Camlok THK Thin Sheet Horizontal Plate Clamp, 750-9000 kg

A reverse-jaw clamp for thin sheet that sags in the lift

The Camlok THK shares the basic design of the CH horizontal clamps but has a reversed tooth jaw. Camlok describes this as a safety feature for thin sheets that deflect, sag or flex: as the sheet bends under its own weight, the jaw grips harder. The clamps are used in pairs with a two-leg chain sling, and two pairs are recommended on longer plates.

Six sizes are listed, THK750 to THK9000, with a per-pair working load limit from 40 up to 9000 kg and jaw capacities of 0 to 25 mm up to 0 to 60 mm. The sling angle from the vertical must never exceed 30 degrees, and shackles are not included.

Points from the product page and datasheet

• Reversed tooth jaw that increases grip as the plate deflects
• Pairs on a two-leg chain sling; two pairs for longer plates
• Same basic design as the CH range, with jaws up to 60 mm
• Maximum sling angle 30 degrees from vertical
• Suited to thin plate with surface hardness under 300 Brinell (32 HRC)
• Service-friendly; repairs by a trained person; shackles not included

Technical specification

THK pair ratings

THK dimensions, mm

Handling limits

Selecting a size by plate thickness and load

The jaw capacity runs from zero, so thin sheet is covered by every size; the real limit is load. Both the THK750 and the THK1500 are very light at 3 and 6 kg per pair, while the THK9000 weighs 35 kg per pair (derived: the catalogue gives weight per pair). Choose the size with a WLL range that brackets the sheet weight, because each clamp has a minimum WLL marked on it that must not be undercut.

One discrepancy to note: the operating manual prints 75 to 500 kg for the THK1500, while the catalogue sheet and the model name say 75 to 1500 kg. The catalogue value is used here, and the figure marked on the clamp should be confirmed on order. Order shackles separately for the chain sling.

Handling thin sheet with THK clamps

The manual asks for sheet free of grease, oil, scale and coating. For a single pair, the clamps go on opposite edges in line with the centre of gravity with the sling slack; for long sheet use two pairs under a lifting beam. Endless chain slings and four-leg slings are ruled out, and round plates need three or more clamps to stop them tilting.

During the lift keep the sling within 30 degrees of vertical and any sideways pull under 15 degrees. Move slowly, keep slings vertical, stay clear of the load and put it down only when the whole weight is supported. If the sheet leans over by more than 5 degrees, reposition the clamps. The manual maintenance table covers smooth operation, weld cracks, shell plates, teeth cleaning, soft-grease lubrication, fasteners, jaw bolt and internal links, jaw wear and the locking cam handle; fasteners are held with Loctite 270 unless a nylon nut is fitted.

Thin plate and sheet handling

THK clamps are chosen where a sheet would sag between two ordinary clamps: cladding sheet, light plate, profiled panels and thin steel in cutting shops. Serrated teeth mark the sheet, so for polished or sensitive surfaces the LJ is the alternative. The manual asks the user to contact the supplier before use in humid, salty, caustic, alkaline, cold or hot conditions.

Selection and installation notes

Lifting clamps and grabs must be selected from the working load limit, the thickness and size of the load and the lifting angle, and used only by trained people under the site lifting procedure. Check the working load limit and the range on the marking, inspect the clamp before each use, never exceed the rated load or the stated angle, keep people away from the load and follow the periodic examination rules of the country where it is used. Damaged or worn clamps are taken out of service.

Information needed for a quotation

Send the full model code, the quantity, the delivery location in Oman or the GCC, the intended use and any accessories needed, so that the complete package can be quoted together.

Documents and supply information

The manufacturer data sheet is attached to this page and should be read together with the project specification and the site risk assessment before a purchase is confirmed. Ratings, standards and dimensions are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.

Related items

The product page lists the CH horizontal clamp, TTG girder stacking clamp, THS loading horizontal clamp, ACH adjustable horizontal clamp and RH/WH horizontal clamps as related products. A brochure, a product sheet and the manual are available from the maker. Shackles and chain slings are separate purchases.

Frequently asked questions

How is the THK rated?

Per pair, from 40 to 750 kg on the THK750 up to 450 to 9000 kg on the THK9000.

Why a reversed jaw?

Camlok says the reversed tooth design increases grip as the plate deflects, which helps with thin sheets that sag or flex.

What is the maximum sling angle?

30 degrees from the vertical; the manual also forbids lateral tensile forces above 15 degrees.

Can I use four-leg slings?

No. The manual says not to use endless chain slings or four-leg slings.

Are shackles included?

No, the product page and datasheet say shackles are not included.

Documents and quotation

The catalogue sheet and the THK manual are provided here. Because of the THK1500 figure noted above, ask for the marked capacity of the actual clamp before ordering. Seven Star LLC is an independent supplier in Muscat, and availability is confirmed per request.