C.A. GALVIN LTD











Alvin Key Clamps are distributed countrywide from our extensive stocks. Alvin Key Clamps are manufactured to the highest quality using the finest materials and the most modern plant and machinery.


THE RANGE

 A2  
Tube Ø A B C D E F
5 44 36 - - - -
6 48 44 - - - -
7 60 54 - - - -
8 68 54 - - - -
9 85 75 - - - -

Provides 90° 'T' connection between two tubes. Used for the joint between end post and lower rail(s) when handrail is straight and level. Also for a top 'T' joint on a guardrail. Cannot join tube in top of 'T', use the A4 when this is required.


 A3  
Tube Ø A B C D E F
5 - - - - - -
6 54 73 - - - -
7 63 89 - - - -
8 68 102 - - - -
9 - - - - - -

Variable angle clamp, tubes can be connected between angles of 30° to 60°. Use for an angled top rail joint to vertical post on stairs. Used in conjunction with A23 for the lower rail(s). Can be used for diagonal braces for racking etc.


 A4  
Tube Ø A B C D E F
5 88 44 - - - -
6 96 48 - - - -
7 120 60 - - - -
8 136 68 - - - -
9 170 85 - - - -

Provides a 90° 'T' connection between two tubes. Used for the joint between a top rail and a vertical post. Allows tubes to be joined in the top part of the 'T'. When used in guardrailing the A22 will compliment this for lower rail(s).


 A6  
Tube Ø A B C D E F
5 44 - - - - -
6 48 - - - - -
7 60 - - - - -
8 68 - - - - -
9 86 - - - - -

This is a 90° elbow joint. Used frequently for the termination of the top rail to the last post of a handrail. Also used for turning the rails around a 90° corner.


 A7  
Tube Ø A B C D E F
5 - - - - - -
6 90 - - - - -
7 106 - - - - -
8 120 - - - - -
9 - - - - - -

Two tubes can be joined with an angle range of between 105° - 165°. Joins the angled rail from a ramp or steps to level rails on a landing. Starts an angled rail from top of a first post. Can be used for obtuse angle change in a handrail.


 A8  
Tube Ø A B C D E F
5 64 - - - - -
6 90 - - - - -
7 96 - - - - -
8 96 - - - - -
9 125 - - - - -

Provides a rigid joint for two tubes of the same diameter. Joints to be 150mm to the nearest support. Do not use for joining two tubes subject to extreme loads, i.e. a vertical post member supporting a guardrail. Use A9 for a streamline joint.


 A9  
Tube Ø A B C D E F
5 - - - - - -
6 78 20 - - - -
7 78 20 - - - -
8 80 22 - - - -
9 - - - - - -

Provides a streamline flush joint in two tubes of the same dia. with a max. wall thickness 3.2 mm. Joints to be 150mm to the nearest support. Not for joining tubes that are subject to extreme loads, or where a direct tensile load is applied.


 A10  
Tube Ø A B C D E F
5 63 48 81 7 4 -
6 65 48 84 7 4 -
7 75 51 98 9 6 -
8 85 54 112 11 6 -
9 96 60 130 11 6 -

A four holed plate providing a rigid fixing for handrails that terminate on walls. Ideal for securing garment railing structures to ceilings etc. Not to be used as structural fixings for supporting a vertical post on guardrails. Use A12 for this.


 A12  
Tube Ø A B C D E F
5 112 76 64 76 11 8
6 128 88 80 88 14 10
7 144 102 80 88 14 10
8 156 114 92 88 14 10
9 165 126 98 130 14 10

Provides a structural base plate for the support of a vertical post typically for a guardrail. Two socket set screws give a rigid structural fixing. Recommended that the fixing down bolts be in line with the applied load.(i.e 90° to the rails)


 A14  
Tube Ø A B C D E F
5 - - - - - -
6 104 64 68 44 98 14
7 114 64 74 50 112 14
8 120 64 90 60 124 14
9 - - - - - -

Base for vertical posts for side mounting. Posts stand off from structure. Tube cannot pass through this clamp. Access to top fixing hole restricted, a threaded stud type bolt projecting a max. 25mm from structure needs to be fixed first.


 A15  
Tube Ø A B C D E F
5 - - - - - -
6 63 25 71 11 24 6
7 72 23 82 11 28 6
8 78 23 86 11 31 6
9 - - - - - -

Provides a structural base plate to a vertical post that is required to be side mounted. This clamp is virtually flush to structure it is being fixed to. The tube does not pass through the clamp.


