Zinc Plated Square Nuts, GB Standard Carbon Steel for Timber Frame
These zinc plated square nuts are carbon steel, with a square body, four chamfered corners, a chamfered top edge and a blue-white zinc coating. The square form does the work: pulled into a timber pocket or held flat against a plate, the nut cannot spin, so one wrench is enough. That is why square nuts for timber frame construction are used with coach bolts, washers and connector plates in decks and frame joints. As GB standard square nuts, the geometry follows the GB designation in the product title; standard number and property class are confirmed on the drawing. Coating, chamfer, thread and packaging can be customized.
5.0
Sample:
Y
Quality control:
Y
Packing:
Carton Boxes+Plastic Bags,support customized
Brand name:
GG
Product name:
Square Nuts
MOQ:
10000PCS but can negotiate
Place of origin:
China
OEM&ODM:
Y
Certificate:
ASME JIS ISO
Quality guarantee:
100% Inspection
Material and treatment:
support customized
After-sales service:
Y
Finish:
support customized
Material:
Stainless Steel Carbon Steel,support customized
design customization
Please fill out the form below to request a quote or to request more information about us. Please be sure to upload customized requirement documents or pictures, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
Please fill out the form below to request a quote or to request more information about us. please be as detailed as possible in your message, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
Structure and Design
| Element | What the photos show | Function |
|---|---|---|
| Square body | Four straight sides at 90 degrees | Sits in a square pocket or against a flat plate so it cannot rotate |
| Chamfered corners | All four corners cut at an angle, so the outline reads as a square with cut corners rather than four sharp points | Removes sharp points that would crush timber fibres, and eases entry into a pocket |
| Chamfered top edge | Top rim bevelled inward | Removes burr, guides the washer, and reduces snagging during assembly |
| Through thread | Internal thread runs the full thickness | Full engagement on a coach bolt or threaded rod |
| Bearing faces | Flat top and bottom faces | Spreads load over a wider area than a hex nut of similar height |
| Zinc coating | Bright blue-white metallic layer | Barrier plus sacrificial protection for carbon steel |
Why a Square Nut Stops Rotation
| Situation | Hex nut | Square nut |
|---|---|---|
| Nut dropped into a blind pocket in timber | Rounded corners leave little to grip; the pocket must be shaped to the hex | Square corners bear against the pocket walls, so the nut is locked |
| Nut placed against a steel plate or bracket | Can rotate until the flats catch | Sits flat on four sides, so rotation is blocked immediately |
| Access limited to the bolt head only | Needs a second wrench on the nut | Installs from one side |
| Load spread on soft material | Smaller contact area | Larger flat area spreads pressure on timber |
| Visual finish on exposed work | Common, industrial | Squarer, more traditional look suited to timber structures |
GB Standard — What Is and Is Not Confirmed
| Item | Status |
|---|---|
| Standard family | GB, as stated in the product name |
| Specific standard number | Not printed in the images; confirm on the drawing or ask for it in writing |
| Thread type | Metric, per the drawing |
| Property class / strength grade | Not marked in the images; state the required grade on the order if the joint is load-bearing |
| Tolerance class | Not stated; confirm with the drawing |
| Coating specification | Zinc plated, blue-white appearance; coating thickness not stated |
The product title uses the word "strength", but the photos show no grade stamp. Treat the strength level as an open item to be fixed by the purchase drawing, and do not assume a class from the appearance.
Specification Checklist — How to Order Without a Published Chart
| Parameter | What to state | Why it matters |
|---|---|---|
| Thread size | e.g. M8, M10, M12 | Sets the bolt and the tapped hole |
| Thread pitch | Coarse or fine | Fine pitch is used where vibration loosening matters |
| Width across flats | Square side dimension | Must match the pocket or the wrench |
| Thickness | Nut height | Affects thread engagement and pocket depth |
| Corner chamfer | Chamfer size or "sharp corner" | Determines whether it fits a tight square pocket |
| Top edge chamfer | Chamfer size | Affects washer seating |
| Property class | e.g. grade 8, or "not specified" | Governs load capacity |
| Coating | Blue-white zinc, thickness if required | Governs corrosion life and appearance |
| Packing | Bag, box, carton, bulk | Affects handling and freight |
Material and Coating
| Aspect | Detail |
|---|---|
| Base material | Carbon steel, per the product name |
| Coating | Zinc plated, blue-white |
| How zinc protects | Acts as a barrier and, where scratched, sacrifices itself before the steel |
| Suitable environment | Indoor, covered outdoor, and timber structures protected from standing water |
| Where it is weaker | Prolonged wetting, soil contact, acid or chloride exposure, and cut or damaged edges |
| Upgrade options | Thicker zinc, hot-dip galvanizing, or stainless steel where the structure is permanently wet |
Installation in Timber
| Step | Action | Reason |
|---|---|---|
| 1 | Confirm the bolt diameter and the nut thread match | Zinc coating slightly reduces clearance; check by hand-threading first |
| 2 | Cut a square pocket if the nut must sit below the surface | The pocket walls provide the anti-rotation reaction |
| 3 | Fit a washer under the nut | Spreads load and protects the timber surface |
| 4 | Tighten from the bolt head side only | The square nut is restrained by the pocket or plate |
| 5 | Stop at the point the washer just beds | Over-tightening crushes timber fibres and loosens the joint later |
| 6 | Re-check after the timber settles | Seasoned timber shrinks, so joints may need a second pass |
Typical Applications
These are standard uses for a square nut in timber work. The images show the product only and do not list applications.
