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Description
SHANK25 mm
BLADE26 mm
LENGTH86 mm
WIDTH42 mm
SMBB 2526 parting tool block – technical data
Dimensions and specifications of the Varel holder
| Technical data | |
|---|---|
| Type | SMBB 2526 |
| Tool post shank | 25 mm |
| Blade height | 26 mm |
| Shank height (H1) | 25 mm |
| Overall height (H) | 46.6 mm |
| Base width (k) | 23 mm |
| Overall width (K) | 42 mm |
| Length (L) | 86 mm |
| Blade clamp | upper jaw with hex socket screws |
| Blades | Varel SPB x26 |
| Manufacturer | Varel |
Lathe parting holder – design and applications
How the block works with a parting blade
Parting tool block SMBB 2526 turns the lathe tool post into a stable parting setup. Mount it once, then adjust the cutting reach by extending the SPB parting blade.
Prismatic slot for a 26 mm blade
Guides the SPB blade with a height of 26 mm along the entire 86 mm body length.
Upper jaw clamping
Hex socket screws press the jaw against the blade along its entire length, without localized stress.
Double-ended blade
The SPB blade has a pocket at both ends — when one wears out, turn it around in the slot.
✓Less vibration during deep cuts — longer support than in the tool post
✓Adjust the overhang without removing the block from the lathe
✓25 mm shank — quick-change and four-way tool posts
SMBB 2526 block dimensions
Dimensional drawing and dimension table
LENGTH L
86 mm
HEIGHT H
46.6 mm
WIDTH K
42 mm
BASE k
23 mm
| Dimension | Designation | Value |
|---|---|---|
| Shank height | H1 | 25 mm |
| Overall height | H | 46.6 mm |
| Base width | k | 23 mm |
| Overall width | K | 42 mm |
| Length | L | 86 mm |
SMBB series – five block sizes
Selecting a block for the tool post and blade
Sizes in the SMBB series
| Type | Shank | Blade | Length | Status |
|---|---|---|---|---|
| SMBB 2026 | 20 mm | 26 mm | 87 mm | |
| SMBB 2032 | 20 mm | 32 mm | 100 mm | |
| SMBB 2526 | 25 mm | 26 mm | 86 mm | THIS PRODUCT |
| SMBB 2532 | 25 mm | 32 mm | 110 mm | |
| SMBB 3232 | 32 mm | 32 mm | 110 mm |
The first two digits in the designation indicate the tool post shank height; the last two indicate the height of the blade held. Blocks 2026 and 2526 accept SPB x26 blades; blocks 2032, 2532, and 3232 accept SPB x32 blades.
Varel blades compatible with the SMBB 2526 block
The block accepts Varel SPB blades with a height of 26 mm and a length of 110 mm: SPB 226, SPB 326, SPB 426, and SPB 526. The first digit of the code indicates the cutting width in mm; the last two indicate the blade height. Each blade has a spring-clamping pocket for an SP insert at both ends.
| Blade | Cutting width | Insert | Body thickness A | Length L |
|---|---|---|---|---|
| SPB 226 | 2 mm | SP200 | 1.6 mm | 110 mm |
| SPB 326 | 3 mm | SP300 | 2.4 mm | 110 mm |
| SPB 426 | 4 mm | SP400 | 3.2 mm | 110 mm |
| SPB 526 | 5 mm | SP500 | 4.0 mm | 110 mm |
The blade body is thinner than the insert, so the sides of the blade do not rub against the groove walls. Cutting depth is limited by the blade height below the insert pocket — 21 mm for SPB x26 blades — and the radius of the bar being parted off must be smaller than this height.
Installing the blade in the block – three steps
From tool post to a ready-to-use setup
Installation step by step
1Seat the block
shank: 25 mm
2Insert the blade
blade: SPB x26
3Tighten the screws
wrench: hex
✓Set the overhang
as short as possible
After every change in workpiece diameter, adjust the blade overhang and check screw clamping.
How far should the blade extend?
Overhang ≈ D/2 + 2–3 mm allowance. For a Ø30 mm bar: 30 ÷ 2 + 3 = 18 mm — this much blade extending beyond the block jaw is enough to cut to the centerline. Every additional millimeter of overhang reduces rigidity.
Compatibility and working range
What fits the SMBB 2526 block
✓ Varel SPB 226, SPB 326, SPB 426, and SPB 526 blades — height 26 mm, SP inserts with a width of 2–5 mm
✓ Tool posts that accept a shank with a height of 25 mm
▲ Deep grooving — use a cycle with retraction to evacuate chips
✗ Blades with a height of 32 mm — choose an SMBB 2032, 2532, or 3232 block
Blade overhang and cooling
Set the minimum overhang that allows the workpiece to be parted off — excess overhang reduces rigidity and causes vibration. When parting through solid material, direct coolant into the cutting gap and reduce the feed before breakthrough.
The SMBB 2526 parting tool block is the foundation of a parting setup on an engine lathe with a 25 mm tool post. One body accommodates four Varel SPB blades with a height of 26 mm and cutting widths of 2–5 mm — change the cutting width by replacing the blade, not the entire holder. Replace the SP insert in the blade's spring-clamping pocket without removing the block from the tool post.
Frequently asked questions
The SMBB 2526 parting blade block accepts Varel SPB blades with a height of 26 mm and a length of 110 mm: SPB 226, SPB 326, SPB 426, and SPB 526. Select the cutting width by choosing the blade — from 2 to 5 mm, with SP200–SP500 inserts.
The block shank is 25 mm high and fits quick-change and four-way tool posts. For a 20 mm slot, choose SMBB 2026 or 2032; for a 32 mm slot, choose SMBB 3232.
The bar radius must not exceed the blade height below the insert pocket — 21 mm for SPB x26 blades — and the blade overhang should be set to approximately D/2 + 2–3 mm allowance. A shorter overhang produces a more even end face and less vibration.
Yes. Set the working direction with the blade: SPB has a pocket at both ends, so turn it around in the block slot. The block remains mounted in the tool post.
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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