Internal Helical Slot Laps, Arbors, And Expanders

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
Arbor
A
Shank Diameter
B
Shank Length
C
Taper Length
Expander
Lap
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 #
Description
Arbor
Lap 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