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expiredphoinix | Staff posted Mar 06, 2026 07:25 PM
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expiredphoinix | Staff posted Mar 06, 2026 07:25 PM

Century Drill & Tool 1/2-20 NF Right Hand Rethreading Die

$3.20

$7.99

59% off
Amazon
9 Comments 8,020 Views
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Deal Details
Amazon has Century Drill & Tool 1/2-20 NF Fractional Right Hand Rethreading Die (92910) on sale for $3.19. Shipping is free with Prime or on $35+ orders.

Thanks to Deal Hunter phoinix for sharing this deal.

Details:
  • Precision thread repair: Restores and cleans damaged threads on bolts/studs without removing excessive material; salvages hardware quickly and efficiently
  • Protects original thread integrity: Unlike cutting dies, it avoids crosscutting or undercutting, preserving thread profile and strength
  • Repair-only use: Designed solely for fixing worn/damaged threads; not suitable for cutting new threads or hardened steel/fasteners
  • Durable high-carbon alloy steel: Built for exceptional strength, wear resistance, and long-term reliability in repeated use
  • Ideal for mechanics & technicians: Essential tool for automotive, construction, and general maintenance/repair tasks

Editor's Notes

Written by SaltyOne | Staff

Original Post

Written by phoinix | Staff
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Amazon has Century Drill & Tool 1/2-20 NF Fractional Right Hand Rethreading Die (92910) on sale for $3.19. Shipping is free with Prime or on $35+ orders.

Thanks to Deal Hunter phoinix for sharing this deal.

Details:
  • Precision thread repair: Restores and cleans damaged threads on bolts/studs without removing excessive material; salvages hardware quickly and efficiently
  • Protects original thread integrity: Unlike cutting dies, it avoids crosscutting or undercutting, preserving thread profile and strength
  • Repair-only use: Designed solely for fixing worn/damaged threads; not suitable for cutting new threads or hardened steel/fasteners
  • Durable high-carbon alloy steel: Built for exceptional strength, wear resistance, and long-term reliability in repeated use
  • Ideal for mechanics & technicians: Essential tool for automotive, construction, and general maintenance/repair tasks

Editor's Notes

Written by SaltyOne | Staff

Original Post

Written by phoinix | Staff

Community Voting

Deal Score
+23
Good Deal
Visit Amazon

Price Intelligence

Model: Rethreading Die Fract Right Hand 1/2-20 National Fine Across Flats 3/4

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Sort: Lowest to Highest | Last Updated 5/20/2026, 04:35 PM
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Top Comments

AquaIdea9357
658 Posts
38 Reputation
This is only for rethreading damaged right-hand threads, not to put new threads on harded steel. Other sizes available. Some at similar prices or much higher than this price. 4.5 to 5.0 customer rating. Seems like a decent repair tool. Century drill & tool company, est'd 1940.

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Mar 09, 2026 04:04 AM
658 Posts
Joined Jun 2023
AquaIdea9357Mar 09, 2026 04:04 AM
658 Posts

Our community has rated this post as helpful. If you agree, why not thank AquaIdea9357

This is only for rethreading damaged right-hand threads, not to put new threads on harded steel. Other sizes available. Some at similar prices or much higher than this price. 4.5 to 5.0 customer rating. Seems like a decent repair tool. Century drill & tool company, est'd 1940.
Last edited by AquaIdea9357 March 8, 2026 at 09:07 PM.
2
Mar 09, 2026 04:25 AM
680 Posts
Joined Dec 2012
litesdsdMar 09, 2026 04:25 AM
680 Posts

Our community has rated this post as helpful. If you agree, why not thank litesdsd

1/2"-20 is not a common thread size. 1/2-13 is the common 1/2" thread size people commonly see. 1/2-20 is the fine thread variant of 1/2" threads. 1/2-20 is not very useful size for most people but the price is good.
2
2
Mar 09, 2026 04:26 AM
1,087 Posts
Joined Jan 2012
skoal2007Mar 09, 2026 04:26 AM
1,087 Posts
Review complained "the photo shows a die stamped "JAPAN". The thing I got isn't stamped"
Mar 09, 2026 04:32 AM
680 Posts
Joined Dec 2012
litesdsdMar 09, 2026 04:32 AM
680 Posts
Quote from AquaIdea9357 :
This is only for rethreading damaged right-hand threads, not to put new threads on harded steel. Other sizes available. Some at similar prices or much higher than this price. 4.5 to 5.0 customer rating. Seems like a decent repair tool. Century drill & tool company, est'd 1940.
Good point. Carbon steel dies are usually a rolled thread and only good for chasing threads. A High Speed Steel (HSS) die usually has ground threads and are capable of cutting new threads from round stock. Now that you pointed this out I'd say the price is not good for a single rolled thread die. Harbor Freight sells tap and die sets that would be a much better value with more common sizes.
1
Mar 09, 2026 06:26 AM
45 Posts
Joined Oct 2025
SplendidPartner5042Mar 09, 2026 06:26 AM
45 Posts
Pop would probably like this for his shop.
Mar 09, 2026 06:28 AM
189 Posts
Joined Nov 2003
cueball13Mar 09, 2026 06:28 AM
189 Posts
Quote from litesdsd :
1/2"-20 is not a common thread size. 1/2-13 is the common 1/2" thread size people commonly see. 1/2-20 is the fine thread variant of 1/2" threads. 1/2-20 is not very useful size for most people but the price is good.
Not a bad deal if you specifically need 1/2"-20, but as litesdsd points out it's not a super common size. If you need something to have around the shop for the occasional stripped bolt, better off getting one of the many thread chasing kits on the market that'll have most of the common sizes.
Mar 09, 2026 09:33 AM
235 Posts
Joined Jun 2025
informed-consumerMar 09, 2026 09:33 AM
235 Posts
Used a similar metric one for impact gun damaged exh. flange studs. Seemed to work pretty well , but some of the new replacement nuts went on with some binding even though I greased the studs. I was concerned about removing material and/or additional damage that a threading die might cause. Paid like $8 for a m10 x 1.25 . Pretty sure it was from the U.S. mfr.

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Mar 09, 2026 02:32 PM
17,472 Posts
Joined Nov 2003
deshwasiMar 09, 2026 02:32 PM
17,472 Posts
Quote from cueball13 :
Not a bad deal if you specifically need 1/2"-20, but as litesdsd points out it's not a super common size. If you need something to have around the shop for the occasional stripped bolt, better off getting one of the many thread chasing kits on the market that'll have most of the common sizes.
Any recommendations for a kit at home?
Mar 10, 2026 09:07 PM
185 Posts
Joined Oct 2011
jen7851Mar 10, 2026 09:07 PM
185 Posts
Picture is wrong, its showing your standard hex die which century makes in japan and can cut threads. Check the link and look at all the other sizes, its clearly shows the correct picture for the much cheaper thread chasing dies which dont cut threads and century makes in china.

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