Lifting loops & sockets

Lifting loops and sockets are interrelated lifting components used in pre-cast concrete structures, manufacturing and building industries. They aid the safe transportation and placement of structural components.

Lifting loops

Designed for longevity, our lifting loops are manufactured from wire ropes clinched firmly into an externally threaded (standard ISO/DIN) metric or metric round form thread steel ferrule. On application this mates with permanently inserted steel socket of the same thread form and size.

The recommended Working Load Limit (WLL) is typically based on a 5 to 1 factor of safety of the wire rope minimum break loading, as per BS1290:1983. By arrangement a 6 to 1 factor of safety can be offered on metric round form (Rd) type loops.

Proof loading of 2 x WLL for the application is the normal practice. A test certificate is issued which can be easily referenced by an attached identification tag. Refer to the working load limit diagram for further information.

Standard ISO metric coarse thread (Safety Factor 5:1)
Thread (mm)		Working Load Limit (kN)	Nominal Dimensions (mm)
Size	Pitch		A Rope Dia	B Loop Dia	C Overall Length	D Ferrule Length	E Thread Length
M 12	1.75	5	6	50	155	27	22
M16	2.00	12	8	50	155	36	27
M 20	2.50	20	10	70	215	45	35
M 24	3.00	25	11	95	255	54	43
M30	3.50	40	14	130	303	68	56
M36	4.00	63	16	150	340	81	68
M42	4.50	80	20	180	425	95	80

Metric Coarse (round form) knuckle thread (safety factor 6:1)
Thread (mm)		Working Load Limit (kN)	Nominal Dimensions (mm)
Size	Pitch		A Rope Dia	B Loop Dia	C Overall Length	D Ferrule Length	E Thread Length
M 12	1.75	5	6	50	156	27	22
M16	2.00	12	8	50	156	36	27
M 20	2.50	20	10	70	216	45	35
M 24	3.00	25	12	95	256	54	43
M30	3.50	40	14	130	302	68	56
M36	4.00	63	18	150	342	81	68
M42	4.50	80	20	180	426	95	80

Lifting sockets

These strong steel tubular sockets are supplied with a through hole below the thread to take a reinforcing bar, located and tied to the main reinforcement to provide a secure anchorage point in the concrete.

Available in zinc plated steel or stainless steel, each socket is provided with two plastic plug inserts for protection against ingress of concrete or damage to threads. Plastic plugs can be obtained separately.

Note: Lifting loop and socket must be carefully matched to the correct thread form and size. (M) metric ISO threads are not compatible on thread form with (Rd) metric round form threads.

Standard ISO metric coarse thread (Safety Factor 5:1)
Thread (mm)		Working Load Limit (kN)	Nominal Dimensions (mm)
Size	Pitch		A Length	B Outside dia	C Hole size for bar	D Thread Length	E To centre of hole
M 12	1.75	5	40	15	8	16	28
M16	2.00	12	54	21	13	24	39
M 20	2.50	20	69	26	15	32	47
M 24	3.00	25	78	30	18	35	55
M30	3.50	40	103	39	22	45	71
M36	4.00	63	125	47	27	52	87
M42	4.50	80	145	54	32	64	92

Metric Coarse (round form) knuckle thread (safety factor 6:1)
Thread (mm)		Working Load Limit (kN)	Nominal Dimensions (mm)
Size	Pitch		A Length	B Outside dia	C Hole size for bar	D Thread Length	E To centre of hole
M 12	1.75	5	40	15	8	16	28
M16	2.00	12	54	21	13	24	39
M 20	2.50	20	69	27	15	32	47
M 24	3.00	25	78	31	18	35	55
M30	3.50	40	103	40	22	45	71
M36	4.00	63	125	47	27	52	878
M42	4.50	80	145	54	32	64	92

Advice and Information

If you are in any doubt about any aspect of a lifting operation, contact us. Our specialist team is always available to provide guidance on wire rope lifting systems.

Remember, the end user must use the lifting devices safely, in all aspects, within the scope of the current Health and Safety Regulations applicable.

Safe Working Load

Use the correct load distribution basins (available from Slingco) for angles over 45 degrees. Ensure full thread length of the lifting loop is engaged into the socket prior to the start of lifting. Use a suitable spreader beam when multi-point lifting is required to an angle greater than 45 degrees.

Allow for reduced ‘safe working load’ capacity as the angle of pull increases. Ensure the cane hook is compatible with the loop ‘eye’ size. Do not use undue undersize or oversized hooks or pins as this can reduce the ‘safe working load’ and life of the loop.

Lifting Safety Practices

The advantages of these modern lifting devices in the pre-cast concrete construction and building industries is widely accepted. Information on application uses and safe working practices is readily available from building equipment agents and stockists in a wide range of languages.

The end user must be fully compliant with all Health & Safety regulations. The correct information must be available at the concrete factory or construction site. Lifting equipment must be employed correctly and safely utilised within its prescribed limits.

Don't see the product you need?

Our range is continually developing and expanding - plus we frequently undertake custom engineering design - so if you don’t see the exact product you need, please contact us with your exact requirements.