Home Determining Your Lathe Spindle Thread to find the correct NOVA insert adapter

Determining Your Lathe Spindle Thread to find the correct NOVA insert adapter

Determining Your Lathe Spindle Thread to find the correct NOVA insert adapter

1. Refer to the insert/adaptor chart (below) to see if your lathe is listed.
If listed make a note of the SKU:______ (example IDNS, IENS, etc)

2. If not listed, look in your manual or sales literature to find the thread size.

Make a note of these:
Machine make:
Machine model thread size (if known):
Inboard thread (LH – left hand or RH right hand or both:
(Look at our insert/adaptor chart below to find your size)

3. If you don’t have a manual, contact your supplier to get a copy of your manual and find out your spindle size. If they don’t have the info you can call your manufacturer. (Then look at our insert/adaptor chart below to find your size).

4. If you have reliable information for your spindle thread size but there is no match on the chart, you may have
an unusual lathe that NOVA doesn’t have an adaptor for. You will need to purchase a blank chuck or a blank insert/adaptor and get it threaded to your requirements.

5. If you can’t find the information on your spindle thread size you will need to take some measurements on your lathe spindle. You only need to do these measurements if you can’t find the info anywhere else.

1. Outside diameter of thread:
2. Pitch of thread:
3. Length of thread:
4. Register diameter:
5. Register length:

Ensure that the thread on the adapter and lathe spindle has the exact same pitch and standard. Even if the thread size is the same there are different standards of threads, e.g. UNC/UNF and BSW. If mismatching standard threads are used it may cause damage to both lathe and chuck therefore you will have to know the thread of the spindle accurately.
A reference to quickly distinguish between Unified (UNC or UNF) and British (BSF or BSW) standards:

FLAT TOP = 60° angle (UNC, UNF, Metric threads)                           ROUND TOP = 55° angle: Whitworth, BSW, BSF 


BSF: British Standard Fine
BSW: British Standard Whitworth
RH: Right hand
LH: Left hand
TPI: Threads per inch
UN: Unified National Standard
UNC: Unified Coarse Standard
UNF: Unified Fine Standard
UNS: Unified Special

These thread sizes listed are the size which the adaptor converts to (e.g. The thread size listed in the table should match the thread size on your lathe spindle.)

Chuck Inserts from NOVA

Set Screw
I2NSM202 Tyme Cub
I3NSM201.5 Electra Beckum,
Multico Sumaro
I6NS3/4″Plain Bore M6
I9NS3/4″16TPIRH(with 6mm register)
IANS3/4″4TPIRHBSP TL1000 (pre 1986)
IBNS3/4″4TPILHBSP TL1000 (pre 1986)
ICNS1″10TPIRHBSF TL1000, Woodfast/Durden
IDNS1″8TPIRHUNC Delta, Rockwell, Golding,
General, NOVA Comet (North America)
and Mercury lathes
IHNS3/4″10TPIRHBSW Rockwell
Arundel K600/K450
IJNS1 1/8″12TPIRH BSW Myford Mystro
Masterlathe (New Zealand)
IKNSM182.5RH Elu DB 180
ILNS1 1/4″8TPIRH NOVA Galaxi, NOVA Saturn, NOVA DVR 3000, NOVA XP, NOVA 1624 and 1624 II (North America),
Laguna Revo
INNSBlank (Can be threaded up to 28mm)
IQNSM303.5RHNOVA TL1500/3000/Comet
(European & Southern Hemisphere)
IRNS1″8TPIRHJet 1221 Lathe
ISNS5/8″Plain BoreDesigned Specifically for
Shopsmith Pro V and
Power Pro Machines
ITNS1″8TPIDual Threaded LH and RHNOVA Mercury Mini Lathe
IUNS1 1/8″12TPIRHUNFTaiwanese lathes
IYNS1 1/4″8TPIRHFor lathes don’t
have reverse turning ability
IWNSM252RH Tyme Avon (’83 on) and Classic Tanner SD165, Selbix Springwood, Sorby, Cotech
IXNS1″8TPIRHDesigned specifically for the
NOVA Comet II Midi Lathe,
features lock for the reverse function.