# Boring Head Holder, QZST, Overall Length 2.9840 in, Inside Dia. 1/4 in, Bore Dia. 1/4 in, Shank Type - Machining Straight, Shank Dia. 22.00mm, For Use With Star Swiss Machine Models SR-20/SB-16/SB-20R/SR-10J/SR-20J/JN, Finish - Machining Black Oxide

**Manufacturer:** Micro 100  
**MPN:** `QZST-422L-SR20`

## Specifications

| Attribute | Value |
| --- | --- |
| Brand name | Micro 100 |
| Manufacturer name | Micro 100 |
| Manufacturer | Micro 100, Micro 100 Tool Corporation |
| CategoryId | 13099 |
| CategoryIdL1 | 8 |
| CategoryIdL2 | 7846 |
| CategoryIdL3 | 13099 |
| CategoryL1 | Tools & Machining |
| CategoryL2 | Workholding & Machine Tool Accessories |
| CategoryL3 | Milling & Drilling Toolholders |
| CategoryL4 | End Mill Holders |
| DimensionUnit | inch |
| GTIN | 728709167809 |
| GraingerSku | 18E398 |
| UPC | 728709167809 |
| UnitOfMeasure | EA |
| Weight | 0.68, 0.89 |
| WeightUnit | lbs |
| cali_prop65_orglabel | False |
| cali_prop65_whtlabel | False |
| countryOfOrigin | US |
| height | 1.63 |
| jsonUrlData | 924526ffbdad25e5923b |
| length | 2.38 |
| moq | 1 |
| MPN | QZST-422L-SR20 |
| multiple | 1 |
| qtyInStock | 0 |
| qtyInStockOverride | -2 |
| SKU | G8092551 |
| tierMinQty1 | 1 |
| tierPrice1 | 244.99 |
| url | https://www.zoro.com/micro-100-quick-change-swiss-holder-long-qzst-422l-sr20/i/G8092551/ |
| width | 3 |
| EAN | 728709167809 |
| Part Number | QZST-422L-SR20 |
| Model | QZST-422L-SR20 |
| Product Group | BISS |
| Bore Dia | 1/4 in |
| Overall Length | 2.9840 in |
| Shank Dia | 22.00mm |
| Holder Length | 1.6060 in |
| Inside Dia | 1/4 in |
| Item | Boring Head Holder |
| For Use With | Star Swiss Machine Models SR-20/SB-16/SB-20R/SR-10J/SR-20J/JN |
| Shank | .2500" |
| Style | Inch, 6.35 I.D. Holder |
| Series | QZST |
| Finish - Machining | Black Oxide |
| Shank Type - Machining | Straight |
| Measurement System | Fractional Inch |
| ASIN | B00QCKIECS |
| AdultProduct | False |
| Amount | 269.00 |
| Asin | B00QCKIECS |
| Autographed | False |
| Binding | Misc. |
| Brand | Micro 100 |
| Bullet_point | Designed for use with the .1875", .2500", and .3125" diameter shank quick change tools, Proprietary Micro-Quik quick change system maximizes productivity through reliable accuracy and locational repea |
| Case | 1 |

## Distributor availability

| Distributor | SKU | Price (USD) | Qty | Stock | MOQ |
| --- | --- | --- | --- | --- | --- |
| Zoro | G8092551 | 244.99 | 1 | None | 1 |
| Grainger | 18E398 |  |  | None | 1 |
| Grainger | 7DU07 |  |  | None | 1 |
| Raptor Supplies | AA8GBF | 445.666221 | 1 | None | 1 |
| Amazon | B00QCKIECS | 269.0 | 1 | None | 1 |
| simsupply.com | ZO-G8092551 | 290.02 | 1 | 9 | 1 |

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Structured data: `/python/html6/product/500/88000000/88371500/part_--QZST422LSR20---Micro100--a0b0b55fbb.json`  
Search API: https://www.dataalchemy.com/api/  
MCP server: https://www.dataalchemy.com/mcp