 A16  
Tube Ø A B C D E F
5 - - - - - -
6 114 64 24 66 98 14
7 114 64 27 76 104 14
8 120 64 30 86 114 14
9 - - - - - -

Provides a structural base plate as the A14, should not be used for heavy duty applications.


 A17  
Tube Ø A B C D E F
5 - - - - - -
6 126 125 - - - -
7 140 135 - - - -
8 140 138 - - - -
9 - - - - - -

A ground socket that is cast into concrete and is flush with the finished ground level. Allows posts to be inserted and retained with a locking set screw. Posts can be easily removed at any time.


 A18  
Tube Ø A B C D E F
5 44 - - - - -
6 48 - - - - -
7 60 - - - - -
8 68 - - - - -
9 - - - - - -

Provides a three way 90° corner joint. Used frequently for a top rail 90° turn where a post is present. Compliment this with A20 for a lower rail. Also used for corner joints on structures such as work benches, tables etc.


 A20  
Tube Ø A B C D E F
5 44 - - - - -
6 48 - - - - -
7 60 - - - - -
8 68 - - - - -
9 85 - - - - -

A 90° corner joint, tube passes through the central hole. Used frequently for a lower rail(s). Often used in conjunction with the A18.


 A21  
Tube Ø A B C D E F
5 - - - - - -
6 58 - - - - -
7 73 - - - - -
8 81 - - - - -
9 - - - - - -

Generally used in pairs (as shown). Allows angles between 90° - 180°. Used to change direction of rails in the same plane. Requires a central tube at the point of angle change. Consider the A7 as an alternative for the angle change.


 A22  
Tube Ø A B C D E F
5 88 - - - - -
6 96 - - - - -
7 120 - - - - -
8 136 - - - - -
9 175 - - - - -

Used for a 90° connection of a lower rail(s) to an intermediate vertical post, the vertical post must remain continuous while the rail is joined in each side of the clamp. Usually complimented with the A4 when used for guardrailing.


 A23  
Tube Ø A B C D E F
5 - - - - - -
6 146 - - - - -
7 178 - - - - -
8 216 - - - - -
9 - - - - - -

Variable angle clamp enables tubes to be connected between angles 30° - 45°. Used for angled lower rail(s) joint to a vertical post on stairs. A3 can be used in association for top rail connection. A46 swivel clamp is an alternative.


 A24  
Tube Ø A B C D E F
5 88 44 - - - -
6 96 48 - - - -
7 120 60 - - - -
8 136 68 - - - -
9 176 88 - - - -

Frequently used to tie uprights with horizontal tubes in three directions all at 90° to the upright.


 A26  
Tube Ø A B C D E F
5 32 82 82 - - -
6 43 96 96 - - -
7 48 120 120 - - -
8 50 136 136 - - -
9 54 175 175 - - -

Frequently used in structures that have many uprights, such as racking. This clamp ties a centre upright, which passes through the central hole, with four horizontal tubes. All connections are at 90° to each other.


 A28  
Tube Ø A B C D E F
5 36 32 - - - -
6 42 40 - - - -
7x6 54 40 - - - -
7 54 49 - - - -
8x6 60 40 - - - -
8 60 54 - - - -
9 62 68 - - - -

Gives 90° crossover joint. Used in guardrail installations. Rails are passed through in long lengths and joined using the A8 or A9. Can be used for connection of a horizontal racking member to a vertical support, garment rails etc.


 A30  
Tube Ø A B C D E F
5 31 35 41 - - -
6 42 40 48 - - -
7 54 49 60 - - -
8 60 54 68 - - -
9 62 68 86 - - -

This clamp is used on racking for the 90° connection of a vertical support to a horizontal load carrying rail. The rear outlet is available for a horizontal tie across the section.


 A31  
Tube Ø A B C D E F
5 - - - - - -
6 56 33 33 - - -
7 62 42 36 - - -
8 72 48 41 - - -
9 - - - - - -

Offset handrail spigot clamp accepts tube through top of the 'T', the spigot inserts directly into another clamp. Used for off setting rail from a post, can be rotated through 360°. Used with A6 and A2. Also use with A10 for wall mounted rail.


 A32  
Tube Ø A B C D E F
5 50 - - - - -
6 54 - - - - -
7 64 - - - - -
8 74 - - - - -
9 90 - - - - -

Used for adding to and modifying an existing structure. Similar to the A2.


