The long shank version of the dynamo eyebolt, for deep tapped holes and thick parent material where a standard shank cannot achieve full thread engagement. Insufficient engagement depth is one of the more common and serious errors in eyebolt use, and a long shank removes the problem where the material allows it.
**Everything else about a dynamo eyebolt still applies, and the most important part bears repeating: this is for vertical lifting only.** There is no collar, so nothing resists a sideways pull, and any angular load acts on the thread root — the weakest part of the component and the part you cannot inspect while it is fitted. There is no permitted angle and no derating table, because the design does not accommodate one.
If your lift involves a multi-leg sling, or any pull that is not straight up, you need a collared eyebolt.
Key Features
- Long shank: Full thread engagement in deep holes and thick parent material.
- Drop forged and heat treated: High tensile steel with the grain following the eye.
- 5:1 minimum breaking load to BS 4278.
- Six sizes: M8 through M30.
- Self colour or electro galvanised.
- Fully marked: CE, W.L.L., size and product ID mark.
Technical Specifications
| Product Code |
W.L.L. (t) |
A (mm) |
E (mm) |
F (mm) |
G (mm) |
H (mm) |
B (mm) |
D (mm) |
Weight (kgs) |
| EBDLSM8 |
0.15 |
8 |
22 |
9.5 |
27 |
100 |
19 |
6 |
0.11 |
| EBDLSM10 |
0.25 |
10 |
22 |
9.5 |
27 |
100 |
19 |
6 |
0.12 |
| EBDLSM12 |
0.32 |
12 |
29 |
11 |
35 |
100 |
25 |
8 |
0.17 |
| EBDLSM16 |
0.63 |
16 |
32 |
13 |
41 |
114 |
29 |
9.5 |
0.35 |
| EBDLSM20 |
1.25 |
20 |
41 |
16 |
54 |
127 |
35 |
11 |
0.6 |
| EBDLSM24 |
2 |
24 |
51 |
19 |
64 |
127 |
41 |
13 |
1.1 |
Working Load Limits and full dimensional data are on the specification sheet.
BS 4278 | MBL 5 x W.L.L. | VERTICAL LIFTING ONLY | LOLER Ready
Drop forged high tensile steel, heat treated, meeting the Working Load Limit performance requirements of BS 4278. Minimum breaking load is five times the W.L.L. This eyebolt has no collar and is for vertical lifting only. It must not be loaded at any angle. For angular loading use a collared eyebolt. Under LOLER 1998, thorough examination by a competent person at intervals not exceeding 12 months.
Suitable Applications
Machinery and equipment with a deep tapped lifting hole where the lift is genuinely vertical: motors, gearboxes, pumps, transformers and machine tools lifted straight up by a single point, in thick sections or counterbored holes where a standard shank would not engage fully. Where a load has multiple lifting points and is lifted by a multi-leg sling, the legs are at an angle by definition and collared eyebolts are required instead.
More About This Product
Lifting points are the only part of a lifting assembly that stays with the load, and that changes how they should be thought about. A sling belongs to the lifting company and gets inspected on a schedule. An eyebolt tapped into a gearbox belongs to the gearbox, gets painted over, corrodes quietly and is still expected to work five years later when someone needs to move the machine.
Which is why the thread and the tapped hole matter more than the eyebolt itself. The fitting is certified; the hole in the casting is not, and a worn, corroded or under-depth thread will fail long before the eyebolt does.
Angular Loading and Why the Collar Exists
The single most consequential distinction in this category is between a plain eyebolt and a collared one, and it comes down to what happens when the pull is not vertical.
A plain eyebolt has no machined face bearing on the load. Pull it sideways and the entire bending moment acts on the thread root — the point where the shank meets the thread, inside the hole, where nobody can see it. Alloy steel is strong in tension and much less tolerant of bending at a stress concentration, which is why plain eyebolts have no published derating table for angular load. There is no permitted angle because the design does not accommodate one.
A collared eyebolt has a machined face that seats hard against the load. Side load is resisted by that face rather than by the thread, which is why collared eyebolts carry a derating table and plain ones do not. The collar only works if it is fully seated — wound down onto a clean flat face with no gap. A collared eyebolt not tightened home is a plain eyebolt.
A swivel hoist ring removes the decision entirely: it pivots and rotates to align with the pull whatever direction that is, which is why it costs more and why it is the right answer where different people rig the same load.
How to Use the Long Shank Dynamo Eyebolt
- Confirm the lift is vertical: Single point, straight up. Any angle means the wrong component.
- Confirm the hole depth suits the long shank: Deep enough for full engagement, and the eyebolt must seat completely.
- Screw fully home: Seated against the face of the hole.
- Check the parent material: The W.L.L. assumes sound steel of adequate thickness.
- Inspect the thread before every use: Both eyebolt and tapped hole.
- Do not modify: Never weld, heat, machine or drill.
Warning: Dynamo eyebolts are for vertical lifting only. There is no permitted angular loading and no derating table. Angular load acts on the thread root and can cause sudden failure. For any angled lift, use a collared eyebolt or swivel hoist ring.
Safety Information
- Vertical lifting only. No angular loading is permitted.
- Never exceed the marked Working Load Limit.
- The eyebolt must be screwed fully home and seated.
- Confirm the tapped hole depth allows full engagement of the long shank.
- The parent material must be capable of carrying the load.
- Inspect the thread and tapped hole before every use.
- Withdraw any eyebolt showing thread damage, eye distortion, cracks or wear beyond the manufacturer’s stated limit.
- Never weld, heat treat, machine or repaint.
- Thorough examination by a competent person required at intervals not exceeding 12 months under LOLER 1998.
Inspection and Maintenance
Examine the full thread length for damage, stretching, corrosion and any sign of bending at the root — bending indicates it has been loaded at an angle and is grounds for immediate withdrawal, because it means the eyebolt has been used outside its design. Check the eye for distortion and elongation, measure against original dimensions and withdraw at the manufacturer’s stated wear limit. Inspect the seating face, since an eyebolt that cannot seat cleanly cannot develop its rating. Also inspect the tapped hole in the parent material, which sits outside the eyebolt's certification but fails just as readily.
Downloads
Frequently Asked Questions
Q: Can I use it at a slight angle?
No. There is no permitted angle and no derating figure. Without a collar there is nothing to take side load, and the bending acts on the thread root where you cannot see it. Even a small angle is outside the design.
Q: Long shank or standard?
Long shank where the tapped hole is deep or the material thick, so full engagement can be achieved. Standard where the hole depth suits it. An eyebolt that cannot engage fully is dangerous regardless of its rating.
Q: Which thread do I need?
Metric (EBDM, EBDLSM), UNC or Whitworth (EBCUNC, EBCBSW, EBCLSBSW). They are not interchangeable and the wrong thread will not engage correctly. Check the tapped hole before ordering.
