Threading Inserts

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I'd like to repair a 3/8-16 threaded hole in cast iron. Best method? Or should I use a threaded insert? How?

Do you need a special tap for cast iron? A special drill? What could I use to adhere a piece of steel inside the bad hole and redrill and tap the steel? If that's possible, I would drill existing hole a little bigger for the steel. Can any of this be done?
By the way, the hole is only about 1/4" deep and open at the bottom - in other words, it's a through-hole. To my knowledge, there are no 1/4 inch long 3/8-16 Helicoils. Can't cut it, right. A threaded insert might work if I can cut one to 1/4" and tight-fit it in? Could it be "glued" in place? (The bolt that goes into the hole is just to tighten a clamp in place, no real great pull tension.
After reading some of the answers, I must tell you that the bolt is a specialized bolt that must remain 3/8-16 thread. This fixture is on an old wood jointer, and the bolt configuration is made to tighten down on the piece that is stripped, to lock the jointer fence in position.

I think your best bet is to drill and tap for a solid insert and use the best grade thread locker (such as loctite). Helicoil is problematic as it isn't designed for this type of application.

Discover Threading Inserts On eBay Below:

9 TOOLFLO FLA 4R MOD GP50 D1 TOP NOTCH CARBIDE THREADING INSERT TF 6360N4
9 TOOLFLO FLA 4R MOD GP50 D1 TOP NOTCH CARBIDE THREADING INSERT TF 6360N4
$75.00
7 Pc 5 8 Indexable Internal Right Hand Threading Tool Holder Inserts Set New
7 Pc 5 8 Indexable Internal Right Hand Threading Tool Holder Inserts Set New
$88.95
10pc ToolFlo FLTF 3R GP3R Top Notch Carbide 60 Fine V Threading Inserts NTF 3R
10pc ToolFlo FLTF 3R GP3R Top Notch Carbide 60 Fine V Threading Inserts NTF 3R
$138.00
10pc ToolFlo FLTF 3R C25 Top Notch Carbide 60 Fine V Threading Inserts NTF 3R
10pc ToolFlo FLTF 3R C25 Top Notch Carbide 60 Fine V Threading Inserts NTF 3R
$133.00
SANDVIK R166G 3AL 140 CARBIDE THREADING INSERTS 8 PCS
SANDVIK R166G 3AL 140 CARBIDE THREADING INSERTS 8 PCS
$18.00
SANDVIK R166G 3CL 080 CARBIDE THREADING INSERTS 10 PCS
SANDVIK R166G 3CL 080 CARBIDE THREADING INSERTS 10 PCS
$22.50
10pc ToolFlo FLTK 3L AC50C Top Notch Carbide 60 V Threading Inserts NTK 3L
10pc ToolFlo FLTK 3L AC50C Top Notch Carbide 60 V Threading Inserts NTK 3L
$148.00
LACH PCD Tipped Carbide Threading Insert D TNMA 54 EXT USA
LACH PCD Tipped Carbide Threading Insert D TNMA 54 EXT USA
$36.67
LACH PCD Tipped Carbide Threading Insert D TNMA 54 INT USA
LACH PCD Tipped Carbide Threading Insert D TNMA 54 INT USA
$36.67
10pc ToolFlo FLTK 3L GP50C Top Notch Carbide 60 V Threading Inserts NTK 3L
10pc ToolFlo FLTK 3L GP50C Top Notch Carbide 60 V Threading Inserts NTK 3L
$138.00
11ER A60 11ERA60 Metric Insert For SER SNL Internal Threading Tool Holder
11ER A60 11ERA60 Metric Insert For SER SNL Internal Threading Tool Holder
$15.29
1 1 4 12 SET Quality Thread Cutting Insert Chasers Die Head Threading Tools
1 1 4 12 SET Quality Thread Cutting Insert Chasers Die Head Threading Tools
$21.15
10pc ToolFlo FLTK 3R AC50C Top Notch Carbide 60 V Threading Inserts NTK 3R
10pc ToolFlo FLTK 3R AC50C Top Notch Carbide 60 V Threading Inserts NTK 3R
$148.00
10pc ToolFlo FLTK 3R GP50C Top Notch Carbide 60 V Threading Inserts NTK 3R
10pc ToolFlo FLTK 3R GP50C Top Notch Carbide 60 V Threading Inserts NTK 3R
$138.00
10pc ToolFlo FLTK 3R GP3R Top Notch Carbide 60 V Threading Inserts NTK 3R
10pc ToolFlo FLTK 3R GP3R Top Notch Carbide 60 V Threading Inserts NTK 3R
$138.00
7 Pc 3 8 Indexable External Right Hand Threading Tool Holder Inserts Set New
