Trailer Suspension U Bolt Selection

How to select the correct suspension mounts

Trailer suspension is the most important component on your trailer. Making sure you get the correct spring fittings is important to the safety of your trailer. To complete the total spring kit selection, you need to identify the U bolt kit that is appropriate. U bolt kits contain the U bolts, nuts & washers, axle pads and fish plates.

Each U Bolt Kit contains components for ONE axle only. When ordering trailer suspension components for a multi axle application, order the number of kits to correspond with the number of axles.

To select your U bolt kit:

Identify what width of spring you are using: 45mm or 60mm.
Identify the number of spring leaves, i.e. 2,3,7,etc.
Identify the section of the axle, i.e. 39mm round, 50mm square etc.

Simply read across the tables to find the appropriate part number for the U bolt kit you require.

45MM SPRING WIDTH	AXLE SIZE
	39MM R	40MM SQ	45MM R	45MM SQ	60MM TUBE	50MM R	50MM SQ
1 LEAF	597000
2 LEAF	597000
3 LEAF	597000	597005	597010
4 LEAF		597005	597010
5 LEAF		597005	597015	597020	597030
6 LEAF			597015	597020	597030	590727	597035
7 LEAF				597025	597030		597040
8 LEAF				597025	597030		597040
9 LEAF							597040

60MM SPRING WIDTH	AXLE SIZE
	40MM SQ	45MM R	45MM SQ	50MMR	50MM SQ	56MM R	60MMR	65MM SQ
4 LEAF X 6mm	597065	597070	597080
5 LEAF X 6mm		597075	597095	597135
6 LEAF X 6mm			597095	597135	597105
7 LEAF X 6mm			597095		597105
8 LEAF X 6mm					597105	597130
”Outback” 5 leaf		597116	597115	597137	597126
”Outback” 6 leaf				597137	597126
”Outback” 7 leaf					597120
”Outback” 8 leaf					597120
”Outback” 9 leaf					597125
”Outback” 10 leaf					597127			597106
ROCKER ROLLER 5 LEAF			597115		597124
ROCKER ROLLER 6 LEAF			597115		597124
ROCKER ROLLER 7 LEAF					597125	597130	597140
ROCKER ROLLER 8 LEAF					597125	597130	597140

