# Spec

**Manufacturer:** Spec  
**MPN:** `T31320`

The SPEC T31320 Music Wire Extension Spring is made from highly magnetic steel, meeting ASTM A228 standards for greater strength than stainless steel. It features full twist loop ends for secure fastening and a dry to the touch oil finish for added corrosion resistance. This spring has a 5.5 mm outer diameter, 0.8 mm wire size, and a 15 mm free length that extends to 21.4 mm. It can withstand a load capacity of 30.2 N and has a spring rate of 4.00 N/mm.

## Specifications

| Attribute | Value |
| --- | --- |
| Brand name | Spec |
| Manufacturer name | Spec |
| Manufacturer | Spec |
| DimensionUnit | inch |
| GraingerSku | 782AT4 |
| Extra Product Name | Spec |
| UPC | None |
| UnitOfMeasure | PK |
| Weight | 0.01 |
| WeightUnit | lbs |
| atoms | 2 |
| cali_prop65_orglabel | False |
| cali_prop65_whtlabel | False |
| countryOfOrigin | CN |
| extendedLead | 17 |
| extendedQty | -2 |
| height | 0.22 |
| jsonUrlData | 924526ffbdad25e5923b |
| length | 0.6 |
| moq | 1 |
| MPN | T31320 |
| multiple | 1 |
| qtyInStock | 0 |
| qtyInStockOverride | Drop Ship |
| SKU | G101795710 |
| tierMinQty1 | 1 |
| tierPrice1 | 9.46 |
| url | https://www.zoro.com/spec-metric-extension-spring-music-wire-pk2-t31320/i/G101795710/ |
| width | 0.22 |
| Type | High Precision |
| Material | Music Wire |
| Overall Length | 15 mm |
| Outside Dia | 5.5 mm |
| Wire Dia | 0.8 mm |
| Spring Rate (Lbs /In ) | 4 N/mm |
| End Type | Full Twist Loops |
| Finish | Oil |
| Meets/Exceeds | DIN-17223; JIS-G4314; AMS-5112 |
| Initial Tension (Lbs ) | 1.03 lb |
| Load (Lbs ) | 6.79 lb |
| Item | Metric Extension Spring |
| Country of Origin (subject to change) | China |

## Distributor availability

| Distributor | SKU | Price (USD) | Qty | Stock | MOQ |
| --- | --- | --- | --- | --- | --- |
| Zoro | G101795710 | 9.46 | 1 | None | 1 |
| Grainger | 782AT4 | 8.98 | 1 | None | 1 |

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