Internal Helical Slot Laps, Arbors, And Expanders

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Expanding Internal Laps

should be longer than the length of the bore being lapped.

Standard Internal Laps

are manufactured undersize to allow for stock removal and abrasive clearance. Order a 1/4″ lap to finish a .2500 dia. bore.

Radial Grooves

are recommended for most lapping applications; however, there are instances when non-grooved laps are recommended, such as when lapping interrupted bores.

SPECIAL SIZE AND/OR LENGTH LAPS AND ARBORS CAN BE MADE TO SUIT YOUR APPLICATION.

*Standard lap arbors 4/0 thru 5 are manufactured without centers. These arbors are available with centers (additional charge)
internal-helical-lap-diagram
internal-lap-radial-grooves
internal-lap-arbor-diagram1-a
Part #
With Radial
Grooves
Part #
No Radial
Grooves
A
Lap Size
B
Length
ArborA
Shank Diameter
B
Shank Length
C
Taper Length
ExpanderLap
Puller
N/A3/64 NSIL3/641/2 4/0 SLA*1/83/41-1/2 4/0 SLE0LP
N/A1/16 SIL1/165/8 3/0 SLA*1/83/41-1/2 3/0 SLE0LP
N/A5/64 SIL5/645/8 3/0 SLA*1/83/41-1/2 3/0 SLE0LP
N/A3/32 SIL3/323/42/0 SLA*1/83/41-5/82/0 SLE0LP
N/A7/64 SIL7/643/42/0 SLA*1/83/41-5/82/0 SLE0LP
N/A1/8 SIL1/87/8 0 SLA*1/83/41-3/4 0 SLE0LP
N/A5/32 SIL5/327/8 0 SLA*1/83/41-3/4 0 SLE0LP
N/A9/64 SIL9/647/8 0 SLA*1/83/41-3/4 0 SLE0LP
N/A11/64 SIL11/647/8 0 SLA*1/83/41-3/4 0 SLE0LP
3/16 SILS3/16 SILSNRG3/161 1 SLA*3/1612-3/4 1 SLE1LP
3/16 SILL3/16 SILLNRG3/161-3/8 1 SLA*3/1612-3/4 1 SLE1LP
13/64 SILS13/64 SILSNRG13/641 1 SLA*3/1612-3/4 1 SLE1LP
13/64 SILL13/64 SILLNRG13/641-3/8 1 SLA*3/1612-3/4 1 SLE1LP
7/32 SILS7/32 SILSNRG7/321-1/42 SLA*3/1613 2 SLE1LP
7/32 SILL7/32 SILLNRG7/321-3/42 SLA*3/1613 2 SLE1LP
15/64 SILS15/64 SILSNRG15/641-1/42 SLA*3/1613 2 SLE1LP
15/64 SILL15/64 SILLNRG15/641-3/42 SLA*3/1613 2 SLE1LP
1/4 SILS1/4 SILSNRG1/41-1/23 SLA*3/1614 3 SLE1LP
1/4 SILL1/4 SILLNRG1/423 SLA*3/1614 3 SLE1LP
17/64 SILS17/64 SILSNRG17/641-1/23 SLA*3/1614 3 SLE1LP
17/64 SILL17/64 SILLNRG17/6423 SLA*3/1614 3 SLE1LP
9/32 SILS9/32 SILSNRG9/321-1/23 SLA*3/1614 3 SLE1LP
9/32 SILL9/32 SILLNRG9/3223 SLA*3/1614 3 SLE1LP
19/64 SILS19/64 SILSNRG19/641-1/23 SLA*3/1614 3 SLE1LP
19/64 SILL19/64 SILLNRG19/6423 SLA*3/1614 3 SLE1LP
