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Leading UK Manufacturer of BS 4278 Imperial Collared Eyebolts.

We specialise in the precision manufacture and supply of high-integrity imperial collared eyebolts produced in strict accordance with BS 4278 specifications, engineered for safe overhead lifting, rigging, and structural anchoring.

Utilising advanced closed-die drop forging and upset forging processes, we compress and align the material's grain flow along the contours of the component, delivering elite tensile strength, ductility, and fatigue resistance compared to machined or cast alternatives.
Whether for heritage equipment maintenance, legacy machinery support, or bespoke engineering projects, we provide a complete, certified manufacturing solution.


collared eyebolts to BS4278 metric diagram drawing

BS4278 Imperial Collared Eyebolt Technical Dimensions and Safe Working Load Specifications (To Table 4)
A B D E F G H SWL
Vertical Only
Weight Each
Inches mm mm mm mm mm mm Tonnes kgs
3/8 22 7 15 9 20 18 0.25 0.08
1/2 29 10 20 12 26 23 0.50 0.14
5/8 36 12 24 14 32 28 0.90 0.38
3/4 45 15 30 18 40 35 1.40 0.60
7/8 52 17 35 21 46 40 2.00 0.78
1 58 20 39 23 52 46 2.75 1.67
1. 1/8 65 22 44 26 58 51 3.50 1.78
1. 1/4 72 24 48 29 64 56 4.50 2.24
1. 1/2 86 29 57 33 76 67 6.50 3.17
1. 3/4 101 34 68 40 90 79 9.00 6.00
2 115 38 76 46 102 89 12.00 9.00
2. 1/4 128 43 86 51 114 100 15.00 15.00
2. 1/2 144 48 96 58 128 112 20.00 18.20
3 172 57 114 67 153 133 30.00 30.40