H13 Flange Bolt Disc Springs

H13 Tool Steel is a versatile, chromium-molybdenum alloy. Its characteristics include high toughness, resistance to thermal fatigue cracking, hardenability, and wear resistance. Help eliminate flange leakage with BelleFlex^® flange bolting. Leaks occur by bolt stretch, gasket creep, cycles of thermal change, etc. However, by maintaining load on bolted joints, leakage is greatly reduced, if not eliminated.

The load values listed in the table below are according to the calculated theoretical load curve based on the dimensions and material for each part number.

Part Number	Stud Size	OD	ID	THK	DISH	OAH	Spec Flat Load (lbf)	Torque (ft-lb)
FB1-30-H13	1/2″	1.012	0.53	0.12	0.013	0.133	4360	30
FB1-45-H13	1/2″	1.012	0.53	0.14	0.012	0.152	6391	45
FB1-60-H13	1/2″	1.012	0.53	0.159	0.011	0.17	8582	60
FB2-30-H13	5/8″	1.148	0.641	0.146	0.014	0.16	6895	60
FB2-45-H13	5/8″	1.148	0.641	0.171	0.013	0.184	10286	90
FB2-60-H13	5/8″	1.148	0.641	0.193	0.012	0.205	13652	120
FB3-30-H13	3/4″	1.369	0.761	0.179	0.016	0.195	10174	100
FB3-45-H13	3/4″	1.369	0.761	0.214	0.014	0.228	15212	150
FB3-60-H13	3/4″	1.369	0.761	0.241	0.013	0.254	20175	200
FB4-30-H13	7/8″	1.588	0.892	0.207	0.019	0.226	14008	160
FB4-45-H13	7/8″	1.588	0.892	0.246	0.017	0.263	21036	240
FB4-60-H13	7/8″	1.588	0.892	0.282	0.015	0.297	27960	320
FB5-30-H13	1″	1.808	1.021	0.228	0.024	0.252	18323	245
FB5-45-H13	1″	1.808	1.021	0.277	0.02	0.297	27381	368
FB5-60-H13	1″	1.808	1.021	0.328	0.016	0.344	36369	490
FB6-30-H13	1-1/8″	2.023	1.146	0.264	0.025	0.289	23731	355
FB6-45-H13	1-1/8″	2.023	1.146	0.321	0.021	0.342	35835	533
FB6-60-H13	1-1/8″	2.023	1.146	0.379	0.017	0.396	47746	710
FB7-30-H13	1-1/4″	2.308	1.272	0.296	0.03	0.326	30139	500
FB7-45-H13	1-1/4″	2.308	1.272	0.36	0.025	0.385	45184	750
FB7-60-H13	1-1/4″	2.308	1.272	0.413	0.022	0.435	60036	1000
FB8-30-H13	1-3/8″	2.468	1.401	0.333	0.029	0.362	37187	680
FB8-45-H13	1-3/8″	2.468	1.401	0.395	0.026	0.421	55645	1020
FB8-60-H13	1-3/8″	2.468	1.401	0.453	0.023	0.476	74249	1360
FB9-30-H13	1-1/2″	2.678	1.526	0.366	0.031	0.397	44978	800
FB9-45-H13	1-1/2″	2.678	1.526	0.439	0.027	0.466	66224	1200
FB9-60-H13	1-1/2″	2.678	1.526	0.509	0.023	0.532	89758	1600
FB10-30-H13	1-5/8″	2.951	1.648	0.396	0.036	0.432	53546	1100
FB10-45-H13	1-5/8″	2.951	1.648	0.482	0.03	0.512	80464	1650
FB10-60-H13	1-5/8″	2.951	1.648	0.549	0.027	0.576	107009	2200
FB11-30-H13	1-3/4″	3.168	1.776	0.429	0.038	0.467	62555	1500
FB11-45-H13	1-3/4″	3.168	1.776	0.52	0.032	0.552	93814	2250
FB11-60-H13	1-3/4″	3.168	1.776	0.598	0.028	0.626	124844	3000
FB12-30-H13	1-7/8″	3.391	1.901	0.464	0.04	0.504	72717	2000
FB12-45-H13	1-7/8″	3.391	1.901	0.56	0.034	0.594	108658	3000
FB12-60-H13	1-7/8″	3.391	1.901	0.592	0.032	0.624	120819	4000
FB13-30-H13	2″	3.599	2.026	0.501	0.041	0.542	83587	2200
FB13-45-H13	2″	3.599	2.026	0.593	0.037	0.63	125086	3300
FB13-60-H13	2″	3.599	2.026	0.638	0.033	0.671	138937	4400
FB14-30-H13	2-1/4″	4.039	2.282	0.557	0.048	0.605	107109	3180
FB14-45-H13	2-1/4″	4.039	2.282	0.677	0.04	0.717	160268	4770
FB14-60-H13	2-1/4″	4.039	2.282	0.734	0.035	0.769	178721	6360
FB15-30-H13	2-1/2″	4.482	2.529	0.626	0.052	0.678	133617	4400
FB15-45-H13	2-1/2″	4.482	2.529	0.757	0.044	0.801	199929	6600
FB15-60-H13	2-1/2″	4.482	2.529	0.81	0.04	0.85	222665	8800
FB16-30-H13	2-3/4″	4.919	2.777	0.695	0.056	0.751	163554	5920
FB16-45-H13	2-3/4″	4.919	2.777	0.849	0.046	0.895	244906	8880
FB16-60-H13	2-3/4″	4.919	2.777	0.892	0.044	0.936	271685	11840
FB17-30-H13	3″	5.359	3.027	0.755	0.062	0.817	195675	7720
FB17-45-H13	3″	5.359	3.027	0.928	0.05	0.978	293033	11580
FB17-60-H13	3″	5.359	3.027	0.996	0.045	1.041	326056	15440
FB18-60-H13	3-1/4″	5.397	3.293	1.039	0.044	1.083	385062	19990
FB19-60-H13	3-1/2″	6.13	3.525	1.196	0.046	1.242	448145	25090
FB20-60-H13	3-3/4″	6.665	3.818	1.275	0.052	1.327	517376	31020
FB21-60-H13	4″	7.13	4.05	1.5	0.058	1.558	814926	57950

^* Torque values for sizes 1-1/8″ and larger are based on the 8-pitch thread series for flanged piping.
† 50,000 psi bolt stress
†† 45,000 psi bolt stress