5/16 SILS5/16 SILSNRG5/161-1/2 4 SLA*7/3214 4 SLE1LP
5/16 SILL5/16 SILLNRG5/162 4 SLA*7/3214 4 SLE1LP
21/64 SILS21/64 SILSNRG21/641-1/2 4 SLA*7/3214 4 SLE1LP
21/64 SILL21/64 SILLNRG21/642 4 SLA*7/3214 4 SLE1LP
11/32 SILS11/32 SILSNRG11/321-1/2 4 SLA*7/3214 4 SLE1LP
11/32 SILL11/32 SILLNRG11/322 4 SLA*7/3214 4 SLE1LP
23/64 SILS23/64 SILSNRG23/641-1/2 4 SLA*7/3214 4 SLE1LP
23/64 SILL23/64 SILLNRG23/642 4 SLA*7/3214 4 SLE1LP
3/8 SILS3/8 SILSNRG3/81-3/4 5 SLA*9/321-1/25 5 SLE1LP
3/8 SILL3/8 SILLNRG3/82-1/2 5 SLA*9/321-1/25 5 SLE1LP
25/64 SILS25/64 SILSNRG25/641-3/4 5 SLA*9/321-1/25 5 SLE1LP
25/64 SILL25/64 SILLNRG25/642-1/2 5 SLA*9/321-1/25 5 SLE1LP
13/32 SILS13/32 SILSNRG13/321-3/4 5 SLA*9/321-1/25 5 SLE1LP
13/32 SILL13/32 SILLNRG13/322-1/2 5 SLA*9/321-1/25 5 SLE1LP
27/64 SILS27/64 SILSNRG27/641-3/4 5 SLA*9/321-1/25 5 SLE1LP
27/64 SILL27/64 SILLNRG27/642-1/2 5 SLA*9/321-1/25 5 SLE1LP
7/16 SILS7/16 SILSNRG7/161-3/4 6 SLA5/161-1/25 6 SLE1LP
7/16 SILL7/16 SILLNRG7/162-1/2 6 SLA5/161-1/25 6 SLE1LP
29/64 SILS29/64 SILSNRG29/641-3/4 6 SLA5/161-1/25 6 SLE1LP
29/64 SILL29/64 SILLNRG29/642-1/2 6 SLA5/161-1/25 6 SLE1LP
15/32 SILS15/32 SILSNRG15/321-3/4 6 SLA5/161-1/25 6 SLE1LP
15/32 SILL15/32 SILLNRG15/322-1/2 6 SLA5/161-1/25 6 SLE1LP
31/64 SILS31/64 SILSNRG31/641-3/4 6 SLA5/161-1/25 6 SLE1LP
31/64 SILL31/64 SILLNRG31/642-1/2 6 SLA5/161-1/25 6 SLE1LP
1/2 SILS1/2 SILSNRG1/22-1/4 7 SLA3/81-1/26 7 SLE1LP
1/2 SILL1/2 SILLNRG1/23-1/4 7 SLA3/81-1/26 7 SLE1LP
33/64 NSILS33/64 NSILSNRG33/642-1/4 7 SLA3/81-1/26 7 SLE1LP
33/64 NSILL33/64 NSILLNRG33/643-1/4 7 SLA3/81-1/26 7 SLE1LP
17/32 SILS17/32 SILSNRG17/322-1/4 7 SLA3/81-1/26 7 SLE1LP
17/32 SILL17/32 SILLNRG17/323-1/4 7 SLA3/81-1/26 7 SLE1LP
35/64 NSILS35/64 NSILSNRG35/642-1/4 7 SLA3/81-1/26 7 SLE1LP
35/64 NSILL35/64 NSILLNRG35/643-1/4 7 SLA3/81-1/26 7 SLE1LP
9/16 SILS9/16 SILSNRG9/162-1/4 7 SLA3/81-1/26 7 SLE1LP
9/16 SILL9/16 SILLNRG9/163-1/4 7 SLA3/81-1/26 7 SLE1LP
37/64 NSILS37/64 NSILSNRG37/642-1/4 7 SLA3/81-1/26 7 SLE1LP
37/64 NSILL37/64 NSILLNRG37/643-1/4 7 SLA3/81-1/26 7 SLE1LP
19/32 SILS19/32 SILSNRG19/322-1/4 7 SLA3/81-1/26 7 SLE1LP
19/32 SILL19/32 SILLNRG19/323-1/4 7 SLA3/81-1/26 7 SLE1LP
39/64 NSILS39/64 NSILSNRG39/642-1/4 7 SLA3/81-1/26 7 SLE1LP
39/64 NSILL39/64 NSILLNRG39/643-1/4 7 SLA3/81-1/26 7 SLE1LP