 A34  
Tube Ø A B C D E F
5 76 57 55 45 8 5
6 92 62 58 48 10 10
7 64 84 60 48 10 10
8 74 84 68 54 10 10
9 - - - - - -

Used to carry handrails along walls or fix structures back to walls. Tube passes through in long lengths, can be joined using the A8 or A9. Can be slid down a post and used for connecting a kick plate. Also for fixing hoardings, signs etc.


 A36  
Tube Ø A B C D E F
5 56 39 10 - - -
6 66 39 10 - - -
7 75 45 10 - - -
8 75 45 10 - - -
9 100 50 10 - - -

This is a part component of the A44. It can be used on it's own for the insertion of signs and hoardings within a tubular frame, the connection of chain and 'D' shackles and tensioning of yachting wire balustrades etc.


 A38  
Tube Ø A B C D E F
5 112 38 10 - - -
6 123 43 10 - - -
7 134 47 10 - - -
8 142 51 10 - - -
9 160 56 10 - - -

Similar to the A36 but with two eyelets. This is a part component of the A46.


 A40  
Tube Ø A B C D E F
5 38 10 - - - -
6 46 10 - - - -
7 48 10 - - - -
8 54 10 - - - -
9 - - - - - -

Similar to the A38 but the two eyelets are at 90°. This is a part component of the A48.


 A42  
Tube Ø A B C D E F
5 61 25 10 12 - -
6 61 25 10 12 - -
7 70 25 10 12 - -
8 77 25 10 12 - -
9 94 36 10 12 - -

Not generally used on their own. They are a part component of the A44, A46, A48 & A52.


 A44  
Tube Ø A B C D E F
5 34 25 56 - - -
6 36 25 66 - - -
7 45 25 75 - - -
8 53 25 75 - - -
9 58 36 100 - - -

A flexible variable angle connector. Used for an angled top rail connection to a post. Use if the angle required is not known. Also used as bracing struts for racking etc. Reducing combinations are available throughout the size range.


 A46  
Tube Ø A B C D E F
5 38 25 36 - - -
6 43 25 36 - - -
7 47 25 45 - - -
8 51 25 53 - - -
9 56 36 58 - - -

A flexile variable connection used for an angled lower rail(s) joint to a post. Changes horizontal rails to angled rails at top of ramp/stairs. Also as bracing struts for racking. Reducing combinations available throughout the size range.


 A48  
Tube Ø A B C D E F
5 25 61 99 - - -
6 25 61 107 - - -
7 25 70 118 - - -
8 25 78 132 - - -
9 - - - - - -

A 90° flexible variable angled connector for posts on a corner. Changes horizontal rails to angled rails, at the top of a ramp/stairs. Use as bracing struts for racking etc. Reducing combinations available throughout the size range.


 A50  
Tube Ø A B C D E F
5 40 84 116 54 12 48
6 40 84 116 54 12 48
7 40 84 116 54 12 48
8 40 84 116 54 12 48
9 40 84 116 54 12 48

A part component of the A52. Used on it's own it is ideal for a wall fixing for a chain attachment with a 'D' shackle. Can be used to take steel straining wires etc. Can be fixed to floor to provide fixing point for mesh panels/kick plates.


 A52  
Tube Ø A B C D E F
5 40 34 25 10 - -
6 40 36 25 10 - -
7 40 45 25 10 - -
8 40 53 25 101 - -
9 40 58 36 10 - -

Used for an angled wall fixing plate or a strut for added strengthening of a post. Not to be used as an angled base plate. Consider the G12. Alternatively use A12 and bend the vertical tube to the upright position.


 A58  
Tube Ø A B C D E F
5 22 - - - - -
6 25 - - - - -
7 25 - - - - -
8 25 - - - - -
9 - - - - - -

Used for the added support of a clamp that may be subject to severe loading, in excess of the maximum permitted slip load of it's socket set screws, on racking etc. Can support another clamp, which doesn't have it's socket screw tightened.


 A60  
Tube Ø A B C D E F
5 30 12 25 - - -
6 33 12 27 - - -
7 37 13 27 - - -
8 40 13 27 - - -
9 - - - - - -

Used in conjunction with the A62 for a gate hinge assembly.


 A62  
Tube Ø A B C D E F
5 25 34 11 30 - -
6 27 34 11 33 - -
7 27 38 12 37 - -
8 27 38 12 40 - -
9 - - - - - -

Used in conjunction with the A60 for a gate hinge assembly.