7 Pc 3 8 Indexable External Right Hand Threading Tool Holder Inserts Set New
$83.60
LOT SUMITOMO ELECTRIC TME TMI 1020R CARBIDE THREADING INSERT 8PCS
LOT SUMITOMO ELECTRIC TME TMI 1020R CARBIDE THREADING INSERT 8PCS
$14.99
Seco 16NR 8ACME CP500 PVD Coating Solid Carbide Threading Inserts 64736 QTY 2
Seco 16NR 8ACME CP500 PVD Coating Solid Carbide Threading Inserts 64736 QTY 2
$13.99
RT1601N 300GM RIGHT HAND INTERNAL THREADING  GROOVING INSERT 6006 1011
RT1601N 300GM RIGHT HAND INTERNAL THREADING GROOVING INSERT 6006 1011
$13.14
10pcs 16ER15 ISO SMX30 Carbide Threading Insert
10pcs 16ER15 ISO SMX30 Carbide Threading Insert
$18.95
Seco 22ER N60 CP500 PVD Coating Solid Carbide Threading Inserts 68403 QTY 2
Seco 22ER N60 CP500 PVD Coating Solid Carbide Threading Inserts 68403 QTY 2
$14.99
60 NEW NAS1130 08 15D Mil Spec 8 32 x 02 Dia Helical Tangless Threaded Inserts
60 NEW NAS1130 08 15D Mil Spec 8 32 x 02 Dia Helical Tangless Threaded Inserts
$35.95
5pcs 16ERAG60 05mm 30mm 16ER 3 8 AG60 Insert For Threading Turning Tool
5pcs 16ERAG60 05mm 30mm 16ER 3 8 AG60 Insert For Threading Turning Tool
$8.69
Seco 16ER 18UNJ CP500 PVD Coating Solid Carbide Threading Inserts 49868 QTY 2
Seco 16ER 18UNJ CP500 PVD Coating Solid Carbide Threading Inserts 49868 QTY 2
$9.99
10pcs 11 IR1 4 A60 11IRA60 Metric Insert For SIR SNR Internal Threading Tool
10pcs 11 IR1 4 A60 11IRA60 Metric Insert For SIR SNR Internal Threading Tool
$14.85
22IRN60 TiN COATED INTERNAL THREADING CARBIDE INSERT 6007 0018
22IRN60 TiN COATED INTERNAL THREADING CARBIDE INSERT 6007 0018
$13.50
Kerb Konus Ensat S UNF 3 8 24 Self Tapping Threaded Inserts SS Qty 1500
Kerb Konus Ensat S UNF 3 8 24 Self Tapping Threaded Inserts SS Qty 1500
$374.99
2 Pcs SECO 39619 40030N20ISO Grade F30M Carbide Internal Threading Inserts
2 Pcs SECO 39619 40030N20ISO Grade F30M Carbide Internal Threading Inserts
$99.00
10pcs Cassar 22ER N60 Carbide Threading Insert For Turning Tool Boring BAR
10pcs Cassar 22ER N60 Carbide Threading Insert For Turning Tool Boring BAR
$43.89
SANDVIK Coromant R166L 3AL 160 S1OT P10 Threading Lathe Carbide 10 Inserts New
SANDVIK Coromant R166L 3AL 160 S1OT P10 Threading Lathe Carbide 10 Inserts New
$45.95
5pcs 16IRAG60 05 30mm 16IR3 8 AG60 Carbide Insert For Threading Turning Tool
5pcs 16IRAG60 05 30mm 16IR3 8 AG60 Carbide Insert For Threading Turning Tool
$7.59
STS SCANDINAVIAN TOOL 40XTM 8NPT New Carbide Threading Inserts Grade K20C 5pcs O
STS SCANDINAVIAN TOOL 40XTM 8NPT New Carbide Threading Inserts Grade K20C 5pcs O
$99.95
SECO 26NR K60 CP500  Carbide Laydown Threading Insert  57520  2 PCS
SECO 26NR K60 CP500 Carbide Laydown Threading Insert 57520 2 PCS
$49.00
Drillpro 10pcs 11IR A60 Carbide Insert Internal Threading Insert For Turning
Drillpro 10pcs 11IR A60 Carbide Insert Internal Threading Insert For Turning
$15.04
Drillpro SER1010H11 Threading Turning Tool Holder with 11ER A60 Carbide Insert
Drillpro SER1010H11 Threading Turning Tool Holder with 11ER A60 Carbide Insert
$11.34
10pcs 11IR1 4 A60 Metric Insert For SIR SNR Internal Threading Tool Holder
10pcs 11IR1 4 A60 Metric Insert For SIR SNR Internal Threading Tool Holder
$15.72
7 Pc 3 4 Indexable Internal Right Hand Threading Tool Holder Inserts Set New
7 Pc 3 4 Indexable Internal Right Hand Threading Tool Holder Inserts Set New
$95.95
SANDVIK Coromant L166 0G 16MM01 200 1020 60 ISO 20 10 Carbide Inserts Threading
SANDVIK Coromant L166 0G 16MM01 200 1020 60 ISO 20 10 Carbide Inserts Threading
$64.90
SANDVIK Coromant L166 0G 16MM01 200 1020 60 ISO 20 4 Carbide Inserts Threading
SANDVIK Coromant L166 0G 16MM01 200 1020 60 ISO 20 4 Carbide Inserts Threading
$26.90

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