| Application | Why a square nut fits |
|---|---|
| Timber frame joints | Sits in a pocket and resists rotation where access is limited |
| Decking substructure | Pairs with coach bolts through joists and bearers |
| Fencing and gates | Square nut bears against a flat plate on the post |
| Formwork and shoring | Reusable connections that must come apart quickly |
| Garden structures and pergolas | Traditional appearance suited to exposed timber |
| Playground and outdoor furniture | Wide bearing face on soft material |
| Machine bases and guards | Anti-rotation where the nut side is boxed in |
Quality Checkpoints
| Checkpoint | What is checked | Method |
|---|---|---|
| Thread | Size, pitch, go/no-go, run-through | Thread gauges and matching bolt |
| Square dimensions | Width across flats, squareness | Calliper and square check per batch |
| Thickness | Nut height within tolerance | Micrometer per batch |
| Chamfer | Corner chamfer size, top edge chamfer | Visual and sample comparison |
| Coating | Coverage, colour uniformity, no bare patches | Visual against a sealed sample |
| Thread after coating | Hand-thread a bolt after plating | Functional check, since plating builds on threads |
| Surface | Burrs, cracks, folds | Visual inspection |
| Material | Grade confirmation | Mill certificate or in-house verification |
Customization — Product and Packaging
| Area | Adjustable | Buyer provides |
|---|---|---|
| Thread size | Metric sizes per drawing | Size list |
| Thread pitch | Coarse or fine | Pitch requirement |
| Width and thickness | Per drawing | Drawing with tolerances |
| Corner form | Chamfered corner or square corner | Drawing or sample |
| Material | Carbon steel; other grades on request | Grade requirement |
| Coating | Blue-white zinc, thicker zinc, hot-dip | Coating standard and thickness |
| Marking | Grade stamp, logo, size marking | Artwork and position |
| Packaging | Poly bag, box, carton, bulk | Packing method and quantity |
| Label | Logo, size table, barcode | Artwork and label copy |
| Carton | Mark, packing list, carton size | Marking file and shipping data |
FAQ
Q1. What makes a square nut anti-rotation?
Its corners. In a square pocket or against a flat plate, the four sides bear on the surrounding material, so the nut cannot turn while the bolt is tightened. A hex nut has less contact in the same pocket.
Q2. Are these zinc plated square nuts carbon steel or stainless?
Carbon steel with zinc plating, per the product name. Stainless is a different product line; if the structure stays wet, ask for it explicitly rather than assuming the plating is enough.
Q3. Which GB standard applies?
The product name states GB, so the item is quoted as GB standard square nuts. The specific standard number is not printed in the images, so confirm it on your drawing or request it in writing before ordering.
Q4. What strength grade are they?
The images carry no grade stamp and the page does not claim one. If the joint is load-bearing, state the required property class on the order so the correct grade is quoted.
Q5. Do you have a size chart?
The images do not include one, and inventing dimensions would be misleading. Send the thread size, across-flats, thickness and chamfer you need, or a drawing, and the values will be matched to it.
Q6. Why are the corners chamfered instead of sharp?
Cut corners remove the sharp points that would crush timber fibres and make the nut easier to seat in a pocket. A sharp-cornered version can be produced if the pocket is machined square.
Q7. Can these square nuts for timber frame construction be used with coach bolts?
Yes, that is a common pairing, with a washer under the nut. Check that the bolt thread matches the nut and that the washer diameter covers the nut face.
Q8. How much torque should I apply?
No torque value is published here. In timber the limit is usually the wood's bearing strength, so set torque from the timber specification and bolt grade, then verify on a sample joint.
Q9. Will the zinc coating survive outdoors?
Blue-white zinc is a normal choice for covered outdoor work, but it is not a long-term answer for soil contact, standing water or salt. For those conditions specify thicker zinc, hot-dip galvanizing or stainless.
Q10. Does plating affect the thread fit?
Yes. Zinc adds thickness, so a plated nut can feel tight on a plated bolt. Confirm the coating allowance, and always test-thread a bolt before mass assembly.
Q11. Can the width, thickness or chamfer be customized?
Yes. Dimensions, corner form, top chamfer and thread can all be produced to a drawing or sample.
Q12. Can you mark our logo or the grade?
Yes, grade stamps, size markings and logos can be applied, with position and depth agreed before production.
Q13. How are they packed?
Poly bag, box, carton or bulk, with custom labels and barcodes. Quantity per pack and carton data are confirmed per order.
Q14. Is there a certificate or test report?
If your project requires a material certificate, coating thickness report or salt-spray result, request it at quotation stage.
Send your drawing or the thread size, width across flats, thickness, chamfer, property class and coating requirement to receive a quotation for GB standard zinc plated square nuts, with samples for pocket fit and custom marking or packaging for your own brand.
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Contact: Angel
Contact number: +86 18602085825
Email: angel@ganggus.com
WhatsApp: +86 18602085825
Address: Room 101, Building 2, No.11 jintang Road,changping Town, Dongguan City, Guangdong Province, CN
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