Masonry bolts, also called screw bolts or screw-in anchors, are hardened steel screws that cut their own thread into a pre-drilled hole in concrete, brick or block. They need no plug or expansion sleeve, install quickly with an impact driver and can be removed if the fixture moves.
Linkworld supplies masonry bolts from M6 to M16 in hardened carbon steel, with hex flange and countersunk heads and zinc, yellow zinc or mechanically galvanised finishes. We pack in bulk cartons or in your own branded packs, and other sizes can be made to your drawing or sample.
Masonry Bolt Specifications
| Specification | Configuration |
|---|---|
| Product | Screw bolt / masonry bolt / screw-in anchor |
| Material | Hardened carbon steel |
| Sizes | M6 to M16 |
| Common lengths | 50 to 150 mm |
| Head | Hex flange or countersunk |
| Finish | Zinc, yellow zinc or mechanically galvanised |
| Base materials | Concrete, solid and hollow brick, solid and hollow block |
| Packing | Bulk cartons, own-brand boxes, buckets and small packs |
Other sizes and finishes can be made to drawing or sample.
Where Masonry Bolts Are Used
- Steel brackets and base plates fixed to concrete floors and walls
- Timber to masonry ledgers, bottom plates and battens
- Racking and shelving bases fixed to concrete slabs
- Services cable trays, pipe clips and unistrut
- Gates, posts and fencing base plates on concrete
Choosing a Masonry Bolt
- Head style: hex flange for brackets and plates, countersunk where the head must sit flush.
- Diameter and length: cover the fixture thickness plus the embedment the manufacturer or designer requires.
- Finish: zinc or yellow zinc for dry interior use; mechanically galvanised for outdoor use.
- Base material: tell us whether you are fixing into concrete, brick or block, solid or hollow.
Anchor selection for structural or overhead fixings should follow the project design.
Common Purchasing Mistakes
Treating screw bolts and sleeve anchors as the same. A screw bolt cuts its own thread; a sleeve anchor expands in the hole. They are different products.
Ordering by diameter only. Give the length as well, based on fixture thickness and embedment.
Using zinc bolts outdoors. Zinc plated bolts suit indoor work. Specify mechanically galvanised for outdoor jobs.
One code for hex and countersunk. Give each head style its own item code and label.
What to Send with Your Enquiry
| Item | What to tell us |
|---|---|
| Size | Diameter and length |
| Head | Hex flange or countersunk |
| Finish | Zinc, yellow zinc or mechanically galvanised |
| Quantity | Quantity for each size |
| Packing | Bulk carton, own-brand box, bucket or small pack |
| Destination | Destination port |
Packing and Supply for Distributors
We pack masonry bolts in bulk cartons for trade distribution, or in your own branded boxes, buckets and small packs for retail. Each size can carry its own label. For customers who plan several deliveries through the year, we offer free warehouse storage and staged shipments.
Work With Linkworld
Linkworld has more than 20 years of fastener export experience and runs its own cold heading workshop. Our own QC team checks thread, hardness, head form and coating in our inspection room before every shipment. We make anchors to drawing or sample, so special lengths, heads and finishes are welcome.
Frequently Asked Questions
What is a masonry bolt?
A masonry bolt, or screw bolt, is a hardened screw that cuts its own thread into a drilled hole in concrete, brick or block, with no plug or sleeve.
What sizes of screw bolts do you supply?
M6 to M16, in lengths of about 50 to 150 mm. Other sizes can be made to drawing.
Can masonry bolts be removed?
Yes. Screw bolts can be unscrewed, which makes them useful for temporary fixings and fixtures that may move.
Which finish should I choose?
Zinc or yellow zinc for dry indoor use, and mechanically galvanised for outdoor use.
What is the difference between masonry bolts and countersunk concrete screws?
Masonry bolts usually have a hex flange head for brackets and plates. Countersunk concrete screws sit flush with the fixture.
Looking for masonry bolts in your own sizes or packs?
Send the sizes, head style, finish, quantity and packing you need through the enquiry form below, and our team will reply with the options that fit your range.
Send an Enquiry
Send a drawing, sample or clear reference photo. Add the quantity and application if available, and we can start from the information you already have.