(figure 2)
Superior Engineering rods use heavy duty female tie rod ends as opposed to the factory tie rod ends which screw into the bar, the cheaper and smaller male threaded tie rod ends can bend when pushed hard. The heavy duty female ends also use a clamping system to hold them in place rather
than a lock nut.

(figure 1)

All our 4140 Comp Spec rods are CNC machined to ensure accuracy in the thread, and then they are zinc plated to increase resistance to corrosion.

figure 3

When you buy our solid bar drag link you receive everything you need to fit it to your car.
We supply a bolt on steering damper bracket to suit your particular model, we believe if it is a required item it should be included in the price, NOT as an optional extra!

Don’t get bitten by lower quality products on the market
Go with a Superior Comp Spec rod and steer with confidence.

Below we have added some information on the Carbon steel we use at Superior Engineering

4140 High Tensile Steel

4140 is a 1% chromium - molybdenum medium hardenability general purpose high tensile steel - generally supplied hardened and tempered in the tensile range of 850 - 1000 Mpa (condition T).

4140 is now available with improved machinability, which greatly increases feeds and/or speeds, while also extending tool life without adversely affecting mechanical properties.

Pre hardened and tempered 4140 can be further surface hardened by flame or induction hardening and by nitriding.

4140 is used extensively in most industry sectors for a wide range of applications such as:
Adapters, Arbors, Axle Shafts, Bolts, Crankshafts, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts, Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pins Various, Pinions, Pump Shafts, Rams, Sockets, Spindles, Sprockets, Studs, Tool Holders, Torsion Bars, Worms etc..

Colour Code

Dark Blue
(Bar end)

Stocked Sizes

Rounds

10mm to 690 mm Diameter

Hexagons

19 mm to 55 mm A/F

Hollow Bar

63 mm to 250 mm OD

Bar Finish

Peeled, Cold Drawn
Turned and Polished,
Centreless Ground.
or Hot Rolled.

Related Specifications

Australia

AS 1444-1996-4140

Germany

DIN 17212 W.Nr 1.7223 Type 41CrMo4
DIN 17200-1654 W.Nr 1.7225 Type 42CrMo4
DIN 17200 W.Nr 1.7227 Type 42CrMoS4

Great Britain

BS970-1955 EN19A
BS970 Part 3:1991 709M40

International

ISO 683/II Type 3
ISO 683/IV Type 3a
ISO 683/IV Type 3b

Japan

JIS G 4103 SNCM4
JIS G 4105 SCM4
JIS G 4105 SCM440

USA

AISI 4140
ASTM A29/A29M-91 4140
ASTM A322 4140
ASTM A331 4140 (Cold Finish)
SAE 4140

Chemical Composition

Min.%

Max.%

Carbon

0.36

0.44

Silicon

0.10

0.40

Manganese

0.65

1.10

Chromium

0.75

1.20

Molybdenum

0.15

0.35

Phosphorous

0.04

Sulphur

0.04

Mechanical Property Requirements for Steels in the Heat-Treated Condition for Turned, Peeled or Ground Finish to AS1444-1996 4140 and BS970 Part 3-1991 709M40
Mechanical Property Designation	Limited Ruling Section mm	Tensile Strength Mpa		0.2% Proof Stress Mpa	Elongation on 5.65 %	Izod Impact J	Charpy Impact J	Brinell Hardness HB
Mechanical Property Designation	Limited Ruling Section mm	(Min)	(Max)	Min	Min.	Min.	Min.	Min	Max
R	250	700	850	480	15	34	28	201	255
S	250	770	930	540	13	27	22	223	277
S	150	770	930	570	15	54	50	223	277

*T	100	850	1000	665	13	54	50	248	302
U	63	930	1080	740	12	47	42	269	331
V	30	1000	1150	835	12	47	42	293	352

W	20	1080	1230	925	12	40	35	311	375
*Material stocked generally in condition T Check test certificate if critical for end use.
Mechanical Property Requirements for Steels Heat-Treated, and then Cold Finished to AS 1444 - 1996, and BS 970 Part 3 - 1991 709 M40
Mechanical Property Designation	Limited Ruling Section	Tensile Strength Mpa		0.20% Proof Stress Mpa	Elongation on 5.65 %	Brinell Hardness HB
Mechanical Property Designation	Limited Ruling Section	Min	Max	Min	Min	Min	Max
R	63	700	850	525	12	201	255
S	63	770	930	585	11	223	277
T	63	850	1000	680	9	248	302

U	63	930	1080	755	9	269	331
V	63	1000	1150	850	9	293	352
*Material stocked generally in condition T Check test certificate if critical for end use.