U-bolts

ubolts

PART NO	AXLE SECTION “B”	U BOLT LENGTH “L”	NOMINAL THREAD LENGTH “A”	THREAD TYPE “T”	FINISH
591145	39mm Round	115mm / 4 1/2”	50mm	1/2” BSW	Black
591150	39mm Round	127mm / 5”	50mm	1/2” BSW	Black
591345	45mm Round	115mm / 4 1/2”	50mm	1/2” BSW	Black
591350	45mm Round	127mm / 5”	50mm	1/2” BSW	Black
591355	45mm Round	140mm / 5 1/2”	50mm	1/2” BSW	Black
591555	50mm Round	140mm / 5 1/2”	50mm	1/2” BSW	Black
592515	50mm Round	145mm / 5”	50mm	5/8” BSW	Black
591565	50mm Round	165mm / 6 1/2”	50mm	1/2” BSW	Black
591566	56mm Round	153mm / 6”	50mm	1/2” BSW	Black
591245	40mm Square	115mm / 4 1/2”	50mm	1/2” BSW	Black
591250	40mm Square	127mm / 5”	50mm	1/2” BSW	Black
591255	40mm Square	140mm / 5 1/2”	50mm	1/2” BSW	Black
591445	45mm Square	115mm / 4 1/2”	50mm	1/2” BSW	Black
591450	45mm Square	127mm / 5”	50mm	1/2” BSW	Black
591455	45mm Square	140mm / 5 1/2”	50mm	1/2” BSW	Black
591455G	45mm Square	145mm/ 5 3/4”	50mm	1/2” BSW	Galv
591460	45mm Square	150mm / 6”	50mm	1/2” BSW	Black
591465	45mm Square	165mm / 6 1/2”	50mm	1/2” BSW	Black
592455	45mm Square	160mm / 6 1/4”	50mm	5/8” BSW	Black
592455G	45mm Square	160mm / 6 1/4”	50mm	5/8” BSW	Galv
591645	50mm Square	115mm / 4 1/2”	50mm	1/2” BSW	Black
591645G	50mm Square	115mm / 4 1/2”	50mm	1/2” BSW	Galv
591655	50mm Square	140mm / 5 1/2”	50mm	1/2” BSW	Black
591655G	50mm Square	140mm / 5 1/2”	50mm	1/2” BSW	Galv
592505	50mm Square	150mm / 6”	50mm	5/8” BSW	Black
591660	50mm Square	153mm / 6”	50mm	1/2” BSW	Black
591660G	50mm Square	153mm / 6”	50mm	1/2” BSW	Galv
591665	50mm Square	165mm / 6 1/2”	50mm	1/2” BSW	Black
591665G	50mm Square	165mm / 6 1/2”	50mm	1/2” BSW	Galv
592465	45mm Round	145mm / 5 3/4”	50mm	5/8” BSW	Black
592506	50mm Square	165mm / 6 1/2”	50mm	5/8” BSW	Black
592506G	50mm Square	165mm / 6 1/2”	50mm	5/8” BSW	Galv
592507	50mm Square	180mm / 7”	50mm	5/8” BSW	Black
592566	56mm Round	165mm / 6 1/2”	50mm	5/8” BSW	Black
592666	60mm Round	165mm / 6 1/2”	50mm	5/8” BSW	Black
592666G	60mm Round	165mm / 6 1/2”	50mm	5/8” BSW	Galv
590108	60.3mm Round Tube	153mm / 6”	50mm	1/2” BSW	Black
592575	50mm Round	145mm / 5 3/4”	50mm	5/8” BSW	Black
592630	63mm Square	180mm / 7”	63mm	5/8” BSW	Black

U Bolt Nuts & Washers

PART NO	DESCRIPTION
590119	Nut 1/2” BSW Nyloc 2P
590120	Nut 5/8” BSW Nyloc 2P
190053	1/2” Flat Washer 2P
190057	5/8” Flat Washer 2P
590117	Washer 5/8” spring x 1/8 sq
590122	Nut Hex 5/8” BSW Galvanised
590123	Washer M12 Galvanised
590124	Washer M16 Galvanised

Spring Bushes

bushes

PART NO	DESCRIPTION	ID	OD	L
590001	Spring nylon bush	1/2”	7/8”	45mm
590002	Spring nylon bush	9/16”	7/8”	45mm
590003	Spring nylon bush	5/8”	7/8”	60mm
590004	Spring nylon bush	9/16”	3/4”	45mm
590005	Spring nylon bush	5/8”	7/8”	45mm

Fish Plates

fish-plates

PART NO	DESCRIPTION	SURFACE FINISH	A	B	T	S	R
590401	Fish Plate	Black	45	45	8
591410	Fish Plate	Black	40	60	8
590413	Fish Plate	Black	40	45	8
590414	Fish Plate	Zinc Plated	45	60	10
590414G	Fish Plate	Galvanised	45	60	10
590417	Fish Plate	Black	50	60	8
590415	Fish Plate Slotted	Black	39	45	10	14	7
590415G	Fish Plate Slotted	Galvanised	39	45	10	14	7
590420	Fish Plate Slotted	Black	60	45	10	2.5	8.5
590420G	Fish Plate Slotted	Galvanised	60	45	10	2.5	8.5
590456	Fish Plate Slotted	Black	60	55	10	2.5	8.5
590456G	Fish Plate Slotted	Galvanised	60	55	10	2.5	8.5
590465	Fish Plate	Black	60	65	10		8.5

