Oversize Reforming Thread Taps,
to repair worn or damaged 1/4-28 threads, set of five

Each set contains five taps: .255-28 (+.005), .260-28 (+.010), .265-28 (+.015), .270-28 (+.020), .275-28 (+.025) over size 1/4-28 taps.
These are thread reforming taps. Use these taps, in sequence, to clean up a 1/4-28 thread. Install one of our matching oversize nipples. Never use a standard nipple in an oversize hole! Never use these taps to thread a new hole. Stop when threads are fully restored. Don't enlarge nipple seats unnecessarily.
Sturdy hardened steel. Use a tap handle. Use tapping fluid. Properly used, these should last a lifetime. They can be carelessly damaged, chipped, broken, and dulled. Not warranted against failure. Repairs are best performed by skilled gunsmiths, experienced machinists, or serious hobbyists.
These are thread reforming taps. Use these taps, in sequence, to clean up a 1/4-28 thread. Install one of our matching oversize nipples. Never use a standard nipple in an oversize hole! Never use these taps to thread a new hole. Stop when threads are fully restored. Don't enlarge nipple seats unnecessarily.
Sturdy hardened steel. Use a tap handle. Use tapping fluid. Properly used, these should last a lifetime. They can be carelessly damaged, chipped, broken, and dulled. Not warranted against failure. Repairs are best performed by skilled gunsmiths, experienced machinists, or serious hobbyists.
Oversize threaded nipple, .255-28, 1/4-28 with .005" oversize thread,
for CCI #11 cap, hardened steel,
square shank, ideal for restoration
- Cone length: 0.440"
- Thread journal length: 0.195"
- Overall length: 0.635"
- Diameter of base: 0.307"
Oversize threaded nipple, .255-28, 1/4-28 with .005" oversize thread, for CCI#11 cap, stainless steel
- Cone length: 0.440"
- Thread journal length: 0.195"
- Overall length: 0.635"
- Diameter of base: 0.307"
Oversize threaded nipple, .260-28, 1/4-28 with .010" oversize thread,
for CCI #11 cap, hardened steel,
square shank, ideal for restoration
- Cone length: 0.440"
- Thread journal length: 0.195"
- Overall length: 0.635"
- Diameter of base: 0.307"
Oversize threaded nipple, .260-28, 1/4-28 with .010" oversize thread, for CCI #11 cap, stainless steel
- Cone length: 0.440"
- Thread journal length: 0.195"
- Overall length: 0.635"
- Diameter of base: 0.307"
Oversize threaded nipple, .265-28, 1/4-28 with .015" oversize thread,
for CCI #11 cap, hardened steel,
square shank, ideal for restoration
- Cone length: 0.440"
- Thread journal length: 0.195"
- Overall length: 0.635"
- Diameter of base: 0.307"
Oversize threaded nipple, .265-28, 1/4-28 with .015" oversize thread, for CCI #11 cap, stainless steel
- Cone length: 0.440"
- Thread journal length: 0.195"
- Overall length: 0.635"
- Diameter of base: 0.307"
Oversize threaded nipple, .270-28,
1/4-28 with .020" oversize thread,
for CCI #11 cap, hardened steel,
square shank, ideal for restoration
- Cone length: 0.440"
- Thread journal length: 0.195"
- Overall length: 0.635"
- Diameter of base: 0.307"
Oversize threaded nipple, .270-28,
1/4-28 with .020" oversize thread,
for CCI #11 cap, stainless steel
- Cone length: 0.440"
- Thread journal length: 0.195"
- Overall length: 0.635"
- Diameter of base: 0.307"
Oversize threaded nipple, .275-28,
1/4-28 with .025" oversize thread,
for CCI #11 cap, hardened steel,
square shank, ideal for restoration
- Cone length: 0.440"
- Thread journal length: 0.195"
- Overall length: 0.635"
- Diameter of base: 0.307"
Oversize threaded nipple, .275-28,
1/4-28 with .025" oversize thread,
for CCI #11 cap, stainless steel
- Cone length: 0.440"
- Thread journal length: 0.195"
- Overall length: 0.635"
- Diameter of base: 0.307"
.255-28 Reforming Thread Tap,
+.005" oversize,
for 1/4-28 threads,
single tap, best used in sequence
.260-28 Reforming Thread Tap,
+.010" oversize,
for 1/4-28 threads,
single tap, best used in sequence
.265-28 Reforming Thread Tap,
+.015" oversize,
for 1/4-28 threads,
single tap, best used in sequence
.270-28 Reforming Thread Tap,
+.020" oversize,
for 1/4-28 threads,
single tap, best used in sequence
.275-28 Reforming Thread Tap,
+.025" oversize,
for 1/4-28 threads,
single tap, best used in sequence
All sizes are nominal. Please verify with description for more information.
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Reforming Taps for Repair1/4-28 + 0.005" ( 0.255-28 )1/4-28 + 0.010" ( 0.260-28 )1/4-28 + 0.015" ( 0.265-28 )1/4-28 + 0.020" ( 0.270-28 )1/4-28 + 0.025" ( 0.275-28 )
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Tap StyleReforming Tap
ROS-05-I
Oversize threaded nipple, .255-28, 1/4-28 with .005" oversize thread,
for CCI #11 cap, hardened steel,
square shank, ideal for restoration
Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"
ROS-05-S
Oversize threaded nipple, .255-28, 1/4-28 with .005" oversize thread, for CCI#11 cap, stainless steel
Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"
ROS-10-I
Oversize threaded nipple, .260-28, 1/4-28 with .010" oversize thread,
for CCI #11 cap, hardened steel,
square shank, ideal for restoration
Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"
ROS-10-S
Oversize threaded nipple, .260-28, 1/4-28 with .010" oversize thread, for CCI #11 cap, stainless steel
Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"
ROS-15-I
Oversize threaded nipple, .265-28, 1/4-28 with .015" oversize thread,
for CCI #11 cap, hardened steel,
square shank, ideal for restoration
Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"
ROS-15-S
Oversize threaded nipple, .265-28, 1/4-28 with .015" oversize thread, for CCI #11 cap, stainless steel
Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"
ROS-20-I
Oversize threaded nipple, .270-28,
1/4-28 with .020" oversize thread,
for CCI #11 cap, hardened steel,
square shank, ideal for restoration
Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"
ROS-20-S
Oversize threaded nipple, .270-28,
1/4-28 with .020" oversize thread,
for CCI #11 cap, stainless steel
Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"
ROS-25-I
Oversize threaded nipple, .275-28,
1/4-28 with .025" oversize thread,
for CCI #11 cap, hardened steel,
square shank, ideal for restoration
Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"
ROS-25-S
Oversize threaded nipple, .275-28,
1/4-28 with .025" oversize thread,
for CCI #11 cap, stainless steel
Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"
TOOL-TAP-05
.255-28 Reforming Thread Tap,
+.005" oversize,
for 1/4-28 threads,
single tap, best used in sequence
TOOL-TAP-10
.260-28 Reforming Thread Tap,
+.010" oversize,
for 1/4-28 threads,
single tap, best used in sequence
TOOL-TAP-15
.265-28 Reforming Thread Tap,
+.015" oversize,
for 1/4-28 threads,
single tap, best used in sequence
TOOL-TAP-20
.270-28 Reforming Thread Tap,
+.020" oversize,
for 1/4-28 threads,
single tap, best used in sequence
TOOL-TAP-25
.275-28 Reforming Thread Tap,
+.025" oversize,
for 1/4-28 threads,
single tap, best used in sequence