Look at my other ads or contact me for smaller or larger quantities I have about 250 of these available I can sell singles or give you a deal on larger quantities these are military surplus save big money
Product Specs:
Internal Thread Size: 7/8-14
External Thread Size: 1 1/4-12 
Wall Type: Heavy Duty
Length: 1.250"
Internal Thread Lock: No
External Thread Lock: Yes
Number of Locking Keys: 4
Material: 303 Stainless Steel
Tap Size: 1 1/4-12
Drill Size: 1 3/16
Package Quantity: 10
Description:
Key Locking Thread Inserts are an ideal solution to repair stripped, damaged and worn threads or to provide thread reinforcement in a weaker parent material, especially when the mating stud or bolt will be removed frequently.  They provide strong, permanent threads in virtually any material - ferrous, non-ferrous, or non-metallic.  The insert's locking keys are driven down into the tapped threads of the parent material during installation creating a positive mechanical lock that prevents rotation due to vibration or torsion.  Their external thread design provide maximum pull-out strength with a minimal outside diameter.
MS51831-210 / ALT TO FAIRCHILD KNH1414J / CHRISLYNN 76510 / 7/8-14 ID X 1-1/4-12 OD HEAVY DUTY KEENSERT® SS303
Product Details
MS/NAS P/N:MS51831-210
Type:Heavy Duty
Internal Thread Size:7/8-14
Internal Thread Class:3B
External Thread Size:1-1/4-12
External Thread Class:2A (Mod)
Nominal Length Q Inch:1.25
Insert Material:Stainless Steel - 303 CRES
Insert Finish:Passivated
Locking Keys #:4
P/N:KNH1414J
P/N:KNH1414J
P/N:76510
P/N:3734-7/8HD