 A64  
Tube Ø A B C D E F
5 25 32 99 - - -
6 25 34 107 - - -
7 25 39 118 - - -
8 25 41 132 - - -
9 - - - - - -

This clamp is generally used on a vertical post where chain is connected for an access opening in a guardrail. The chain is easily removed from the A64, use an A36 and a 'D' shackle for the opposite end connection.


 A66  
Tube Ø A B C D E F
5x5 35 27 27 27 - -
6x6 42 34 34 34 - -
7x6 50 38 42 34 - -
7x7 50 42 42 42 - -
8x6 56 41 48 34 - -
8x7 56 45 48 42 - -
8x8 56 48 48 48 - -

This clamp can be added to an existing structure. It provides a 90° crossover connection and is an alternative to the A28 but is available in more reducing size variations. It is of mild steel manufacture.


 A67  
Tube Ø A B C D E F
5 - - - - - -
6 143 83 24 28 - -
7 153 105 22 26 - -
8 168 112 22 26 - -
9 - - - - - -

Used on asphalt roofs to provide a rain shield. Slides down the post over the A12 base flange. Once installed a silicone seal should be made between the tube circumference and the top of the cowling. Made from spun steel.


 A70 & A72  
Tube Ø A B C D E F
5 68 58 68 58 - -
6 71 61 71 61 - -
7 75 65 75 65 - -
8 78 68 78 68 - -
9 76 66 76 66 - -

Used to retain mesh panels within a guardrail. Used without the 'horseshoe' end they can secure other types of infill with a max. thickness of 10mm, such as perspex/plywood. Can be added to an existing structure. Space 450mm apart.


 G2  
Tube Ø A B C D E F
5 - - - - - -
6 - - - - - -
7 - - - - - -
8 68 64 - - - -
9 - - - - - -

Used for the joint between the end post and the lower rail(s). Also can be used for the top 'T' joint. Tube cannot be joined in the top part of the 'T' use the G4 when this is required.


 G4  
Tube Ø A B C D E F
5 - - - - - -
6 - - - - - -
7 - - - - - -
8 114 76 - - - -
9 - - - - - -

Used for the joint between the top rail and vertical post. Allows tubes to be joined in the top part of the 'T'. Use the G22 to compliment this for the lower rail(s).


 G6  
Tube Ø A B C D E F
5 - - - - - -
6 - - - - - -
7 - - - - - -
8 68 - - - - -
9 - - - - - -

Used for the termination of the top rail to the vertical post at the starting point of the incline.


 G12  
Tube Ø A B C D E F
5 - - - - - -
6 - - - - - -
7 - - - - - -
8 152 112 92 88 14 10
9 - - - - - -

Provides a structural base plate for the vertical post. Due to the design this base plate can only be fixed down with the fixing holes in line with the applied load (i.e.90° to the rails.)


 G22  
Tube Ø A B C D E F
5 - - - - - -
6 - - - - - -
7 - - - - - -
8 144 - - - - -
9 - - - - - -

Used for the connection of lower rail(s) to an intermediate vertical post, the vertical post must remain continuous while the rails are joined in each side of the clamp. Complimented with the G4 for the top rail connection.




Tube Sizes

Tube Diameter
(mm)

Tube Diameter
(inches)

Nominal Bore
(mm)

Nominal Bore
(inches)

Tube Ø 5
Tube Ø 6
Tube Ø 7
Tube Ø 8
Tube Ø 9

26.9
33.7
42.4
48.3
60.3

1 1/16
1 11/32
1 11/16
1 29/32
2 3/8

20
25
32
40
50

3/4
1
1 1/4
1 1/2
2


Alvin Key Clamps are suitable for pedestrian guardrails, security gates, car park and trolley barriers, storage racking and climbing frames.

Alvin Key Clamps offer a wide variety of rigid, modular structures using standard fittings from the range.

They are easily and quickly assembled without the need of special skills or tools. Alvin Key Clamps eliminate the need for welding, bending or threading of tube.

Alvin Key Clamps are malleable iron castings manufactured in excess of BS 6681 (ISO 5922) and BS 2789 (ISO 1083), all Alvin Clamps are supplied complete with Deltatone coated case hardened screws and are galvanised to BS 729 (ISO 1461).


When tightened to 4.1kg (29ft/lb) a slip load of 900kg can be obtained on each screw.

 

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