Bolts
Anchor Bolt
Accurate Fastners manufactures and supplies stainless steel anchor bolts in metric sizes from M8 to M20, available in SS 202, SS 304 and SS 316 grades. Each anchor bolt is supplied as a complete sleeve anchor assembly with hex nut and washer.
- Standard
- —
- Grades
- 304 / 316 / 202
- Size
- M8 – M20
- Length
- On enquiry
Overview
What is the Anchor Bolt?
An anchor bolt is a fastener designed to attach structural or mechanical elements to a concrete or masonry substrate. Unlike standard bolts that pass through a clearance hole and mate with a nut on the reverse side, anchor bolts are embedded or mechanically engaged within the base material itself. They are widely used in construction, plant installation and equipment mounting wherever a solid, load-transferring connection to a fixed substrate is required.
The product supplied by Accurate Fastners is a sleeve anchor type with a hex nut and washer included as part of the assembly. In this configuration, a threaded bolt rod passes through an expansion sleeve. As the hex nut is tightened, the sleeve expands outward against the walls of a pre-drilled hole, creating a mechanical interlock with the substrate. The metric thread form ensures compatibility with standard metric tooling and mating hardware. Sizes are available from M8 through to M20.
Stainless steel construction distinguishes these anchor bolts from carbon steel equivalents, making them more suitable for environments where moisture, cleaning agents or moderate chemical exposure is a concern. Accurate Fastners' quality control team performs checks during procurement and at the point of delivery, and the fastener range is aligned with recognised IS, BS and DIN standards. The complete sleeve anchor assembly—bolt, expansion sleeve, hex nut and washer—is supplied together for straightforward installation on site.
In Depth
Product description
Construction and Geometry
The anchor bolt assembly consists of a metric-threaded bolt rod, an expansion sleeve that surrounds the lower shank, a flat washer and a hex nut. The threaded section follows the metric standard, which specifies pitch, thread form and tolerance class in a well-documented and internationally recognised manner. Diameters range from M8 to M20, providing a corresponding range of load-carrying cross-sections suited to varied substrate and fixture requirements.
The hex nut is the drive interface for this assembly. Tightening is performed using a standard open-ended or socket spanner applied to the hex nut rather than a dedicated drive recess in the bolt head. The flat washer distributes bearing stress across the fixture surface, reducing the risk of localised deformation at the mounting hole. The geometry of the sleeve is engineered to expand uniformly within the drilled hole when the nut is torqued down.
Functional Behaviour in an Assembly
When installed, the sleeve anchor operates on a mechanical expansion principle. A hole is drilled into the substrate to the diameter and depth specified for the chosen bolt size. The assembly is inserted, the fixture is positioned over the protruding bolt, the washer is placed and the hex nut is engaged. As the nut is tightened, it draws the bolt upward relative to the sleeve, forcing the sleeve to expand radially and grip the hole walls, creating the anchoring force.
The resulting connection transfers tension and shear loads from the attached element into the substrate through the expanded sleeve. Load capacity is influenced by the bolt diameter, embedment depth, substrate strength and the integrity of the installation. These variables should be assessed during engineering design. The stainless steel material grade of the bolt rod and sleeve plays a secondary role in the functional behaviour, primarily influencing corrosion resistance over the service life of the installation.
How It Differs from Similar Fasteners
Sleeve anchor bolts differ from through-bolts in that they do not require access to the reverse face of the substrate. Compared with chemical anchors, which rely on adhesive resin to bond a threaded rod into a hole, sleeve anchors provide an immediate mechanical interlock without cure time, though chemical anchors may be preferred in cracked concrete or where vibration is significant. Compared with wedge anchors, sleeve anchors typically offer a more uniform expansion over a greater sleeve length.
Within Accurate Fastners' fastener range, anchor bolts are distinct from standard hex bolts, stud bolts or foundation bolts in their end use: they are specifically intended for post-installed anchorage into a solid substrate rather than bolted joints between two components with access to both sides. The inclusion of the sleeve, nut and washer in a single supplied assembly also differentiates this product from loose fastener components that must be sourced and assembled separately.
Material & Grade
Material and grade information
- SS 304
- SS 316
- SS 202
Anchor bolts are available in three stainless steel grades: SS 202, SS 304 and SS 316. SS 202 is an austenitic grade with a lower nickel content than SS 304, which may make it a cost-considered option in relatively dry or mildly exposed indoor environments. SS 304 is one of the most commonly used austenitic stainless steels in general industry, offering a balance of corrosion resistance, formability and availability. It is typically selected for applications where exposure to moisture or mild chemicals is anticipated.
SS 316 contains molybdenum, which generally improves resistance to chloride-induced corrosion compared with SS 304. It is commonly considered for environments involving salt air, humid conditions, cleaning-in-place processes or chemical contact, such as those found in food and beverage or pharmaceutical plant installations. The appropriate grade for a specific application should be confirmed with Accurate Fastners' sales team, taking into account the substrate, the surrounding environment and the intended service life of the anchored connection.
