Bolts
Wedge Anchor Through Bolt
Accurate Fastners manufactures and supplies stainless steel wedge anchor through bolts in M8 to M16 metric sizes, available in SS 202, SS 304 and SS 316 grades. Each assembly includes a threaded stud, expansion clip, nut and washer, ready for through-fixing into solid base materials.
- Standard
- —
- Grades
- 304 / 316 / 202
- Size
- M8 – M16
- Length
- On enquiry
Overview
What is the Wedge Anchor Through Bolt?
A wedge anchor through bolt is a mechanical expansion anchor designed to secure structural elements to solid substrates such as concrete, stone or dense masonry. The fastener is inserted through a pre-drilled hole in both the fixture and the base material, then tightened to expand an internal clip against the walls of the hole, creating a positive mechanical interlock that resists pull-out forces.
The assembly supplied by Accurate Fastners comprises four components: a metric-threaded stud, an expansion clip fitted near the base of the stud, a standard nut and a flat washer. When the nut is torqued, the stud is drawn upward relative to the clip, forcing the clip outward into the surrounding material. This through-bolt configuration means the anchor passes completely through the fixture before entering the substrate, ensuring the fixture itself is clamped firmly in place.
Wedge anchor through bolts are widely used where a secure, load-bearing connection to a concrete or masonry base is required and where the installer needs a standardised metric thread interface. The metric thread profile allows compatibility with common nuts, washers and associated hardware. Accurate Fastners produces these anchors under quality checks at both procurement and delivery stages, using high-quality raw materials throughout, and the range aligns with IS, BS and DIN fastener standards.
In Depth
Product description
Construction & Geometry
The wedge anchor through bolt consists of a cylindrical stud with a metric external thread running along most of its length. At the lower end, a pre-fitted expansion clip encircles a tapered or wedge-shaped portion of the stud body. The supplied nut and washer seat above the fixture face. The metric thread runs from M8 to M16 in diameter, offering a practical range for medium-duty through-fixing applications across various fixture thicknesses.
The expansion clip is typically a segmented or slotted sleeve of formed metal that rides on the stud's wedge section. Its outer diameter is sized to fit snugly within the drilled hole before expansion. Once the nut is turned, axial movement of the stud forces the clip outward radially. The washer distributes the clamping load across the fixture surface, reducing the risk of localised bearing stress on the material being fixed.
Functional Behaviour in an Assembly
Installation begins by drilling a hole of the correct diameter and minimum embedment depth through the fixture and into the solid base material. The anchor assembly is inserted so the expansion clip sits within the base material. As the nut is tightened, the stud is pulled upward, the wedge section drives the clip radially outward and the clip grips the hole walls. This mechanical interlock transfers tensile and shear loads from the fixture into the substrate.
The through-bolt configuration differs from an internally anchored bolt in that the threaded stud extends above the fixture, with the nut and washer providing the clamping surface. The assembly is therefore removable if the nut is released, though repeated removal may reduce the clip's holding performance. Correct hole diameter, embedment depth and tightening procedure are important factors; installers should follow the relevant engineering guidelines and substrate assessment for their specific application.
How It Differs from Similar Anchor Types
Wedge anchor through bolts are commonly distinguished from sleeve anchors and drop-in anchors by their single-piece stud-and-clip construction and the through-fixing principle. A sleeve anchor uses a full-length expanding sleeve and is often used for lighter-duty or hollow-base applications. A drop-in anchor is a female internally threaded insert that requires a separate bolt, whereas the wedge anchor through bolt presents its own external thread directly to the nut.
Compared with chemical or resin anchors, mechanical wedge anchors do not require curing time, making installation more straightforward in many situations. However, chemical anchors may be preferred in cracked concrete or where edge distances are limited, as general engineering guidance suggests mechanical expansion anchors perform best in solid, uncracked substrates. Accurate Fastners' range covers the wedge anchor through bolt type only; other anchor types may be confirmed with the sales team.
Material & Grade
Material and grade information
- SS 304
- SS 316
- SS 202
Accurate Fastners supplies wedge anchor through bolts in three stainless steel grades: SS 202, SS 304 and SS 316. SS 202 is an austenitic grade with manganese partially substituting nickel, offering a cost-considered option for indoor or dry environments where moderate corrosion resistance is acceptable. SS 304 is the most widely used austenitic stainless steel, commonly selected for general-purpose applications where exposure to moisture or mild chemicals is anticipated but aggressive chloride environments are not a primary concern.
SS 316 contains molybdenum, which typically improves resistance to chloride-induced corrosion compared with SS 304, making it a common choice for coastal, marine-adjacent or chemically demanding environments. Grade selection should consider the substrate type, environmental exposure, service temperature and any applicable project specifications. Customers unsure which grade suits their installation conditions are encouraged to discuss requirements with Accurate Fastners' sales team before placing an order, as the correct grade can influence long-term performance of the anchoring assembly.
