Sae Thread Repair
Need a “M12×1.25″ Standard Equivalent!?
Urgent,
While repairing my car, discovered previous owner cross threaded a critical bolt on the flywheel,
nonetheless:
The bolt that was improperly impacted was a m12×1.25.
Both the bolt and 1/2 of the hole was stripped, looking just to get a bolt in there for the second half of the threads still intact. The metric bolt is no where to be found.
Looked around locally and can’t find a bolt with an appropriate strenth for its application. So i’m stepping to SAE. What would the standard equivalent be for this bolt?
Surely you could find a Metric bolt at a wrecker??
There’s no direct equivalent. In SAE, 1/2″ would be a little bigger in diameter, and for the pitch use UNF, 20 TPI is very close to 1.25 pitch.
Drill 29/64″ if necessary, but try to at least start tapping using the bit of thread left at the top of the hole, if the tap starts differently you could end up cutting out the thread at the base of the hole.You need to be able to pick this up as near as possible.
The diameter difference is about .027″ between the M12 and 1/2″. Thus the UNF thread will still be very shallow at the stripped end, you will be relying on picking up the “good” section near the bottom.
Another possibility would be a Helicoil, to regain full thread depth.
fixing striped bolt hole
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NEW TIME-SERT SAE Fine UNF Master Thread Repair Kit $415.03 |
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NEW TIME-SERT 10 – 24 SAE Thread Repair Kit Rethread $60.29 |
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NEW TIME-SERT 12 – 24 SAE Thread Repair Kit Rethread $61.69 |
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NEW TIME-SERT 1/4 – 20 SAE Thread Repair Kit Rethread $61.69 |
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NEW TIME-SERT 10 – 32 SAE Thread Repair Kit Rethread $60.29 |
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NEW TIME-SERT 5/16 – 18 SAE Thread Repair Kit Rethread $63.10 |
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NEW TIME-SERT SAE Coarse UNC Master Thread Repair Kit $398.21 |
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TIME-SERT SAE Fine UNF Mini Master Thread Repair Kit $238.36 |
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TIME-SERT SAE Coarse UNC Mini Master Thread Repair Kit $238.36 |
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NEW TIME-SERT 7/16-14 SAE Thread Repair Kit Rethread $84.13 |
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NEW TIME-SERT 7/16-20 SAE Thread Repair Kit UNF $85.53 |
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NEW TIME-SERT 8 – 32 SAE Thread Repair Kit Rethread $63.10 |
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NEW TIME-SERT 3/8-16 SAE Thread Repair Kit Rethread $68.70 |
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5/16-24 Perma-Coil SAE Thread Repair Kit! Uses Helicoil $25.99 |
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5/8 -18 Perma-Coil SAE Thread Repair Kit Uses Helicoil $43.99 |
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3/8-24 Perma-Coil SAE Thread Repair Kit! Uses Helicoil $25.99 |
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3/4 -16 Perma-Coil SAE Thread Repair Kit Uses Helicoil $44.99 |
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7/16 -20 Perma-Coil SAE Thread Repair Kit Uses Helicoil $27.99 |
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1/4-28 Perma-Coil SAE Thread Repair Kit! Uses Helicoil $25.99 |
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5/16-24 Perma-Coil SAE Thread Repair Kit! Uses Helicoil $28.99 |
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1/4-28 Perma-Coil SAE Thread Repair Kit! Uses Helicoil $28.99 |
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3/8-24 Perma-Coil SAE Thread Repair Kit! Uses Helicoil $28.99 |
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7/16 -20 Perma-Coil SAE Thread Repair Kit Uses Helicoil $30.99 |
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5/8 -18 Perma-Coil SAE Thread Repair Kit Uses Helicoil $45.99 |
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3/4 -16 Perma-Coil SAE Thread Repair Kit Uses Helicoil $49.99 |
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Murray Tools Split Die Thread Repair Kit -6Pc SAE Set M $114.99 |
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Murray Tools Split Die Thread Repair Kit -6Pc SAE Set S $99.99 |
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Kastar 972 40 Piece Fractional and Metric Thread Restorer Kit $62.99 Contains:7 National coarse dies, sizes: 1/4″ – 20, 5/16″ – 18, 3/8″ – 16, 7/16″ – 14, 1/2″ – 13, 9/16″ – 12, 5/8″ – 117 National fine dies, sizes: 1/4″ – 28, 5/16″ – 24, 3/8″ – 24, 7/16″ – 20, 1/2″ – 20, 9/16″ – 18, 5/8″ – 186 metric dies, sizes: M6 x 1, M8 x 1.25, M10 x 1.5, M12 x 1.25, M12 x 1.5, M12 x 1.756 National coarse taps, sizes: 1/4″ – 20, 5/16″ – 18, 3/8″ – 16, 7/16″ – 14, 1/2″ – 13, 9/… |
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Nut & Bolt Thread Checker (Metric) $32.99 The Thread Checker, also known as a Thread Verifier, Thread Identifier, and Thread Check Tool is a great addition for any Home, Hobby, or Inventor’s Work Shop, Auto, Motorcycle, Marine, ATV or RV Repair Shop, Heavy Equipment Repair Shop, Military Equipment Repair Station, Machine Shop, Fabricating Shop, Assembly Department, Production Department or Quality Inspection Station! SWTC-M21 Size Spec… |
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KD Tools (KD 2249) SAE File Thread Restorer 8 Sizes $9.81 Restore external threads by filing Overlap several good threads with file and file damaged ones Files right and left hand threads Long lasting, fast cutting teethSAE Thread restorer file – Pitch sizes include the following: 9, 10, 12, 16, 20 ,27 ,28 ,32. Proudly made of the finest components under the most stringent manufacturing guidelines. Made for the everyday use!… |
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Nut & Bolt Thread Checker (Inch & Metric) $29.99 The Thread Checker is an accurate and easy-to-use thread verifier for both nuts and bolts. Conveniently assembled onto a wire loop, it is especially well suited for distinguishing between similar inch and metric threads. This unique tool is a great addition for any Home, Hobby, or Inventor’s Work Shop, Auto, Motorcycle, Marine, ATV or RV Repair Shop, Heavy Equipment Repair Shop, Military Equipme… |
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NEW TIME-SERT 1/2 – 20 SAE Drain Plug Repair Kit for aluminum oil pans $105.87 TIME-SERT is a sophisticated thread repair system that is considered by many to be superior to any other method of repairing stripped or damaged threads. TIME-SERTis a solid bushing insert. This facilitates easy installation and allows for full torque to be applied to repaired threads, ensuring a strong, permanent repair. TIME-SERTis thin walled due to synchronized internal / external threads. Sma… |
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NEW TIME-SERT 3/8-16 SAE Thread Repair Kit # 0381 $66.06 TIME-SERT® Is a sophisticated thread repair system that is considered by many to be superior to any other method of repairing stripped or damaged threads. TIME-SERT® is a solid bushing insert. This facilitates easy installation and allows for full torque to be applied to repaired threads, ensuring a strong, permanent repair. TIME-SERT® is thin walled due to synchronized internal / external thre… |
