Accuracy Standards
Futaba inspection criteria for die set are compliant with "JIS B 5031 Die sets for press dies-Accuracy and measuring method." Since our die sets are manufactured in compliance with more accurate internal standards, even high precision die can deliver full performance.
Parallelism between upper and lower surfaces of punch holder and die holder
Long side length of nominal dimension (a×b) |
Up to 100 |
100 or more and up to 200 |
Standard |
0.008 |
0.008 per 100 |
Precision* |
0.004 |
0.004 per 100 |
Long side length of nominal dimension(a×b) |
More than 200 and up to 300 |
More than 300 and up to 600 |
More than 600 and up to 1000 |
Standard |
0.015 |
0.025 |
0.040 |
Precision* |
0.010 |
0.015 |
0.025 |
Squareness between post and lower surface of die holder
・ Press fit post (guide type BO, RO, WO, RT and WT)
Up to 0.02 per 100
・Removable post (other guide types than the above)
Up to 0.01 per 100
Parallelism after assembly
Long side length of nominal dimension (a×b) |
Up to 100 |
100 or more and up to 200 |
Standard |
0.012 |
0.012 per 100 |
Precision* |
0.008 |
0.006 per 100 |
Long side length of nominal dimension (a×b) |
More than 200 and up to 300 |
More than 300 and up to 600 |
More than 600 and up to 1000 |
Standard |
0.025 |
0.035 |
0.060 |
Precision* |
0.020 |
0.025 |
0.040 |
Squareness of shank to the upper surface of punch holder
Product type |
Stud shank |
Flange shank |
Tolerance |
Up to 0.01 per 50 |
Shank
・Diameter
-0.05 0
・Cylindricity
0.05
Squareness of reference plane (steel die set, aluminum alloy die set)
Long side length of holder (A×B) |
Up to 300 |
More than 300 and up to 600 |
More than 600 and up to 1000 |
Tolerance |
0.03 |
0.05 |
0.10 |
Deviation of reference plane of punch holder/die holder (steel die set, aluminum alloy die set)
Up to 0.05 per 300
Holder external dimension
±0.5 (steel die set, aluminum alloy die set)
Holder thickness
Long side length of holder (A×B) |
Up to 300 |
More than 300 and up to 600 |
More than 600 and up to 1000 |
Standard |
±0.20 |
±0.25 |
±0.30 |
Precision* |
±0.10 |
±0.15 |
±0.25 |
Holder surface roughness (arithmetic mean roughness Ra)
|
Reference plane |
Upper and lower planes |
Other plane |
Standard |
3.2 |
3.2 |
6.3 |
Precision* |
3.2 |
1.6 |
6.3 |
Post/bush hardness
59-64HRC (post is quenched by high frequency )
Post straightness
Length |
Up to 150 |
More than 150 and up to 250 |
More than 250 and up to 300 |
Tolerance |
1.5μm |
2μm |
3μm |
Circularity/cylindricity of post
・Circularity
2μm
・Cylindricity
3μm
Circularity/cylindricity of bush
Circularity
Bush inner diameter |
Tolerance |
19~30 |
2μm |
31~58 |
3μm |
60~70 |
3μm |
Cylindricity
Bush inner diameter |
Tolerance |
19~30 |
2μm |
31~58 |
3μm |
60~70 |
5μm |
Clearance of plain guide (Bush inner diameter) - (Post diameter)
Post diameter |
19~25 |
27~32 |
36~38 |
40~56 |
Clearance |
5±2μm |
8±2μm |
10±2μm |
12±2μm |
Preloaded amount of ball guide (Post diameter) + (Ball diameter) × 2 - (Bush inner diameter)
Post diameter |
19~25 |
27・28 |
31~36 |
37・38 |
40~56 |
Preloaded amount |
22±2μm |
24±2μm |
28±2μm |
31±2μm |
34±2μm |
* "Precision" is applied to the following products.
- Aluminum alloy die set
- BM/RM/WM/RK/WK/RR/HS/HY in US series and PS series of steel die set
In the case of the following products, "pecision" can be specified.
- BS/RS/WS/RY/WY in US series and PS series of steel die set.
"Standard" is applied to the other die sets.