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 – Wedge Anchor Through Bolt |
|---|---|
| Material | Stainless steel |
| Material grade | SS 304, SS 316, SS 202 |
| Nominal diameter / size | M8 – M16 |
| Length | To be confirmed on enquiry |
| Thread type | Metric |
| Head / form | Threaded stud with expansion clip, nut and washer |
| Drive / tightening | Tightened with nut |
Sizes
Available sizes
Documented size range
M8 – M16
Documented length range
On enquiry
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
Solar Energy Installations
Wedge anchor through bolts may be used to fix solar panel mounting frames and racking structures to concrete plinths or rooftop slabs, where a secure, corrosion-resistant connection to the substrate is required.
Food & Beverage Processing Equipment
Stainless steel grades such as SS 304 or SS 316 are commonly specified in food and beverage facilities to anchor machinery bases, mezzanine supports or equipment frames to factory floor slabs.
Pharmaceutical Machinery
Anchor bolts in SS 316 may suit pharmaceutical environments where hygiene standards and resistance to cleaning chemicals influence material selection for securing process equipment to concrete bases.
LED Lighting & Electrical Enclosures
Lighting columns, bracket supports and electrical panel enclosures fixed to concrete walls or floors may use wedge anchor through bolts where a reliable, removable mechanical fixing point is needed.
Submersible Pump Installations
Pump skids, motor bases and associated pipework supports anchored to wet or damp concrete plinths may benefit from SS 316 wedge anchor through bolts, given their general corrosion resistance in such environments.
Features & Selection
Features and selection considerations
Design features
Complete Assembly Supplied
Each anchor is supplied as a ready-to-install set comprising the threaded stud, expansion clip, nut and washer, reducing the need to source mating components separately.
Metric Thread Profile
The M8 to M16 metric thread range ensures compatibility with standard metric nuts and tools widely used across Indian and international construction and engineering projects.
Mechanical Expansion Mechanism
The wedge-driven clip expands radially on tightening, creating a positive mechanical interlock with the drilled hole walls without reliance on adhesives or chemical curing.
Three Stainless Steel Grades
Availability in SS 202, SS 304 and SS 316 allows buyers to select the grade most appropriate for their environment, from general indoor use to chemically or moisture-exposed settings.
Quality-Checked Production
Accurate Fastners' quality control team performs checks during both procurement and delivery, supporting consistent dimensional and material conformance across the supplied product range.
Before you order
Diameter & Thread Size
Select the bolt diameter from M8 to M16 based on the load requirement and the fixture hole pattern. Confirm the required metric thread pitch with the sales team if a specific pitch is needed.
Material Grade
Choose SS 202 for dry indoor settings, SS 304 for general corrosion-resistant applications and SS 316 where chloride or chemical exposure is a concern. Confirm grade suitability with your project specification.
Embedment Depth & Fixture Thickness
The overall anchor length must accommodate the fixture thickness plus the required embedment depth into the base material. Confirm the specific length options available with Accurate Fastners' sales team on enquiry.
Quantity & Documentation
For B2B orders, provide the quantity per diameter and grade when requesting a quotation. Ask the sales team about batch documentation, material certificates or compliance with IS, BS or DIN standards as needed.
FAQs
Frequently asked questions
What base materials are wedge anchor through bolts typically used with?
Wedge anchor through bolts are commonly used in solid, uncracked concrete and dense masonry substrates. They are generally not recommended for hollow blocks or soft materials, as the expansion mechanism relies on resistance from the surrounding base material to develop grip.
Which stainless steel grades are available for this product?
Accurate Fastners supplies this anchor in SS 202, SS 304 and SS 316. SS 304 is a general-purpose choice; SS 316 adds molybdenum for improved chloride resistance; SS 202 offers a cost-considered option for less demanding indoor environments. Grade selection should suit the installation conditions.
What diameter range does Accurate Fastners offer for these anchors?
The wedge anchor through bolt is available from M8 to M16 in metric diameter. For specific length options or embedment depth requirements beyond this range, please contact the sales team directly, as details are confirmed on enquiry.
Do these anchors comply with any recognised standards?
Accurate Fastners' fastener range is produced to align with IS, BS and DIN standards. For specific standard compliance documentation relevant to your project or procurement requirement, confirm the details with the sales team before ordering.
What additional components are included with each anchor?
Each wedge anchor through bolt is supplied as a complete assembly including the threaded stud, expansion clip, nut and washer. This means no separate hardware sourcing is needed for a standard installation, though project requirements should be confirmed at the time of ordering.
How can I request a quotation from Accurate Fastners?
You may submit an enquiry through the website enquiry form, email the team at export@accuratefastners.com or contact via WhatsApp. Please include the required diameter, grade, approximate quantity and any standard or documentation requirements to receive an accurate quotation promptly.
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