyond a standard spanner or socket and is more accessible for field assembly or maintenance.
Material & Grade
Material and grade information
- SS 304
- SS 316
Accurate Fastners supplies ISO 4017 hex bolts in SS 304 and SS 316. SS 304 is an austenitic stainless steel with a chromium-nickel composition that is commonly used across a wide range of industrial applications. Its passive oxide layer provides meaningful resistance to oxidation and many mildly corrosive environments. SS 304 is a frequently chosen general-purpose stainless grade where aggressive chemical or chloride exposure is not the primary concern.
SS 316 incorporates molybdenum in addition to the chromium-nickel base, which typically improves resistance to chloride-containing environments and certain process chemicals compared with SS 304. It is commonly considered for food processing, pharmaceutical machinery, and coastal or marine-adjacent installations. Grade selection between SS 304 and SS 316 should be made based on the specific service environment, cleaning agents, and design requirements; the Accurate Fastners sales team can assist with grade confirmation for a given application.
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 | Bolt – ISO 4017 Hex Bolt |
|---|---|
| Material | Stainless steel |
| Material grade | SS 304, SS 316 |
| Applicable standard | ISO 4017 |
| Nominal diameter / size | M6 – M16 |
| Length | 10 mm – 150 mm |
| Thread type | Metric, fully threaded |
| Head / form | Hexagon head |
| Drive / tightening | External hex (spanner / socket) |
| Manufacturing process | Cold forged |
Sizes
Available sizes
Documented size range
M6 – M16
Documented length range
10 mm – 150 mm
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
RO Water Purifier Assemblies
Fully threaded SS 304 or SS 316 hex bolts may be used to secure membrane housings, filter frames, and panel structures in RO water purifier systems where moisture exposure and periodic cleaning are routine.
Solar Energy Mounting Structures
M6–M16 hex bolts are commonly employed in solar panel racking and mounting frames, where dimensional consistency across a large number of fastener positions and outdoor exposure conditions are typical requirements.
Food and Beverage Equipment
SS 316 hex bolts are often specified for food processing machinery and equipment enclosures, where resistance to wash-down chemicals and hygiene considerations influence material grade selection.
Pharmaceutical Machinery
In pharmaceutical production equipment, stainless steel hex bolts may be used in frame and guard assembly joints where cleanability and corrosion resistance to process media and sanitising agents are factors.
LED Lighting and Electrical Enclosures
Smaller diameter bolts within the M6–M10 range are used to assemble LED luminaire housings, mounting brackets, and electrical panel enclosures where consistent fastener geometry aids automated assembly.
Features & Selection
Features and selection considerations
Design features
Fully Threaded Shank
Thread runs the complete usable length, allowing flexible joint design and adjustable engagement depth without a defined unthreaded grip zone, simplifying selection when joint thickness varies.
Cold-Forged Construction
The cold-forging process forms bolts under pressure, refining grain structure and producing consistent head-to-shank geometry without material removal, supporting dimensional uniformity across production batches.
External Hex Drive
Six-flat hex head accommodates standard open-ended spanners and sockets, enabling installation without specialist tooling and allowing incremental spanner repositioning in confined spaces.
M6–M16 Diameter Range
A broad diameter selection from M6 to M16 allows a single supplier relationship to cover multiple fastener positions across a product design or equipment assembly.
Dual Stainless Grade Availability
Both SS 304 and SS 316 are offered, enabling grade selection based on the corrosion, chemical, and temperature requirements of each specific assembly or operating environment.
Before you order
Thread Diameter and Pitch
Specify the nominal diameter (M6–M16) and confirm whether standard ISO metric coarse pitch is required or whether a fine-pitch variant is needed. Mismatched pitch with the mating nut or tapped hole will prevent correct assembly.
Bolt Length and Joint Thickness
Measure total joint thickness including washers and nuts, then select a length from the 10–150 mm range that provides adequate thread engagement without excessive protrusion. For fully threaded bolts, the entire clamped length contributes to engagement.
Grade Selection for the Environment
Choose SS 304 for general indoor or mildly exposed assemblies and SS 316 where chlorides, process chemicals, or aggressive wash-down agents are present. Confirm the grade with the Accurate Fastners sales team if the service environment is uncertain.
Mating Parts and Documentation
Specify compatible ISO metric nuts, washers, and any relevant quality documentation requirements at the time of enquiry. Accurate Fastners' quality control team performs checks during procurement and delivery to support traceability requirements.
FAQs
Frequently asked questions
What does 'fully threaded' mean for an ISO 4017 hex bolt?
It means the metric thread extends along the entire usable shank length, from immediately beneath the head to the tip. There is no unthreaded grip section, so thread engagement depth is determined by nut position or the depth of the tapped hole rather than a fixed shank zone.
Which stainless steel grades are available for these hex bolts?
Accurate Fastners supplies ISO 4017 hex bolts in SS 304 and SS 316. SS 304 suits general-purpose use, while SS 316 is typically considered where chloride or chemical exposure is a concern. Contact the sales team to confirm the appropriate grade for your application.
What size range can Accurate Fastners supply?
Diameters from M6 to M16 and lengths from 10 mm to 150 mm are available. If your project requires sizes outside this range or specific pitch variants, please raise an enquiry so the team can advise on what can be accommodated.
What standard do these hex bolts conform to?
These bolts are manufactured to ISO 4017, which specifies hexagon head bolt dimensions, thread form, and tolerances for fully threaded bolts. Accurate Fastners' fastener range also covers IS, BS, and DIN standards across its broader product line.
Which nuts and washers should be paired with ISO 4017 hex bolts?
ISO metric hex nuts conforming to ISO 4032 or ISO 4033, and flat washers to ISO 7089 or ISO 7090, are commonly used with these bolts. Specify mating components at the time of enquiry so Accurate Fastners can assist with compatible part selection and, where required, matched grade supply.
How can I request a quotation for ISO 4017 hex bolts?
Submit your requirements — diameter, length, grade, and quantity — through the website enquiry form, email the team at export@accuratefastners.com, or reach out via WhatsApp. Include any documentation or quality certificate requirements so the team can provide an accurate quotation promptly.
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