Spring Hangers – Single Axle

spring_hangers

PART NO	DESCRIPTION	W	D
590444	Rear Parabolic Hanger 45mm spring	45
590443	Deep Front Slipper Hanger 45mm spring 1/2” bolt	45	1/2”
590442	Shallow Front Slipper Hanger 45mm spring 1/2” bolt	45	1/2”
590445	Rear Slipper Hanger 45mm spring	45
590446	Front Slipper Hanger 60mm spring 5/8” bolt	60	5/8”
590447	Rear Slipper Hanger 60mm spring	60
590450	Rear Slipper Hanger on strap 60mm spring	60
590451	Front Slipper Hanger on strap 60mm spring 5/8” bolt	60	5/8”
590600	Front Hanger 45mm spring 9/16” bolt	45	9/16”
590630	Front Hanger 60mm ”outback”	60	M16
590631	Rear Hanger Dumbjack ”outback” 60mm spring	60	M16
590604	Rear Hanger Dumbjack 45mm spring	45	5/8”

Eye To Eye Spring Shackle Plates – single & tandem

spring_shackle_plates

PART NO	DESCRIPTION	D	L
590606	Shackle plate suit 45mm wide spring	9/16”	75mm
590607	Shackle plate suit 45mm wide spring	9/16”	50mm
590713	Shackle plate suit 60mm wide tandem rocker and outback spring	M16	64mm

Eye To Eye Spring Shackle Pins & Nuts

spring_shackle_pins

Part No	Description	D	L
590113	Shackle Bolt Non-Greasable	1/2”	3 1/2”
590608	Shackle Pin 9/16” x 3 1/2” solid with 9/16” nyloc nut	9/16”	3 1/2”
590609	Shackle Pin Greasable	9/16”	3 1/2”
590610	Shackle Pin Greasable	5/8”	3 1/4”
590611	Shackle Pin Non-Greasable	5/8”	3 1/2”
590125	Shackle Bolt Non-Greasable	5/8”	4”
590632	Shackle Pin ”Outback” M16 x 100mm with grease nipple	16mm	100mm
590707	Shackle Pin M16 x 100mm Non-Greasable suit Tandem 60mm rocker springs	16mm	100mm
590711	Centre Rocker Pin M18 x 100mm Greasable suit Tandem 60mm rocker springs	18mm	100mm
590119	Shackle Bolt Nyloc Nut 1/2” BSW
590614	Shackle Pin Nyloc Nut 5/8” UNF
590615	Shackle Pin Nyloc Nut 9/16” UNF
590708	Shackle Pin Nyloc Nut M16
590712	Centre Rocker Pin Nyloc Nut M18
590620	Grease nipple 1/8” BSP
576307	Shackle Pin M16 with 45 degree nipple suit roller end on Rocker Roller spring

Spring Pad / Axle Pad

spring_pad

Part No.	Description	Surface Finish	L	W	T
590510	Spring Pad to suit round and square	Black	47mm	40mm	8mm
590516	Spring Pad to suit round and square	Black	47mm	40mm	10mm
590510G	Spring Pad to suit round and square	Galvanised	47mm	40mm	8mm
590513	Spring Pad to suit 65mm round axle/63m square axle	Black	60mm	65mm	10mm
590515	Spring Pad for 60mm tube axle	Zinc Plated	See diagram

Tandem Spring Hangers

tandem_spring_hangers

PART NO	DESCRIPTION
590601	Centre hanger suit 45mm shackle pins
590703	Centre Hanger suit 60mm Tandem Rocker Springs – 18mm pin
576305	Centre Hanger suit 60mm Tandem Rocker Roller Springs – 18mm pin
576302	Front or Rear Hanger Tandem Rocker Roller Springs
590701	Front or Rear Hanger Tandem Rocker Springs
576301	Roller only – Spare Part

Tandem Rocker Spring Rockers

tandem_rocker_spring_rockers

PART NO	DESCRIPTION
590616	Rocker assembly suit 45mm shackle spring suit 5/8” pin
590705	Rocker assembly suit 60mm shackle spring 18mm pin 202mm centres
576303	Rocker assembly suit Rocker Roller springs