La norma ASME B18.31.2 riguarda tre tipi di tiranti riconosciuti come prodotti standard nazionali americani. TIRANTI TUTTO FILETTO: tiranti filettati per tutta la loro lunghezza; PRIGIONIERI con lunghezze filetto uguali su entrambe le estremità; PRIGIONIERI con diverse lunghezze di filettatura su ciascuna estremità.

Disegni dimensionali e diagrammi tecnici

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Dimensioni chiave e parametri tecnici

Dimensions in inches (1 inch=25.4 mm) sourceASME B18.31.2 2008 table 2 Clamping type studs

d Thread size

Nr. of threads x inch

B Nut end full thread length. min
inch mm UNC UNF L≤ 10 10< L≤ 16 L> 16
1/4
6.35 20 28 0.75 1 1.5
5/16
7.94 18 24 0.875 1.125 1.625
3/8
9.53 16 24 1 1.25 1.75
7/16
11.11 14 20 1.125 1.375 1.875
1/2
12.70 13 20 1.25 1.5 2
9/16
14.29 12 18 1.375 1.625 2.125
5/8
15.88 11 18 1.5 1.75 2.25
3/4
19.05 10 16 1.75 2 2.5
7/8
22.23 9 14 2 2.25 2.75
1
25.40 8 12 2.25 2.5 3
1-1/8 28.58 7 12 2.5 2.75 3.25
1-1/4 31.75 7 12 2.75 3 3.5
1-3/8 34.93 6 12 3 3.25 3.75
1-1/2 38.10 6 12 3.25 3.5 4
1-5/8 41.28 - - 3.5 3.75 4.25
1-3/4 44.45 5 - 3.75 4 4.5
1-7/8 47.63 - - 4 4.25 4.75
2 50.80 4.5 - 4.25 4.5 5
2-1/4 57.15 4.5 - 4.75 5 5.5
2-1/2 63.50 4 - 5.25 5.5 6
2-3/4 69.85 4 - 5.75 6 6.5
3 76.20 4 - - 6.5 7
3-1/4 82.55 4 - - 7 7.5
3-1/2 88.90 4 - - 7.5 8
3-3/4 95.25 4 - - 8 8.5
4 101.6 4 - - 8.5 9

Dimensions in inches (1 inch=25.4 mm) sourceASME B18.31.2 2008 table 3 Tap end studs (1.5D engagement)

d Thread size
Nr. of threads x inch

Bm Tap end full thread length.

nominal

B Nut end full thread length. min
inch mm UNC UNF L≤ 10 10< L≤ 16 L> 16
1/4
6.35 20 28 0.375 0.75 1 1.5
5/16
7.94 18 24 0.469 0.875 1.125 1.625
3/8
9.53 16 24 0.563 1 1.25 1.75
7/16
11.11 14 20 0.656 1.125 1.375 1.875
1/2
12.70 13 20 0.75 1.25 1.5 2
9/16
14.29 12 18 0.844 1.375 1.625 2.125
5/8
15.88 11 18 0.938 1.5 1.75 2.25
3/4
19.05 10 16 1.125 1.75 2 2.5
7/8
22.23 9 14 1.313 2 2.25 2.75
1
25.40 8 12 1.5 2.25 2.5 3
1-1/8 28.58 7 12 1.688 2.5 2.75 3.25
1-1/4 31.75 7 12 1.875 2.75 3 3.5
1-3/8 34.93 6 12 2.063 3 3.25 3.75
1-1/2 38.10 6 12 2.25 3.25 3.5 4
1-5/8 41.28 - - 2.438 3.5 3.75 4.25
1-3/4 44.45 5 - 2.625 3.75 4 4.5
1-7/8 47.63 - - 2.813 4 4.25 4.75
2 50.80 4.5 - 3 4.25 4.5 5
2-1/4 57.15 4.5 - 3.375 4.75 5 5.5
2-1/2 63.50 4 - 3.75 5.25 5.5 6
2-3/4 69.85 4 - 4.125 5.75 6 6.5
3 76.20 4 - 4.5 - 6.5 7
3-1/4 82.55 4 - 4.875 - 7 7.5
3-1/2 88.90 4 - 5.25 - 7.5 8
3-3/4 95.25 4 - 5.625 - 8 8.5
4 101.6 4 - 6 - 8.5 9