5/8 SILS5/8 SILSNRG5/82-1/4 8 SLA13/321-1/26 8 SLE2LP
5/8 SILL5/8 SILLNRG5/83-1/4 8 SLA13/321-1/26 8 SLE2LP
41/64 NSILS41/64 NSILSNRG41/642-1/4 8 SLA13/321-1/26 8 SLE2LP
41/64 NSILL41/64 NSILLNRG41/643-1/4 8 SLA13/321-1/26 8 SLE2LP
21/32 SILS21/32 SILSNRG21/322-1/4 8 SLA13/321-1/26 8 SLE2LP
21/32 SILL21/32 SILLNRG21/323-1/4 8 SLA13/321-1/26 8 SLE2LP
43/64 NSILS43/64 NSILSNRG43/642-1/4 8 SLA13/321-1/26 8 SLE2LP
43/64 NSILL43/64 NSILLNRG43/643-1/4 8 SLA13/321-1/26 8 SLE2LP
11/16 SILS11/16 SILSNRG11/162-1/4 8 SLA13/321-1/26 8 SLE2LP
11/16 SILL11/16 SILLNRG11/163-1/4 8 SLA13/321-1/26 8 SLE2LP
45/64 NSILS 45/64 NSILSNRG45/642-1/4 8 SLA13/321-1/26 8 SLE2LP
45/64 NSILL45/64 NSILLNRG45/643-1/4 8 SLA13/321-1/26 8 SLE2LP
23/32 SILS23/32 SILSNRG23/322-1/4 8 SLA13/321-1/26 8 SLE2LP
23/32 SILL23/32 SILLNRG23/323-1/4 8 SLA13/321-1/26 8 SLE2LP
47/64 NSILS47/64 NSILSNRG47/642-1/4 8 SLA13/321-1/26 8 SLE2LP
47/64 NSILL47/64 NSILLNRG47/643-1/4 8 SLA13/321-1/26 8 SLE2LP
3/4 SILS3/4 SILSNRG3/42-1/2 9 SLA1/227 9 SLE2LP
3/4 SILL3/4 SILLNRG3/43-1/2 9 SLA1/227 9 SLE2LP
49/64 NSILS49/64 NSILSNRG49/642-1/2 9 SLA1/227 9 SLE2LP
49/64 NSILL49/64 NSILLNRG49/643-1/2 9 SLA1/227 9 SLE2LP
25/32 SILS25/32 SILSNRG25/322-1/2 9 SLA1/227 9 SLE2LP
25/32 SILL25/32 SILLNRG25/323-1/2 9 SLA1/227 9 SLE2LP
51/64 NSILS51/64 NSILSNRG51/642-1/2 9 SLA1/227 9 SLE2LP
51/64 NSILL51/64 NSILLNRG51/643-1/2 9 SLA1/227 9 SLE2LP
13/16 SILS13/16 SILSNRG13/162-1/2 9 SLA1/227 9 SLE2LP
13/16 SILL13/16 SILLNRG13/163-1/2 9 SLA1/227 9 SLE2LP
53/64 NSILS53/64 NSILSNRG53/642-1/2 9 SLA1/227 9 SLE2LP
53/64 NSILL53/64 NSILLNRG53/643-1/2 9 SLA1/227 9 SLE2LP
27/32 SILS27/32 SILSNRG27/322-1/2 9 SLA1/227 9 SLE2LP
27/32 SILL27/32 SILLNRG27/323-1/2 9 SLA1/227 9 SLE2LP
55/64 NSILS55/64 NSILSNRG55/642-1/2 9 SLA1/227 9 SLE2LP
55/64 NSILL55/64 NSILLNRG55/643-1/2 9 SLA1/227 9 SLE2LP
7/8 SILS7/8 SILSNRG7/82-1/2 10 SLA9/1627 10 SLE2LP
7/8 SILL7/8 SILLNRG7/83-1/2 10 SLA9/1627 10 SLE2LP
57/64 NSILS57/64 NSILSNRG57/642-1/2 10 SLA9/1627 10 SLE2LP
57/64 NSILL57/64 NSILLNRG57/643-1/2 10 SLA9/1627 10 SLE2LP
29/32 SILS29/32 SILSNRG29/322-1/2 10 SLA9/1627 10 SLE2LP
29/32 SILL29/32 SILLNRG29/323-1/2 10 SLA9/1627 10 SLE2LP
59/64 NSILS59/64 NSILSNRG59/642-1/2 10 SLA9/1627 10 SLE2LP
