Washer Flat M12X27X2.5 M Hot Dip Galvanized
- 1 unit
- 10 units
- 30 units
- 200 units
- 800 Units
screws
nuts
washers
Threaded Rod
Boxes / Tools
Chandlery
| Number of pieces | 1 | 10 | 100 |
| Lot price VAT included | £3.17 | £27.33 | £244.40 |
How do I measure the length of a screw?
The length of a countersunk screw is measured with the head. For all other heads, the length is measured under the head.
Current mechanical classes of screws in accordance with ISO 898-1
Meaning of class 8.8:
The first number (8) indicates the ultimate tensile strength of the material, expressed in hundreds of MPa (megapascals).
Here, 8 × 100 = 800 MPa ultimate tensile strength.
The second number (8) indicates the ratio between yield strength and ultimate tensile strength, multiplied by 10.
Here, 8 means that the yield strength is 0.8 times the ultimate tensile strength.
So, yield strength = 0.8 × 800 MPa = 640 MPa.
Mechanical classes of screws (common examples)
Class Tensile strength (MPa) Yield strength (MPa) Typical use
4.6 400 0.6 × 400 = 240 Low-strength screw, light use
5.6 500 0.6 × 500 = 300 General light to medium duty
8.8 800 0.8 × 800 = 640 High strength, mechanical, construction
10.9 1000 0.9 × 1000 = 900 Very high strength, demanding applications
12.9 1200 0.9 × 1200 = 1080 Ultra high strength, heavy industrial use
Additional explanations:
Ultimate tensile strength: maximum load the screw can withstand before breaking.
Yield strength: maximum load before plastic deformation (permanent and irreversible).
The higher the class, the stronger the screw, but it is also often more brittle (can break suddenly without much bending).
Lower classes are used for assemblies that are less subject to high stresses.
Unmarked screw = class 4.6 or equivalent (generally)
In general, an unmarked screw is a low-strength screw, often made of mild steel or standard steel.
It may correspond to a class 4.6 (tensile strength ~400 MPa, yield strength ~240 MPa) or sometimes even lower.
These screws are suitable for assemblies not subject to high mechanical stress.
Why are they suitable?
Screws in higher classes (8.8, 10.9, 12.9, etc.) must be marked to guarantee their quality and traceability.
The absence of marking often means that the screw is not standardised or is of low quality.
All our zinc-plated parts meet this specification (unless otherwise stated).
🛡️ Corrosion protection: low
Thin 3 to 5 µm zinc coating, suitable for environments with low exposure.
🧂 Salt spray resistance: 24 to 96 h
Indicative resistance before the appearance of rust, depending on the coating finish.
🏠 Recommended environment
Indoor applications or environments with very low exposure to moisture.
🔩 Threads preserved
The low coating thickness limits dimensional variations and helps maintain thread accuracy.
| Diameter | 3 | 4 | 5 | 6 | 7 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 27 | 30 | 33 | 36 | 48 | 52 | 56 |
| Pitch | 50 | 70 | 80 | 100 | 100 | 125 | 150 | 175 | 200 | 200 | 250 | 250 | 250 | 300 | 300 | 350 | 350 | 400 | 500 | 500 | 550 |
timber frame reinforcement on 75/200 timber beams
For fixing a 2m high gate post on a 2.5m span. Ground anchoring to a depth of 20 cm using chemical sealing.
To secure a wall plate against the wall using chemical anchoring Douglas fir sourced from a sawmill near my home, 80x160mm wall plate
Joist lashing installation Lashing performed with 45x220x4m framing timber, C24, class 2. 9 clamping points with threaded rod over 4m of joist
Assembly of purlins Self-build cabin
Fixation d'une muralière Par scellement chimique
charpente ,projet garage construction charpente garage
ESCALIER ACIER FIXATION LIMON ESCALIER MUR PARPAING
renovation chargfeuyr
je l'utilise pour de la charpente bois
pose sur muraliere charpente en poutre posi
Assemblage mecanique sur des bancs de test
Assemblage de presse Tige filetée M12 classe 8
fixation de muraliere de terrasse fixation de muraliere de terrasee en bois douglas de 60*180
Fixation de bastaings de part et d'autre d'une poutre abîmée pour la renforcer en mettant des tiges filetées tous les 60 cm.
Did I make a mistake? I ordered 100 instead of 1000 (1 meter) To reinforce my gabions ;)
Threaded rods are designed for beam assemblies Threaded rod M12, 1m long
Assembling the wooden frame of my garage
timber frame assembly M12 class 8.8 length 1 m
Fence post fixing Fixing 1.70m fence post, drilling for M12 and chemical anchoring
Renovation of a wooden frame on an agricultural building M12 threaded rod, 1 meter long, Class 8.8, galvanized steel
Agricultural building frame renovation M12 threaded rod, 1 m length, Class 8.8, zinc-plated steel
garage frame anchoring in load-bearing walls
Garage frame assembly and construction
Timber frame construction Timber frame construction
for reinforcing a wall splicing a cracked wall with a threaded rod passing through and splices on either side of the wall
To fix structures in a brick wall Seal with chemical anchoring, for our stairs, railings sign s Concept Metal.
This product will be used to fix two 50 x 150 mm wooden wall plates to concrete walls for the construction of a floor in a barn. The threaded rods will be cut to 160 mm and chemically anchored in the wall to support the joists. M12 1000 mm threaded rods, Class 8.8, zinc-plated steel, DIN 975 standard. Used with M12 nuts and washers, as well as 20 x 85 mm injection sleeves and sealing resin. Project: 11.62 x 7.61 m wooden floor on steel beams.
Installation of supporting walls for a mezzanine 15 m garage mezzanine
Rod intended to assemble wooden beams to make the posts of a carport The sections of the posts will be made up of 3 fir planks of 75mmx200mm
Threaded rods for fixing a wall in concrete blocks.
Support Hardware Support
Use to fix a wall. Fixing a rear light for a terrace.
Carport Manufacturing 6mx6m manufacturing for 2 cars. Custom manufacturing brand
SEALING GARDEN SHED CONCRETE SLAB THREADED ROD 12
Sealing garden shed concrete slab threaded rod
Anchoring a wall beam to create a mezzanine I have to put 13 threaded rods of 26cm so I need 8 rods of 1m in class 8.8 for a better hold
Frame assembly Resinous wood or oak
AGRICULTURAL BARRIER FASTENERS FROM 60 to 280KG
wall mounting 80mm thick wall mounting
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2026-08-23
I will cut the 12mm threaded rods to 250mm lengths to bolt wooden beams to a stone wall. 10 x M12 Threaded Rods, 1m Length, Class 8.8, Zinc-Plated Steel, Reference 3347120002_10