21.51 CCMT Inserts For the G4003, 7x, 8x12/14, 9x20 Lathes - Thumbs Up! · Mar 10, 09:22

We started this insert tooling journey for the lathe by buying the cheap and ubiquitous triangle insert 5-tool holder set from ENCO. They usually sell these sets for around $20 and inserts go for around $4. These work OK for the mini-lathe and even up to the 12x, but we wanted something with a chipbreaker, a smaller cutting radius and reliefs that would better suit the smaller machines. After a call to J&L Metalworking, one of the techs recommended the SCLCR holder (from Hertel) and accompanying 21.51 inserts. Although this is an insert with four usable cutting edges, two of them are at 80 degrees and the other two are at 100 degrees. This means that in order to get all four cutting edges used, we would need two separate holders. They, unfortunately could not source the toolholder that utilizes the oblique-angle edges. Thus, we plugged along until just recently and on a whim, we checked eBay. Luckily for us, there happened to be an insert holder made by the “MICRO 100” company that used these other edges for the 21.51 inserts. Great! $25 and a few days later, the toolholder arrived:

In short, make sure you buy a set of holders. These inserts work great from the 7x to the 12x lathes. While insert prices themselves are rather pricey at $7 or so each, remember that they provide 4 cutting edges making each edge a bit over $1.50 or so – a price of a cup of coffee.

If you’re on the hunt for the exact same setup, try Grainger! They have these toolholders on clearance right now.

Here are the specs for both holders:

MICRO 100 1/2” 75 Deg TURNING TOOL CCMT 21.51

MICRO 100 SUPER CARBIDE

* 1/2” CARBIDE INDEXABLE TURNING TOOL UTILIZING CCMT 21.51 INSERTS * Utilizing 100 Deg. Unused RH Cutting Corner of Insert. * Made in USA * Square Shank: 1/2” * Overall Length: 3” * Size: SCBCR 0808 F2 * PART#: 10-3157 * LIST PRICE: $43.95

KENNEMETAL HERTEL SCLCR-082 NE7 List Price $45.89
OR
HERTEL 2650823 Sclcr082 1/2” Shank Hertel Turning Toolholder List Price $57.03
MSC sells the Kennemetal version (MSC #1094479) for $65.78. Be sure to get a free shipping coupon.

Item Indexable Toolholder
Type Without Shim
Nomenclature SCLCR082
Style SCLC
Lock Screw-On
Cutting Edge Type -5 Deg Side and End Cutting Edge
Rake Positive
Rake Angle (Deg.) 7
Left/Right Hand Right Hand
Shank Width (In.) 1/2
Shank Offset
Shank Height (In.) 1/2
Overall Length (In.) 3 1/2
Nose Radius (In.) 1/64
For Use With CCMT, CPMT, CCMG, CCGG, CCGT
Insert Shape 80 Deg Diamond
Inscribed Circle (In.) 1/4
Insert Thickness (In.) 3/32
Insert Screw MS1153
Torx Wrench T7
Dimension A (In.) 0.500
Dimension B (In.) 0.500
Dimension C (In.) 3.5
Dimension E (In.) 0.500
Dimension F (In.) 0.625
Weight 0.25

* Screw-Lock Carbide Insert Toolholders * Locking screw holds inserts down for O. D. turning on manual and CNC lathes. * Shipped with all hardware except gage insert. Use appropriate insert grade and geometry for optimum performance. * Positive rake * Offset shank * California Proposition 65 Warning: This product contains a product known to the State of California to cause cancer.

Carbide Insert Toolholder, Without Shim, Style SCLC, Screw-On Lock, -5 Deg Side and End Cutting Edge, Positive Rake, Rake Angle 7 Deg, Right Hand, Offset Shank, Shank Width 1/2 In, Shank Height 1/2 In, Overall Length 3 1/2 In, Nose Radius 1/64 In, For Use With CCMT, CPMT, CCMG, CCGG, CCGT, 80 Deg Diamond Insert Shape, Inscribed Circle 1/4 In, Insert Thickness 3/32 In

Amazing that Grainger sells these inserts as well:

Turning Insert, With Chipbreaker, Style CCMT-DF, RC1502 Grade, TiN PVD Coating, 80 Deg Diamond Insert Shape, Inscribed Circle 1/4 In, Insert Thickness 3/32 In, Nose Radius 1/64 In, Positive Rake, Rake Angle 7 Deg, Screw-On Mounting Style, Mounting Hole Dia 0.1100 In, For Use With 2CUP4 and 2CUP5 Toolholders, 2CUJ7 and 2CUK1 Boring Bars
Grainger Item # 2LAN4
Price (ea.) $7.25
Brand RTW
Mfr. Model # CCMT2151DF
Ship Qty. 1
Sell Qty. (Will-Call) 1
Ship Weight (lbs.) 0.01
Usually Ships** While Stock Lasts
Catalog Page No. N/A
Country of Origin
(Country of Origin is subject to change.) USA

Item Turning Insert
Type With Chipbreaker
Nomenclature CCMT2151DF
Style CCMT-DF
Grade RC1502
Coating TiN PVD
Insert Shape 80 Deg Diamond
Inscribed Circle (In.) 1/4
Insert Thickness (In.) 3/32
Nose Radius (In.) 1/64
Mounting Hole Dia. (In.) 0.1100
Rake Positive
Rake Angle (Deg.) 7
Mounting Style Screw-On
For Use With 2CUP4 and 2CUP5 Toolholders, 2CUJ7 and 2CUK1 Boring Bars
Dimension B (In.) 0.0608
Dimension R (In.) 1/64
Dimension T (In.) 3/32
Package Quantity 1

Carbide Insert Toolholder, Without Shim, Style SCLC, Screw-On Lock, -5 Deg Side and End Cutting Edge, Positive Rake, Rake Angle 7 Deg, Right Hand, Offset Shank, Shank Width 1/2 In, Shank Height 1/2 In, Overall Length 3 1/2 In, Nose Radius 1/64 In, For Use With CCMT, CPMT, CCMG, CCGG, CCGT, 80 Deg Diamond Insert Shape, Inscribed Circle 1/4 In, Insert Thickness 3/32 In
Grainger Item # 2CUP5
Price (ea.) $17.47
Brand RTW
Mfr. Model # SCLCR082
Ship Qty. 1
Sell Qty. (Will-Call) 1
Ship Weight (lbs.) 0.25
Usually Ships** While Stock Lasts
Catalog Page No. N/A
Country of Origin
(Country of Origin is subject to change.) USA

Item Indexable Toolholder
Type Without Shim
Nomenclature SCLCR082
Style SCLC
Lock Screw-On
Cutting Edge Type -5 Deg Side and End Cutting Edge
Rake Positive
Rake Angle (Deg.) 7
Left/Right Hand Right Hand
Shank Width (In.) 1/2
Shank Offset
Shank Height (In.) 1/2
Overall Length (In.) 3 1/2
Nose Radius (In.) 1/64
For Use With CCMT, CPMT, CCMG, CCGG, CCGT
Insert Shape 80 Deg Diamond
Inscribed Circle (In.) 1/4
Insert Thickness (In.) 3/32
Insert Screw MS1153
Torx Wrench T7
Dimension A (In.) 0.500
Dimension B (In.) 0.500
Dimension C (In.) 3.5
Dimension E (In.) 0.500
Dimension F (In.) 0.625

Sandvick Coromat has a PDF with some more info on these toolholders (as well as others):

http://www2.coromant.sandvik.com/coromant/pdf/CoroKey_2007/usa/102-121.pdf

Happy insert hunting! It’s not easy, so be prepared ;)

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