59/64 NSILL59/64 NSILLNRG59/643-1/2 10 SLA9/1627 10 SLE2LP
15/16 SILS15/16 SILSNRG15/162-1/2 10 SLA9/1627 10 SLE2LP
15/16 SILL15/16 SILLNRG15/163-1/2 10 SLA9/1627 10 SLE2LP
61/64 NSILS61/64 NSILSNRG61/642-1/2 10 SLA9/1627 10 SLE2LP
61/64 NSILL61/64 NSILLNRG61/643-1/2 10 SLA9/1627 10 SLE2LP
31/32 SILS31/32 SILSNRG31/322-1/2 10 SLA9/1627 10 SLE2LP
31/32 SILL31/32 SILLNRG31/323-1/2 10 SLA9/1627 10 SLE2LP
63/64 NSILS63/64 NSILSNRG63/642-1/2 10 SLA9/1627 10 SLE2LP
63/64 NSILL63/64 NSILLNRG63/643-1/2 10 SLA9/1627 10 SLE2LP
1 SILS1 SILSNRG1311 SLA3/428 11 SLE2LP
1 SILL1 SILLNRG1411 SLA3/428 11 SLE2LP
1-1/64 NSILS1-1/64 NSILSNRG1-1/64311 SLA3/428 11 SLE2LP
1-1/64 NSILL1-1/64 NSILLNRG1-1/64411 SLA3/428 11 SLE2LP
1-1/32 NSILS1-1/32 NSILSNRG1-1/32311 SLA3/428 11 SLE2LP
1-1/32 NSILL1-1/32 NSILLNRG1-1/32411 SLA3/428 11 SLE2LP
1-3/64 NSILS1-3/64 NSILSNRG1-3/64311 SLA3/428 11 SLE2LP
1-3/64 NSILL1-3/64 NSILLNRG1-3/64411 SLA3/428 11 SLE2LP
1-1/16 SILS1-1/16 SILSNRG1-1/16311 SLA3/428 11 SLE2LP
1-1/16 SILL1-1/16 SILLNRG1-1/16411 SLA3/428 11 SLE2LP
1-5/64 NSILS1-5/64 NSILSNRG1-5/64311 SLA3/428 11 SLE2LP
1-5/64 NSILL1-5/64 NSILLNRG1-5/64411 SLA3/428 11 SLE2LP
1-3/32 NSILS1-3/32 NSILSNRG1-3/32311 SLA3/428 11 SLE2LP
1-3/32 NSILL1-3/32 NSILLNRG1-3/32411 SLA3/428 11 SLE2LP
1-7/64 NSILS1-7/64 NSILSNRG1-7/64311 SLA3/428 11 SLE2LP
1-7/64 NSILL1-7/64 NSILLNRG1-7/64411 SLA3/428 11 SLE2LP
1-1/8 SILS1-1/8 SILSNRG1-1/8311 SLA3/428 11 SLE2LP
1-1/8 SILL1-1/8 SILLNRG1-1/8411 SLA3/428 11 SLE2LP
1-9/64 NSILS1-9/64 NSILSNRG1-9/64311 SLA3/428 11 SLE2LP
1-9/64 NSILL1-9/64 NSILLNRG1-9/64411 SLA3/428 11 SLE2LP
1-5/32 NSILS1-5/32 NSILSNRG1-5/32311 SLA3/428 11 SLE2LP
1-5/32 NSILL1-5/32 NSILLNRG1-5/32411 SLA3/428 11 SLE2LP
1-11/64 NSILS1-11/64 NSILSNRG1-11/64311 SLA3/428 11 SLE2LP
1-11/64 NSILL1-11/64 NSILLNRG1-11/64411 SLA3/428 11 SLE2LP
1-3/16 SILS1-3/16 SILSNRG1-3/16311 SLA3/428 11 SLE2LP
1-3/16 SILL1-3/16 SILLNRG1-3/16411 SLA3/428 11 SLE2LP
1-13/64 NSILS1-13/64 NSILSNRG1-13/64311 SLA3/428 11 SLE2LP
1-13/64 NSILL1-13/64 NSILLNRG1-13/64411 SLA3/428 11 SLE2LP
1-7/32 NSILS1-7/32 NSILSNRG1-7/32311 SLA3/428 11 SLE2LP
1-7/32 NSILL1-7/32 NSILLNRG1-7/32411 SLA3/428 11 SLE2LP
1-15/64 NSILS1-15/64 NSILSNRG1-15/64311 SLA3/428 11 SLE2LP
1-15/64 NSILL1-15/64 NSILLNRG1-15/64411 SLA3/428 11 SLE2LP