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 – Anchor Bolt |
|---|---|
| Material | Stainless steel |
| Material grade | SS 304, SS 316, SS 202 |
| Nominal diameter / size | M8 – M20 |
| Length | To be confirmed on enquiry |
| Thread type | Metric |
| Head / form | Sleeve anchor with hex nut and washer |
| Drive / tightening | Tightened with nut |
Sizes
Available sizes
Documented size range
M8 – M20
Documented length range
On enquiry
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
Water Treatment Plant Installation
Anchor bolts may be used to secure RO water purifier frames, pressure vessel supports and pipework brackets to concrete plinths or walls, where SS 304 or SS 316 grades offer resistance to the wet environment typically encountered.
Solar Energy Structure Mounting
Solar panel mounting structures are commonly fixed to concrete foundations using anchor bolts. Stainless steel grades help resist outdoor weathering over the extended service life expected of solar energy installations.
Food and Beverage Facility Fitout
Equipment bases, handrails and hygienic wall cladding supports in food processing environments may be anchored using SS 316 anchor bolts, given the grade's general performance in cleaning-agent contact and humid production areas.
Pharmaceutical Machinery Anchoring
Pharmaceutical production equipment is typically mounted to clean-room or production floor substrates. Stainless steel anchor bolts support the hygienic material requirements commonly associated with pharmaceutical facility construction and equipment installation.
General Industrial and Structural Use
Anchor bolts are routinely used across general industrial plant construction to secure machinery bases, structural steel columns, pump sets and electrical panel supports to concrete substrates, with grade selection based on the local environment.
Featured for: Solar Energy
Features & Selection
Features and selection considerations
Design features
Complete Sleeve Anchor Assembly
Each unit is supplied with the expansion sleeve, hex nut and flat washer included, reducing the need to source and match separate components before installation on site.
Metric Thread Form
The metric thread ensures compatibility with standard metric spanners, sockets and mating hardware widely used across Indian and international industrial construction and machinery installation projects.
M8 to M20 Diameter Range
The available range of eight nominal diameters from M8 through M20 allows selection to suit varying load requirements, fixture hole sizes and substrate conditions within a single product family.
Three Stainless Steel Grades
SS 202, SS 304 and SS 316 grade options allow the buyer to match corrosion resistance level to the specific environmental conditions and budget considerations of each project.
Quality-Checked at Procurement and Delivery
Accurate Fastners' quality control team conducts checks at the point of raw material procurement and again prior to delivery, supporting consistency in the product supplied to customers.
Before you order
Diameter and Embedment Depth
Select the bolt diameter (M8–M20) and required embedment depth based on the load to be transferred and the substrate condition. These parameters should be determined during engineering design before placing an order.
Grade Selection for the Environment
Specify SS 202 for dry indoor use, SS 304 for general moisture-exposed conditions or SS 316 where chlorides, cleaning agents or high humidity are present. Confirm the appropriate grade with Accurate Fastners' sales team if uncertain.
Mating Fixture and Substrate
Confirm the thickness of the fixture being anchored and the substrate material (concrete grade, block type) before ordering. These factors influence the required sleeve anchor length, which should be specified at enquiry stage.
Quantity and Documentation
For project orders, provide the required quantity per diameter and grade combination. Request material grade confirmation or quality documentation from the Accurate Fastners team at the time of enquiry to support project records.
FAQs
Frequently asked questions
What is a sleeve anchor bolt and how is it installed?
A sleeve anchor bolt is inserted into a pre-drilled hole in a concrete or masonry substrate. Tightening the hex nut draws the bolt upward, expanding the sleeve against the hole walls to create a mechanical interlock. No access to the reverse face of the substrate is required.
Which stainless steel grades are available for these anchor bolts?
Accurate Fastners supplies anchor bolts in SS 202, SS 304 and SS 316. SS 304 is commonly used for general indoor and outdoor applications, while SS 316 is typically considered where chloride exposure or chemical contact is anticipated. SS 202 may suit less demanding environments.
What diameter sizes are available?
Anchor bolts are available in metric diameters from M8 to M20. If your project requires a size outside this range or a specific embedment length, please contact the Accurate Fastners sales team to discuss what can be accommodated on enquiry.
To which standards do these anchor bolts conform?
Accurate Fastners' fastener range is aligned with IS, BS and DIN standards. The metric thread form on these anchor bolts follows metric standard specifications. For documentation specific to a particular standard, please raise this requirement when submitting your enquiry.
What other fasteners are typically used alongside anchor bolts in an installation?
Installations involving anchor bolts often also require hex bolts, nuts, flat washers or spring washers for the secondary connections between structural members. Accurate Fastners supplies a broad range of stainless steel fasteners including these items, so complementary products may be sourced together.
How can I request a quotation for anchor bolts from Accurate Fastners?
Submit an enquiry through the website enquiry form with your required diameter, grade, quantity and any length or documentation requirements. You may also contact the team directly by email at export@accuratefastners.com or via WhatsApp for prompt assistance.
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