Related To Thread

Thread repair is profitable with

Why do threads get damaged?  Overload due to high screw tightening torque „Tight is followed by loose“

Poor thread

 Drilling of broken thread bolts  Corrosion of the thread  Abrasion of frequently used threads

Flange with broken screw

 Spark plug threads  Oil drain threads

Repaired thread with HELICOIL® plus

Repair options for threads Screw M6

 Thread bushes Thread nut M6 inside M10 outside

 More space required  Mechanical or chemical screw locking is needed  Cutting a larger thread for a screw of larger size

DA=10

 More space required  Original screw cannot be used  Characteristics of screwed fastening altered

Screw M6

 HELICOIL® plus thread inserts in stainless steel (A2)  Permanent high strength and high wear resistant fastenings

HELICOIL® plus M6x9

 The original component is conserved  Easy installation

DA=7,3 HELICOIL plus M6x9

The principle of thread repair with HELICOIL® plus HELICOIL® plus M6x9

 Drilling of the damaged thread with the approximate nominal thread diameter d Example: Thread diameter D = M6  Drilling D1HC = 6,22 ...6,41 mm

Screw M6

 Drilling D1HC corresponds to the core hole for HELICOIL® mounting thread  Thread cutting with profile according to nominal thread (identical thread pitch p) and larger outer diameter DHC Example: M6  DHC = 7,3 mm

Table of measurements

DA = 7,3

Setting process of HELICOIL® plus 1. Core hole drilling for HELICOIL® mounting thread diameter according to the technical specification Drilling diameter D1HC (see table of measurements) Drill the core hole

2. Cutting of mounting thread for HELICOIL® plus Use of HELICOIL® plus taps

Cut the thread

3. HELICOIL® plus assembly with HELICOIL® plus installation mandrel A pre-stressing cartridge is essential for precision threads > M16 x 1,5

Assembly of HELICOIL® plus

Setting process of HELICOIL® plus 4. Breaking of the tang with the tang break-off tool

Tang breaking

5. New thread with HELICOIL® plus thread insert Advantages of thread repair with HELICOIL® plus:  High-strength threads  Wear and temperature resistant  Easy installation  HELICOIL® plus – The original!

The thread repair with HELICOIL® plus is even better than the original thread!

HELICOIL® plus product range (metrical) HELICOIL® plus repair kits incl. setting tools  M2 to M16 x 1,5: thread inserts in 3 lengths per dimension  M18 to M36 x 1,5: thread inserts in 1 length per dimension  Special applications (oil drain, spark plug, lambda probe threads)  HELICOIL® plus TWINSERT

HELICOIL® plus repair kits and repair range kits

HELICOIL® plus repair range kits incl. setting tools with thread inserts in various dimensions and lengths M2,5 - M6; M4 - M10; M5 - M12; M6 - M14 x 1,5 and Special applications (oil drain and spark plug threads) HELICOIL® plus refill packs

HELICOIL® plus refill pack

Repair solutions for special applications HELICOIL® plus repair kits for damaged oil drain threads  HELICOIL® plus thread inserts M12 x 1,5; M14 x 1,5 and M16 x 1,5 each in 3 lengths  Combined drilling and tapping tool  Hand tap (in case of interferences)  Installation mandrel, tang break-off tool, slide gauge HELICOIL® plus repair range kits for damaged oil drain threads  HELICOIL® plus thread inserts M12 x 1,5 to M16 x 1,5 each in 3 lengths  Combined drilling and tapping tool  Hand tap (in case of interferences)  Installation mandrel, tang break-off tool, slide gauge

Repair solutions for special applications Steps of installation of HELICOIL® plus thread inserts for damaged oil drain threads

1. Determine nominal thread diameter.

2. HELICOIL® plus screw taping. The combined drilling and tapping tool allows tapping at right angles with the sealing surface as in new condition.

3. Determination of the required coils with a slide gauge.

4. Selection of the right HELICOIL® plus thread insert on basis of the table of measurements.

Repair solutions for special applications Steps of the installation of HELICOIL® plus thread inserts for damaged oil drain threads

5. Assembling of HELICOIL® plus

6. Break tang with the tang break-off tool

7. New efficient thread with HELICOIL® plus

8. An adequate sealing ring support is available for standard plugs with collar.

Repair solutions for special applications HELICOIL® plus repair kits for damaged lambda probe threads  HELICOIL® plus thread inserts with dimension M18 x 1,5 x 9 resistant to high temperatures in Inconel X750, silver-plated  Hand tap, material HSS  Manual tap

Repair solutions for special applications HELICOIL® plus repair kit for damaged spark plug threads  HELICOIL® plus thread inserts in various dimensions  Combined drilling and tapping tool  Installation mandrel

HELICOIL® plus repair range kit for damaged spark plug threads M10 x 1, M12 x 1,25 and M14 x 1,25  HELICOIL® plus thread inserts in various dimensions and lengths  Combined drilling and tapping tools  Installation mandrels  Tang break-off tool

Spark plug

Repair solutions for special applications Steps of the installation of HELICOIL® plus thread inserts for damaged spark plug threads

1. HELICOIL® plus tap drill

2. Spin on thread insert

3. HELICOIL® plus installation

4. Break tang with tang break-off tool

Repair with HELICOIL® plus TWINSERT HELICOIL® plus TWINSERT consists of 2 HELICOIL® plus inserts

Application:  Repair of extensively damaged tapped holes  Repair of off-centre or oversized tapped threaded holes  HELICOIL® plus TWINSERT is also a solution if the design does not allow a larger bolt diameter

HELICOIL® plus

Start HELICOIL® plus TWINSERT

HELICOIL® plus

HELICOIL® plus TWINSERT

HELICOIL® plus product range (imperial) HELICOIL® plus repair kits incl. manual taps UNC 2-56

to

UNC 1 ½“-6

 American national coarse threads

UNF 4-48

to

UNF 1“-12

 American national fine threads

BSW 3/16“-24

to

BSW 1 ½“-6

 British standard coarse threads

BSF 1/4“-26 to

BSF 1“-10

 British standard fine threads

G 1/8“-28

G 1“-11

 British standard pipe threads G = DIN ISO 228/1

to

HELICOIL® plus repair range kits incl. manual taps Thread inserts in various dimensions and lengths: UNC UNF BSW

HELICOIL® plus product range of imperial repair kits BSW

UNC

UNC 2-56 to UNC ½“-13

UNC 9/16“-12 to UNC 1 ½“-6

BSF

UNF

UNF 4-48 to UNF ½“-20

BSW 3/16“-24 to BSW 1½“-6

UNF 9/16“-18 to UNF 1“-12

BSF 1/4“-26 to BSW 1“-1

G

G1/8“-28 to G1“-11

Thread repair with HELICOIL® plus Dimensions of the HELICOIL® plus mounting threads Thread diameter

Pitch

Rec. twist drill Ø

Depth of core hole

Nominal length of insert

Spark plug threads * No drilling of a core hole, combined drilling and tapping tool to be used Measurements for other metric and imperial dimensions => see catalogue

Back to installation of HELICOIL® plus

Outside Ø DHC min.

Thread repair with HELICOIL® plus Installation data of HELICOIL® plus

Notch

Tang

D

thread diameter

P

pitch

DHC outer thread of tapped hole B

recommended twist drill diameter

t1

minimal depth of the core hole

t2

nominal length of thread insert and minimum length of holding thread

t3

maximum screw-in depth, if tang has not been broken off

Tang not broken

Back to installation of HELICOIL® plus