1-1/4 SILS1-1/4 SILSNRG1-1/4311 SLA3/428 11 SLE2LP
1-1/4 SILL1-1/4 SILLNRG1-1/4411 SLA3/428 11 SLE2LP
1-5/16 SIL1-5/16 SILNRG1-5/164 12 SLA7/82-1/27-1/2 12 SLE3LP
1-3/8 SIL1-3/8 SILNRG1-3/84 12 SLA7/82-1/27-1/2 12 SLE3LP
1-7/16 SIL1-7/16 SILNRG1-7/164 12 SLA7/82-1/27-1/2 12 SLE3LP
1-1/2 SIL1-1/2 SILNRG1-1/24 12 SLA7/82-1/27-1/2 12 SLE3LP
1-9/16 SIL1-9/16 SILNRG1-9/164 12 SLA7/82-1/27-1/2 12 SLE3LP
1-5/8 SIL1-5/8 SILNRG1-5/84 12 SLA7/82-1/27-1/2 12 SLE3LP
1-11/16 SIL1-11/16 SILNRG1-11/164 13 SLA12-1/27-1/2 13 SLE3LP
1-3/4 SIL1-3/4 SILNRG1-3/44 13 SLA12-1/27-1/2 13 SLE3LP
1-13/16 SIL1-13/16 SILNRG1-13/164 13 SLA12-1/27-1/2 13 SLE3LP
1-7/8 SIL1-7/8 SILNRG1-7/84 13 SLA12-1/27-1/2 13 SLE3LP
1-15/16 SIL1-15/16 SILNRG1-15/164 13 SLA12-1/27-1/2 13 SLE3LP
2 SIL2 SILNRG24 13 SLA12-1/27-1/2 13 SLE3LP
2-1/16 NSIL2-1/16 NSILNRG2-1/16414 SLA1-1/42-1/27-1/2 14 SLE3LP
2-1/8 NSIL2-1/8 NSILNRG2-1/8414 SLA1-1/42-1/27-1/2 14 SLE3LP
2-3/16 NSIL2-3/16 NSILNRG2-3/16414 SLA1-1/42-1/27-1/2 14 SLE3LP
2-1/4 NSIL2-1/4 NSILNRG2-1/4414 SLA1-1/42-1/27-1/2 14 SLE3LP
2-5/16 NSIL2-5/16 NSILNRG2-5/16414 SLA1-1/42-1/27-1/2 14 SLE3LP
2-3/8 NSIL2-3/8 NSILNRG2-3/8414 SLA1-1/42-1/27-1/2 14 SLE3LP
2-7/16 NSIL2-7/16 NSILNRG2-7/164 15 SLA1-1/22-1/27-1/2 15 SLE3LP
2-1/2 NSIL2-1/2 NSILNRG2-1/24 15 SLA1-1/22-1/27-1/2 15 SLE3LP
2-9/16 NSIL2-9/16 NSILNRG2-9/164 15 SLA1-1/22-1/27-1/2 15 SLE3LP
2-5/8 NSIL2-5/8 NSILNRG2-5/84 15 SLA1-1/22-1/27-1/2 15 SLE3LP
2-11/16 NSIL2-11/16 NSILNRG2-11/164 15 SLA1-1/22-1/27-1/2 15 SLE3LP
2-3/4 NSIL2-3/4 NSILNRG2-3/44 16 SLA1-3/42-1/27-1/2 16 SLE3LP
2-13/16 NSIL2-13/16 NSILNRG2-13/164 16 SLA1-3/42-1/27-1/2 16 SLE3LP
2-7/8 NSIL2-7/8 NSILNRG2-7/84 16 SLA1-3/42-1/27-1/2 16 SLE3LP
2-15/16 NSIL2-15/16 NSILNRG2-15/164 16 SLA1-3/42-1/27-1/2 16 SLE3LP
3 NSIL3 NSILNRG34 16 SLA1-3/42-1/27-1/2 16 SLE3LP

Lap Pullers

Part #DescriptionArborLap Size
0LPExtra Small Lap PullerFits Arbors 4/0 thru 0Lap Sizes 3/64" to 11/64"
1LPSmall Lap PullerFits Arbors 1 thru 7Lap Sizes 3/16" to 39/64"
2LPLarge Lap PullerFits Arbors 8 thru 11Lap Sizes 5/8" to 1-1/4"
3LPExtra Large Lap PullerFits Arbors 12 thru 16Lap Sizes 1-5/16" to 3"
Lap Pullers are used to remove the lap from the arbor or to retract the lap when over expanded.
lap-puller